Home

LGA/LCA/LHA WARNING

1. 2 Page 79 SEQUENCE OF OPERATION LGA LCAO0688 090 100 102 120 150 Power 1 Line voltage from unit disconnect energizes transform er T1 T1 provides 24VAC power to terminal strip TB34 TB34 provides 24VAC to the unit cooling heating and blower controls TB13 is also energized when unit disconnect switch closes TB13 provides line voltage to compressors crankcase heaters compressor contactors the blower motor contactor and condenser fan relay Blower Operation 3 4 The main control module receives a demand from ther mostat terminal G A55 energizes blower contactor K3 with 24 N O K3 1 closes energizing blower B3 Economizer Operation 5 The economizer control module A56 receives a demand and energizes exhaust fan relay K65 with 24 at 5096 outside air damper open adjustable N O K65 1 and N O K65 2 both close energizing ex haust fan motor B10 1st Stage Cooling compressor B1 T First stage cooling demand energizes Y1 and G in the thermostat G energizes blower 24 is routed through TB34 to the main control module 55 After A55 proves N C low pressure switch S87 freezestat S49 and N C high pressure switch S4 com pressor contactor K1 is energized N O contacts K1 1 close energizing compressor B1 low ambient switch S11 clos
2. AMP SETTING TESTI CONTROL BLUE DIAL RED TEST BUTTON 127 Push To Test BLUE RESET SCREW Shown in AUTO position as LOAD VOLTAGE OUT shipped from the factory Lift clear cover to adjust relay amp setting according to value given on the blower motor nameplate Prop er relay amp setting equals motor nameplate FLA X service factor of 1 15 X 95 Cover must also be lifted to adjust control mode from automatic reset to manual reset see detail above and to test the control Control must be in the manual reset mode to perform a test Use a pointed object to press the small red test button A yellow marker should appear in the trip indication window to the right of the amp setting control Press the blue reset screw to reset the relay The red STOP button opens the normally closed contacts which power the blower motor This button stops blower motor operation as long as it is pressed in FIGURE 9 Page 35 IMC BOARD INPUTS AND OUTPUTS SENSORS 15 111 112 113 COMPRESSOR SAFETY INPUTS BURNER THERMOSTAT INPUTS 2 TB1 connects to P110 Room thermostat connects to TB1 IMC AND ADD ON BOARD LOCATION AND OPERATION 55 1 Blower 99 1 Gas valve 1 Compressor 1 Reversing valve 1 Outdoor fan 1 Electric heat section A61 LHA
3. om ZL EZ Dems rem BEE o see BEE EHA 7 5 15 22 5 30 45 60KW ELECTRIC HEAT SECTION PARTS ARRANGEMENT HEATING ELEMENTS HE1 HE7 SECONDARY ELECTRIC HEAT LIMIT S20 ELECTRIC HEAT VESTIBULE CONTROL WIRE HARNESS PRIMARY ELECTRIC HEAT LIMIT FIGURE 25 ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT TERMINAL STRIP TB3 FUSE F3 FIRST STAGE ELECTRIC SECOND STAGE ELECTRIC FUSE F3 F3 1 HEAT CONTACTOR K15 HEAT CONTACTOR K16 F3 4 F3 3 FIGURE 26 Page 51 Electric Heat Data TABLE 6 0885 TTotal Unit with Power Exhaust Fan amp Electric Heat Minimum PT 75 11259 69 23800 208 230v 16 08 1 440 69 21 500 460v 16109 1 460 69 23600 23 24 578v 1610 MS 1 575 69 25800 1 1 220 126 43 000
4. PLUG SENSOR INPUT PLUG ECONOMIZER OUTPUT PLUG COMPRESSOR 2 JACK HEAT PUMP CONTROL JACK HEAT PUMP INPUT 06 810 EXHAUST FAN MOTOR SWITCH LIMIT HI PRESS COMP SWITCH DEFROST COMP SWITCH LIMIT HI PRESS COMP 2 SWITCH DEFROST COMP 2 SWITCH LOW PRESS LOW AMB KIT OVERLOAD RELAY BLWR MOTOR SWITCH DEFROST TERMINATION DENOTES COMPONENTS IF ANY WIRE IN MUST REPLACED AND INSULATION NOTE FOR USE WI HIS HICKNESS DISCONNECT ALL POWER BEFORE SERVICING H COPPER CONDUCTORS ONLY APPLIANCE IS REPLACED H WIRE OF LIKE SIZE RATING IT REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE ANTICIPATION SETTING 0 1 AMP WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY THERMOSTAT HEAT OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES EXHAUST FAN LINE VOLTAGE FIELD INSTALLED NEC CEC CLASS NOTE ALL REMAINING WIRES FACTORY INSTALLED Page 85 SWITCH DISCONNECT SWITCH FREEZESTAT COMP SWITCH FREEZESTAT COMP 2 SWITCH LOW PRESS LOW AMB COMP 2 SWITCH LOW PRESS COMP SWITCH LOW PRESS COMP 2 SWITCH DEFROST PRESS COMP 2 TRANSF ORMER CONTROL TERMINAL STRIP POWER DISTRIB TERMINAL STRIP TRANS TI IOIOIOIOIOo IOoo oi r WIRING DIAGRAM 5 04 HEAT PU
5. Croat 12 Ibs O oz 5 44 kg Humiditrol Units 14 Ibs 8 oz 6 58 kg arge ben Circuit 2 12 Ibs 0 oz 5 44 kg Humiditrol Units 14 Ibs 0 oz 6 35 kg Rated in accordance with ARI Standard 340 360 and certified to ARI 95 F C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering evaporator air minimum external duct static pressure TIntegrated Part Load Value rated at 80 F 27 C outdoor air temperature eSound Rating Number rated in accordance with test conditions included in ARI Standard 270 NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction Model No LGA150 Input low Btuh kW 84 500 24 8 15250447 500 44 7 Two Stage Heating Capacity Output low Btuh kW 67 500 19 8 122 000 35 8 Natural or Input High Btuh kW 130 000 38 1 235 000 68 9 irs d Output High Btuh kW 104 000 30 5 188 000 55 1 at oea Leve A GAJC GA Thermal Efficiency 80 0 80 0 Gas Supply n o Connections in 22 22 BB Recommended Gas Bing o s Supply Pressure wc in kPa FL PG Propane 11 a 7 For LPG Propane units a field conversion kit is required and must be ordered extra Page 5 SPECIFICATIONS LHA Model No ________ LHA088S Effiiency Type Tye To St
6. HIGH PRESSURE SWITCH S4 CRANKCASE HEATERS FIGURE 12 Page 38 LHAO090 102 120 150 PLUMBING COMPONENTS EFROST TEMPERATURE SWITCH S6 DEFROST TEMPERATURE SWITCH S9 H H Re 15 STAGE LOWER HALF COIL COMPRESSOR 1ST STAGE 22 ACCUMULATOR EARLY PRODUCTION COMPRESSOR 2ND STAGE 090 102 120 150 COMPRESSOR DETAIL LOW AMBIENT SWITCH 511 LOW AMBIENT SWITCH S84 REVERSING VALVE L1L2 HIGH PRESSURE SWITCH 54 HIGH PRESSURE SWITCH 57 LOW PRESSURE SWITCH S88 ACCUMULATOR EARLY PRODUCTION FIGURE 13 Page 39 B Cooling Components Components described in this section may not be shared by all LGA LCA LHA model units See wiring diagram for more specific component listing LGA LCA LHA units use independent cooling circuits con sisting of separate compressors condenser coils and evap orator coils See figures 11 through 13 Units are equipped with one or two draw through type condenser fans All units are equipped with belt drive blowers which draw air across the evaporator during unit operation Cooling may be supplemented by a factory or field installed economizer The evaporator is slab type and uses a thermostatic expansion valve as the primary expan sion device Each evaporator is also equipped with en
7. Expansion device type Port Thermostatic Expansion Valve removeable power head Net face area ft m _____ 2232700 Condenser Coil Tube diameter mm 8 of rows 3 8 9 5 2 Fins per inch m ____________ 20 87 Diameter mm amp ofblades_ 2 24 610 3 80008775 Condenser Motorhorsepower W oo 2 1 8 249 Motorem JD ToalMotorwats 70 21 Fitters lypeoffiter Disposable commercial grade pleated fumished no and size in mm 00 18 24 2 457 6 0 51 Electrical characteristics 208 230v 460v 575v 60 hertz 3 phase Using total air volume and system static pressure requirements determine from blower performance tables rpm motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Model No E LCA LGA150S Gross Cooling Capacity Btuh KM 1 Cooling Capacity Btuh kW Tr M45000 25 000 42 5 Net Cooling Capacity Btuh KW 138 000 40 4 Total Unt Power WW cS Ratings EE Load Value O eSound Rating Number d
8. 2 MOTOR EXHAUST FAN CAPACITOR OUTDOOR CAPACITOR OUTDOOR FAN 2 CAPACITOR EXHAUST FAN CIRCUIT BREAKER TRANS TI HEATER COMPRESSOR HEATER COMPRESSOR 2 JACK GFI RECEPTACLE JACK EXHAUST FAN JACK EXHAUST FAN JACK IEST HEAT JACK TEST COOL JACK QUTDOOR FAN JACK OUTDOOR 2 JACK BLOWER DECK JACK GAS OUTPUT JACK COOLING SENSOR INPUT JACK BLOWER amp COOL CONTROL JACK SENSOR INPUT JACK ECONOMIZER OUTPUT JACK HEAT PUMP CONTROL JACK HEAT PUMP INPUT JACK BIO EXHAUST FAN MOTOR CONTACTOR COMPRESSOR CONTACTOR COMPRESSOR 2 CONTACTOR BLOWER RELAY OUTDOOR FAN RELAY LOW AMBIENT KIT RELAY EXHAUST FAN RELAY OUTDOOR FAN 2 RELAY LOW AMBIENT KIT COMP 2 VALVE REVERSING VALVE REVERSING 2 PLUG EXHAUST FAN COMPT PLUG EXHAUST FAN PLUG TEST HEAT PLUG TEST COOL PLUG QUTDOOR FAN 24 COMMON BL UG OUTDOOR FAN 2 PLUG BLOWER DECK PLUG GAS OUTPUT PLUG COOLING SENSOR DESCRIPTION COMPONENT PLUG BLWR amp COOL CONT LOO L3 BE 72 N 9 N 1 EQUIP GROUND 120 1 60 GROUND NOTE USE COPPER CONDUCTORS ONLY S42 USED ON M VOLTAGE UNITS AND UNITS WITH HIGH EFFICIENCY MOTORS
9. 100 15 i 208230 1 240 150 51 200 T 1611 1 440 126 43 000 460v 16112 31 Ibs 14 kg 5 1 800 152 51 200 100 22 5 208 230v 32L95 12 440 18 9 64 500 460v 32196 12 460 20 7 70 700 575v 32197 t2 460 20 7 70 700 41 600 225 76800 33 34 100 30 103 107 208 230v 16L14 460v 161 15 51 53 38 Ibs 17 01 12 1 550 252 86 000 43 12 600 30 0 102 400 EHA100 45 148 152 208 230v nem 440 378 129 000 460v 161 18 16119 60 450 53 800 NOTE H indicates high efficiency units S indicates standard efficiency units TRefer to National or Canadian Electrical Code manual to determine wire fuse and dis connect size requirements Use wires suitable for at least 167 F 75 be used with two stage control NOTE Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in unit with field installed heaters Also requires LTB2 Terminal Block 38 Ibs 17 kg 45 kW TABLE 7 LCA088H tTotal Unit with Power Exhaust i Fan amp Electric Electric Heat Ho MIn Model No of input Output Cicult Ai 1 ired amp Net Weight Steps p ircuit Ampacity 2 hp 3 hp 1 5 kW 2 2 kW T mo 75 EHA100 7 5 208 230v 16L08 460v 16L09 575v 16L10
10. p pz e ot m me ms e me 9 9 Wrens 7 5 seme TEE meme 3x Eee TT Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus and minus 10 of line voltage NOTE Where current does not exceed 100 amps HACR type circuit breaker may be used in place of fuse U S only Page 23 7 5 AND 8 5 TON ELECTRICAL DATA 208 230V 090 460V 575V 208 230V LHA102H 460V 575V Model No Line voltage data 60 Hz 3 phase Compressors Number of Compressors Rated load amps each total Locked rotor amps each total Outdoor Number of Motors Fan Motors Full load amps each total Locked rotor amps each total Indoor Motor Output hp Blower Motor kw Full load amps Locked rotor amps 2 12 4 24 8 88 176 2 6 4 12 8 44 88 2 1 3 2 6 2 4 4 8 2 4 8 9 6 34 68 2 1 0 2 0 1 9 3 8 5 37 6 1 2 14 7 29 4 91 182 2 74 14 2 50 100 2 5 1 10 2 37 74 2 24 4 8 47 9 4 2 1 3 2 6 24 4 8 2 13 5 1 5 22 37 7 5 1066 16 7 46 9 66 105 2
11. 2 LOW PRESS CUMP 1 LOW PRESS RMER CONTROL TERMINAL STRIP POWER DISTRIB TERMINAL STRIP FIVE UNIT ADDER TERMINAL STRIP TRANS 11 MP 2 Leg Lea oto 13 6 548 DENOTES OPTIONAL COMPONENTS 1 d 56 EQUIP Aa GROUND hah J98 d EXHAUST IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT FAN MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING AND INSULATION THICKNESS LINE VOLTAGE FIELD INSTALLED NEC CEC CLASS 1 NOTE ALL REMAINING WIRES FACTORY INSTALLED DISCONNECT ALL POWER BEFORE SERVICING THERMOSTAT HEAT ANTICIPATION SETTING 0 1 AMP WIRING DIAGRAM 7 03 WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY DR DEATH UNIT MUST BE GRDUNDED IN COMBINATIUN PACKAGE D RLILUF N 120 1 60 ACCORDANCE WITH NATIONAL AND LOCAL CODES 72 NOTE FOR USE WITH COPPER CONDUCTORS ONLY LCA LGA 090 102 120H G J M Y REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT d 2 IM GROUND AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE LCC LGC 090 102 120 150S G J M Y NOTE USE COPPER USED ON VOLTAGE UNITS AND UNITS WITH _ CONDUCTORS ONLY HIGH EFFICIENCY MOTORS HEAT CUUL SECTI BS Supersedes Form No New Form No 534 358 234 824 004 Litho U S A
12. 088 100 090 102 120 150 090H 102H 088 100 120 150 088 100 120 150 120H 150S cfm L s Wd Pa d Pa Wd Pa a Pa jin wg in wg et Pa HA Pa 2000 945 06 15 0 13 32 03 7 2200 140 07 17 38 04 10 2250 1060 06 15 10 25 01 2 035 9 2400 1135 09 22 40 05 12 2500 1180 08 20 12 30 01 2 04 10 2600 1230 10 25 42 05 12 2750 1325 09 22 14 35 01 2 06 15 045 11 2800 1300 11 27 46 3000 1420 12 30 10 25 16 40 50 02 5 06 15 05 12 3200 1510 14 35 60 07 17 3250 1535 11 27 19 47 02 5 06 15 3400 1605 15 37 65 08 20 3500 1650 13 32 21 52 03 7 07 17 3600 1700 75 09 22 3750 1770 14 35 23 57 03 7 3800 1795 82 10 25 4000 1890 16 40 26 65 87 04 10 11 27 4250 2005 17 42 28 70 04 10 4500 2125 18 45 531 77 05 12 10 25 4750 2240 20 50 33 82 05 12 514 27 5000 2360 22 55 136 90 06 15 5250 2475 24 60 139 97 06 15 5500 2595 26 65 42 104 07 17 5750 2715 28 70 45 112 07 17 6000 2830 30 75 48 119 08 20 CEILING DIFFUS
13. Page 81 SEQUENCE OF OPERATION LGAO88 090 100 102 120 150 First Stage Heat 1 Heating demand initiates at W1 in the thermostat 2 24VAC is routed through TB34 to the main control mod ule A55 After A55 proves N C primary limit S21 the combustion air blower relay K13 is energized 3 N O K13 1 contacts close allowing line voltage to ener gize combustion air blower B6 4 After the combustion air blower B6 has reached full speed the combustion air proving switch 518 contacts close The A55 routes 24VAC through N C burner flame rollout switch S47 and the closed contacts of combustion air proving switch 518 to energize the igni tion module A3 5 After a 30 second delay A3 energizes the ignitor and W1 terminal low fire of gas GV1 Second Stage Heat 6 With first stage heat operating an additional heating demand initiates W2 in the thermostat 7 A second stage heating demand is received by A55 control module 8 55 energizes W2 terminal high fire of gas GV1 End of Second Stage Heat 9 Heating demand is satisfied Terminal W2 high fire is de energized 10 Terminal W2 of GV1 is de energized by A55 control module End of First Stage Heat 11 Heating demand is satisfied Terminal W1 low fire is de energized 12 Ignition A3 is de energized by control module A55 in turn de energizing terminal W1 of GV1 Combustion air blower relay K13 is also de energized Optional Low Amb
14. UNIT INFORMATION 1 7 5 18 5 1 10 12 5 26 3 29 8 35 2 44 kW Corp 9901 11 Revised 08 2007 Supersedes Corp 9803 L4 LENNOX Service Literature LGA LCA LHA SERIES The LGA LHA 7 5 8 5 10 and 12 5 ton 26 3 29 8 35 2 and 44 kW units are configure to order units CTO with a wide selection of factory installed options The LGA088 100 7 5 and 8 5 ton gas electric rooftop units are available in 125 000 Btuh or 180 000 36 6 kW or 52 74 heating inputs and share the same cabinet size with one condenser fan The LGA090 102 120 and 150 7 5 8 5 10 and 12 5 ton gas electric packaged rooftop units are available in 130 000 Btuh 180 000 Btuh or 240 000 Btuh 38 1 kW 52 7KW 70 3 kW heating inputs and share a larger cabinet size with two condenser fans Gas heat sections are designed with Lennox aluminized or optional stainless steel tube heat exchangers The LCAO088 through 150 cooling packaged rooftop units are equipped with the same cooling sections as the LGA088 through 150 units Optional electric heat is facto ry or field installed in LCA units The LGA LCAO90H 102H and 120H units are also de signed for optional R 410A refrigerant Operating pres sures and pressure switch settings are significantly higher than R 22 charged units Service equipment must be rated for R 410A WARNING Refrigerant can be harmful if it is inhaled Refrigerant m
15. 34 When L1 energizes N C K58 1 contacts open de ener gizing outdoor fan relay K10 followed by outdoor fan B4 When L2 energizes N C K118 1 contacts open de ener gizing outdoor fan relay K68 followed by outdoor fan B5 35 Defrost terminates when the pressure switch for the circuit 546 or 5104 opens or when 15 minutes has elapse The defrost cycle is not terminated when thermostat demand ends Page 86 ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT 24V POWER os 10 pcc 24V COMMON DESCRIPTION PUE ALARM OBITED KEY COMPONENT COMPONENT 0 4 BY INSTALLER A2 SENSOR ELECTRONIC IPLUG SENSORS CONTROL ATT DE TECTOR SHOKE erem PLUG THERMOSTAT INPUT 442 MONT TOR PHASE PROTECTION 4 18 000 ING SENSOR INPUT n THERMOSTAT HOOKUP FOR ASS pris SELECTABLE OPTION 93 ECTO 56 ONOM ON MI 5 OR BETTER IMC BOARD SNCH A64 DETECTOR SMOKE SUPPLY AIR TO PROVIDE THREE COMPRESSOR STAGES 6 WAC UN us EEN EI PLUG JUMPER BLOWER PROVING REQUIRES 3 HEAT 3 COOL THERMOSTAT HACK 2 RETURN AIR SENSOR IE PLUG BLOWER OVERRIDES AND K27 RELAY DISCH AIR SENSOR S27 AND S52 ARE OPTIONAL SE SENSOR ABS DISCHARGE Dr REMOVE JUMPER WHEN OCCUPIED UNOCCUPIED EN AIR OPERATION IS DESIRED UNIT REMAINS IN Nes 355 FA
16. Main Control Module Transformer A55 Fan Relay K68 C2 Terminal Strip TB1 Terminal Strip TB34 Compressor Contactors Terminal Stri Overload Relay K1 and K2 TB13 Blower Contactor K3 S42 Some Motors FIGURE 6 Page 32 I UNIT COMPONENTS ELECTROSTATIC DISCHARGE ESD Precautions and Procedures A CAUTION Electrostatic discharge affect electronic components Take precautions during unit instal lation and service to protect the electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the unit the control and the technician at the same electrostatic potential Neutralize electro static charge by touching hand and all tools on an unpainted unit surface before performing any service procedure LGA LCA LHA 7 5 8 5 10 and 12 5 ton 26 3 35 2 and 44 kW units are configure to order units CTO The LGA LCA LHA unit parts arrangement are shown in figures 1 through 4 All L1 L2 and L3 wiring is color coded 11 is red L2 is yel low and L3 is blue See wiring diagrams in the back of this m
17. 17 N O contactor K1 1 closes energizing compressor B1 18 24VAC from the main control module A55 is routed through N C low ambient contact K58 1 to energize out door fan contactor K10 19 N O contacts K10 1 close energizing outdoor fan B4 and N C contacts K10 2 open de energizing compressor crankcase heater HR1 Second Stage Heat electric heat 20 Second stage heat demand energizes W2 in the thermo stat 21 See sequence of operation for electric heat Defrost Mode 22 During heating operation when outdoor coil drops to 35 4 the defrost thermostat S6 closes initiating defrost after minimum run time of 30 60 or 90 minutes 23 When defrost begins the reversing valve 11 is energized Supplemental electric heat is energized 24 When L1 energizes N C K58 1 contacts open de ener gizing outdoor fan relay K10 followed by outdoor fan 25 Defrost terminates when pressure switch S46 opens or when15 minutes has elapse The defrost cycle is not ter minated when thermostat demand ends Page 84 LHAO90 102 120 150 UNIT WIRING SCHEMATIC 24V POWER DESCRIPTION COMPONENT PANEL MAIN PANEL ECONOMIZER PANEL HEAT PUMP COMPRESSOR COMPRESSOR 2 460V OR 575V TRANSF ORMER 220 240 50 1 N 380 420 RANSF ORME MOTOR BLOWER MOTOR OUTDOOR FAN
18. E M Line voltage data 60 Hz 5 phase 20872501 Efficiency type Standard S High Standard S High H Standard S High H Compressors Rated load amps each total 12 2 24 4 12 4 24 9 7 1 14 1 6 4 12 8 5 8 11 5 5 0 10 2 Locked rotor amps each total 90 180 88 176 46 92 44 88 37 74 34 68 Outdoor Tetange 030 15 15 2 12 Fan Motor Locked rotor amps 3 0 7 9 7 9 Em Pe 2 7 Blower 208 15 22 15 Motor arpe terta terta Locked rotor amps 469 Rec max fuse With Exhaust Fan 50 size amps Tess ExhaustFan 50 Minimum Wah Exhaust Fan 4 _ 38 No W 1 1 3 249 oue e Exhaust Fan Locked rotor amps Service Outlet 2 115 volt GFCI amp rating 15 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus and minus 10 of line volage NOTE Where current does not exceed 100 amps HACR type circuit breaker may be used in place of fuse U S only Model No LCA LGA100S 0885 e _ _ Line voltage data 60 Hz 3 phase 208 230v 208 230v 5 5v Ef
19. Heat Pump A56 Compressor 2 2 Outdoor fans 1 Reversing valve Optional 57 Second compressor 1 Outdoor fan and or Power Exhaust Fan liv e Economizer LCA LGA L FIGURE 10 Page 36 088 8 100 COMPRESSOR DETAIL LOW AMBIENT SWITCH S84 S11 LOW PRESSURE SWITCH S87 HIGH PRESSURE SWITCH LOW PRESSURE 54 SWITCH S88 COMPRESSOR 15 STAGE HIGH PRESSURE CRANKCASE SWITCH HEATER S7 COMPRESSOR ma 2ND STAGE SERVICE VALVE DISCHARGE LINE OPTIONAL LHA088 COMPRESSOR DETAIL LOW AMBIENT SWITCH DEFROST PRESSURE SWITCH S11 546 a HIGH PRESSURE SWITCH 84 LOW PRESSURE SWITCH S87 d COMPRESSOR HIGH TEMPERATURE LIMIT SWITCH 55 REVERSING VALVE CRANKCASE HEATER ACCUMULATOR FIGURE 11 Page 37 LGA LCA PLUMBING COMPONENTS LGA102 amp 120 Standard Efficiency Shown LOW AMBIENT SWITCH S11 LOW PRESSURE SWITCH S88 2ND STAGE UPPER HALF COIL COMPRESSOR HIGH PRESSURE 1ST STAGE 87 LOW PRESSURE HIGH PRESSURE COMPRESSOR SWITCH S87 SWITCH S4 2ND STAGE 090 102 120H amp 150H High Efficiency 1505 Standard Efficiency Shown LOW PRESSURE SWITCH S88 LOW PRESSURE SWITCH S87 HIGH PRESSURE SWITCH S7
20. 19 105 F 303 84 81 115 333 85 337 83 TABLE 31 LCA LGA120H NORMAL OPERATING PRESSURES CIRCUITA CIRCUIT Coil Discharge Suction Discharge Suction Entering 210 25 210 25 Air Temp psig psig psig 75 F 1 197 1 276 2087 2 75 4 85 227 417 08 211 238 4 95 F 258 80 264 79 105 288 82 205 82 84 1152 320 84 32 TABLE 32 LCA LGA120H with Humiditrol Outdoor CIRCUIT 1 CIRCUIT 2 Dis 10 Suct 5 Dis 10 Suc 5 Air Temp psig psig psig 65 182 78 172 74 75 205 77 203 75 85 F 233 77 233 77 95 F 264 79 264 79 105 F 298 80 295 82 115 339 83 326 84 33 LGA LCA120H R 410A Outdoor CIRCUIT 1 CIRCUIT 2 Coil En edna 5 Dis 10 Air Temp i psig TABLE 34 LGA LCA120H R 410A amp Humiditrol CIRCUIT 1 CIRCUIT 2 Outdoor Coil En tering ap Dis 10 psig TABLE 35 1505 NORMAL OPERATING PRESSURES Discharge Suction Discharge Suction Entering 10 5 10 Air Temp psig psig psig psig TABLE 36 LHA150S NORMAL OPERATING PRESSURES CIRCUIT 1 CIRCUIT 2 te Air Temp psig psig psig eer mo ser zw me Leer ze 29 wer ze ze 115 F 295 84 300 84 TABLE 37 1505 3 units NORMAL OPERATING PRESSURES Outdoor
21. Nominal motor output 2 hp 1 5 KW Blower and 3 hp 2 2 kW Drive 5 hp 3 7 kW Selection Maximum usable output 2 3 hp 1 7 kW US Only 3 45 hp 2 6 kW 5 75 hp 4 3 kW Motor Drive kit 2 hp kit 1 680 925 rpm kit 3 895 1120 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 46 1110 1395 rpm 5 hp kit 4 895 1120 rpm kit 46 1110 1395 rpm 1 15 x 15 881 x 381 Filters Type of filter Number and size in mm Electrical characteristics Disposable pleated MERV 7 standard or MERV 11 optional 4 18 x 24 x 2 457 x 610 x 51 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction 1 Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 wb entering evaporator air minimum external duct static pressure 2 Integrated Part Load Value rated at 80 F 27 C outdoor air temperature 3 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox
22. energizes condenser fan motors B4 and B5 response to Y1 demand In all LHAO90 150 units K10 ener gizes condenser fan B4 in response to Y1 demand and K68 energizes B5 in response to Y2 demand 10 Combustion Air Inducer Relay K13 LGA units Combustion air inducer relay K13 used in all units is DPDT relay with a 24VAC coil K13 is energized by the main control module A55 after a first stage heating demand from the thermostat K13 remains energized throughout the heat ing demand When energized K13 N O contacts close to energize the combustion air inducer and begin first stage heat Prove switch 518 located in the gas heat compart ment closes as combustion air static pressure falls to prove combustion air inducer operation When 518 closes the ignition control and gas valve is energized to begin first stage heat Page 33 11 Low Ambient Bypass Fan Relay K58 and K118 LHA units Low ambient bypass relay K58 and K118 are N C DPDT re lays with a 24VAC coil K58 is wired in parallel with the com pressor reversing valve L1 and K118 is wired in parallel with compressor reversing valve L2 Both are energized by A55 When 11 is energized stage one in the cooling cycle K58 is also energized opening K58 1 Therefore K58 1 is always closed during heating demand bypassing S11 This allows the fan to operate during heating demand and to cycle dur ing cooling demand When L2 is energized stage two in the cooli
23. 1 31 Ibs 14 kg 1 36 600 13000 1 1 1 2700 1 1 1 100 15 208 230 161 11 460v 16112 47 100 TURD 51200 71180115015 57700 64 500 70 700 208 230v 15800 295 54500 460v 321 96 70 700 575v 32197 76 800 38 Ibs 17 kg 61 500 70 700 712 600 225 76800 12 51200 EHA100 22 5 EHA100 30 93 900 103 107 208 230v 102 400 16514 86 000 460V 16115 93 900 51 53 575v 16L16 F2 480 30 0 102 400 38 Ibs 17 kg 5600 55500 32 89 732 206 358 15 300 32 220 378 729 000 enarooas 12 290 81314100 208 230v 153 600 20 375 728 000 16L17 460v 6118 32 460 41 3 41 000 575v 16L19 480 45 0 153 600 42 Ibs 19 RES 732 550 378 129000 NOTE H indicates high efficiency units S indicates standard efficiency units TRefer to National or Canadian Electrical Code manual to determine wire fuse and dis connect size requirements Use wires suitable for at least 167 F 75 be used with two stage control NOTE Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in unit with field installed heaters Also requires LTB2 Terminal Block Page 52 TABLE 8 LCA100S 1Total Unit with Power Exhaust i Fan amp Electric Electric Heat M
24. 2 Outdoor Coil Fins per inch m 20 787 4 Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head Diameter in mm amp No of blades 24 610 3 Total Air volume cfm L s 5300 2501 Outdoor Motor h W 1 2 373 wor mon 57 Dees 1075 Filters Type of filter Disposable Commercial Grade Pleated furnished No and size in mm 4 18 x 20 x 2 457 x 508 x 51 Electrical characteristics 208 230v 460v or 575v 60 hertz 3 phase ilRated in accordance with ARI Standard 210 240 and certified to ARI Cooling Ratings 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering indoor coil air High Temperature Heating Ratings 47 F 8 C db 43 F 6 C wb outdoor air temperature and 70 F 21 C entering indoor coil air Low Temperature Heating Ratings 17 F 8 C db 15 F 9 C wb outdoor air temperature and 70 F 21 C entering indoor coil air 2 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 3 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure
25. on unit is moved to block off down flow retum air opening for horizontal applications ilHorizontal Gravity Exhaust Dampers Aluminum blade dampers prevent blow back and outdoor air in filtration during off cycle field installed in return air duct bird screen and hood furnished Net Weight Indoor Air Quality Sensor Monitors levels reports to Integrated Modular Control IMC board 93J69 which adjusts economizer dampers as needed MC Sofware and Manua Ony EE PCmtraeKOny RE EE i Required if mixed air temperature is between 30 and 45 F 1 and 7 2 Not available for LCA models with field installed electric heat LCA 208 230v models with 30 kW or 45kW electric heat LHA 208 230v models with 15 kW 30 kW or 45 kW electric heat or for LHA 460v models with 45 kW electric heat LAGEDH03 15 30 Ibs 14 kg Page 9 OPTIONAL FIELD INSTALLED ACCESSORIES LGA LCA Item Catalog 090 102 120 150 No COOLING SYSTEM Condensate Drain Trap Copper LTACDKC09 36 76M19 9 9 9 PVC LTACDKPO9 36 76 18 e 9 9 e Corrosion Protection Factory Efficiency Standard Factory 9 High Factory Refrigerant Type R 22 Factory R 410A Factory Service Valves not for Humiditrol Units Factory 8
26. 10 LHAO88S TTotal Unit with Power Exhaust Fan amp Electric Heat Minimum Circuit Ampacity Electric Heat Model No amp Net Weight 220 6 3 230 6 9 240 7 5 440 6 9 460 6 9 480 7 5 550 6 3 575 6 9 600 7 5 208 11 3 220 12 6 230 13 8 240 15 0 440 12 6 460 13 8 480 15 0 550 12 6 575 13 8 600 15 0 208 16 9 220 18 9 230 20 7 240 22 5 440 18 9 460 20 7 480 22 5 550 18 9 575 20 7 600 22 5 208 22 5 220 25 2 230 27 5 440 25 2 460 27 5 93 900 480 30 0 102 400 550 25 2 86 000 575 27 5 93 900 55 600 30 0 102 400 208 33 8 115 300 220 37 8 129 000 230 41 3 141 000 185 440 37 8 129 000 460 41 3 141 000 480 45 0 153 600 550 37 8 129 000 575 41 3 141 000 12 600 45 0 153 600 NOTE H indicates high efficiency units S indicates standard efficiency units TRefer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 May be used with two stage control NOTE Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in unit with field installed heaters Also requires LTB2 Terminal Block 100 7 5 208 230 16108 460v 16109 575 16110 31 Ibs 14 kg EHA100 15 208 230v 16L11 460v 16L12 575v 16L13 31 Ibs 14 kg EHA100 22 5 208 230v 32L95 460v 32L96 575v 32197 38 Ibs
27. 22 3 7 Full load amps 7 5 7 5 10 6 16 7 3 4 48 7 6 2 7 39 6 1 Locked rotor amps 46 9 46 9 66 105 20 4 26 8 45 6 16 2 23 4 36 6 1 Maximum Overcurrent With Exhaust Fan 70 80 80 35 35 40 25 30 30 Protection amps Less Exhaust Fan 70 70 80 35 35 35 25 25 30 2 Minimum Circuit With Exhaust Fan 57 62 68 28 29 32 23 24 26 Ampacity Less Exhaust Fan 55 59 65 27 28 31 22 23 25 Number W 1 1 3 249 1 1 3 249 1 1 3 249 1 1 3 249 1 1 3 249 1 1 3 249 xhaust Fan Full load amps 24 1 3 1 0 24 1 3 1 0 Locked rotor amps 4 7 24 1 9 4 7 24 1 9 Service Outlet 115 volt amp rating 15 15 15 NOTE Extremes of operating range are plus and minus 109 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 24 ELECTRICAL DATA 12 5 TON Model No LHA150S 3 Line voltage data 60 Hz 3 phase 208 230V 460V 575 Compressors Number of Compressors 2 2 2 Rated load amps each total 19 6 39 2 9 5 19 0 7 8 15 0 Locked rotor amps each total 156 312 75 150 54 108 Outdoor Number of Motors 2 2 2 Fan Motors Full load amps each total 3 0 6 0 13 2 6 1 0 2 0 Locked rotor amps each total 6 0 12 0 2 4 4 8 1 9 3 8 Indoor Motor Out
28. 250 1245 270 1300 295 1355 3 25 1410 3 50 1460 3 80 1605 127 1 38 1 53 1 68 1 87 2 01 2 20 2 42 2 61 2 83 3600 995 195 1055 215 1115 235 1170 255 1225 280 1280 3 05 1335 330 1385 3 55 1440 3 85 1490 415 1700 1 5 1 60 1 75 1 90 2 09 2 28 2 46 2 65 2 87 3 10 3800 1045 230 1100 245 1160 270 1210 290 1265 3 15 1320 340 1370 365 1420 3 95 1470 4 25 1515 450 1795 172 1 83 2 01 2 16 2 35 2 54 2 72 2 95 3 17 3 36 4000 1095 265 1150 285 1200 305 1255 330 1305 3 55 1355 3 80 1405 405 1450 430 1500 4 60 1545 4 90 1890 1 98 2 13 2 28 2 46 2 65 2 83 3 02 3 21 3 43 3 66 Page 26 BLOWER DATA 090 102 120 150 BLOWER TABLE INCLUDES RESISTANCE FOR LCA102 BASE UNIT ONLY WITH DRY INDOOR COIL amp AIR FILTERS IN PLACE FOR ALL UNITS ADD 1 Wet indoor coil air resistance of selected unit 2 Any factory installed options air resistance heat section economizer etc 3 Any field installed accessories air resistance duct resistance diffuser etc Then determine from blower table blower motor output and drive required MINIMUM AIR VOLUME REQUIRED FOR USE WITH OPTIONAL ELECTRIC HEAT 1 090 amp 102 requires 3000 cfm 1415 L s minimum air with electric heat LCA120 amp LCA150 models require 4000 cfm 1890 L s minimum air with electric heat BOLD ITALIC INDICATES FIELD FURNISHED DRIVE Total Static Pressure in
29. 87 2 05 995 1 90 1050 2 20 1100 2 45 1145 2 65 1195 2 95 1 42 1 64 1 83 1 98 2 20 1010 2 10 1060 2 3511110 2 65 1160 2 90 1205 3 20 1 57 1 75 1 98 2 16 2 39 1025 2 35 1075 2 60 1125 2 85 1170 3 15 1215 3 40 1 75 1 94 2 13 2 35 2 54 1040 2 55 1090 2 85 1135 3 10 1185 3 40 1230 3 70 1 90 2 13 2 31 2 54 2 76 1055 2 80 1105 3 10 1150 3 35 1195 3 65 1240 3 95 2 09 2 31 2 50 2 72 2 95 1070 3 05 1120 3 35 1165 3 65 1210 3 95 1255 4 30 2 28 2 50 2 72 2 95 3 21 090 3 35 1135 3 65 1185 4 00 1225 4 30 1270 4 65 2 50 2 72 2 98 3 21 3 47 1105 3 65 1155 4 00 1200 4 30 1245 4 65 1285 5 00 2 72 2 98 3 21 3 47 3 73 1125 3 95 1175 4 35 1215 4 65 1260 5 00 1300 5 35 2 95 3 25 3 47 3 73 3 99 1190 4 70 1235 5 05 1280 5 45 3 51 3 77 4 07 1165 4 70 1210 5 1011255 5 45 3 51 3 80 4 07 1190 5 15 1230 5 50 3 84 4 10 1210 5 60 4 18 RPM BHP 1220 2 80 2 09 1230 3 00 2 24 1240 3 25 2 42 1250 3 45 2 57 1260 3 70 2 76 1270 4 00 2 98 1285 4 30 3 21 1295 4 60 3 43 1310 4 95 3 69 1325 5 30 3 95 1340 5 70 4 25 1145 4 35 3 25 BLOWER DATA 080 100 102 120 150 FACTORY INSTALLED OPTIONS FIELD INSTALLED ACCESSORY AIR RESISTANCE Wet Indoor Coil Economizer Air Volume
30. 895 1120 rpm kit 6 1110 1395 rpm 15 x 15 in 381 x 381 mm 2 hp 1 5 kW 3 hp 2 2 kW 5 hp 3 7 kW 23h E 8 3 26 W 5 43 kW 2 hp kit 1 680 925 rom kit 3 895 1120 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 3 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 6 1110 1395 rpm 5 hp kit 4 895 1120 rpm kit 6 1110 1395 rpm Disposable pleated MERV 7 standard or MERV 11 optional 4 18 x 24 x 2 457 x 610 x 51 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 Cooling Ratings 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering indoor coil air High Temperature Heating Ratings 47 F 8 C db 43 F 6 C wb outdoor air temperature and 70 F 21 C entering indoor coil air Low Temperature Heating Ratings 17 F 8 C db 15 F 9 C wb outdoor air temperature and 70 F 21 C entering indoor coil air 2 ntegrated Part Load Value rated at 80 F 27 C outdoor air temperature 3 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 Using total air volume and system static pressure requirements determine from blower performance tables rp
31. Altitude Derate Natural gas units may be installed at altitudes up to 2000 feet 610m above sea level without any modification At al titudes above 2000 feet 610 m units must be derated to match gas manifold pressures shown in the following table NOTE This is the only permissible derate for these units TABLE 41 Altitude ft m Gas Manifold Pressure in w g kPa 2001 3000 610 915 3 6 0 90 3001 4000 915 1220 3 5 0 87 4001 5000 1220 1525 3 4 0 85 5001 6000 1525 1830 3 3 0 82 6001 7000 1830 2135 3 2 0 80 7001 8000 2135 2440 3 1 0 77 Derate Procedure 1 Check manifold pressure at the gas valve pressure tap with unit operating at high fire second stage 2 To reduce maximum input turn regulator adjusting screw figure 22 counterclockwise 3 Re check manifold pressure 7 Inshot Burner two styles used Burners are factory set for maximum air and cannot be ad justed Always operate unit with access panel in place A peep hole is furnished in the heating access panel for flame viewing Natural gas should burn basically blue with some clear streaks L P gas should burn mostly blue with some clear yellow streaks Figures 31 and 32 show how to remove burner assembly Turn off power to unit and shut off gas supply Remove two screws securing burners to burner sup port figure 31 For the earlier style assembly remove screws holding the burner supp
32. Blower Belt Adjustment Proper pulley alignment and belt tension must be main tained for maximum belt life NOTE Tension new belt after 24 48 hours of operation This will allow belts to stretch and seat in grooves 1 Loosen four screws securing blower motor to sliding base See figure 14 2 To increase belt tension Turn belt tension adjusting screw to the left or coun terclockwise to tighten the belt This increases the dis tance between the blower motor and the blower hous ing To loosen belt tension Turn the adjusting screw to the right or clockwise to loosen belt tension 3 Tighten four screws securing blower motor to sliding base once adjustments have been made Blower Access 1 Disconnect jack plug connector to blower motor Also disconnect jack plug connector heating limit switches on LGA units 2 Remove screws on either side of blower assembly slid ing base See figure 14 3 Pull base toward outside of unit BLOWER ASSEMBLY TO INCREASE BELT TENSION 1 Loosen four bolts securing motor base to mounting frame ALIGN TOP EDGES PARALLEL BEFORE TIGHTENING MOTOR 2 Turn adjusting bolt to the right or clockwise to move the motor outward and tighten the belt 3 Tighten two bolts on motor pulley side IMPORTANT Align top edges of blower motor base and mounting frame base parallel before tightening two bolts on the other side of base Motor shaft and blower shaft must be parallel 4 Tig
33. Heating demand initiates at W1 in thermostat 3 24VAC is routed through TB34 to the main control mod ule A55 After A55 proves N C primary limit 515 and secondary limit S20 the electric heat contactor K15 is energized 4 N O contacts K15 1 closes allowing the first bank of elements to be energized SECOND STAGE HEAT 5 With the first stage heat operating an additional heat ing demand initiates at W2 in the thermostat 6 24VAC is routed through the main control module A55 which in turn energizes the electric heat contactor K16 7 N O contacts K16 1 close allowing the second set of elements to be energized END OF SECOND STAGE HEAT 8 Heating demand is satisfied Terminal W2 in the ther mostat is de energized 9 Electric heat contactor K16 is de energized 10 The second set of electric heat elements are de ener gized END OF FIRST STAGE HEAT 11 Heating demand is satisfied Terminal W1 in the thermo stat is de energized 12 Electric heat contactor K15 is de energized 13 The first set of electric heat elements are de energized Page 91
34. INPUT PLUG ECONOMIZER OUTPUT PLUG BLOWER EXHAUST FAN 24V SWITCH LIMIT HI PRESS COMMON SWITCH LIMIT HI TEMP COMP SWITCH DEFROST COMPRESSOR A55 14 14 3 PILIAN 55 Q MN 5 9 56 114 OR 230V ANJII4 RED 208V 4112 PII2 LI 208 230V RANSFORMER LININ N J Mal AAR KE KKK KE fe 1 Cc9or o 40 4 cOo UCD OF BLACK COM 4 IC 220 240 50 1 uru rvprv vrnu uurrmi ur ulig A TO N 380 420 5 Dj Jo gt DESCRIPTION COMPONENT OVERLOAD RELAY BLOWER MOTOR SWITCH DEFROST TERMINATION SWITCH DISCONNECT SWITCH FREEZESTAT COMP SWITCH LOW PRESS COMP TRANSF ORMER CONTROL IRANSFORMER BLOWER MOTOR IERMINAL STRIP POWER DISTRIB EQUIP TERMINAL STRIP TRANS TI GROUND Z S42 USED ON M VOLTAGE UNITS AND UNITS WITH HIGH EFFICIENCY MOTORS IF EITHER 54 OR 55 OPEN READ THE DIAGNOSTIC CODE FOR S4 LINE VOLTAGE FIELD INSTALLED NEC CEC CLASS II NOTE ALL REMAINING WIR
35. Motor amp Drives Voltage amp phase Drive kit RPM range Net face area sq ft m2 Tube diameter in mm amp No of rows Evaporator Coil Fins perineh m Drain connection no amp size in mm fpt Expansion device type Net face area sq ft m2 Condenser Coil Tube diameter in mm amp No of rows Fins per inch m Diameter in mm amp No of blades Total Air volume cfm L s Condenser Fans Page 2 SPECIFICATIONS LCA LGA R 22 R 410A General Nominal Tonnage 7 5 Ton 8 5 Ton Data Model No 090H2B 090H4B 102H2B 102H4B Cooling Efficiency Type High High Cooling Gross Cooling Capacity Btuh kW 93 800 27 5 93 000 27 2 105 000 30 8 103 000 30 2 Performance 1 Net Cooling Capacity Btuh 90 000 26 4 90 000 26 4 101 000 29 6 99 000 29 0 ARI Rated Air Flow cfm L s 2900 1370 3200 1510 3 Sound Rating Number dB 88 88 Total Unit Power kW 8 0 8 0 9 0 8 8 1 EER Btuh Watt 11 3 11 3 11 2 11 2 2 Integrated Part Load Value Btuh Watt 12 0 12 3 11 7 12 2 Refrigerant cnar 8 Circuit 1 10 bs 456 kg 10 bs 225 4 3 urnished R S 8 02 4 9 5 8 oz 4 9 R 410A Circuit 2 10 158 0 oz 4 54 kg 10 158 8 oz 4 76 kg 10 Ibs 8 oz 4 76 kg 9 108 8 oz 4 31 kg Refrigerant Charge Furnished Circuit 1 12 Ibs 0 oz 5 44 kg 12 Ibs 0 oz 5 44 kg w Humiditrol Option
36. R 22 10 Ibs 8 oz 4 76 kg 10 Ibs 8 oz 4 76 kg 410A Circuit 2 10 158 0 oz 4 54 kg 10 158 8 oz 4 76 kg 10 Ibs 8 oz 4 76 kg 9 108 8 oz 4 31 kg Gas Heating Two Stage Gas Heat Input Type Performance Input KW First Stage Second Stage Output Btuh KW Second Stage CSA Thermal Efficiency Gas Supply Connections Recommended Gas Supply Pressure Natural LPG Propane Standard 84 500 24 8 130 000 38 1 180 000 52 7 240 000 70 3 Medium High 117 000 34 3 156 000 45 7 Standard 84 500 24 8 130 000 38 1 104 000 30 5 144 000 42 2 192 000 56 3 104 000 30 5 80 096 3 4 in npt 7 in w c 1 7 kPa 11 in w c 2 7 kPa Medium 117 000 34 3 180 000 52 7 144 000 42 2 80 0 3 4 in npt 7 in w c 1 7 kPa 11 in w c 2 7 kPa High 156 000 45 7 240 000 70 3 192 000 56 3 Compressor Type No Scroll 2 Scroll 2 Condenser Net face area sq ft m2 29 3 2 72 total 29 3 2 72 total Coil Tube diameter in mm 3 8 9 5 3 8 9 5 Number of rows 2 2 Fins per inch m 20 787 20 787 Condenser Motor horsepower W 2 1 3 249 2 1 3 249 Fans Motor rpm 1075 1075 Total Motor watts 700 700 Diameter in mm number of blades Total Air volume cfm L s 2 24 610 3 8 000 3775 2 24 610 3 8 000 3775 Evaporator Net face area sq ft mZ 10 5 0 98 total 10 5 0 98 total Coi
37. Refrigerant Charge Furnished Circuit 1 11 Ibs 8 oz 5 22 kg 10 Ibs 8 oz 4 77 kg R 22 R 410A Circuit 2 11 Ibs 8 oz 5 22 kg 10 Ibs 8 oz 4 77 kg Refrigerant Charge Furnished Circuit 1 13 Ibs 8 oz 6 12 kg 12 Ibs 8 oz 5 68 kg 11 Ibs 8 oz 5 23 kg 10 Ibs 8 oz 4 77kg Gas Heating Two Stage Gas Heat Input Type Standard Medium High Performance 84 500 24 8 130 000 38 1 417 000 34 3 180 000 52 7 156 000 45 7 240 000 70 3 Diameter in mm number of blades Total Air volume cfm L s Output Btuh KW Second Stage 104 000 30 5 144 000 42 2 192 000 56 3 CSA Thermal Efficiency 80 096 Gas Supply Connections 3 4 in NPT Recommended Gas Supply Pressure Natural 7 in w c 1 7 kPa LPG Propane 11 in w c 2 7 kPa Compressor Type No Scroll 2 Condenser Net face area sq ft m4 29 3 2 72 total Coil Tube diameter in mm 3 8 9 5 Number of rows 2 Fins per inch m 20 787 Condenser Motor horsepower W 2 1 3 249 Fans Motor rpm 1075 Total Motor watts 700 2 24 610 3 8 000 3775 Evaporator Net face area sq ft m2 Coil Tube diameter in mm Number of rows Fins per inch m Condensate Drain number and size Expansion device type 10 5 0 98 total 3 8 9 5 4 14 551 1 1 in NPT coupling Balanced Port Thermostatic Expansion Valve removeable power head Wheel nominal diameter x width in mm 4 Indoor Belt Drive
38. The LGA units use aluminized steel inshot burners with match ing tubular aluminized or optional stainless steel heat exchang ers and two stage redundant gas valve LGA uses one eleven tube burner section for high heat and one seven tube burner section for standard heat Each burner uses a burner venturi to mix gas and air for proper combustion Combustion takes place at each tube entrance As hot combustion gases are drawn upward through each tube by the combustion air blower exhaust gases are drawn out the top and fresh air gas mixture is drawn in at the bottom Heat is transferred to the air stream from all surfaces of the heat exchanger tubes The supply air blower controlled by the main control panel A55 forces air across all surfaces of the tubes to extract the heat of combus tion The shape of the tubes ensures maximum heat ex change The gas valve accomplishes staging by allowing more or less gas to the burners as called for by heating demand 3 Burner Assembly Figure 21 The spark electrode flame sensing electrode and gas valve are directly controlled by ignition control Ignition control and combustion air blower is controlled by main control panel A55 Page 46 Burners All units use inshot burners see figure 21 Burners are factory set and do not require adjustment A peep hole with cover is furnished in the heating access panel for flame viewing Always operate the unit with the access panel in place Burners can b
39. also requires different sensors Page 71 LAOAD MANUAL OUTDOOR AIR DAMPER DAMPER ASSEMBLY UNIT DIVISION PANEL LAOADM MOTORIZED OUTDOOR AIR DAMPER FILTER BRACKET SIDE VIEW HOOD SEAL S HOOD TOP FILTER S 16x20x1 2 FIGURE 35 1 TMP MODE SENSIBLE TEMPERATURE In the TMP mode the IMC uses input from the factory installed RT6 Supply Air Sensor RT16 Return Air Sensor and RT17 Outdoor Air Sensor to determine suitability of outside air and economizer damper operation When outdoor sensible temperature is less than return air sensible temperature out door air is used for cooling This may be supplemented by me chanical cooling to meet comfort demands This application does not require additional optional sensors 2 ODE MODE OUTDOOR ENTHALPY The ODE or outdoor enthalpy mode requires a field 16K96 or factory provided and installed Honeywell C7400 enthalpy sensor The sensor monitors outdoor air temperature and humidity enthalpy When outdoor air enthalpy is below the enthalpy control setpoint the economiz er modulates to allow outdoor air for free cooling 3 DIF MODE DIFFERENTIAL ENTHALPY The DIF or differential enthalpy mode requires two field 16K97 or factory provided and installed Honeywell C7400 enthalpy sensors One sensor is installed in the outside air opening and the other sensor is in
40. blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction 1 Certified in accordance with the ULE certification program which is based on ARI Standard 340 360 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 wb entering evaporator air minimum external duct static pressure 2 ntegrated Part Load Value rated at 80 27 outdoor air temperature 3 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 3 SPECIFICATIONS LCA LGA R 22 R 410A Input Btuh KW First Stage Second Stage General Nominal Tonnage 10 Data Model No 120H2B 120H4B Cooling Efficiency Type High Cooling Gross Cooling Capacity Btuh KW 125 000 36 6 124 000 3 63 Performance 1 Net Cooling Capacity Btuh KW 120 000 35 2 120 000 3 52 ARI Rated Air Flow cfm L s 3600 1700 3 Sound Rating Number dB 88 Total Unit Power kW 10 9 10 8 1 EER Btuh Watt 11 2 11 0 2 Integrated Part Load Value Btuh Watt 12 2 12 0
41. display Sensor white case no display Sensor black case display Sensor black case no display Sensor duct mount black no display Aspiration Box for duct mounting Handheld CO Monitor 14 in 356 mm height Net Weight 24 in 610 m height Net Weight 14 in 356 mm height 18 in 457 mm height 24 in 610 mm height LTIAQSDMKO03 36 COSNSRSOAE1L COSNSRS2AE1L COSNSRS1AE1L COSNSRS3AE1L LTAIAQSDMBNO3 36 COMISC16AE1 LTAIAQSHM03 36 LARMF10 15 14 126 Ibs 57 kg LARMF 10 15 24 174 Ibs 79 kg LARMF10 15S 14 LARMF10 15S 18 LARMF10 15S 24 Page 13 OPTIONAL ELECTRIC HEAT ACCESSORIES LCA LHA088 UNIT FUSE BLOCKS WITH ELECTRIC HEAT Unit Model No LCA088S LHA088S EHA see Electric Heat Data tables for additional information 7 5 15 22 5 30 45 Model No Electric Heat kW Input Range 208 230v 2 hp 1 5 kW 460v 2 hp 1 5 kW 575v 2 hp 1 5 KW Exhaust 208 230v 3 hp 2 2 kW Fans 460v 3 hp 2 2 kW Unit Fuse 575v 3 hp 2 2 kW Gane 208 230v 2 hp 1 5 kW phase 460v 2 hp 1 5 kW 575v 2 hp 1 5 kW 208 230v 3 hp 2 2 kW 460v 3 hp 2 2 kW 575v 3 hp 2 2 kW LTB2 ELECTRIC HEAT TERMINAL BLOCK LTB2 175 30K75 175 amps LTB2 335 30K76 335 amps Required For Units Without Disconnect Circuit Breaker But With Single Point Power Source Without Power Exhaust Fans 208 230v 3ph 3 hp 2 2 kW NOTE
42. in the thermostat 24 24 is routed through TB34 to the main control module A55 and heat pump control A61 After A55 and A61 proves N C high pressure switch S4 and S7 compressor contactor K1 and K2 are energized NOTE On first heating demand after unit has been in cooling mode module A55 and A61 will de energize re versing valve L1 and L2 and low ambient relay K58 and K118 K58 1 and K118 1 N C contacts will take control away from low ambient pressure switches S11 and S84 25 N O contacts K1 1 and K2 1 close energizing compres sor B1 and B2 26 24 from the main control module A55 is routed through N C low ambient contact K58 1 to energize out door fan contactor K10 27 N O contacts K10 1 close energizing outdoor fan B4 and N C contacts K10 2 open de energizing compressor crankcase heater HR1 28 24 from heat pump control A61 is routed through low ambient contact to energize outdoor fan relay K68 29 N O contacts K68 1 close energizing outdoor fan B5 Second Stage Heat electric heat 30 Second stage heat demand energizes W2 in the thermo stat 31 See sequence of operation for electric heat Defrost Mode 32 During heating operation when outdoor coil drops to 35 4 the defrost thermostat S6 or S9 closes initiating defrost after minimum run time of 30 60 or 90 minutes 33 When defrost begins the reversing valve L1 or L2 is ener gized Supplemental electric heat is energized
43. infiltration during unit off cycle See installation instructions for more detail NOTE GED is optional except required with power ex haust dampers LAGED AND LAPEF INSTALLATION ECONOMIZER FRESH AIR HOOD GRAVITY EXHAUST 22 LAPEF 77 POWER EXHAUST FAN ASSEMBLY LAGED GRAVITY EXHAUST DAMPERS FIGURE 36 G LAPEF08 10 and 10 15 Power Exhaust Fan LAPEF10 15 power exhaust fan is used with LGA LHA series units LAPEF requires optional down flow gravity ex haust dampers and LAREMD economizers is used in down flow applications only The power exhaust fan provides ex haust air pressure relief and also runs when return air dampers are closed and the supply air blower is operating Figure 36 shows location of the LAPEF See installation in structions for more detail H Optional Cold Weather Kit Canada only Electric heater is available to automatically control the minimum temperature in the gas burner compartment Heater is C G A certified to allow cold weather opera tion of unit down to 60 F 50 C The kit includes the following parts 1 Transformer T20 is a 600V to 120 240V stepdown trans former mounted in the blower compartment 2 T20 has two in line fuses F20 one on each leg of the trans former Both are rated at 15 amps 3 The strip heater HR6 is located as close as possible to the gas valve It is wired in series with T20 The strip heater is rated at 500 Watts 4 At
44. overfire For natural gas units operating pressure at the unit gas connection must be between 4 7 W C and 10 5 W C 1168 Pa and 2610 Pa For L P gas units operating pressure atthe unit gas connection must be between 10 8 W C and 13 5 W C 2685 3 Pa and 3356 7 Pa On multiple unit installations each unit should be checked separately while operating at maximum rate beginning with the one closest to the supply gas main and progressing to the one furthest from the main Multiple units should also be tested with and without the other units operating Supply pressure must fall within the range listed in the previous paragraph 4 Check and Adjust Manifold Pressure After line pressure has been checked and adjusted check manifold pressure Move test gauge to the outlet pressure tap located on unit gas valve GV1 See figure 22 for location of pressure tap on the gas valve The manifold pressure is factory set and should not re quire adjustment If manifold pressure is incorrect and no other source of improper manifold pressure can be found the valve must be replaced White Rodgers gas valve can be adjusted for high fire only Honeywell valves are adjustable for both high and low fire Refer to figure 22 for location of gas valve man ifold pressure adjustment screw See table 4 for factory set manifold pressure All gas valves are factory regulated The gas valve should completely and immediately cycle off in the event of gas or p
45. oz 8 Ibs 8 oz Retigerant routs 8880 8380 Furnished Ten 8 Ibs 0 oz 8 Ibs 8 oz 8 165 8 oz 80 forma LE Heat Input Type Standard Standard Two Stage Input low Btuh KW 83 000 24 3 119 000 34 9 83 000 24 3 119 000 34 9 Heatin capacity Output Low Btuh kW 66 000 19 3 96 000 27 8 66 000 19 3 96 000 27 8_ LPG Propane Input High KW 125 000 36 6 180 000 52 8 125 000 36 6 180 000 36 6 at Sea Level Output High Btuh kW 100 000 29 3 144 000 42 2 100 000 29 3 144 000 42 2 A G A C G A Thermal Efficiency 80 0 Gas Supply Connections in Natural or 1 Recommended Gas 7 1 7 Supply Pressure wc in kPa 3ILPG Propane 11 27 1 12 x 12 305 x 305 2 1 5 2 30 1 7 208 230v 460v or 575v 3ph 1 or 2 845 1130 3 or 4 1015 1300 3 2 2 3 45 2 6 208 230v 460v or 575v 3ph 1 or 2 845 1130 3 or 4 1015 1300 9 72 0 90 3 8 9 5 3 14 551 2 1 1 25 4 Balanced Port Thermostatic Expansion Valve removeable power head 23 78 2 21 3 8 9 5 2 20 787 4 1 24 610 3 5300 2501 Motor horsepower W 1 2 373 UE Toral Motor walis 5 Filters Type of filter Disposable Commercial Grade Pleated furnished No and size in mm 4 18 x 20 x 2 457 x 508 x 51 Electrical character
46. phase scroll compressors must be phased se quentially to ensure correct compressor and blower rota tion and operation Compressor and blower are wired in phase at the factory Power wires are color coded as fol lows line 1 red line 2 yellow line 3 blue 1 Observe suction and discharge pressures and blower rotation on unit start up 2 Suction pressure must drop discharge pressure must rise and blower rotation must match rotation marking If pressure differential is not observed or blower rotation is not correct 3 Disconnect all remote electrical power supplies 4 Reverse any two field installed wires connected to the line side of S48 disconnect or TB13 terminal strip Do not reverse wires at blower contactor 5 Make sure the connections are tight Discharge and suction pressures should operate at their normal start up ranges C Cooling Startup LHA NOTE Crankcase heaters must be energized 24 hours be fore attempting to start compressor Set thermostat so that there is no demand to prevent compressor from cycling Ap ply power to unit 1 Set thermostat or temperature control device fan switch to AUTO ON Set thermostat or temperature control device to initiate a first stage cooling demand A Y1 cooling demand will energize compressor B1 Units With Optional Economizer The optional economizer will start on a first stage Y1 cooling demand when outdoor air enthalpy is suitable An increased cooling dema
47. s minimum air with electric heat in horizontal applications LCA LHA models require 2600 cfm 1225 L s minimum air with electric heat in downflow applications BOLD ITALICS INDICATE FIELD FURNISHED DRIVE Air Total Static Pressure Inches Water Gauge Pa Volume 0 20 5 00 109 159 9 80 200 1 00 250 1 20 300 1 40 350 1 60 409 1 80 450 2 00 495 kW kW kW kW kW kW kW kW kW kW 945 30 0 41 0 52 0 67 0 82 0 97 1 16 1 38 1 64 1 87 1040 37 0 48 0 60 0 75 0 90 1 08 1 27 145 1 68 1 94 1135 48 0 60 0 71 0 86 1 01 1 19 1 34 1 57 1 79 2 01 7 1 2800 2600 760 080 840 095 915 1 10 990 130 1060 150 1125 175 1195 200 1255 225 1320 2 55 1380 2 85 1230 60 0 71 082 0 97 1 12 1 31 149 1 68 1 90 2 13 805 1 00 880 1 15 955 130 1020 150 1090 1 70 1155 195 1215 220 1280 245 1335 2 70 1395 3 05 1325 75 0 86 0 97 1 12 1 27 145 1 64 1 83 2 01 2 28 3000 855 120 925 135 990 150 1055 170 1120 195 1185 215 1245 240 1300 265 1360 2 95 1415 3 25 1420 90 1 01 1 12 1 27 1 45 1 60 1 79 1 98 2 20 2 42 3200 900 140 965 1560 1030 175 1095 200 1155 220 1215 245 1270 265 1330 295 1385 3 25 1435 3 50 1510 1 04 1 19 1 31 1 49 1 64 1 83 1 98 2 20 2 42 2 61 3400 950 170 1010 185 1075 205 1130 225 1190
48. the switch closes initiating defrost after minimum run time of 30 60 or 90 minutes When the temperature rises to 60 F 5 F 15 6 C 2 8 the switch opens 12 Filter Drier all units LGA LCA LHA units have a filter drier located in the liquid line of each refrigerant circuit at the exit of each condenser coil outdoor coil in LHA units The drier removes contaminants and moisture from the system 13 Freezestats S49 and S50 Each unit is equipped with a low temperature switch freezes tat located on a return bend of each evaporator coil 549 first circuit S50 second circuit are located on the corresponding evaporator coils Each freezestat is wired to the main control module A55 Each freezestat is a SPST N C auto reset switch which opens at 29 F 3 F 1 7 C 1 7 C on a temperature drop and closes at 58 F 4 F 14 4 C 2 2 C on tempera ture rise To prevent coil icing freezestats open during compressor operation to temporarily disable the respec tive compressor until the coil warms sufficiently to melt any accumulated frost If the freezestats are tripping frequently due to coil icing check the unit charge airflow and filters before allowing unit back in operation Make sure to eliminate conditions which might pro mote evaporator ice buildup 14 Condenser Fan Motors B4 and B5 See specifications section of this manual for specifications of condenser fans B4 and B5 LGA LCA LHAO90 102 120 150 u
49. variations in these pressures may be expected due to differences in installations Significant differences could mean that the system is not properly charged or that a problem ex ists with some component in the system Correct any system problems before proceeding 6 If discharge pressure is high remove refrigerant from the system If discharge pressure is low add refrigerant to the system e Add or remove charge in increments e Allow the system to stabilize each time refriger ant is added or removed 7 Use the following approach method along with the nor mal operating pressures to confirm readings LHA REFRIGERANT CIRCUITS OUTDOOR COIL STAGE 1 OUTDOOR COIL STAGE 2 FIGURE 27 TABLE 16 LGA LCA088S Outdoor CIRCUIT 2 Discharge Suction Discharge Suction Entering 10 5 10 5 Air Temp psig psig psig Psig 65 186 71 183 70 21 72 208 72 88 238 74 25 74 270 77 269 77 105 F 304 78 302 115 F 342 81 340 TABLE 17 LGA LCA088H Outdoo CIRCUIT CIRCUIT2 Discharge Suction Discharge Suction Entering 210 25 210 25 Air Temp psig psig psig psig 65 176 74 176 76 202 75 20 77 abr 231 77 232 78 95 264 78 265 80 105 F 300 80 51 115 F 339 82 31 82 TABLE 18 LHA088 Outdoor Coil En Di
50. with service valves lo cated in the discharge and liquid lines The service valves are used to store liquid refrigerant in the condens er and shorten recovery time The valves are manually operated and are also used for service operation 7 Reversing Valve L1 and L2 units only A refrigerant reversing valve with a 24 volt solenoid coil is used to reverse refrigerant flow during unit operation in all LHA units The reversing valve is connected in the va por line of the refrigerant circuit The reversing valve coil is energized during cooling demand and during defrost Reversing valve L1 is controlled by the main control module A55 in response to cooling demand or by de frost Reversing valve L2 is controlled by heat pump module A61 in response to second stage cooling de mand 8 Accumulator early production units Early production LHA units are equipped with accumula tors The purpose ofthe accumulator is to trap and evap orate all liquid refrigerant and prevent liquid refrigerant from entering the compressor 9 Defrost Pressure Switch S46 and S104 LHA only The defrost pressure switch S46 and S104 are auto re set SPST N C pressure switches which open on a pres sure rise All LHA units are equipped with these switches The switches are located on the suction line during heating cycle discharge line during cooling and defrost cycle 546 is wired to the main control board A55 and S104 is wired to heat pump control bo
51. 0 units the electric heat section thermostat is factory set to open at 170 F 5 F 76 2 8 C on a temperature rise and automatically reset at 130 F 6 F 54 4 C 3 3 C a temperature fall For EHA100 units the electric heat section thermostat is factory set to open at 160 F 5 F 71 0 C 2 8 C on a temperature rise and automatically reset at 120 F 6 F 49 0 C 3 3 C on a temperature fall the thermostat is not adjustable 4 High Temperature Limit S20 Secondary 20 is a SPST N C manual reset thermostat Like the pri mary temperature limit S20 is wired in series with the first stage contactor coil K15 and second stage contactor coil K16 When S20 opens contactors K15 K16 are de energized When the contactors are de energized first stage and all subsequent stages of heat are de energized The thermostat is factory set to open at 220 F 6 F 104 C 3 3 C on a temperature rise and can be manu ally reset when temperature falls below 160 F 71 0 5 Terminal Strip TB3 Electric heat line voltage connections are made to terminal strip TB3 or a fuse block on some models located in the upper left corner of the electric heat vestibule 6 Heating Elements HE1 HE2 HE6 and HE7 Heating elements are composed of helix wound bare nich rome wire exposed directly to the airstream Three ele ments are connected in a three phase arrangement The elements in 208 230V units are connected in a Del
52. 00 50900 102 400 575V 86 000 99J09 93 900 40 38 Ibs 17 kg 102 400 45 kW 115 300 129 000 EHA150 45 200 153 600 129 000 odd 141 000 100 153 600 575V 129 000 29412 141 000 80 42 Ibs 19 kg 153 600 NOTE Circuit breaker option is available on any unit configuration with Maximum Overcurrent Protection of 150A or less 1 LTB2 Terminal Block See Optional Electric Heat Accessories tables 2 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 3 HACR type breaker or fuse May be used with two stage control Page 55 Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in field installed heaters Also requires TABLE 12 8 5 TON LHA102H 1 REQUIRES UNIT FUSE BLOCK AND TERMINAL BLOCK Total Unit Electric Heat 3 Total Unit Electric Heat Maximum Fuse Size Electric Heat No Volts kW Btuh cee power Exhaust E ane with Power Exhaust Fans der No of Input Input Output et Weight Steps 2 hp 3 hp 5 hp 2 hp 3 hp 5 hp 1 5 kW 2 2 3 7 kW 1 5kW 2 2 3 7 kW 7 5 kW Heat 1 208 5 6 19 100 1 220 6 3 21 500 EHA102 7 5 Sa ea 23 60 71 74 80 80 80 90 ane 240 7 5 25 600 460V 1 35 40 99J02 575
53. 000 81 82 84 90 90 90 49 Ibs 22 kg 42 600 60 0 204 800 NOTE Circuit breaker option is available on any unit configuration with Maximum Overcurrent Protection of 150A or less 1 Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in field installed heaters Also requires LTB2 Terminal Block See Optional Electric Heat Accessories tables 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 1679 75 3 HACR type breaker or fuse May be used with two stage control Page 58 TABLE 15 12 5 TON LHA150S 3 UNITS 1 REQUIRES UNIT FUSE BLOCK AND TERMINAL BLOCK 2 Total Unit Electric Heat 3 Total Unit Electric Heat Maximum Fuse Size Minimum Circuit Ampacity with Mos dun Power Exhaust Fans with Power Exhaust Fans rate npu npu utpu amp Net Weight Steps P 2 3 hp 5 hp 2 hp 3 hp 5 hp 1 5 kW 2 2 kW 3 7 kW 1 5 kW 2 2 kW 3 7 kW 15 kW 208 11 3 38 600 220 12 6 43 000 EHA150 15 106 109 115 110 110 125 230 13 8 47 100 208 230V 99J04 240 15 0 51 200 460 99905 575V 99J06 31 Ibs 14 kg 22 5 kW 60 22 5 208 230V 99J28 42 440 18 9 64 500 460V 42 460 20 7 70 700 63 65 68 70 70 70 99427 42 480 22 5 76 800 575V 99J30
54. 090 150 SIS on ES S555 A 5 lt 27 6 NIA 5 16 HEAT 2 IKL7 HEAT 5 IK18 I CONTACTOR ELECTRIC HEAT 4 2 PLUG ELECTRIC HEAT 7 PLUG ELECT HT SUB BASE 57 PLUG ELECTRIC HEAT LIMIT PIII P OUTPUT 115 PLUG BLOWER 4 COOL 1 CONT 20 PLUG ELECTRIC HEAT CONTROL 156 PLUG ELECTRIC HEAT 145 E R AR OCA 515 SWITCH LIMIT PRIMARY ELECT HT 520 JW TCH L MIT SECONDARY ELECT 3 ITCH LIMIT PRIMARY ELECT HT ONDAR W RANSF ORMER TI HEAT ERMINAL STRIP UNIT ERMINAL STRIP ELECTRIC HEAT TERMINAL STRIP POWER DISTRIB TB3 USED ON SOME UNITS ERMINAL STRIP TRANS TI TERMINAL STRIP TRANS TI8 Z NOT USED ON 15 AND 30 KW UNITS HEATING 5 Supersedes Form No New Form No 531 973W 532 637W 1998 Lennox Industries Inc Litho U S A Page 90 Sequence of Operation EHA 7 5 15 22 5 30 45 60 kW Y and G J M NOTE This sequence of operation is for all Electric Heat kW ratings Y through J voltages Each step of op eration is numbered and can be followed in sequence on the diagrams Operation for G J and M voltages will be the same HEATING ELEMENTS 1 Terminal Strip TB3 is energized when the unit discon nect closes TB3 supplies line voltage to electric heat elements HE1 through HE7 Each element is protected by fuse F3 FIRST STAGE HEAT 2
55. 0K75 NOTE Extremes of operating range are plus and minus 1096 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 19 ELECTRIC HEAT ELECTRICAL DATA 8 5 TON HIGH EFFICIENCY R 410A LCA LGA102H4 Voltage 60hz 3 phase 208 230V 3ph 460V 3ph 575V 3ph Compressors Rated Load Amps each total 16 0 32 0 7 1 14 2 5 6 11 2 Locked Rotor Amps each total 91 182 46 92 37 74 Outdoor Fan Full Load Amps each total 2 4 4 8 1 3 2 6 1 0 2 0 Motors 2 Locked Rotor Amps each total 4 7 9 4 24 4 8 1 9 3 8 Power Horsepower 1 3 249 1 3 249 1 3 249 Exhaust Fan Full Load Amps 24 1 3 1 0 Locked Rotor Amps 47 24 1 9 Service Outlet 115V 15 Amps 15 Amps Indoor Horsepower 2 3 5 5 2 3 5 Blower Motor Rated Load Amps 7 5 10 6 16 7 7 6 2 7 3 9 6 1 Locked Rotor Amps 46 9 66 105 45 6 162 23 4 36 6 1 Maximum Unit only 20 25 Overcurrent Protection with power 0 kW 25 25 exhaust 5 kw 25 25 15 kw 30 30 22 5 kW 35 40 30 kW 45 45 45 kW 70 70 2 Minimum Unit only 49 52 rx px 19 21 Circuit with power 0 kW 20 22 A exhaust 7 5 20 22 15 kw 25 27 22 5 kW 34 36 30 kW 43 45 45 kW 61 63 Unit Fuse Unit only 56 94 56 94 56K95 56K52 25K08 25 08 56K51 56K52 Block with power exhaust 56K94 56K94 56K95 25 08 25 08 25 09 56K52 56K52
56. 1 Reheat Compressor 1 Reheat amp Refieat Compressor 2 Cooling Compressor 1 Cooling amp Compressor 2 Cooling Compressor 1 Cooling amp Reheat e Y Le Y2 Compressor 2 Cooling If there is no reheat demand and outdoor air is suitable free cooling will operate there is no reheat demand and outdoor air is suitable free cooling and compressor 1 will operate If there is no reheat demand and outdoor air is suit able free cooling compressor 1 and compressor 2 will operate NOTE Another thermostat staging option is available which allows both compressors to be energized during free cooling See ECTO 5 04 option 1 in IMC manual Combination of Demands Tables 44 and 45 show unit operation at reheat and thermo stat demands The following examples show unit operation when reheat and thermostat demands overlap 1 Compressor 1 is operating Y1 and a reheat de mand is initiated Compressor 1 operation is not interrupted 114 reheat solenoid valve is energized for compressor 1 reheat and compressor 2 is energized 2 Compressor 1 and compressor 2 are operating Y1 amp Y2 and there is a demand for reheat then Y2 cooling is satisfied Compressor 1 does not de energize L14 reheat solenoid valve is energized resulting in compressor 1 reheat and compressor 2 cooling 3 Compressor 1 reheat is in operation and a Y1 cool ing demand is initiated Compressor 2 is energized for cool
57. 1315 1 5 12 2 37 34 4 8 7 6 20 4 126 8 45 6 1 Maximum Overcurrent Protection amps With Exhaust Fan Less Exhaust Fan Minimum Circuit With Exhaust Fan Ampacity Less Exhaust Fan 25 25 18 20 17 19 60 60 70 60 60 70 30 30 35 25 30 30 20 25 20 25 48 51 57 46 49 55 24 25 28 22 24 27 18 21 17 20 Optional Power Number Horsepower W Exhaust Fan Full load amps Locked rotor amps Service Outlet 115 volt amp rating 1 1 3 249 24 4 7 1 1 8 249 4 8 24 1 1 8 249 1 0 1 9 1 1 3 249 24 47 1 1 3 249 13 24 1 1 3 249 10 19 15 15 15 Model No LHA120H LHA150S Line voltage data 60 Hz 3 phase 208 230V 460V 575V 208 230V 460V 575V Compressors Number of Compressors 2 2 2 2 2 2 Rated load amps each total 17 3 34 6 9 0 18 0 7 1 14 2 19 3 38 6 9 0 18 0 7 4 14 8 Locked rotor amps each total 123 246 62 124 50 100 156 312 75 150 54 108 Outdoor Number of Motors 2 2 2 2 2 2 Fan Motors Full load amps each total 2 4 4 8 1 3 2 6 1 0 2 0 24 4 8 1 3 2 6 1 0 2 0 Locked rotor amps each total 4 7 9 4 2 4 4 8 1 9 3 8 4 7 9 4 24 4 8 1 9 3 8 Indoor Motor Output hp 2 3 512 3 5 2 3 5 Blower Motor kW 1 5 22 37 15 2 2 3 7 1 5
58. 140 0 90 1 04 790 1 35 855 1 60 1 01 1 19 810 1 50 870 1 75 1 12 1 31 830 1 70 890 1 95 1 27 1 45 850 1 90 010 220 1 42 1 64 870 2 15 930 245 1 60 1 83 895 240 955 270 1 79 2 01 920 2 70 975 3 00 2 01 2 24 945 3 00 1000 3 35 2 24 2 50 970 3 35 1020 3 65 2 50 2 72 995 3 70 1045 4 05 2 76 3 02 RPM BHP 855 120 90 915 0 870 1 30 930 0 97 750 1 05 820 1 25 885 1 451940 0 78 0 93 1 08 1 27 895 1 60 955 1 19 915 1 34 RPM BHP kW 140 1 04 1 55 1 16 1 70 1 85 1 38 1 801970 2 05 1 53 930 2 00 985 2 25 1 49 1 68 950 2 25 1005 2 50 1 68 1 87 965 2 4511020 2 75 1 83 985 2 75 1040 3 05 1 2 05 2 05 2 28 1005 3 00 1060 3 35 2 24 2 50 1030 3 35 1080 3 65 2 50 2 72 1050 3 65 1100 4 00 2 72 2 98 1070 4 00 1120 4 35 2 98 3 25 1095 4 40 1145 4 80 3 28 1120 4 80 3 58 1165 5 20 1020 4 05 1070 4 45 3 02 3 32 3 58 3 88 885 3 351940 3 701995 4 10 2 50 2 76 3 06 1045 4 45 1095 4 85 3 32 3 62 1145 5 25 1190 5 65 3 92 Page 27 4 21 RPM BHP RPM BHP RPM BHP RPM BHP BHP kW kW kW kW kW 975 1 60 1030 1 85 1080 2 05 1130 2 30 1175 2 55 1 19 1 38 1 53 1 72 1 90 985 1 75 1040 2 00 1090 2 25 1140 2 50 1185 2 75 1 31 1 49 1 68 1
59. 17 kg EHA100 30 208 230v 16L14 460v 16L15 575v 16116 38 Ibs 17 kg EHA100 45 208 230v 16L17 460v 16L18 575v 16L19 42 lbs 19 kg FEI HE FEI EI FEI FEI FEI EI ZE FE FEI FEI FEI FEI FEI MI SI FEI FEI FEI dH HE HE SI HI FEI z Page 54 TABLE 11 7 5 TON LHA090H 1 REQUIRES UNIT FUSE BLOCK AND TERMINAL BLOCK 2 Minimum Circuit Ampacity Total Unit Electric Heat 3 Maximum Overcurrent Protection Total Unit Electric Heat MON Volts kw with Power Exhaust Fans with Power Exhaust Fans pha npu npu utpu amp Net Weight Steps 4 p E 2 hp 3 hp 5 hp 2 hp 3 hp 5 hp 1 5 Z2kW 37 1 5kW 22kW 3 7 kW 7 5 kW Heat 208 5 6 19 100 220 6 3 21 500 2 230 6 9 23 600 208 230 240 75 25 600 99 01 460 99302 40 575V 99J03 31 Ibs 14 kg 15 kW EHA150 15 208 230V 99J04 30 460V 99J05 575V 99J06 31 Ibs 14 kg 22 5 kW 57 700 EHA360 22 5 18 3 425 20 6 70 700 Sea 22 5 76 800 18 9 64 500 460V 49 460 20 7 70 700 56 57 60 60 60 60 27429 42 480 22 5 76 800 575V 42 550 19 0 64 500 99J30 42 575 207 70 700 44 45 47 45 45 50 38 Ibs 17 kg 42 600 22 5 76 800 30 kW 42 208 22 5 76 800 4 EHA150 30 2 133 136 143 150 150 150 42 240 30 0 102 400 86 0
60. 2 Locked Rotor Amps each total 91 182 46 92 34 68 Outdoor Full Load Amps each total 2 4 4 8 1 3 2 6 1 0 2 0 Fan Motors 2 Locked Rotor Amps each total 4 7 9 4 2 4 4 8 1 9 3 8 Power Horsepower 1 8 249 1 3 249 1 3 249 Exhaust Fan Full Load Amps 24 1 3 1 0 Locked Rotor Amps 4 7 24 1 9 Service Outlet 115V GFI 15 Amps 15 Amps 15 Amps Indoor Horsepower 2 3 5 2 3 5 2 3 5 Blower Motor Rated Load Amps 7 5 10 6 16 7 3 4 4 8 7 6 2 7 3 9 6 1 Locked Rotor Amps 46 9 66 105 20 4 26 8 45 6 16 2 234 36 6 1 Maximum Unit only 50 60 70 25 30 30 20 20 25 Overcurrent Protection with power 0 60 60 25 exhaust 7 5 60 60 25 15 60 70 30 22 5 90 90 40 30 110 110 45 45 150 175 70 2 Minimum Unit only 44 49 20 cron with power OkW 48 51 21 A mpacity exhaust 7 5kW 48 51 21 15 58 62 27 22 5 kW 81 84 36 30 103 107 45 45 148 152 63 Unit Fuse Unit only 56 93 56K94 56K95 56K52 25K08 25K08 56K51 56K51 56K52 Block with power exhaust 56 94 56K94 56K95 25K08 25K08 25K09 56K51 56K51 56 52 Disconnect 0 15 kW 84M13 84M13 84M13 84M13 84M13 22 5 kW 84M13 84M13 84 13 84M13 84 13 30 45 kW 84M14 84 14 84 13 84 13 84 13 Terminal Block 30K75 30K75 30K75 NOTE Extremes of operating range are plus and minus 109 of line voltage 1 HACR type breaker or fuse 2 Referto Nation
61. 360 Cooling Ratings 95 F 35 C outdoor air temperature and 80 F 27 C db 67 F 19 C wb entering indoor coil air High Temperature Heating Ratings 47 F Low Temperature Heating Ratings 17 F 2 Integrated Part Load Value rated at 80 F 27 C outdoor air temperature 3 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 8 8 C db 43 F 6 C wb outdoor air temperature and 70 F 21 C entering indoor air 8 C db 15 F 9 C wb outdoor air temperature and 70 F 21 C entering indoor air OPTIONAL FIELD INSTALLED ACCESSORIES LCA LGA LHA088 Condensate Drain Trap field installed only may be factory enclosed to ship with unit Dirty Filter Switch Senses static pressure increase indicating a dirty filter condition Down Flow Gravity Exhaust Dampers Aluminum blade dampers prevent blow back and outdoor air infiltration during off cycle bird screen furnished Net Weight NOTE See below for damper hood LAGED08 10 8 Ibs 4 kg Down Flow Gravity Exhaust Dampers Hood Fiel
62. 38 Ibs 17 kg 30 kW 12 208 22 5 76 800 42 220 252 86 000 EHA150 30 42 572 MN 1151 154 160 175 175 175 md 42 240 30 0 102 400 12 440 252 86 000 460V 42 460 27 5 93 900 75 76 79 80 80 80 39303 42 480 30 0 102 400 575V 42 550 25 2 86 000 99J09 42 575 275 93 900 60 61 64 60 70 70 38 Ibs 17 kg 42 600 30 0 102 400 45 kW 12 208 33 8 115 300 150 45 2 52 196 199 205 200 200 225 208 230V 42 240 45 0 153 600 99J10 12 440 37 8 129 000 odd 42 460 41 3 141 000 97 99 101 100 100 110 42 480 45 0 153 600 575V 42 550 37 8 129 000 99412 42 575 413 141 000 78 79 82 80 80 90 42 Ibs 19 kg 42 600 45 0 153 600 60 kW 12 208 45 0 153 600 42 220 50 4 172 000 EHA150 60 42 22 P 185 060 205 208 214 225 225 225 208 230V 42 240 60 0 204 800 99J13 5 2 440 50 4 172 000 Sota 42 460 55 1 188 000 102 103 106 110 110 110 42 480 60 0 204 800 575V 42 550 50 4 172 000 99 15 42 575 55 1 188 000 82 83 85 90 90 90 49 Ibs 22 kg 42 600 60 0 204 800 NOTE Circuit breaker option is available on any unit configuration with Maximum Overcurrent Protection of 150A or less 1 Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in field installed heaters Also requires LTB2 Terminal Block See Optional Electric Heat Accessories tables 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable f
63. 3M33 e e e e 575V LAPEF10 15 73 34 9 e e e NOTE The catalog and model numbers that appear here are for ordering field installed accessories only amp Field Installed or Configure to Order factory installed O Configure to Order Factory Installed S Configure to Order Factory Installed Standard Efficiency Models Only H Configure to Order Factory Installed High Efficiency Models Only X Field Installed 1 Humiditrol option is only available for R 22 models Page 11 OPTIONs ACCESSORIES Item Catalog 090 102 120 150 No ROOF CURBS ClipLock 1000 8 in 203 mm height C1CURBAOB 1 26W31 x x x x 14 in 356 mm height LARMF10 15S 14 65 34 x 18 in 457 mm height LARMF10 15S 18 65 35 x x x x 24 in 610 mm height 10 155 24 35 36 Standard 14 in 356 mm height LARMF10 15 14 53 50 24 in 610 mm height LARMF10 15 24 49K54 x CEILING DIFFUSERS Step Down RTD11 95 29604 Order one Canada Only RTD11 95S 13 61 x RTD11 135 29605 x x Canada Only RTD11 135S 13 62 RTD11 185 29606 Canada Only RTD11 150 180S 13K63 Flush FD11 95 29608 Order one Canada Only 11 955 13K56 x FD11 135 29609 Canada Only 11 1355 13K57 FD11 185 29610 Canada Only FD11 150 180S 13K58 Transitions LASRT08 10 24L14 x Supply and Return Order on
64. 5 10 F 1 5 6 0 5 9 F 1 5 C 0 5 14 F 1 7 7 C40 5 8 F 1 4 4 C 0 5 Page 63 LGA LCAUnit 090H TABLE 40 Humiditrol Units APPROACH TEMPERATURE Liquid Temp Minus Ambient Temp 1st Stage 4 F 1 2 2 C 0 5 2nd Stage 7 1 3 8 C 0 5 102H 120H 090H Std amp Humiditrol 102H Std amp Humiditrol 120H 120H Humiditrol 5 F 1 2 7 C 0 5 5 F 1 2 7 C 0 5 R 410A 8 F 1 4 4 C 0 5 4 1 2 2 C 05 TF 1 3 8 C 0 5 5 1 2 7 C 0 5 8 1 4 4 C 0 5 7 1 3 8 C 0 5 TF 1 3 9 C 0 5 6 1 3 3 0 5 10 F 1 5 5 C 0 5 10 F 1 5 5 C 0 5 IV STARTUP OPERATION Refer to startup directions and refer closely to the unit wiring diagram when servicing See unit nameplate for minimum circuit ampacity and maximum fuse size A Preliminary and Seasonal Checks 1 Make sure the unit is installed in accordance with the installation instructions and applicable codes 2 Inspect all electrical wiring both field and factory installed for loose connections Tighten as required Refer to unit diagram located on inside of unit control box cover 3 Check to ensure that refrigerant lines are in good con dition and do not rub against the cabinet or other re frigerant lines 4 Check voltage at the disconnect switch Voltage must be within the range listed on the nameplate If not con sult the p
65. 7 9 9 9 Smoke Detector Return LTARSDK10 30 70 86 9 e 9 ELECTRICAL Voltage 208 230V 3 phase Factory 60 hz 460V 3 phase Factory O 575V 3 phase Factory HACR Circuit Breakers Factory 6 O Disconnect Switch 80 84 13 9 9 9 9 150 84 14 9 e e GFI Service Outlets LTAGFIK10 15 74 70 e e e Phase Monitor Factory NOTE The catalog and model numbers that appear here for ordering field installed accessories only amp Field Installed or Configure to Order factory installed O Configure to Order Factory Installed X Field Installed Page 10 OPTIONs ACCESSORIES Item Catalog 090 102 120 150 No HUMIDITROLZ CONDENSER REHEAT OPTION Humiditrol Factory 1H Humidity Sensor Kit Remote Mounted required COSNSR13AE 1 17M50 Remote Sensor Wall Seal Plate COMISC18AE 1 58L33 INDOOR AIR QUALITY Air Filters High Efficiency Air Filters MERV 11 1 20 1 97186 9 e Order MERV 15 5 1 28W04 x x x x Germicidal Lamps Healthy Climate UVC Germicidal Lamps 208 230 CTUVCL10B 1Y 7521 460V C1UVCL10B 1G 7526 575V C1UVCL10B 1J 7531 Indoor Air Quality Sensors CO Sensor white case w display COSNSR50AE1L 77 39 x x Senso
66. 75 208 230V 4 99907 2 240 30 0 102 400 42 440 25 2 86 000 42 460 27 5 93 900 73 75 77 80 80 80 42 480 30 0 102 400 575 42 550 25 2 86 000 99 09 2 575 27 5 93 900 58 59 62 60 60 70 38 Ibs 17 kg 42 600 30 0 102 400 45 kW 42 208 33 8 115 300 42 220 37 8 129 000 EHA150 45 42 230 413 141 000 189 193 199 200 200 200 208 230V 4 99J10 2 240 45 0 153 600 129 000 460V 141 000 99J11 100 153 600 575 129 000 99212 141 000 80 42 lbs 19 kg 153 600 60 kW 153 600 172 000 EHA150 60 188 000 225 208 230V 9913 204 800 172 000 7 188 000 110 204 800 42 550 50 4 172 000 42 575 55 1 188 000 80 81 83 80 90 90 49 Ibs 22 kg 42 600 60 0 204 800 NOTE Circuit breaker option is available on any unit configuration with Maximum Overcurrent Protection of 150A or less 1 Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in field installed heaters Also requires LTB2 Terminal Block See Optional Electric Heat Accessories tables 2 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 3 HACR type breaker or fuse May be used with two stage control Page 57 TABLE 14 12 5 LHA150S 1 REQUIRES UNIT FUSE BLOCK AND TERMINAL BLOCK Total Unit Electric Heat 3 Total Unit Electric Heat M
67. 9 575V 3ph 56K52 56K52 25K08 25K08 7 5 56 KW 208 230 3ph m m 460V 3ph se 575V 3ph des 223 255 SE 10 hp 7 5 kW 208 230V LA nct 460V 3ph 288 EM Sa She 575V 3ph 2 222 EE 355 ELECTRIC HEAT CAPACITIES 7 5 kW 15 kw 22 5 kW 30 kW 45 kW 60 kW kw kw NO kw Btuh kw kw Ne Input Output Steps Input Output Steps Input Output Steps Input Output Steps Input Output Steps Input Output Steps 208 5 6 19100 1 1113 38600 1 169 57 700 225 76 800 33 8 115 300 2 450 153 600 2 220 63 21 500 1 126 43000 1 189 64 500 2 25 2 86 000 37 8 129 000 2 504 172000 2 230 69 23600 1 13 8 47 100 1 207 70 700 2 27 5 93 900 41 3 141 000 2 1551 188 000 2 240 75 25600 1 1150 51200 1 225 76800 2 30 0 102 400 45 0 153 600 2 600 204800 2 440 69 21 500 1 126 43000 1 189 64500 2 252 86 000 37 8 129 000 2 504 172000 2 460 69 23600 1 13 8 47 100 1 207 70 700 2 27 5 93 900 413 141 000 2 1551 188 000 2 480 75 25600 1 150 51 200 1 225 76 800 2 30 0 102 400 45 0 153 600 2 160 0 204 800 2 550 63 21500 1 126 43 000 1 189 64500 2 252 86 000 37 8 129 000 2 504 172000 2 575 69 23600 1 138 47 100 1 207 70 700 2 275 93 900 41 3 141 000 2 1551 188 000 2 600 7 5 25600 1 1150 51200 1 225 76800 2 300 102400 1 1450 153 600 2 60 0 204800 2 Page 15 ELECTRICAL DATA Model No LCA LGA088
68. ATING ELECTRIC USED 036 042 048 060 072 088 AND 100 UNITS EHA 7 7 5 10 15 20 22 5 S20 USED 2 B UNITS ONLY 25 30 1 2 Y 548 OR CBIO MAY BE USED TB3 IS USED ON SOME UNITS HEATING SECTION A5 AA USED WITH TWO SPEED BLOWER ONLY PUES S04W 522 957W 1998 Lennox Industries Inc Litho U S A Page 89 EHA 45 60KW Y D OMPONENT PAN MAIN B UNITS 090 TO 150 TB34 A60 PANEL ELECTRIC HEAT C UNITS 156 TO 240 ICBI3 CIRCUIT BREAKER TRANS 2 D UNITS 300 amp 360 FUSE ELECTRIC HEAT JFUSE UNIT A B KW 2 HE4 HES HEG HE7 HEB HE9 HEIOHEII HET HEAT I8 15 HEZ ELEMENT ELECT HEAT 2 15 15 15 15 HEAT 5 A55 gt 30 ELEMENT ELECT HEAT 5 r835 1 15 15 15 15 HEG ELEMENT ELECT HEAT 6 15 15 15 15 15 15 15 15 DER ELEMENT ELECT HEAT 8 Sief Se 5 GH HES ELEMENT ELECT 9 10 0 37 60 15 15 15 15 HE10 EWEN HEAT 10 HELL A UNITS 088 amp 100 SI0 NC gt REMOVE JUMPER PLUG WHEN FIELD HE IZ E EMENT ELECT HEAT 12 INSTALLING ELECTRIC HEAT JELEMENT ELECT HEAT 14 S10 NO ps gt A J2 P2 JI44 P144 AND S63 ARE NOT USED ON 036 042 048 060 072 088 AND 100 UNITS 17 JACK ELECT HT SUB BASE KIT 4 gt S20 USED ON 2 UNITS ONLY 2 548 OR CBIO MAY BE USED JIII OUTPUT 1 1 515 144 AND P144 ARE USED B UNITS
69. CIRCUIT 1 CIRCUIT 2 oy Air Temp psig psig psig psig evr 182 6 pase ms 5 24 75 ser wer ms 9 54 5 wer 9 Page 62 Charge Verification Approach Method 8 Using the same thermometer compare liquid tempera ture to outdoor ambient temperature Approach Temperature Liquid temperature minus ambient temperature 9 Approach temperature should match values in tables 38 39 or 40 An approach temperature greater than value shown indicates an undercharge An approach temperature less than value shown indicates an over charge 10 Do not use the approach method if system pressures do not match pressures in tables 16 through 37 The approach method is not valid for grossly over or under charged systems TABLE 38 APPROACH TEMPERATURES Liquid Temp Minus Ambient Temp 1st Stage 2nd Stage N A 15 F 1 8 C 0 5 8 F 1 44 0 5 LHA Unit 8 F 1 44 0 5 10 F 1 5 6 C 0 5 10 F 1 5 6 C 0 5 10 F 1 5 6 C 0 5 11 F 1 6 1 C 0 5 11 F 1 6 1 C 0 5 11 F 1 6 1 C 0 5 13 F 1 7 2 C 0 5 13 F 1 7 2 0 5 TABLE 39 APPROACH TEMPERATURE LCAUnit Liquid Temp Minus Ambient Temp 1st Stage 2nd Stage 8 1 4 4 C 0 5 9 1 5 0 5 088H 7 1 3 9 C 0 5 8 F 1 4 4 C 0 5 7 F 1 3 8 C 0 5 7 F 1 3 8 C 0 5 9 1 5 C 0
70. Disconnect 0 15 kW 84M13 84M13 84M13 84M13 84M13 84M13 84M13 84M13 84M13 22 5 kW 84M13 84M13 84M14 84M13 84M13 84M13 84M13 84M13 84M13 30 45 kW 84M14 84M14 84M14 84M13 84M13 84M13 84M13 84M13 84M13 Terminal Block NOTE Extremes of operating range are plus and minus 109 of line voltage 1 HACR type breaker or fuse 30K75 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 20 ELECTRIC HEAT ELECTRICAL DATA 10 TON HIGH EFFICIENCY R 22 LCA LGA120H2 Voltage 60hz 3 phase 208 230V 3ph 460V 3ph 575V 3ph Compressors Rated Load Amps each total 17 3 34 6 9 0 18 0 7 1 14 2 Locked Rotor Amps each total 123 246 62 124 50 100 Outdoor Fan Full Load Amps each total 2 4 4 8 1 3 2 6 1 0 2 0 Motors 2 Locked Rotor Amps each total 4 7 9 4 2 4 4 8 1 9 3 8 Power Horsepower 1 3 249 1 3 249 1 3 249 Exhaust Fan Full Load Amps 24 1 3 1 0 Locked Rotor Amps 4 7 24 1 9 Service Outlet 115V GFI 15 Amps Indoor Horsepower 5 2 3 5 Blower Motor Rated Load Amps 7 6 27 3 9 6 1 Locked Rotor Amps 45 6 16 2 234 36 6 1 Maximum Unit only 30 Overcurrent Protection with power 0 kW 30 exhaust 5 kW 30 22 5 40 30 kW 45 45 kW 70 60 kW 70 Minimum Unit only 52 55 25 cun with power 0 KW 26 A mpacity exhaust 15 k
71. E FACTORY INSTALLED DENOTES OPTIONAL COMPONENTS H 120 1 60 WIRING DIAGRAM 3 98 N 1H HEAT PUMP PACKAGED GROUND NOTE USE COPPER 2 CONDUCTORS ONLY THERMOSTAT HEAT ANTICIPATION LHA 088 1 6 J M Y 120V FIELD PROVIDED SETTING OAMP POWER SUPPLY IS WARNING ELECTRIC SHOCK HAZARD CAN REQUIRED WHEN T29 CAUSE INJURY OR DEATH UNIT UMP SECTION 51 IS NOT PROVIDED MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES 532 639W 1998 Lennox Industries Inc Litho U S A Page 83 SEQUENCE OF OPERATION 88 Power 1 Line voltage from unit disconnect energizes transform er T1 T1 provides 24VAC power to terminal strip TB34 which provides 24VAC to the unit cooling heating and blower controls and thermostat 2 Terminal TB13 is also energized when unit disconnect switch closes TB13 provides line voltage to compres sor crankcase heater compressor contactor the blow er motor contactor and condenser fan relay Blower Operation 3 The main control module receives a demand from ther mostat terminal G A55 energizes blower contactor K3 with 24VAC 4 N O K3 1 closes energizing blower B3 Economizer Operation 5 The economizer control module A56 receives a demand and energizes exhaust fan relay K65 with 24 at 5096 outside air damper open adjustable 6 K65 1 K65 2 both close e
72. EAT OMPRESSOR OPTIONAL OPTIONAL FIGURE 4 Page 31 LGA LCA LHA088 100 CONTROL BOX Low Ambient Fan Relay K58 LHA Only Combustion Air Relay K13 LGA Only Power Exhaust Relay Economizer Module A56 K65 Main Control Module A55 Compressor 2 Module A57 Transformer T1 7 Fan Relay K10 Transformer T3 460 amp 575V Only Terminal Strip Compressor Contactor K1 K2 TB34 5 584 o o 8 5 Fan Capacitor C1 7 Blower Contactor Overload Relay 542 Some Motors Terminal Strip K13 o Terminal strip TB1 FIGURE 5 090 102 120 150 CONTROL BOX Compressor 2 Low Ambient Relay K58 LHA Only ow Ambient Kit elay K118 LHA Only 65 Economizer Module Module LGA A56 LHA only A57 CAL Relay K13 LGA Only e o Outdoor Fan Fuse Some Models F10 o
73. EAT to reset ignition control 1 Placing Furnace In Operation Gas Valve Operation for White Rodgers 36C and Honey well VR8205Q VR8305Q figure 29 1 Set thermostat to lowest setting 2 Turn off all electrical power to appliance 3 This appliance is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand 4 Open or remove the heat section access panel 5 Turn the knob on the gas valve clockwise 499 to OFF Depress 36C knob slightly Do not force 6 Wait five 5 minutes to clear out any gas If you then smell gas STOP Immediately call your gas suppli er from a neighbor s phone Follow the gas supplier s instructions If you do not smell gas go to the next step WHITE RODGERS 36C76 GAS VALVE GAS VALVE SHOWN IN OFF POSITION Gas valve knob is shown in OFF position FIGURE 29 7 Turn the knob on the gas valve counterclockwise to ON Do not force 8 Close or replace the heat section access panel 9 Turn on all electrical power to appliance 10 Set thermostat to desired setting 11 The combustion air inducer will start The burners will light within 40 seconds 12 If the appliance does not light the first time gas line not fully purged it will attempt up to two more ignitions be fore locking out 13 If lockout occurs repeat steps 1 through 10 14 If the appliance will not operate follow the instructions Turning Off Gas to A
74. ER AIR RESISTANCE 2011 Flush Air Volume 2 Ends Open Diffuser cfm L s in w g Pa Pa Pa 2400 1135 0 21 52 2600 1225 0 24 60 2800 1320 0 27 67 088 amp 100 3000 1415 0 32 80 Models 3200 1510 0 41 102 3400 1605 0 50 124 3600 1700 0 61 152 3800 1795 0 73 182 3600 1700 0 36 90 3800 1795 0 40 99 4000 1890 0 44 109 4200 1980 0 49 122 E 120 4400 2075 0 54 134 4600 2170 0 60 149 4800 2265 0 65 162 5000 2360 0 69 172 5200 2455 0 75 186 4200 1980 0 22 55 4400 2075 0 28 70 4600 2170 0 34 85 4800 2265 0 40 99 150 Models 5000 2360 0 46 114 5200 2455 0 52 129 5400 2550 0 58 144 5600 2645 0 64 159 5800 2735 0 70 174 Page 28 BLOWER DATA 080 100 102 120 150 Cont CEILING DIFFUSER AIR THROW DATA Effective Throw Range RTD11 Step Down Air Volume Model No 10 12 31 38 9 12 Throw is the horizontal or vertical distance airstream travels on leaving the outlet or diffuser before the maximum velocity is reduced to 50 ft 15 m per minute Four sides open 088 amp 100 Models POWER EXHAUST FANS PERFORMANCE Return Air System Static Pressure CEILING DIFFUSER AIR THROW DATA RTD11 Step Down FD11 Flush cm Us ft NNNM 2075 34 52 45 2385 ss ar 1 34 86 45 11 40 50 12 15 5500 2595 43 52 o 55 46 Air Volume Model No 102 amp 120 Models 48 52 5 1 45 544 16 Throw is the horizontal or verti
75. HERMOSTAT diagram in the back of this manual L Dirty Filter Switch S27 The dirty filter switch senses static pressure increase indi cating a dirty filter condition The switch is N O and closes at 1 W C 248 6 Pa The switch is mounted on the top filter channel corner Wiring for the dirty filter switch is shown on the ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT dia gram in the back of this manual M Indoor Air Quality Sensor A63 The indoor air quality sensor monitors CO levels and re ports the levels to the main control module A55 The board adjusts the economizer dampers according to the lev els The sensor is mounted next to the indoor thermostat or in the return air duct Refer to the indoor air quality sensor installation instructions for proper adjustment Wiring for the indoor air quality switch is shown on the ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT diagram in the back of this manual N LP Propane Kit A natural to LP propane gas changeover kit is required for gas conversion on LGA088 090 100 102 120 150 series units The kit includes a gas valve and burner orifices Page 73 O Factory Installed Humiditrol to the reheat coil Return air pulled across the evaporator 090 102 120 coil is cooled and dehumidified the reheat coil adds heat to supply air See figure 37 for reheat refrigerant routing Humiditrol units provide a dehumidifying mode of opera and figure 38 fo
76. L DATA for 090 102 120 For LCA088 100 and 150 and all LHA electric heat data see Tables 6 through 15 All electric heat sections consist of electric heating ele ments exposed directly to the airstream See figure 24 EHA parts arrangement is shown in figures 25 and 26 Multiple stage elements are sequenced on and off in re sponse to thermostat demand HEAT SECTION PLACEMENT ELECTRIC HEAT SECTION FIGURE 24 1 Main Control Box Components A55 and F4 The main control box see figure 26 houses a few of the electric heat controls such as the main control module A55 and unit fuse block F4 For a description of mod ule A55 and fuse block F4 see section I A 2 Contactors K15 K16 Contactors K15 and K16 are three pole double break contactors located on the electric heat vestibule All contactors are equipped with a 24VAC coil The coils in the K15 and K16 contactors are energized by the main panel A55 Contactor K15 energizes the first stage heating elements while K16 energizes the second stage heating elements 3 High Temperature Limits S15 Primary 15 is a SPST N C auto reset thermostat located on the back panel of the electric heat section below the heating elements 515 is the high temperature limit for the electric heat section When 515 opens indicating a problem in the system contactor K15 is de energized When K15 is de energized first stage and all subsequent stages of heat are de energized For EHA102 15
77. LGA LCA088 amp 100 UNIT WIRING DIAGRAM 24V POWER RED 208V ORANGE 230V BLACK COM DESCRIPTION COMPONENT PANEL MAIN PANEL ECONOMIZER PANEL COMPRESSOR 2 COMPRESSOR COMPRESSOR 2 MOTOR BLOWER MOTOR OUTDOOR FAN MOTOR EXHAUST FAN CAPACITOR OUTDOOR FAN CAPACITOR EXHAUST FAN CIRCUIT BREAKER TRANS TI DESCRIPTION COMPONENT HEATER COMPRESSOR HEATER COMPRESSOR 2 JACK GFI RECEPTACLE HOW 21 113 JACK EXHAUST FAN JACK EXHAUST FAN JACK OUTDOOR FAN JACK GAS OUTPUT JACK COOLING SENSOR INPUT JACK BLOWER amp COOL CONTROL JACK SENSOR INPUT N JACK ECONOMIZER OUTPUT JACK COMPRESSOR 2 JACK BIO EXHAUST FAN MOTOR JACK BLOWER OVERRIDE STD CONTACTOR COMPRESSOR Tele Jere CONTACTOR COMPRESSOR 2 FE CONTACTOR BLOWER RELAY OUTDOOR FAN RELAY EXHAUST FAN PLUG EXHAUST FAN COMPT PLUG EXHAUST FAN PLUG OUTDOOR FAN PLUG GAS OUTPUT PLUG COOLING SENSOR INPUT PLUG BLOWER amp COOL CONTROL PLUG SENSOR INPUT PLUG ECONOMIZER OUTPUT PLUG COMPRESSOR 2 UFererorererere Ferr PLUG BIO EXHAUST FAN MOTOR SWITCH LIMIT HI PRESS COMP SWITCH LIMIT HI PRESS COMP 2 S
78. LTB2 Terminal Block See Optional Electric Heat Accessories tables 2 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 3 HACR type breaker or fuse May be used with two stage control Page 56 TABLE 13 10 TON LHA120H 1 REQUIRES UNIT FUSE BLOCK AND TERMINAL BLOCK Minimum Circuit Ampacity 3 Maximum Overcurrent Protection Electric Heat No Total Unit Electric Heat Total Unit Electric Heat Volts kW Btuh with Power Exhaust Fans with Power Exhaust Fans Model No of Input Input Output amp Net Weight Steps 2 hp 3 hp 5 hp 2 hp 3 hp 5 hp 1 5 kW 2 2 kW 3 7 kW 1 5 kW 2 2 kW 3 7 kW 15 kW 1 208 11 3 38 600 1 220 12 6 43 000 EHA150 15 4 230 13 8 47 100 99 102 108 100 110 110 208 230V 99J04 1 240 15 0 51 200 1 440 12 6 43 000 1 460 13 8 47 100 51 52 55 60 60 60 1 480 15 0 51 200 575 1 550 12 6 43 000 39J06 1 575 138 47100 40 41 44 40 45 45 31 Ibs 14 kg 1 600 150 51 200 22 5 kW 42 208 16 9 57 700 42 220 18 9 64 500 EHA360 22 5 i 42 230 207 70 700 122 125 131 125 125 150 208 230V 4 99J28 2 240 22 5 76 800 49 440 4515 42 460 62 63 70 42 480 575 42 550 18 9 64 500 99 730 2 575 207 70 700 49 50 53 50 50 60 38 Ibs 17 kg 42 600 22 5 76 800 30 kW 42 208 22 5 76 800 42 220 25 2 86 000 EHA150 30 i 42 230 275 93 900 144 147 154 150 150 1
79. MP PACKAGED LHA 090 102 120 150 1 6 J M Y HEAT PUMP SECTION 814 Supersedes Form No New Form No 555 0835W 554 568W 0 2004 Litho U S A SEQUENCE OF OPERATION LHA090 150 Power 1 Line voltage from unit disconnect energizes transform er T1 T1 provides 24VAC power to terminal strip TB34 which provides 24VAC to the unit cooling heating and blower controls and thermostat 2 Terminal TB13 is also energized when unit disconnect switch closes TB13 provides line voltage to compres sor crankcase heater compressor contactor the blow er motor contactor and condenser fan relay Blower Operation 3 The main control module receives a demand from ther mostat terminal G A55 energizes blower contactor K3 with 24VAC 4 N O K3 1 closes energizing blower B3 Economizer Operation 5 The economizer control module A56 receives a demand and energizes exhaust fan relay K65 with 24 at 5096 outside air damper open adjustable 6 K65 1 and K65 2 both close energizing ex haust fan motor B10 First Stage Cooling Demand compressor B1 7 First stage cooling demand energizes Y1 and in the thermostat G energizes blower see step 3 8 24VAC is routed through TB34 to the main control module A55 9 A55 proves N O defrost switch S6 and N C defrost ter mination switch S46 to energize reversing valve L1 and low ambient relay K58 10 N C contacts K58 1 open giving control o
80. Motor Horsepower W 1 3 249 Total Watts Input 300 Smoke Detector Photoelectric type installed in supply air section or return air section or both sections Duc 2 Supply Aspiration box for duct mounting of Indoor Air Quality Sensor 47N18 Coil Guards Galvanized steel wire guards to protect outdoor coil Not used with Hail Guards 24L55 Dehumidistat Monitors humidity levels reports to the IMC board which allows the heating and cooling to run 65F86 simultaneously as needed Diffusers Aluminum grilles large center grille insulated diffuser box with Step Down flanges hanging rings furnished interior transition even air flow internally double deflection louvers RTD11 95 88 Ibs 40 kg sealed prevents recirculation adapts to T bar ceiling grids or plaster ceilings Net Weight Flush fixed blade louvers FD11 95 75 Ibs 34 kg Downflow Roof Mounting Frame Nailer strip furnished mates to unit U S 14 inch 356 mm height LARMF08 10 14 118 Ibs 54 kg National Roofing Contractors Approved shipped knocked down Net Weight 24 inch 610 mm height LARMF08 10 24 162 Ibs 74 kg Hail Guards Constructed of heavy gauge steel painted to match cabinet helps protect outdoor coils from 24L54 hail damage Not used with Coil Guards Horizontal Conversion Kit Two piece duct cover in kit blocks off unit down flow supply air opening horizontal retum 3 17125 air opening panel
81. N E NSOR R 65 JACK COOL INTERFACE OCCUPIED OPERATION WITH JUMPER OR AX 9 IS SERVICE RELAY OUTPUT 24VAC aN DIEA RAT BLOWER MOTOR 1 Ufo PACK RETUR a Em OVERLOAD RELAY BLOWER MOTOR IF USED CONNECT TO INDICATOR LIGHT TWITCH DEHUBIDISTAT SSESSGL RELAY BITTER RMINAL STRIP 24V CLASS II J99 P99 100 100 ne 4103 103 ARE NOT USED 0N 036 042 048 060 072 088 AND 100 UNITS ALTERNATE REMOTE LOCATION OF RT6 tu Gg dUS ECONOMIZER OUTPUT VALVE FOR SIMOLTANECUS HEATING AND COOLING JUMPER BLOWER PROVING AX 20 FOR DEHUMIDIFICATION CONTROL QNOMIZER HARN AX ALTERNATE TERMINAL DESIGNATIONS WHEN USING 2187 DH400 SENSOR ELAY TRANSFER 2 DESIGNATES OPTIONAL WIRING BLOWER 1 5 CLASS II FIELD WIRING pes Fav WIRING DIAGRAM 8701 Pes Ee ONE ACCESSORIES P100 PLUG RE TURN TEMP SENSOR 3 12120002 Bee ae ec ace POWER 555 5291 1 Terminal strip TB34 energizes the thermostat components with 24VAC via TB1 OPERATION 2 The main control module A55 proves the optional N O filter switch S27 indicates dirty filter when closed optional air flow switch S52 indicates no air i e broken belt system shuts down and optional C G A 50 C low ambient kit thermostat S59 used in C G A units only The main control module A55 receives dat
82. Stainless Steel Condensate Drain Pan Factory HEATING SYSTEM Combustion Air Intake Extensions LTACAIK10 15 89197 Gas Heat Input Standard 130 kBtuh input Factory O 2 Stage Medium 180 kBtuh input Factory 0 High 240 kBtuh input Factory Low Temperature Vestibule Heater Factory LPG Propane 130 kBtuh input LTALPGK 130 72 94 Conversion Kits 180 kBtuh input LTALPGK 180 72 95 x 240 kBtuh input LTALPGK 240 72M96 x Stainless Steel Heat Exchanger Factory Vertical Vent Extension LTAWEK10 15 73M72 Blower SUPPLY AIR Constant Air Volume 2 hp Standard or High Efficiency Factory 3 hp Standard or High Efficiency Factory 5 hp Standard or High Efficiency Factory CABINET Coil Guards 88K51 Grille Guards 86K29 Hail Guards 88K24 Horizontal Discharge Conversion Kit LTHSDKGC10 15 56K53 CONTROLS Blower Proving Switch COSWCHO1AE1 30 49 9 9 e Commercial Controls L Connection amp Building Automation System 9 e 9 e Novar amp ETM 2051 Unit Controller 71M58 9 9 e Sectra Zoning Sytem with Bypass Control COCTRLO4EA1L 34 41 e e 9 e Sectra Zoning Sytem Single Zone Control COCTRLOSEA1L 23 51 9 e Dirty Filter Switch COSWCHOOAE1 30 48 e e e Fresh Air Tempering COSNDCO3AE 1 45L78 9 9 9 9 Smoke Detector Supply LTSASDK10 36 70 8
83. Terminal Block is factory installed in units with factory installed electric heat without disconnect circuit breaker but with single point power source NOTE ALL 460V AND 575V UNIT VOLTAGES USE LTB2 175 30K75 TERMINAL BLOCK 30K75 30K76 208 230v 3ph 3 hp 2 2 kW TES 2 hp 1 5 kW 1 15 30K75 208 230v 3ph 3 hp 2 2 kW LTB2 Terminal 22 5 kW 2 hp 1 5 kW 30K75 Block 208 230v 3ph 3 hp 2 2 kW 3 phase 2 hp 1 5 kW 22 30 KW 30K75 208 230v 3ph 3 hp 2 2 kW ELECTRIC HEAT TERMINAL BLOCKS kW Input Range 7 5 15 22 5 30 45 15 22 5 30 45 60 LTB2 ELECTRIC HEAT TERMINAL BLOCK LTB2 175 175 amps LTB2 335 335 amps Required For Units Without Disconnect Circuit Breaker But With Single Point Power Source Unit Model No LHA090H LHA102H LHA120H LHA150S Model EHA see Electric Heat Data tables for additional information Electric 7 5 kW All hp All voltages 3ph LTB2 175 LTB2 175 15 kW All hp 208 230V 3ph LTB2 175 LTB2 175 LTB2 175 LTB2 175 22 5 kW All hp 208 230V 3ph LTB2 175 LTB2 175 LTB2 175 LTB2 175 30 kW All hp 208 230V 3ph LTB2 175 LTB2 175 LTB2 175 LTB2 175 45 kw All hp 208 230V 3ph LTB2 335 LTB2 335 LTB2 335 LTB2 335 60 kW All hp 208 230V 3ph LTB2 335 LTB2 335 90 kW All hp 208 230V 3ph NOTE 460v and 575v models use LTB2 175 terminal block NOTE Terminal Block is factory installed in units with factory installed electric heat w
84. The roof mounting frame MUST be squared to the roof and level before mounting Plenum system MUST be installed before the unit is set on the mounting frame Typical roof curbing and flashing is shown in figure 34 Refer to the roof mounting frame installation instruc tions for proper plenum construction and attachment TYPICAL FLASHING DETAIL UNIT BASE BOTTOM UNIT BASE RAIL FIBERGLASS INSULATION Furnished COUNTER FLASHING NAILER STRIP Field Supplied Furnished CANT STRIP Field Supplied RIGID INSULATION Field Supplied ROOF MOUNTING FRAME Extends around entire perimeter of unit FIGURE 34 ROOFING MATERIAL B Transitions Optional supply return transitions LASRTO08 10 and 10 12 are available for use with LGA 7 5 8 5 and 10 ton series units utilizing optional LARMF08 10 and 10 15 roof mounting frame LGA LCA LHA 12 5 ton units will use LASRT15 with LARMF 10 15 roof mounting frame Transition must be installed in the LARMF mounting frame before mounting the unit to the frame Refer to the manufacturer s instructions included with the transition for detailed installation procedures LASRT10 12 and LASTR15 are included with factory installed economizers Page 70 C Supply and Return Diffusers Optional flush mount diffuser return FD11 and extended mount diffuser return RTD11 are available for use with the LGA LCA LHA units Refer to manufacturers instructi
85. Total Motor watts 1050 700 Diameter in mm 2 24 610 2 24 610 Number of blades 3 3 Total Air volume cfm L s 10 000 4719 8000 3775 Indoor Coil Net face area sq ft m2 10 5 0 98 total 10 5 0 98 total Tube diameter in mm 3 8 9 5 3 8 9 5 Number of rows 4 4 Fins per inch m 14 551 14 551 Condensate Drain number and size 1 1 in NPT coupling 1 1 in NPT coupling Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head Indoor Nominal motor output 2 np 1 5 kW Blower 3 hp 2 2 kW and 5 hp 3 7 KW Drive Maximum usable motor output 2 3 hp 1 7 kW Selection US Only 3 Se 2 6 5 4 3 Motor Drive kit 2 hp kit 1 680 925 rpm kit 43 895 1120 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 3 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 46 1110 1395 rpm 5 hp kit 4 895 1120 rpm kit 46 1110 1395 rpm Wheel nominal diameter x width 15 x 15 in 381 x 381 mm Filters Type of filter Disposable pleated MERV 7 standard or MERV 11 optional Number and size in mm 4 18 x 24 x 2 457 x 610 x 51 Electrical characteristics 208 230V 460V or 575V 60 hertz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction Certified in accordance with the ULE certification program which is based on ARI Standard 340
86. V 1 99J03 30 30 31 Ibs 14 kg 1 15 kW 1 150 15 100 100 208 230V 4 99J04 1 440 12 6 43 000 460V 1 460 13 8 47 100 46 48 51 50 50 60 99J05 1 480 15 0 51 200 575V 1 99J06 40 40 31 Ibs 14 kg 1 22 5 kW 42 208 16 9 57 700 42 220 18 9 64 500 60 22 5 42 REA 507 116 119 125 125 125 125 See 42 240 22 5 76 800 42 440 18 9 64 500 2 42 460 20 7 70 700 58 59 62 60 60 70 42 480 22 5 76 800 575 42 550 18 9 64 500 99 30 42 575 207 70 700 45 46 48 45 50 50 38 Ibs 17 kg 42 600 22 5 76 800 30 kW 42 208 225 76 800 150 30 22 2 2 2 138 142 148 150 150 150 208 230V 42 240 30 0 102 400 99J07 42 440 25 2 86 000 Sr 42 460 27 5 93 900 69 70 73 70 70 80 42 480 30 0 102 400 575V 42 550 25 2 86 000 29409 42 575 275 93 900 54 55 57 60 60 60 38 Ibs 17 kg 42 600 30 0 102 400 45 kW 42 208 338 115 300 42 220 37 8 129 000 150 45 42 D ro 141 000 184 187 193 200 200 200 208 230V 49 240 45 0 153 600 99J10 42 440 37 8 129 000 26010 42 460 41 3 141 000 91 93 96 100 100 100 42 480 450 153 600 575V 42 550 37 8 129 000 99412 42 575 413 141 000 72 73 75 80 80 80 42 Ibs 19 kg 42 600 45 0 153 600 NOTE Circuit breaker option is available on any unit configuration with Maximum Overcurrent Protection of 150A or less 1 Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in field installed heaters Also requires
87. W 34 23 25 27 22 5 kW 45 32 34 36 30 kW 57 41 43 45 45 kW 79 59 61 63 60 kW Unit Fuse Unit only 56K94 56K95 56K95 25K09 Block with power exhaust 56K95 56K95 56K96 25K09 25K09 Disconnect 0 15 kW 84M13 84M13 84M13 84M13 22 5 kW 84M13 84M13 84M14 84M13 30 45 kW 84M14 84M14 84M14 84M13 60 kW Terminal 15 45 kW 30K75 30K75 Block 60 kW 30K76 30K75 NOTE Extremes of operating range are plus and minus 10 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 21 ELECTRIC HEAT ELECTRICAL DATA 10 TON HIGH EFFICIENCY R 410A LCA LGA120H4 Voltage 60hz 3 phase 208 230V 3ph 460V 3ph 575V 3ph Compressors Rated Load Amps each total 15 6 31 2 7 8 15 6 5 8 11 6 Locked Rotor Amps each total 110 220 52 104 35 5 71 0 Outdoor Fan Full Load Amps each total 2 4 4 8 1 3 2 6 1 0 2 0 Motors 2 Locked Rotor Amps each total 4 7 9 4 24 4 8 1 9 3 8 Power Horsepower 1 3 249 1 3 249 1 3 249 Exhaust Fan Full Load Amps 24 1 3 1 0 Locked Rotor Amps 4 7 24 1 9 Service Outlet 115V 15 Amps 15 Amps Indoor Horsepower 2 3 5 5 2 3 5 Blower Motor Rated Load Amps 7 5 10 6 16 7 7 6 2 7 3 9 6 1 Locked Rotor Amps 46 9 66 105 45 6 162 23 4 36 6 1 Maximum Unit only 20 25 Overcurrent Protection with power kW 25 25 exhau
88. WITCH LOW PRESS LOW AMB KIT OVERLOAD RELAY BLOWER MTR SWITCH DISCONNECT SWITCH FREEZESTAT COMP SWITCH FREEZESTAT COMP 2 SWITCH LOW PRESS LOW SWITCH LOW PRESS COMP SWITCH LOW PRESS COMP 2 24V TRANSF ORMER CONTROL COMMON TERMINAL STRIP POWER DISTRIB TERMINAL STRIP TRANS TI DENOTES OPTIONAL COMPONENTS EQUIP GROUND EXHAUST FAN LINE VOLTAGE FIELD INSTALLED NEC CEC CLASS NOTE ALL REMAINING WIRES FACTORY INSTALLED WIRING DIAGRAM 1 98 COMBINATION PACKAGED ROOF LCA 088 100 1 6 M Y L6A 088 100 1 6 J M Y IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING AND INSULATION THICKNESS DISCONNECT ALL POWER BEFORE SERVICING THERMOSTAT HEAT ANTICIPATION SETTING 0 1 AMP WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES NOTE FOR USE WITH COPPER CONDUCTORS ONLY 1 REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT GROUND AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE NOTE USE COPPER USED ON M VOLTAGE UNITS AND UNITS WITH CONDUCTORS ONLY HIGH EFFICIENCY MOTORS 120 1 60 HEAT COOL SECTION B4 Supersedes Form No N
89. a from the supply and return smoke detectors A17 and A64 optional phase protection monitor A42 blower motor overload relay S42 discharge sensor RT6 return air sensor RT16 and the outdoor air sensor RT17 The main control module A55 receives data from the electronic thermostat A2 Y1 Y2 W1 W2 G OCP and the CO sensor if economizer is used via terminal strip TB1 A55 energizes the appropriate components Page 87 L SERIES ECONOMIZER JOHNSON M9216 ML 72854 RANGE 2 10 VDC RANGE 2 10 VDC 2 10 VDC 7 DELETE 7 AND A62 IF USED FOR EITHER GLOBAL ENTHALPY OR SENSIBLE TEMPERATURE CONTROL FOR UNIT DIFFERENTIAL ENTHALPY CONTROL ADD A62 RETURN AIR ENTHALPY SENSOR DESCRIPTION EY COMPONENT NOTE THIS DIAGRAM USED ONLY WHEN ECONOMIZER OR 7 SENSOR SOLID STATE ENTHALPY MOTORIZED OUTDOOR AIR DAMPERS ARE INSTALLED A56 PANEL ECONOMIZE R 92 SENSOR ENTHALPY INDOOR A72 CONTROL REMOTE MIN POSTOPT WIRING DIAGRAM 8 97 MOTOR DARBER ACCESSORIES Mi ECONILZER ACCESSORIES JI04 JACK SENSOR OUTDOOR ENTHALPY L SERIES ECONOMIZER AND MOTORIZED OUTSIDE AIR DAMPER IPS PLUG UNIT ECONOMIZER 1 P104 PLUG SENSOR OUTDOOR ENTHALPY ECONOMIZER SECTION DI PLUG SENSOR RETURN AIR ENTHALP Supersedes Form No New Form No 53 713W 531 770 001997 Lennox Industries Inc Litho U S A D RMINA RIP TRANSFORMER SEQUENCE OF OPERATION L SERIES ECONOMIZER POWER 1 Terminal s
90. al Block Page 53 Total Unit with Power Ex haust Fan 4 Electric Heat Electric Heat Btuh Minimum Circuit Ampacity Model No amp of Input Output Net Weight Steps P 22 5 kW TABLE 9 LCA150 2hp 5hp 15 kW 22 KW 97 KW 20 ns 8600 1 220 126 45700 SSC 150 15 1 240 1520 51200 7 40126 436 ar E 31 Ibs 14 kg 1 15 0 51 200 EN 575 23 24 26 51 200 220 64 500 70 700 82 EEG 8 9 0 7 2 5 SE 8 9 20 7 2 22 N EN e EHA360 22 5 208 230v 99J28 460v 99329 575v 99130 38 Ibs 17 kg SE 52 so 25 7655 2 220 252 86 000 pne 72 240 30 0 102 400 SER mm 2 480 300 102 400 N 150 45 208 230v 99910 460v 99311 575v 99312 42 lbs 19 kg 504 EHA150 60 208 230v 20 99 13 460v 99314 21 49 lbs 22 kg Clem BALILI N 5 ss 1280 2 sn sfam 2a emo Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C May be used with two stage control NOTE Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in unit with field installed heaters Also requires LTB2 Terminal Block TABLE
91. al or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 18 ELECTRIC HEAT ELECTRICAL DATA 8 5 TON HIGH EFFICIENCY R 22 LCA LGA102H2 Voltage 60hz 3 phase 208 230V 3ph 460V 3ph 575V 3ph Ane Rated Load Amps each total 14 7 29 4 7 1 14 2 5 1 10 2 2 Locked Rotor Amps each total 91 182 50 100 37 74 Outdoor Fan Full Load Amps each total 2 4 4 8 1 3 2 6 1 0 2 0 Motors 2 Locked Rotor Amps each total 4 7 9 4 2 4 4 8 1 9 3 8 249 Power Horsepower 1 3 249 1 3 249 1 3 249 Exhaust Fan Full Load Amps 24 1 3 1 0 Locked Rotor Amps 4 7 24 1 9 Service Outlet 115V GFI 15 Amps Indoor Horsepower 5 2 3 5 Blower Motor Rated Load Amps 7 6 27 3 9 6 1 Locked Rotor Amps 45 6 16 2 234 36 6 1 Maximum Unit only 25 Overcurrent Protection with power 0 kW 25 exhaust 7 5 25 15 30 22 5 40 30 kW 45 45 kW 70 2 Minimum Unit only 46 49 20 cun with power 0 kW 21 A exhaust 7 5 21 15 27 22 5 36 30 kW 45 45 kW 59 61 63 Unit Fuse Unit only 56 94 56K94 56K95 25K08 56K52 Block with power exhaust 56K94 56K94 56K95 25K08 25K09 56K52 Disconnect 0 15 kW 84M13 84M13 84M13 84M13 84M13 84M13 84M13 84M13 22 5 kW 84M13 84M13 84M14 84M13 84M13 84M13 84M13 84M13 30 45 kW 84 14 84 14 84 14 84 13 84M13 84M13 84M13 84M13 Terminal Block 3
92. andard Gross Cooling Capacity Btuh KW 91 000 26 7 Cooling Cooling Capacity Btuh KW 86 000 25 2 Ratings Toa Ui Power 80 p am y TEER _____ 0 High Tl Total Heating Capacity Btuh kW 86 000 25 2 Heating 1981 Unit Power RW _____ _____ Heating Low Tl Total Heating Capacity Btuh KW 48 000 14 1 Teang Total Unit Power RW Heating Refrigerant Charge Furnished HCFC 22 17 Ibs 0 oz 7 71 kg Blower wheel nominal dia x width mm 12 x 12 305 x 305 Nominal motor output hp kW 2 1 5 2 hp 1 5 kW Max usable motor output hp kW 2 30 1 7 Indoor 3 Motor amp Drives voltage A phase 208 230v 460v or 575v 3ph Drive Kit RPM range 1 or 2 845 1130 or 4 1015 1300 Drive Selection Nominal motor horsepower kW 3 hp 2 2 kW Max usable motor output hp KW 3 45 E 3 Motor amp Drives voltage A phase 208 230v 460v or 575v 3ph rive Kit range or or D Kit RPM 1 or 2 845 1130 3 or 4 1015 1300 Net face area sq ft m 9 72 90 Tube diameter mm amp No of rows 3 8 9 5 3 Fins per inch m 14 551 2 Drain connection no amp size in mm fpt 1 1 25 4 Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head Net face area sq ft m2 23 78 2 21 Tube diameter mm amp No of rows 3 8 9 5
93. anual for complete call out of components per LGA LCA LHA unit A Control Box Components LGA LCA LHA control box components are shown in fig ures 5 and 6 The control box is located in the upper portion of the compressor compartment 1 Disconnect Switch S48 Optional all units LGA LCA LHA units may be equipped with an optional discon nect switch S48 Other factory or field installed optional cir cuit breakers may be used such as CB10 S48 and CB10 are toggle switches which can be used by the service tech nician to disconnect power to the unit 2 Control Transformer T1 all units All LGA LCA LHA series units use a single line voltage to 24VAC transformer mounted in the control box Trans former supplies power to control circuits in the unit The transformer is rated at 70VA and is protected by a 3 5 amp circuit breaker CB8 The 208 230 Y voltage 208 230V TRANSFORMER transformers use two BLUE SEGONDABY primary voltage taps as shown in figure 7 while 460 G and 575 J voltage transformers 23 VOLTS use a single primary ORANGE PRIMARY gi ack voltage tap FIGURE 7 3 A Transformers LGA 575V units All LGA 575 J voltage units use one auto voltage to 230VAC transformer mounted in the control box The transformer has an output rating of 0 5A T3 transformer supplies 230 VAC power to combustion air inducer motor B6 4 Terminal Strips TB1 TB13 TB34 all units TB1 terminal str
94. ard A61 When discharge pressure reaches 275 10 psig 1896 69 kPa indicating defrost is completed the switch opens The switch automatically resets when pressure in the suction line drops by 80 10 psig 552 69 kPa 10 High Temperature Limit Switch S5 LHAO88 only S5 discharge temperature switch is wired in series with the S4 high pressure switch S5 is a normally closed switch which opens on temperature rise The switch will open at 221 F 9 F 105 C 5 C and close at 171 F 13 F 72 C 7 2 C Actual refrigerant temperature will be higher than the switch setting due to thermal contact losses The purpose of the switch is to protect the com pressor from extreme discharge temperatures during abnormal operating conditions such as defrost with low system charge S5 and S4 are wired together to the same IMC contact which means the IMC will not distin guish one fault from the other If either switch trips the IMC will default to the S4 error codes Page 41 11 Defrost Temperature Switch S6 and S9 LHA only Defrost thermostat switches S6 and 59 have 5 5 contacts which closes on a temperature fall initiating defrost The switches are located on the expansion valve distrib utor assembly at the inlet to the outdoor coil The switch monitors the outdoor coil suction temperature to deter mine when 5 5 needed When the outdoor coil suc tion temperature falls to 35 F 4 F 1 7 C 2 2 C
95. are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 4 SPECIFICATIONS LCA LGA150 Model No PGA LCA LGA150 Blower wheel nominal dia x width in mm 1 15 15 381 38 15 x 15 381 x 381 Nominal motor output hp KW 2 1 5 2 LOS SC Max usable motor output hp KW _ 230 1 7 Drives Voltage amp phase 208 230v 460v or 575v 3ph RPM range Drive 1 or 3 options 1 680 925 3 895 1120 Evaporator Nominal motor output hp KW 3 2 2 Blower 3 hp 2 2 usable motor output hp KW 35200 O and Motor amp Drive Selection Drives Voltage amp phase J 208 230 460 575 RPM range Drive 1 thru 6 options 1 680 925 2 680 895 384 895 1120 586 1110 1395 Nominal motor horsepower kW 7 O 5 3 7 kW usable motor output KW 554 Motor amp Drives Voltage amp phase 2 208 230v 460v 575 O RPM range Drive 4 amp 6 options 64 8951120 6 1110 1395 Net face area sq ft m 105 098 t a Tube diameter in mm amp No of rows 2 38 95 3 Evaporator Coil Fins perinch m 45 Drain connection amp sze in mm fpt o o 01959
96. as Piping Gas supply piping must not allow more than 0 5 W C 124 3 Pa drop in pressure between the gas meter and the unit Supply gas pipe must not be smaller than the unit gas connection Refer to installation instructions for de tails 2 Testing Gas Piping NOTE In case emergency shutdown is required turn off the main manual shut off valve and disconnect the main power to the unit These controls should be properly la beled by the installer When pressure testing gas lines the gas valve must be dis connected and isolated Gas valves can be damaged if subjected to more than 0 5 psig 14 W C 3481 Pa See figure 30 When checking piping connection for gas leaks use the preferred means Common kitchen detergents can cause harmful corrosion on various metals used in gas piping The use of specialty Gas Leak Detector is strong ly recommended It is available through Lennox under part number 31B2001 Do not use matches candles flame or any other source of ignition to check for gas leaks Page 66 3 Testing Gas Supply Pressure When testing gas supply pressure connect test gauge to the inlet pressure tap field provided figure 30 Test supply gas pressure with unit firing at maximum rate both stages en ergized Make sure the reading falls within the range of the following values Low pressure may result in erratic op eration or underfire High pressure can result in perma nent damage to the gas valve or
97. ate for airtight seal Screws must be torqued to 35 in lbs GON mi to ensure proper operation 10 Flame Sensing Flame current is an electrical current which passes from the ignition control through the sensor electrode during unit op eration The current passes from the sensor through the flame to the ground electrode located on the flame elec trode to complete a safety circuit The electrodes should be located so the tips are at least 1 2 12 7 mm inside the flame envelope Do not bend electrodes To measure flame current follow the procedure below DANGER Electrodes are not field adjustable Any alter ations to the electrode may cause a hazardous condition that can cause property damage or per sonal injury 1 Disconnect power to unit 2 Remove lead from sensing electrode and install mi croamp meter in series between the sensing electrode and the sensing lead 3 Reconnect power and adjust thermostat for heating demand 4 When flame is established compare to table 42 Do not bend electrodes 5 Disconnect power to unit before disconnecting meter Make sure sensor wire is securely reconnected before reconnecting power to unit TABLE 42 Manufacturer JOHNSON FENWAL NOTE If the meter scale reads 0 the leads are re versed Disconnect power and reconnect leads for proper polarity 11 Combustion Air Inducer The combustion air inducer is factory set and is not field adjust able However oper
98. ation should be monitored to ensure prop er operation The combustion air inducer is used to draw fresh air into the combustion chamber while simultaneously ex pelling exhaust gases The inducer operates throughout the heating cycle Page 68 On a heating demand the ignition control is energized by the main control module A55 The ignition control then allows 30 to 40 seconds for the combustion air inducer to vent exhaust gases from the burners When the combustion air induc er is purging the exhaust gases the combustion air prove switch is closing proving that the combustion air inducer is op erating before allowing the ignition control to energize When the combustion air prove switch is closed and the delay is over the ignition control activates the first stage operator of the gas valve low fire the spark and the flame sensing electrode Sparking stops immediately after flame is sensed B Cooling System Service Checks See Charging section of this manual for Cooling service checks VI MAINTENANCE CAUTION Electrical shock hazard Turn off power to unit before performing any maintenance cleaning service operation the unit A Filters LGA LCA LHA090 102 120 150 units are equipped with four 18 x 24 x 2 457mm x 610mm x 51mm pleated throw away type filters LGA LCA LHA088 100 units are equipped with four 18 x 20 x 2 457mm x 508mm x 51mm Filters may be accessed through the economize
99. atures All LGA LCA LHA units are equipped with this switch In all models a switch is located in each liquid line prior to the indoor coil sec tion In LCA LGAO090 102 120 150 units 511 and S84 wired in parallel are wired in series with outdoor fan relay K10 compressor one Compressor two is under control through the IMC board In the LHA 090 150 S11 is wired in series with outdoor fan relay K10 compressor one and S84 is wired in series with outdoor fan relay K68 compres sor two LHA088 units will not be equipped with S11 or S84 Page 40 Units charged with R 22 When liquid pressure rises to 275 10 psig 1896 69 kPa the switch closes and the condenser fan is ener gized When discharge pressure in one refrigerant circuit drops to 150 10 psig 1034 69 kPa the switch opens and the condenser fan in that refrigerant circuit is de ener gized This intermittent fan operation results in higher evap orating temperature allowing the system to operate without icing the evaporator coil and losing capacity Units charged with R 410A When liquid pressure rises to 450 10 psig 3102 69 kPa the switch closes and the condenser fan is ener gized When discharge pressure in one refrigerant circuit drops to 240 10 psig 1655 69 kPa the switch opens and the condenser fan in that refrigerant circuit is de ener gized This intermittent fan operation results in higher evap orating temperature allowing the system to op
100. aximum Fuse Size Sein GE volts i Ww Exhaust Fane with Power Exhaust Fans amp Net Weight Steps SH 2 hp 3 hp 5 hp 2 hp 3 hp 5 hp 1 5 kW 2 2 3 7 kW 1 5 0 2 2kW 3 7 kW 15 kW 1 208 11 3 38 600 150 15 gt 104 107 113 110 110 125 240 15 0 51 200 460 1 60 60 99J05 575V 1 99J06 45 45 31 Ibs 14 kg 1 22 5 kW 60 22 5 150 150 208 230 99928 42 440 18 9 64 500 460V 42 460 20 7 70 700 62 63 66 70 70 70 93429 42 480 22 5 76 800 575V 99J30 50 60 38 Ibs 17 kg 30 kW 42 208 22 5 76 800 150 30 2 SCH 2 149 152 158 150 175 175 See 42 240 30 0 102 400 42 440 252 86 000 om 42 460 27 5 93 900 73 75 77 80 80 80 42 480 30 0 102 400 575V 42 550 252 86 000 99 09 42 875 275 93 900 59 60 62 60 60 70 38 Ibs 17 kg 42 600 30 0 102 400 45 kW 42 208 33 8 115 300 EHA150 45 22 d 22 194 197 203 200 200 225 208 230V 42 240 45 0 153 600 99J10 42 440 37 8 129 000 SG 42 460 41 3 141 000 96 97 100 100 100 100 42 480 45 0 153 600 575V 42 550 37 8 129 000 39J12 42 575 413 141 000 77 78 80 80 80 80 42 Ibs 19 kg 42 600 45 0 153 600 60 kW 42 208 45 0 153 600 150 60 2 Es 203 206 212 225 225 225 208 230V 42 240 60 0 204 800 99313 42 440 50 4 172 000 42 460 55 1 188 000 100 102 104 100 110 110 42 480 60 0 204 800 575V 42 550 50 4 172 000 39 15 42 575 554 188
101. boards are located in the upper left hand corner of the control box The control in cludes complete unit diagnostics with permanent code storage field programmable control parameters and control options on site testing and serial communica tions Three different printed circuit boards see figure 10 make up the modular configurations for the LGA LCA LHA units See table 1 for a list of control panels used for each unit For further information refer to Integrated Modular Control Guide sent with each unit TABLE 1 CONTROL PANELS UNIT LGA LCA LHA 090 102 120 150 14 Main Control Module A55 all units The main control module A55 is the heart of the system It con trols one compressor one two stage gas valve one bank of electric heat one outdoor fan and one blower A55 in cludes the thermostat inputs serial communications ports diagnostic code display control pushbutton system configura tion dip switches and four expansion ports A diagnostic code list is located on the back side of the access panel 15 Compressor 2 Control Module A57 LGA amp LCA units The compressor 2 control module A57 controls one addition al compressor stage for the LGA LCA units A57 includes all inputs and outputs required for compressor and fan control compressor stages diagnostics and low ambient control 16 Economizer Control Module A56 Economizer only The economizer control module A56 controls the econo mizer A56 has four
102. cal distance airstream travels on leaving the outletor diffuser before the maximum velocity is reduced to 50 ft 15 m per minute Four sides open 5800 2785 43 52 e een p xe 2 esst Le cpu Vp omm 16 eos 85 20 10 15 PP Jena 15 NOTE Using total air volume system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate FACTORY INSTALLED DRIVE KIT SPECIFICATIONS LGA LCA088 amp 100 Motor Outputs _ e 1088 130 Z ss 230 15 ZHighERdensy 230 15 17 85 139 105 190 3 22 28 lt SHghEWGdeny 345 22 25 1015 1900 total air volume and system static pressure requirements SSES from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output ar
103. d Installed Only Net Weight 24115 25 Ibs 11 kg Economizer Opposing gear driven recirculated air and outdoor air dampers plug in connections to unit nylon bearings neoprene seals 24 volt fully modulating spring return motor adjustable minimum damper position damper assembly slides in unit outdoor air hood must be ordered separately see below optional down flow LAREMD08 10 43 Ibs 20 kg gravity exhaust dampers available see below choice of economizer controls see below Net Weight Economizer Control Choice Sensible Control Furnished on IMC board in unit uses outdoor air sensor furnished with unit to measure outdoor air temperature and control damper position Furnished Global Control Furnished on IMC board in unit used with Direct Digital Control DDC systems uses glob al air sensor to control damper position determines when to use outdoor air for cooling or set damper at mini 16K96 Outdoor mum position Furnished 16K97 Differential Outdoor Enthalpy Control Adjustable enthalpy sensor senses outdoor air enthalpy for economizer con trol O to 10096 outdoor air Differential Enthalpy Control Two solid state enthalpy sensors allow selection between outdoor air and return air whichever has lowest enthalpy Electric Heat Factory or field installed helix wound nichrome elements time delay for element staging indi vidual element limit controls wiring harness may be two stage contr
104. different cooling modes sensible temperature outdoor enthalpy differential enthalpy and global control 17 Heat Pump Control Module A61 LHA only The heat pump control module A61 is used to control the second compressor stage on the LHA units A61 includes all inputs and outputs required for compressor and fan control compressor stage diagnostics and low ambient control Page 34 SIEMENS OVERLOAD RELAY BLUE RESET BUTTON IN FACTORY SET AUTO MODE Turn clockwise to H for manual reset GREEN TRIP INDICATOR Flush with surface not tripped Above surface tripped RED TEST BUTTON AMP ADJUSTMENT DIAL Adjust relay amp setting according to value given on the blower motor nameplate Proper relay amp set ting equals motor nameplate FLA X service factor of 1 15 X 95 Use small slotted screwdriver to adjust control mode from automatic reset A to manual reset H Control must be in the manual reset mode H to perform a test Press the red test button Green trip indi cator should pop out Press the blue reset screw to reset the relay FIGURE 8 LINE VOLTAGE IN NN TRIP INDICATON CLEAR WINDOW COVER DETAIL SHOWING RESET BUTTON SHOWN ADJUSTED TO MANUAL POSITION CLOSED Lift clear cover and turn adjustment AMP SETTING STOP screw counterclockwise Reset screw will BUTTON pop out when pointer is in M manual RED position Close cover to lock reset screw into position TELEMECANIQUE OVERLOAD RELAY
105. e 80 222 80 95 F 246 81 252 82 105 F 277 82 282 84 11522 308 83 311 ee TABLE 27 455 86 310 85 LGA LCA102H with Humiditrol TABLE 22 Se LGA LCA Series 090H R 410A Std amp Humiditrol Coil Outdoor CIRCUIT 1 CIRCUIT 2 A ded Coil Entering 015 10 Suct 5 Dis 10 Suc 5 65 F Air Temp psig psig psig psig 75 F 65 F 248 129 260 134 99r 373 140 388 141 105 421 143 438 14 115 F 473 147 492 146 TABLE 28 TABLE 23 LGA LCA102H R 410A Std amp Humiditrol LGA LCA100S NORMAL OPERATING PRESSURES Sadao CIRCUIT 1 CIRCUIT 2 ommo creona oeger Coil Discharge Suction Discharge Suction tering Dis 10 Suc 5 Dis 10 5 Entering 10 5 10 5 Air Temp psig psig psig psig SACS 1 zu 38 3 146 9 67 8 07 1 51 141 7 50 1 05 TABLE 29 LHA120 NORMAL OPERATING PRESSURES Outdoor CIRCUIT1 CIRCUIT2 Coil 15 Suct Dis Suct Entering 10 5 10 Air Temp i psig psig psig 1150F 321 85 321 82 TABLE 30 LCA LGA120S NORMAL OPERATING PRESSURES Outdoo CIRCUIT1 CIRCUIT2 Coil Discharge Suction Discharge Suction Entering 210 5 10 Air Temp psig psig psig psig 75 F 212 78 246 1 275 85 242 80 26 77 95 P 7272 82 216
106. e LASRT10 12 49K55 x x Canada Only LASRT10 12S 65K37 x x LASRT15 49 56 x LASRT15S 65 38 x NOTE The catalog and model numbers that appear here are for ordering field installed accessories only Field Installed Page 12 OPTIONAL FIELD INSTALLED ACCESSORIES LHA Item Fact Field 090 LHA102 120 LHA150 Cabinet _ Coil Guards 88K54 Accessories Hail Guards 88 27 Horizontal Discharge Conversion Kit LTHSDKGC10 15 Ceiling RTD11 95 RTD11 135 RTD11 185 Diffusers Step Down Net Weight 88 Ibs 40 kg 205 Ibs 93 kg 392 lbs 178 kg FD11 95 FD11 135 FD11 185 Flush Net Weight 75 Ibs 34 kg 174 Ibs 79 kg 289 Ibs 135 kg x LASRT08 10 LASRT10 12 LASRT15 Transitions Supply and Return Net Weight 30 Ibs 14 kg 32 Ibs 15 kg 36 Ibs 16 kg Controls Blower Proving Switch e COSWCHO001AE1 Commercial Controls See pages 34 39 Dirty Filter Switch e COSWCHOAE1 Smoke Detector Supply LTSASDK10 36 Smoke Detector Return LTARSDK10 30 Cooling PVC Condensate Drain Trap LTACDKP09 36 Accessories Copper Condensate Drain Trap LTACDKC09 36 Corrosion Protection Factory installed option Economizer Economizer Net Weight LAREMD10 15 47 Ibs 21 kg Economizer Outdoor Air Hood Net Weight LAOAH 10 15 11 Ibs 5 kg Number and Size of Filters 2 16 x 25 x 1 in 406 x 635 x 25 mm Enthalpy Control Kit Differential C1SNSRO7AE E
107. e removed indi vidually for service Burner maintenance and service is detailed in the SERVICE CHECKS sections of this manual TYPICAL GAS BURNER ASSEMBLY BURNER BURNERS SUPPORT CAP SUPPORT ORIFICE FIGURE 21 Orifice Each burner uses an orifice which is precisely matched to the burner input The orifice is threaded into the burner manifold The burner is supported by the orifice and will easily slide off for service NOTE Do not use thread sealing compound on the orifices Using thread sealing compound may plug the orifices Each orifice and burner are sized specifically to the unit Refer to Lennox Repair Parts Listing for correct sizing infor mation 4 Primary High Temperature Limit S10 10 is the primary high temperature limit for gas heat S10 is located on the blower deck behind the blower Primary limit 510 is wired to the main control panel A55 which energizes burner control Its N C contacts open to de energize the ignition control when excessive tempera ture is reached in the blower compartment At the same time the contacts of 510 close energizing the blower relay coil K3 through control A55 Limit S10 in all gas heat units is factory preset to open at 170 F 6 F 76 3 3 C on a temperature rise and automatically reset at 140 F 7 F 60 3 9 on a temperature fall 5 Flame Rollout Limit S47 Flame rollout limit S47 is a SPST N C high temperature limit located just abo
108. e used be sure to keep within the service factor limitations outlined on the motor nameplate Page 29 LGA LCAO088 4 100 PARTS ARRANGEMENT EVAPORATOR FILTERS COIL BLOWER FOUR 18 X 20 X 2 CONDENSER FAN ECONOMIZER OPTIONAL CONDENSER COIL A55 M1 MAIN CONTROL BOARD DISCONNECT OPTIONAL SOME MODELS BLOWER 1 MOTOR CONDENSATE Wi T BURNER ASSEMBLY DRAIN GAS VALVE LGA ONLY LCA MAY HAVE COMPRESSORS LGA ONLY OPTIONAL ELECTRIC HEAT FIGURE 1 LHA088 PARTS ARRANGEMENT BLOWER FILTERS INDOOR COIL FOUR 18 X 20 X 2 OUTDOOR FAN ECONOMIZER OPTIONAL OUTDOOR COIL COMPRESSOR BLOWER MOTOR CONDENSATE DRAIN ELECTRIC HEAT OPTIONAL DISCONNECT OPTIONAL SOME MODELS FIGURE 2 Page 30 090 102 120 8 150 PARTS ARRANGEMENT EVAPORATOR BLOWER COIL FILTERS CONDENSER FOUR 18 X 24 X 2 FAN ECONOMIZER OPTIONAL A55 M1 E CONDENSER MAIN CONTROL E 3 d m COIL BOARD OPTIONAL DISCONNECT OPTIONAL SOME MODELS BI OMER GAS VALVE BURNER ASSEMBLY LGA ONLY LCA MAY HAVE OPTIONAL ELECTRIC HEAT COMPRESSORS FIGURE 3 LHAO090 102 120 150 PARTS ARRANGEMENT INDOOR COIL FILTERS FOUR 18 X 24 X 2 OUTDOOR FAN BLOWER ECONOMIZER OPTIONAL OUTDOOR COIL CONDENSATE UE 4 1 BLOWER DRAIN b ELECTRIC GFCI H
109. equired if the unit has been in heating mode the IMC has been reset or at initial unit start up ECTO 4 24 option 5 3 System must NOT be operating in heating mode 4 One cooling demand is required if the unit has been in heating mode the IMC has been reset or at initial unit start up ECTO 4 24 option 7 3 System must NOT be operating in heating mode Once the corresponding conditions are met in each mode reheat will operate as shown in table 44 TABLE 44 Reheat Operation Two Cooling Stages Default T stat and Hu midity Demands Reheat Only Compressor 1 Reheat Operation Reheat amp Y1 Compressor 1 Reheat 8 Compressor 2 Cooling Compressor 1 Cooling amp Reheat Le Compressor 2 Cooling If there is no reheat demand and outdoor air is suitable free cooling will operate there is no reheat demand and outdoor air is suitable free cooling and compressor 1 will operate Additional Cooling Stages Units are shipped from the factory to provide two stages of cooling ECTO 5 04 option 2 and 6 01 option 0 Three stages of cooling is available in zone sensor mode ECTO 6 01 set to option 1 2 or 3 Three stages of cooling is also available by installing a transfer relay and a three stage thermostat ECTO 5 04 must be set to option 3 Reheat will operate as shown in table 45 TABLE 45 Reheat Operation Three Cooling Stages T stat and Humidity Demands Reheat Only Compressor
110. erate without icing the evaporator coil and losing capacity 5 Low Pressure Switches S87 and S88 The low pressure switch is an auto reset SPST N O switch held N C by refrigerant pressure which opens on a pressure drop All LGA LCA LHA units are equipped with this switch The switch is located in the compressor suction line 587 and S88 are wired directly to the main control mod ule A55 Units charged with R 22 When suction pressure drops to 25 5 psig 172 34 kPa indicating low pressure the switch opens and the com pressor is de energized The switch automatically resets when pressure in the suction line rises to 55 5 psig 379 34 kPa due to many causes such as refrigerant being added Units charged with R 410A When suction pressure drops to 40 5 psig 276 34 kPa indicating low pressure the switch opens and the compressor is de energized The switch automatically resets when pressure in the suction line rises to 90 5 psig 620 34 kPa due to many causes such as refriger ant being added The main control module A55 governs the low pressure switches by shunting the switches during start up until pressure is stabilized After the shunt period the control has a three strike counter during first thermostat demand before the com pressor is locked out The control is reset by breaking and re making the thermostat demand 6 Service Valves optional on LGA LCA units LGA LCA units may be equipped
111. erating immediately upon receiving a thermostat demand and is de energized immediately when thermostat demand is satisfied The combustion inducer uses 208 230V single phase PSC motor and a 4 81in x 1 25in 122mm x 32mm inducer wheel The motor operates at 3200RPM and is equipped with auto reset overload protection Blowers are supplied by vari ous manufacturers Ratings may vary by manufacturer Specif ic inducerelectrical ratings can be found on the unit rating plate All combustion air inducer motors are sealed and cannot be oiled The inducercannot be adjusted but can be dis assembled for cleaning 8 Combustion Air Motor Capacitor C3 The combustion air inducermotor in all LGA units re quires a run capacitor Capacitor C3 is connected to combustion air inducerB6 All capacitors are rated at 3 MFD and 370VAC 9 Gas Valve GV1 Gas GV1 is a two stage redundant gas valve used all LGA units Units are equipped with valves manufactured by White Rodgers or Honeywell For both valves first stage low fire is quick opening on and off in less than 3 seconds For the WhiteRodgers valve second stage is slow opening on to high fire pressure in 40 seconds and off to low fire pressure in 30 seconds Second stage for the Honeywell valve is quick opening and close On a call for first stage heat low fire the valve is energized by the ignition control simultaneously with the spark electrode On a call for second sta
112. es to energize condens er fan relay 10 LGA LCA102 120 150 only A57 ener gizes condenser fan relay K68 contacts K10 1 close energizing condenser fan B4 and N C contacts K10 2 open de energizing compressor crankcase heaters HR1 and HR2 N O contacts K68 1 close energizing condenser fan B5 2nd Stage Cooling compressor B2 is energized 12 13 14 Page 80 Second stage cooling demand energizes Y2 24 is routed through TB34 to compressor 2 module 57 A57 proves low pressure switch S88 freezestat S50 and N C high pressure switch S7 com pressor contactor K2 is energized N O contacts K2 1 close energizing compressor B2 LGA088 090 100 102 120 150 GAS HEAT UNIT WIRING DIAGRAM 1 1 810 810 510 0 DENOTES OPTIONAL COMPONENTS DESCRIPTION KEY COMPONENT JCONTROL BURNR ASS PANEL IN CAPACITOR COMB AIR BLOWER MOTOR Feo MUSE 30C LOW AMBIENT RTT S0C TON ABEN IT 3 50 LOW AMBIENT KIT J29 _ _ CGA SOC LOW AMBIENT KIT OPTIONAL T3 amp T20 USED ON 460V amp 575V UNITS ONLY USED ON 6 TON AND SMALLER UNITS N 510 521 HOOKUP FOR O36 TO 072 UNITS 810 HOOKUP FOR 090 TO 150 UNITS WIRING DIAGRAM 10 01 COMBINATION UNIT ROOFTOP GAS HEAT FOR L SERIES m THRU 235 UNITS eee SECTION A Al eu U S A
113. ew Form No 532 638W Litho U S A 1998 Lennox Industries Inc Page 78 LGA LCAO090 102 120 150 UNIT WIRING DIAGRAM 24 POWER DESCRIPTIUN COMPONENT PANEL MAIN 5 PANEL ECUNUMIZER KEY E UE PANEL COMPRESSOR 2 ____ HRI HEATER CHMPRESSUR COMPRESSOR 1 HRI HERTER CUMPRESSUR po 5 5 HEATER CDMPRESSUR 2 PONE RESSIR 2 Uti JACK GFI RECEPTACLE MITUR DUTDDUR FAN 1 JACK EXHAUST LUMPT MOTOR DUTDOOR FAN 2 MOTOR EXHAUST FAN 1 DT CAPACITOR OUTDOOR FAN 1 ACK DUT FAN 2 CAPACITDR DUTDDUR 2 CAPACITOR EXHAUST FAN 1 J114 N s 11 DUTPUT CIRCUIT BREAKER TRANS PLS P14 G SENSOR INPUT A55 R amp COUL 1 CONTROL INPUT IZER OUTPUT ESSUR 2 HAUST FAN MOTOR R CUMPRESSOR 1 R CDMPRESSUR 2 BLOWER DOR FAN ST 1 DR FAN T FAN il IP L INPUT CooL 1 CONTROL INPUT ZER SSUR e AUST FAN MOTOR HI PRESS CUMP 1 HI PRESS CUMP 2 L 5 0 AMB KIT N ELAY BLOWER 380 420V DISCONNECT 0 240 50 1 E 2 LOW PRESS LUW
114. f K10 fan relay to low ambient pressure switch S11 11 A55 proves N C low pressure switch S87 N C freezestat 549 and N C high pressure switch S4 to energize com pressor contactor K1 12 N O contacts K1 1 close energizing compressor B1 13 24VAC is routed through N O low ambient pressure switch S11 now closed and N C low ambient contact K58 1 now open to energize outdoor fan contactor K10 14 N O contacts K10 1 close energizing outdoor fan B4 and N C contacts K10 2 open de energizing crankcase heat ers HR1 and HR2 Second Stage Cooling Demand compressor B2 15 Second stage cooling demand energizes Y2 and G in the thermostat G energizes blower see step 3 16 24VAC is routed through TB34 to the heat pump control module A61 17 Heat pump control A61 proves N O defrost switch S9 and N C defrost termination switch S46 to energize reversing valve L2 and low ambient relay K118 18 N C contacts K118 1 open giving control of K68 fan relay to low ambient pressure switch S84 19 A61 proves N C low pressure switch S87 N C freezestat 550 and N C high pressure switch S7 to energize com pressor contactor K2 20 N O contacts K2 1 close energizing compressor B2 21 24 is routed through N O low ambient pressure switch S84 now closed to energize outdoor fan contactor K68 22 N O contacts K68 1 close energizing outdoor fan B5 First Stage Heat compressors B1 and B2 23 Heating demand energizes W1
115. ficiency Type Standard S Compressors Rated load amps each total 13 5 T 9 6 7 13 5 0 28 8 10 8 2 LCA LGA jo lated ramps 5 Outdoor Paas 30 15 12 3 72 FanMotor Tockedrotoramps 60 50 25 e 2151212121512 3 Rr 22 5 22 Motor amps 75 75 35 Locedrotramps f 465 165 66 204 268 162 254 Rec fuse With Exhaust Fan _______50 70 25 size amps _ Tess ExhaustFan 50 70 25 Minimum W nExmautFan 44 45 20 Circuit Ampacity TessExhaustFan 47 19 No Horsepower 1 1 3 249 Power Fulloadamps 24 no y o f TO Locked rotor amps 47 21 357 T9 Service Outlet 2 115 volt GFCI amp rating 15 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus and nus 10 of line voltage NOTE Where current does not exceed 100 amps type circuit breaker may be used in place of fuse U S only Page 16 ELECTRIC HEAT ELECTRICAL DATA 7 5 TON HIGH EFFICIENCY R 22 LCA LGA090H2 Voltage 60hz 3 phase 208 230V 3ph 460V 3ph 575V 3ph Compressors Rated Load Amps each total 12 4 24 9 6 4 12 8 4 8 9 6 Locked Rotor Amps each total 88 176 44 88 34 68 Outdoor Fan Fu
116. ge heat high fire the second stage operator is energized directly from A55 The WhiteRodgers valve is adjustable on high fire only The Honeywell valve is adjustable for both high and low fire A manual shut off knob is provided on all valves for shut off Manual shut off knob immediately closes both stages without delay Figure 22 shows White Rodgers gas valve components Table 4 shows factory gas valve regulation for LGA series units Page 47 WHITE RODGERS 36C76 GAS VALVE MANIFOLD PRESSURE TAP SIDE STAGE 2 MANUAL MANIFOLD INLET PRESSURE ADJUSTMENT PRESSURE TAP SIDE SCREW UNDER CAP GAS VALVE e SHOWN IN OFF HONEYWELL VR8305 VR8205 GAS VALVE GAS VALVE SHOWN HIGH FIRE IN OFF POSITION ADJUSTMENT LOW FIRE ADJUSTMENT MANIFOLD PRESSURE TAP PRESSURE TAP FIGURE 22 TABLE 4 GAS VALVE REGULATION FOR LGA UNITS Operating Pressure outlet factory setting CC ____ Maximum Inlet Pres LP 13 0 W C 3232Pa 1 6 0 2 3232Pa 5 55503 105405 Sep 1368 261 75 124Pa 10 Spark Electrodes An electrode assembly is used for ignition spark The electrode is mounted through holes on the left most end of the burner support The electrode tip protrudes into the flame envelope of the adjacent burner The electrode as sembly is fastened to burner supports and can be removed for service without removing any part of the burners During igniti
117. hanced fins and rifled tubing In all units each compressor is protected by a crankcase heater high pressure switch and low pres sure switch Additional protection is provided by low ambient switches and freezestats on each evaporator stage 1 Compressors B1 and B2 See table 2 for compressor type and quantity Compressors are supplied by various manufacturers and are equipped with independent cooling circuits Compressor electrical specifications vary by model See compressor nameplate for specifications WARNING Electrical shock hazard Compressor must be grounded Do not operate without protective cover over terminals Disconnect power before removing protective cover Discharge capacitors before servic ing unit Failure to follow these precautions could cause electrical shock resulting in injury or death Each compressor is energized by a corresponding com pressor contactor NOTE Refer to the wiring diagram section for specific unit operation TABLE 2 mum 2 LGA LCA090 102 LGA LCA102 120S Reciprocating LGA LCA150S 1 Reciprocating LGA LCA150S 2 2 Crankcase Heaters HR1 and HR2 All units with scroll compressors and all LHA units use belly band type crankcase heaters while all LGA LCA units with reciprocating compressors use insertion type heaters Heater HR1 is used on compressor B1 and heater HR2 is used on compressor B2 Crankcase heater wattage varies by compressor man
118. hermostat mounting box is installed on the vesti bule of the heating compartment Included in the box are the following thermostat switches Page 72 a Thermostat switch 559 is an auto reset SPST Switch which acts as a low limit and opens on a tem perature drop The switch is wired to open 24v power to the burner control When the temperature drops be low 35 C 30 F the switch opens and the gas heat section is de energized The switch automatically resets when the heating compartment temperature reaches 12 C 10 F b Thermostat switch S60 is an auto reset SPST Switch and is the controller of HR6 When the tem perature rises above 7 C 20 F the switch opens and the electric heater is de energized The switch automatically resets when the heating compartment temperature reaches 23 3 C 10 F c Thermostat switch S61 is an auto reset SPST switch which acts as a high limit and closes ona temperature drop S61 remains closed during low ambient conditions and opens when tempera tures rise When temperature drops below 6 7 C 20 F the switch closes The switch automatical ly opens when heating compartment temperature reaches 24 C 76 F I Control Systems Three different types of control systems may be used with the LGA LHA series units All thermostat wiring is connected to terminal block TB1 located in the control box of the unit Each thermostat has additional control options available See
119. hten two bolts on other side of base BELT TENSION ADJUSTING BOLT TURN CLOCKWISE TO TIGHTEN BELT REMOVE SCREWS FROM BOTH SIDES BEFORE SLIDING BLOWER ASSEMBLY OUT OF UNIT IN PLACE BLOWER MOTOR MOUNTING FRAME BLOWER MOTOR BASE MOTOR BASE ADJUSTMENT SCREWS 2 EACH SIDE TO INCREASE CFM LOOSEN ALLEN SCREW amp TURN PULLEY CLOCKWISE TO DECREASE CFM TURN PULLEY COUNTERCLOCKWISE FIGURE 14 Page 43 HEAT EXCHANGER SUPPORT HEAT EXCHANGER INDUCED COMBUSTION AIR BLOWER TRANSITION HEAT EXCHANGER BAFFLE INSHOT BURNERS FLAME SENSOR ELECTRODE ORIFICE FIGURE 15 lt COMBUSTION AIR INDUCER BURNER Dy Ca Uu U 0 g a 2 o COMBUSTION AIR INDUCER MOTOR B6 d COMBUSTION AIR INDUCER CAPACITOR C3 FLAME ROLLOUT LIMIT S47 IGNITOR ELECTRODE gt FIGURE 16 Page 44 D GAS HEAT COMPONENTS LGA units LGA088 100 units are available in 125 000 BTUH 36 6 kW standard heat or 180 000 BTUH 52 7 kW high heat sizes LGA090 102 120 and 150 units available in 130 000 BTUH 38 1 kW standard heat and 235 000 BTUH 68 8kW high heat sizes with some units available in 180 000 52 7 kW medium heat Unit nameplate will list Btuh capacities 1 Burner Ignition Control A3 The ignition control is located below the control box Three dif ferent manufacturers Fenwal Johnson Controls and RAM cont
120. ient Kit C G A 50 C Low Ambient Kit 13 Line voltage or transformer T20 in 460V and 575V only is routed through the low ambient kit fuses F20 and N C low ambient kit thermostats S60 and S61 to energize low ambient kit heater HR6 Page 82 LHA088 UNIT WIRING SCHEMATIC 24V POWER IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING AND INSULATION THICKNESS DESCRIPTION COMPONENT DISCONNECT ALL POWER BEFORE SERVICING PANEL MAIN NOTE FOR USE WITH COPPER CONDUCTORS PANEL ECONOMIZER ONLY REFER TO UNIT RATING PLATE COMPRESSOR FOR MINIMUM CIRCUIT AMPACITY AND MOTOR BLOWER MOTOR OUTDOOR FAN MAXIMUM OVERCURRENT PROTECTION SIZE MOTOR EXHAUST FAN CAPACITOR OUTDOOR FAN CAPACITOR BLOWER MOTOR CAPACITOR EXHAUST FAN CIRCUIT BREAKER TRANS TI HEATER COMPRESSOR JACK GFI RECEPTACLE JACK JACK EXHAUST FAN JACK MOTOR SPEED CHANGE JACK BLOWER MOTOR JACK OUTDOOR JACK BLOWER DECK JACK GAS OUTPUT JACK COOLING SENSOR INPUT JACK BLOWER amp COOL CONTROL JACK SENSOR INPUT JACK ECONOMIZER OUTPUT JACK BLOWER EXHAUST FAN JACK BLOWER OVERRIDE STD CONTACTOR COMPRESSOR CONTACTOR BLOWER RELAY OUTDOOR FAN RELAY LOW AMBIENT KIT RELAY EXHAUST FAN VALVE REVERSING PLUG PLUG EXHAUST FAN PLUG MOTOR SPEED CHANGE PLUG BLOWER MOTOR IPLUG QUTDOOR PLUG BLOWER DECK PLUG GAS OUTPUT PLUG COOLING SENSOR INPUT PLUG BLOWER amp COOL CONTROL PLUG SENSOR
121. ifold Attachment and Charging sec tions in this manual F Electrical 1 Check all wiring for loose connections 2 Check for correct voltage at unit unit operating 3 Check amp draw on both condenser fan motor and blower motor Fan Motor Rating Plate Actual Indoor Blower Motor Rating Plate Actual Page 69 VII ACCESSORIES The accessories section describes the application of most of the optional accessories which can be factory or field installed to either the LGA LCA LHA units OPTIONAL FIELD INSTALLED ACCESSORIES section see table of contents show specific size per unit A LARMF Mounting Frames When installing either the LGA LCA LHA units on a combus tible surface for downflow discharge applications the Lennox LARMF08 10 or 10 15 14 inch or 24 inch 356 mm or 610mm height roof mounting frame is used The roof mounting frames are recommended in all other applications but not required If the LGA LHA units are not mounted on a flat roof sur face they MUST be supported under all edges and under the middle of the unit to prevent sagging The units MUST be mounted level within 1 16 per linear foot or 5mm per meter in any direction ASSEMBLED ROOF MOUNTING FRAME 25 E CROSS SUPPORT SUPPLY AIR FIGURE 33 The assembled LARMF mounting frame is shown in figure 33 Refer to the roof mounting frame installation instructions for de tails of proper assembly and mounting
122. ing 4 Compressor 1 reheat is in operation and a Y2 cool ing demand is initiated Compressor 1 does not de energize L14 reheat valve is de energized for compressor 1 cooling and compres sor 2 is energized for 2nd stage cooling 5 Compressor 1 reheat and compressor 2 cooling are in operation Y1 demand and outdoor air is suitable for free cooling then reheat demand is satisfied Free cooling is energized and both com pressors are de energized Page 76 24 VOLT FIELD WIRING WITH IMC SET IN LOCAL THERMOSTAT MODE ECTO 6 01 OPTION 0 JUMPER TERMINALS 8 amp 9 WHEN THERMOSTAT HAS NO Note On electro mechanical ther NIGHT SETBACK TERMINALS mostats set anticipator at 0 1 amps 819 101112131415 1617 18 19 2021 22202252244 NOT ALL TERMINALS ARE FOUND ON ALL THERMOSTATS 4 1 0 GND te te VIN HUMIDITY SENSOR Connect shield drain to unit TB1 7 A2 THERMOSTA FIGURE 40 24 VOLT FIELD WIRING IN ZONE SENSOR MODE ECTO 6 01 OPTION 1 2 OR 3 TB1 8 9 10 1112 13 14 15 16 17 19 2021 Connect shield drain to unit TB1 16 Terminals are located on combination RH temperature sensors only A2 sensor is not required when combina tion sensor is used A91 HUMIDITY SENSOR Connect shield drain to unit TB1 7 FIGURE 41 Page 77 460V OR TRANSFO 220 240 50 1 23 N 380 420 VIII WIRING DIAGRAMS SEQUENCE OF OPERATION
123. inimum Model No of Input Output circuit A red amp Net Weight Steps P put Circuit Ampacity 2 hp 3 hp 1 5 KW 2 2 kw 2 KW 208 56 79 700 1230 89 23800 1808 1 40 69 21500 5754 aam i7 eg 55 65 25800 77 6 75 25800 T 20250 16111 460v 16L12 1 460 13 8 47 100 575v 16113 480 150 51200 89 150 51200 08 20 32L95 2195 IE e V 38 Ibs 17 kg Sech e 225 7800 E x bat 3 4 o gt N A 208 EX 230 275 93200 900 100 30 732 240 30 0 102 400 208 230v 22 240 30 0 102 400 16L14 5 s V 2 m 32 600 309 102400 22 230 41 3 141 000 148 152 100 45 32 240 45 0 153 600 208 230v 22 240 45 0 153 600 16117 16118 ot CG 600 450 15300 NOTE H indicates high efficiency units S indicates standard efficiency units TRefer to National or Canadian Electrical Code manual to determine wire fuse and dis connect size requirements Use wires suitable for at least 167 F 75 be used with two stage control NOTE Fuse block must be ordered extra Factory installed heaters will have the fuse block factory installed Fuse block must be installed in unit with field installed heaters Also requires LTB2 Termin
124. ip distributes 24V power and common from the thermostat to the control box components TB13 termi nal strip distributes line voltage power to the line voltage items in the unit TB34 terminal strip distributes 24V pow er from T1 to the control box components 5 Unit Fuse Block amp Fuses F4 amp LCA units Three line voltage fuses F4 provide short circuit and ground fault protection to all cooling components in the LHA and LCA units with electric heat The fuses are rated in accordance with the amperage of the cooling components 6 Outdoor Fan Capacitor C1 and C2 Fan capacitors C1 and C2 are 370V 10MF capacitors used to assist in the start up of condenser fan motors B4 and B5 Capacitor ratings will be on outdoor fan motor nameplate 7 Compressor Contactor K1 amp K2 All compressor contactors are three pole double break contactors with a 24VAC coil In all LGA LCA LHA units K1 energized by A55 and K2 energized by A57 or A61 ener gize compressors B1 and B2 respectively in response to first or second stage cooling demands 8 Blower Contactor K3 Blower contactor K3 used in all units is a three pole double break contactor with a 24VAC coil used to energize the indoor blower motor B3 in response to blower demand K3 is ener gized by main control panel A55 9 Outdoor Fan Relay K10 and K68 Outdoor fan relay K10 and K68 are DPDT relays with a 24 coil K10 energized by A55 and K68 energized by 57 or A61
125. istics 208 230v 460v or 575v 60 hertz 3 phase i Rated in accordance with ARI Standard 210 240 and certified to ARI 95 F 35 C outdoor air temperature and 80 F 277 db 67 F 19 C wb entering evaporator air minimum external duct static pressure 2 Sound Rating Number rated in accordance with test conditions included in ARI Standard 270 3JFor LPG Propane units a field conversion kit is required and must be ordered extra 4 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished by Lennox are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate 5 Integrated Part Load Value rated at 80 F 27 C outdoor air temperature NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction Blower wheel nominal dia x width in mm Nominal motor output hp KW 2 hp 1 5 kW Max usable motor output hp KW Evaporator 4 Motor amp Drives Voltage amp phase Blower Drive kit RPM range and Drive Selection Nominal motor horsepower kW 3 hp 2 2 kW Max usable motor output hp kW 4
126. ithout disconnect circuit breaker but with single point power source Page 14 OPTIONAL ELECTRIC HEAT ACCESSORIES 1 090 150 ELECTRIC HEAT CONTROL MODULE AND UNIT FUSE BLOCKS Unit Model No LHA090H LHA102H LHA120H LHA150S Electric Model No EHA see Electric Heat Data tables for additional information Heat kW Input Range 7 5 15 22 5 30 45 15 22 5 30 45 60 Electric Heat Control Module 45 60 90 kW Unit With 2 hp 1 5 208 230V 56K93 56K94 56K95 56 95 Fuse Power 460V 3ph 56K52 25K08 25K09 25K09 Block Exhaust 56K52 Fans 575V 3ph 56K51 56K51 56K52 3 units 25K08 2 2 kW 208 230V 56K93 56K94 56K95 56K96 460V 3ph 56K52 25K08 25K09 25K09 575V 3ph 56K51 56K51 56K52 25K08 5 hp 3 7 kW 208 230V 3ph 56K94 56K95 56K96 56 96 460V 3ph 25K08 25 09 25 10 25 10 575V 3ph 56K52 56K52 25 08 25 08 7 5 56 kW 208 230 3ph SE EI 460V 3ph Sey 255 SES 575V 3ph 223 ct 10 7 5 kW 208 230 3ph Wes RES m 460V 3ph ks E ec 575V 3ph ze jus re Without 2 1 5 kW 208 230V 3ph 56K93 56K94 56K94 56 95 Power 460V 3ph 56K52 56K52 25K09 25K09 Exhaust 56K52 Fans 575V 3ph 56K51 56K51 56K52 3 units 25K08 3 2 2 kW 208 230V 56K93 56K94 56K95 56 96 460V 3ph 56K52 25K08 25K09 25K09 575V 3ph 56K51 56K51 56K52 5 hp 3 7 kW 208 230V 3ph 56K94 56K95 56K95 56K96 460V 3ph 25K08 25 08 25 0
127. l Tube diameter in mm 3 8 9 5 3 8 9 5 Number of rows 3 3 Fins per inch m 14 551 14 551 Condensate Drain number and size 1 1 in NPT coupling 1 1 in NPT coupling Expansion device type Balanced Port Thermostatic Expansion Valve removeable power head Indoor Belt Drive Nominal motor output 2 hp 22 KW 2 hp 1 5 kW Blower and 3 hp 2 2 kW 3 hp 2 2 kW Drive 5 hp 3 7 kW 5 hp 3 7 kW Selection Maximum usable output 2 3 hp 1 7 kW 2 3 hp 1 7 kW Only 3 45 hp 2 6 kW 3 45 hp 2 6 kW 5 75 hp 4 3 kW 5 75 hp 4 3 kW Motor Drive kit 2h 2 Wheel nominal diameter x width in mm Filters Type of filter Number and size in mm Electrical characteristics kit 1 680 P 925 rpm kit 3 895 1120 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 6 1110 1395 rpm 5 hp kit 4 895 1120 rpm kit 6 1110 1395 rpm 1 15 x 15 881 x 381 4 18 x 24 x 2 457 x 610 x 51 208 230V 460V or 575V 60 hertz 3 phase kit 1 680 925 rpm kit 3 895 1120 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 3 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 46 1110 1395 rpm 5 hp kit 4 895 1120 rpm kit 6 1110 1395 rpm 1 15 x 15 381 x 381 Disposable pleated MERV 7 standard or MERV 11 optional NOTE Net capacity includes evaporator
128. ll Load Amps each total 24 4 8 1 3 2 6 1 0 2 0 Motors 2 Locked Rotor Amps each total 4 7 9 4 2 4 4 8 1 9 3 8 Power Horsepower 1 3 249 1 3 249 1 3 249 Exhaust Fan Full Load Amps 24 1 3 1 0 Locked Rotor Amps 4 7 24 1 9 Service Outlet 115V GFI 15 Amps Indoor Horsepower 5 2 3 5 Blower Motor Rated Load Amps 7 6 27 3 9 6 1 Locked Rotor Amps 45 6 16 2 234 36 6 1 Maximum Unit only 25 Overcurrent Protection with power 0 kW 25 exhaust 5 kW 25 15 kW 30 22 5 kW 40 30 kW 45 45 kW 70 Minimum Unit only 41 44 19 roe with power 0 KW 20 A mpaetty exhaust 7 5 kW 20 15 kW 27 22 5 kW 36 30 kW 45 45 kW 59 61 63 Unit Fuse Unit only 56 93 56K93 56K94 25K08 56K52 Block with power exhaust 56K93 56K93 56K94 25K08 56K52 Disconnect 0 15 kW 84M13 84M13 84M13 84M13 84M13 84M13 84M13 84M13 22 5 kW 84M13 84M13 84M14 84M13 84M13 84M13 84M13 84M13 30 45 kW 84M14 84M14 84M14 84M13 84M13 84M13 84M13 84M13 Terminal Block 30K75 NOTE Extremes of operating range are plus and minus 1096 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 17 ELECTRIC HEAT ELECTRICAL DATA 7 5 TON HIGH EFFICIENCY R 410A LCA LGA090H4 Voltage 60hz 3 phase 208 230V 3ph 460V 3ph 575V 3ph Rated Load Amps each total 14 6 29 2 7 1 14 2 5 1 10 2
129. llowing is a generalized procedure and does not apply to all thermostat control systems 1 Blower operation is dependent on the thermostat control system option that has been installed in the LGA LCA LHA units Refer to operation sequence of the control system installed for detailed descriptions of blower operation 2 Generally blower operation is set at the thermostat fan Switch With the fan switch in ON position and the OCP input is the blower operates continuously With the fan switch in AUTO position the blower cycles with demand 3 n most cases the blower and entire unit will be off when the system switch is in the OFF position The only excep tion is immediately after a heating demand when the blow er control keeps the blower on until all heat is extracted from the heat exchanger Determining Unit Air Volume 1 The following measurements must be made with a dry in door coil Run blower without cooling demand Air filters must be in place when measurements are taken 2 With all access panels in place measure static pres sure external to unit from supply to return 3 Measure the indoor blower wheel RPM 4 Refer to BLOWER DATA section and use static pressure and RPM readings to determine unit air volume 5 The RPM can be adjusted at the motor pulley Loosen len screw and turn adjustable pulley clockwise to increase RPM Turn counterclockwise to decrease RPM See figure 14 Page 42
130. m and motor output required Maximum usable output of motors furnished are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the Page 7 SPECIFICATIONS LHA General Nominal Tonnage 12 Ton 12 5 Ton Data Model No LHA150 3S2B LHA150S2B Efficiency Type Standard S Standard S Cooling Gross Cooling Capacity Btuh kW 145 200 42 6 144 000 42 2 Performance 1 Net Cooling Capacity Btuh kW 138 000 40 4 137 000 40 1 ARI Rated Air Flow cfm L s 4200 1980 4400 2075 Total Unit Power kW 14 8 14 2 1 EER Btuh Watt 9 3 9 7 2 Integrated Part Load Value Btuh Watt 10 5 10 9 Refrigerant Charge Circuit 1 11 Ibs 8 oz 5 2 kg 12 Ibs 0 oz 5 4 kg Furnished R 22 Circuit 2 11 Ibs 8 oz 5 2 kg 12 Ibs 0 oz 5 4 kg 3Sound Rating Number dB 88 88 Heating 1 Total High Heating Capacity Btuh 139 000 39 9 140 000 41 0 Performance Total Unit Power KW 12 9 12 4 1 C O P 3 1 3 3 1 Total Low Heating Capacity Btuh 80 000 23 4 80 000 23 4 Total Unit Power KW 11 7 11 7 1 C O P 2 0 2 0 Compressor Number amp Type 2 Scroll 2 Scroll Outdoor Net face area sq ft m2 29 3 2 72 total 29 3 2 72 total Coil Tube diameter in mm 3 8 9 5 3 8 9 5 Number of rows 2 2 Fins per inch m 20 787 20 787 Outdoor Motor horsepower W 2 1 2 373 2 1 3 249 Fans Motor rpm 1075 1075
131. nd Y2 will energize com pressor B2 Refrigerant circuit is factory charged with R 22 refriger ant See unit rating plate for correct amount of charge 1 Page 64 D Heating Startup LGA FOR YOUR SAFETY READ BEFORE LIGHTING Electric shock hazard Can cause injury or death Do not use this furnace if any part has been under water Immediately call qualified service technician to in We spect the furnace and to replace any part of the control system and any gas control which has been under water Danger explosion Can cause injury product or property damage If over heating occurs or if gas supply fails to shut off shut off the manual gas valve to the appliance before shutting off electri cal supply BEFORE LIGHTING smell all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor Use only your hand to push in or turn the gas control knob Never use tools If the knob will not push in or turn by hand do not try to repair it call a qualified service technician Force or attempted repair may result in a fire or explosion Danger of explosion Can cause injury or death Do not attempt to light manually Unit has a direct spark ignition system This unit is equipped with an automatic spark ignition sys tem There is no pilot In case of a safety shutdown move thermostat switch to OFF and return the thermostat switch to H
132. nergizing ex haust fan motor B10 Cooling Demand 7 First stage cooling demand energizes Y1 and in the thermostat G energizes blower see step 3 8 24VAC is routed through TB34 to the main control module A55 9 A55 proves N O defrost switch S6 and N C defrost ter mination switch S46 to energize reversing valve L1 and low ambient relay K58 10 N C contacts K58 1 open giving control of K10 fan relay to low ambient pressure switch S11 11 A55 proves N C low pressure switch S87 N C freezestat 549 and N C high pressure switch S4 to energize com pressor contactor K1 12 N O contacts K1 1 close energizing compressor B1 13 24VAC is routed through N O low ambient pressure switch S11 now closed and N C low ambient contact K58 1 now open to energize outdoor fan contactor K10 14 N O contacts K10 1 close energizing outdoor fan B4 and N C contacts K10 2 open de energizing crankcase heater HR1 First Stage Heat 15 Heating demand energizes W1 in the thermostat 16 24VAC is routed through TB34 to the main control module A55 After A55 proves N C low pressure switch S87 N C high temperature limit S5 N C freeze stat S49 and N C high pressure switch S4 compressor contactor K1 is energized NOTE On first heating demand after unit has been in cooling mode module A55 will de energize reversing valve L1 and low ambient relay K58 K58 1 N C con tacts will take control away from low ambient pressure switch S11
133. ng cycle K118 is also energized opening K118 1 There fore K118 1 is always closed during heating demand by passing S84 This allows the fan to operate during heating demand and to cycle during cooling demand 12 Power Exhaust Relay K65 PED units Power exhaust relay K65 is a N O DPDT relay with a 24VAC coil K65 is used in all LGA LCA LHA units equipped with the optional power exhaust dampers K65 is energized by the economizer control panel A56 af ter the economizer dampers reach 5096 open adjust able in ECTO When K65 closes the exhaust fan B10 is energized 13 Blower Motor Overload Relay S42 units with high efficiency motors and 50hz models The blower motor overload relay is used in all L series units equipped with high efficiency motors and all 50hz motors The relay 542 is connected in line with the blower motor to monitor the current flow to the motor When the relay senses an over load condition a set of normally closed contacts open to de en ergize pin Z9 in plug P110 of the A55 main control module A55 de energizes all outputs The overload relay has an adjustable setting and is set per the nameplate current of the motor All units are equipped with a relay manufactured by Siemens fig ure 8 or Telemecanique figure 9 INTEGRATED MODULAR CONTROL BOARDS The Integrated Modular Control IMC is a series of control boards which integrates most control functions required for the LGA LCA LHA units The control
134. nits are equipped with two condenser fans with 1 3 hp mo tors The 086 100 units have one condenser fan and use 1 2 hp motors All motors are ball bearing type single phase motors and have a three pin plug for easy motor lead removal The fans may be removed for servicing and cleaning by removing the fan grilles C Blower Compartment The blower compartment in all LGA LCA LHA units is lo cated between the evaporator coil and the condenser coil sec tion The blower assembly is accessed by disconnecting the blower motor and all other plugs and removing the screws in front of the blower housing The blower pulls out as shown in figure 14 1 Blower Wheel all units All LGA LCA LHAO90 102 120 150 units have one 15 in x 15 in 381 mm x 381 mm blower wheel All LGA LCA LHA088 100 units have 12 in x 12 in 305 mm x 305 mm blower wheel 2 Indoor Blower Motor B3 all units All LGA LCA LHA units use three phase single speed blower motors CFM adjustments are made by adjusting the motor pulley sheave to adjust blower speed Motors are equipped with sealed ball bearings All motor specifications are listed in the SPECIFICATIONS section at the front of this manual Units may be equipped with motors manufactured by various manufacturers therefore electrical FLA and LRA specifications will vary See unit rating plate for information specific to your unit OPERATION ADJUSTMENT Blower Operation NOTE The fo
135. nthalpy Control Kit Outdoor C1SNSRO6AE Economizer Control Global e See Intelligent Unit Controller Features Engineering sensor must be field provided Handbook gt See Intelligent Unit Controller Features Engineering Economizer Control Sensible Hnadbook Barometig Down Flow Barometric Relat Wott LAGED10 15 8 Ibs 4 kg Hood for Down Flow LAGED LAGEH09 15 Horizontal Barometric Relief Dampers gt Net Weight LAGEDH03 15 8 Ibs 4 kg Damper Section down flow SOR LAOADM10 15 31 Ibs 14 kg Dampers Damper Section down flow Manual Net Weight LAOAD10 15 26 Ibs 12 kg Outdoor Air Hood OF Es LAOAH10 15 11 Ibs 5 kg Number and Size of Filters 2 16 x 25 x 1 in 406 x 635 x 25 mm Ex Power Exhaust Fan Net Weight LAPEF10 15 28 Ibs 13 kg Electrical Disconnect Switch Accessories Electric Heat HACR Circuit Breaker GFI Service Outlets Electric Heat Electric Heat LTB2 Terminal Block Electric Heat Fuse Block Filters MERV 11 High Efficiency Factory installed option LTAGFIK10 15 See Electric Heat Data Tables See Optional Electric Heat Accessories See Optional Electric Heat Accessories 97L86 18 x 24 x 2 order four per unit Indoor Air Quality CO2 Sensors Indoor Air Quality CO2 Sensors Standard Roof Curbs ClipLock 1000 Roof Curbs CO Sensor Duct Mounting Kit Sensor white case
136. olled requires Fuse Block and Terminal Block LHA LCA Models Electric Heat Fuse Block Required with Electric Heat Mounting screws furnished LCA LHA Models See Optional Electric Heat Accesso Electric Heat LTB2 Terminal Block Required with electric heat ries Table LCA LHA Models Automatic fully modulati Outdoor Air Damper Section Linked mechanical dampers 0 to 25 fixed Spring mE Gener motor LAOADM08 10 28 Ibs 13 kg outdoor air adjustable installs in unit for down flow applications outdoor air ith plug i ti hood must be ordered separately see below Net Weight eee See Electric Heat Data Tables LAOAD10 15 26 Ibs 12 kg Outdoor Air Hood Required with LAREMD08 10 Economizer LAOAD10 15 and LAOADM08 10 Outdoor EAQAHOS 10 E 5 kg Air Damper Sections two cleanable aluminum mesh fresh air filters furnished Net Weight 406 x 508 x 25 mm Model Number Net Weight LAPEF08 10 28 Ibs 13 kg Power Exhaust Fan Installs in unit for down flow applications only with econ Diameter in mm omizer option provides exhaust air pressure relief interlocked to run when re Number of Blades 20 508 5 turn air dampers are closed and supply air blower is operating fan runs when outdoor air dampers are 50 open adjustable motor is overload protected 1912 air volume cfm L s 4200 1980 0 in 0 Pa requires optional down flow gravity exhaust dampers see above
137. on spark travels through the spark electrode fig ure 23 and ignites the left burner Flame travels from burner to burner until all are lit The spark electrode is connected to the ignition control by a 8 mm silicone insulated stranded high voltage wire The wire uses 1 4 6 35 mm female quick connect on the electrode end and female spark plug type terminal on the ignition control end NOTE IN ORDER TO MAXIMIZE SPARK ENERGY TO ELECTRODE HIGH VOLTAGE WIRE SHOULD TOUCH UNIT CABINET AS LITTLE AS POSSIBLE IGNITOR SPARK lt SHOULD BE 1 8 3mm ees FIGURE 23 11 Flame Sensors A flame sensor is located on the right side of the burner support The sensor is mounted through a hole in the burn er support and the tip protrudes into the flame envelope of the right most burner The sensor assembly is fastened to burner supports and can be removed for service without removing any part of the burners When flame is sensed by the flame sensor indicated by microamp signal through the flame sparking stops imme diately During operation flame is sensed by current passed along the ground electrode located on the spark electrode through the flame and into the sensing elec trode The ignition control allows the gas valve to stay open as long as a flame signal current passed through the flame is sensed Page 48 E Optional Electric Heat Components See ELECTRIC HEAT CAPACITIES and ELECTRIC HEAT ELECTRICA
138. onnect the jumper between TB1 terminals 6 amp 18 Y1 to end the cooling demand 6 Press the IMC pushbutton to by pass the compressor minimum run delay Compressor 2 cooling should de energize compressor 1 reheat should continue to operate and L14 LED should still be ON 7 Disconnect the jumper between TB1 terminals 8 amp 9 occupied mode Compressor 1 reheat should de energize L14 LED should go OFF blower should still be energized 8 When check out is complete remove all jumpers set ECTO 4 25 back to the proper humidity set point and set ECTO 6 01 to the proper setting Page 75 TABLE 43 Relative Humidity 3 Sensor Output VDC 20 2 00 30 3 00 40 4 00 50 5 00 60 6 00 70 7 00 80 8 00 90 9 00 efault Reheat Operation Humiditrol unit reheat control parameter 4 24 is factory set to option 6 Reheat will operate as shown in table 44 once three conditions are met 1 Blower must be operating 2 System must be in occupied mode 3 System must NOT be operating in heating mode IMPORTANT Free cooling does not operate during re heat Free cooling will operate as shown in the IMC manu al Reheat Control Options Reheat control parameter 4 24 can be set to other reheat control operating conditions as follows see IMC manual ECTO 4 24 option 3 1 Blower must be operating 2 System must be in occupied mode 3 System must NOT be operating in heating mode 4 One cooling demand is r
139. ons included with transition for detailed installation procedures D LAOADMO08A0 10 15 and LAOD10 15 Outdoor Air Dampers Field or Factory Installed LAOADMO8 10 and 10 15 and LAOAD10 15 consists of dampers which may be manually or motor M operated to allow up to 25 percent outside air into the system at all times see figure 35 Washable filters supplied with the outdoor air dampers can be cleaned with water and a mild deter gent It should be sprayed with Filter Handicoater when dry prior to reinstallation Filter Handicoater is R P Products coat ing no 418 and is available as Lennox Part No P 8 5069 E LAREMDO08 10 and 10 15 Economizer Field or Factory Installed The optional LAREMD08 10 and 10 15 economizer can be used with LGA LHA units in downflow and horizon tal air discharge applications The 9 10 and 10 15 economizer uses outdoor air for free cooling when temperature and or humidity is suitable An economizer hood is required and must be ordered separately with the field installed econo mizer NOTE Gravity exhaust dampers are optional with econo mizers The economizer is controlled by the economizer control module A56 which connects to the main control module A55 Both boards are part of the Integrated Modular Control IMC which controls L series unit operation The economizer will operate in one of four modes Each mode requires a different EM1 economizer DIP switch set ting Each mode
140. or at least 167 75 3 HACR type breaker or fuse May be used with two stage control Page 59 AND INSTALLATION Make sure the unit is installed in accordance with the installation instructions and all applicable codes See accessories section for conditions requiring use of the optional roof mounting frame LARMF WARNING Do not exceed nameplate charge under any condition IMPORTANT Units equipped with Humiditro system MUST be charged standard cooling mode This unit is factory charged and should require no further adjustment If the system requires charge reclaim the charge evacuate the system and add required nameplate charge NOTE System charging is not recommended below 60 F 15 C In temperatures below 60 F 15 C the charge must be weighed into the system If weighing facilities are not available or to check the charge use the following procedure 1 Attach gauge manifolds and operate unit in cooling mode until system stabilizes approximately five min utes Make sure outdoor air dampers are closed 2 Check each system separately with all stages operat ing 3 Use a thermometer to accurately measure the outdoor ambient temperature 4 Apply the outdoor temperature to tables 16 through 37 to determine normal operating pressures 5 Compare the normal operating pressures to the pres sures obtained from the gauges Minor
141. ort cap figure 32 Slide each burner off its orifice Clean and reassemble reverse steps 1 3 Be sure to secure all wires and check plumbing Tum on power to unit Follow lighting instructions at tached to unit and operate unit in heating mode Check burner flames They should be blue with yellow streaks Page 67 8 Spark Electrode Gap The spark electrode assembly can be removed for inspection by removing two screws securing the electrode assembly and sliding it out of unit For proper unit operation electrodes must be positioned and gapped correctly Spark gap may be checked with appropriately sized twist drills or feeler gauges Disconnect power to the unit and remove electrode assembly The gap should be between 0 125 0 015 3 2 mm 4 mm See figure 23 BURNER BOX ASSEMBLY REMOVAL GAS MANIFOLD BURNER SUPPORT CAP BURNER SUPPORT ORIFICE ELECTRODE FIGURE 32 9 Heat Exchanger To Access or Remove Heat Exchanger From Unit Turn off gas and electric power Remove access panel s and unit center mullion Remove gas valve manifold assembly and burn ers Remove combustion air blower and flue box Pay careful attention to the order in which gaskets and ori fice are removed Support heat exchanger to prevent it from falling when final screws are removed Remove screws supporting heat exchanger To install heat exchanger reverse procedure Be sure to secure all wires and check plumbing and burner pl
142. ower company and have the voltage cor rected before starting the unit 5 Recheck voltage and amp draw with unit running If voltage is not within range listed on unit nameplate stop unit and consult power company Refer to unit nameplate for maximum rated load amps 6 Inspect and adjust blower belt see section on Blower Compartment Blower Belt Adjustment B Cooling Startup LGA LCA NOTE Crankcase heaters must be energized 24 hours be fore attempting to start compressor Set thermostat so that there is no demand to prevent compressor from cycling Ap ply power to unit 1 Initiate first and second stage cooling demands accord ing to instructions provided with thermostat 2 First stage thermostat demand will energize compres sor 1 Second stage thermostat demand will energize compressor 2 On units with an economizer when out door air is acceptable a first stage demand will ener gize the economizer a second stage demand will en ergize compressor 1 3 Units contain two refrigerant circuits or stages See fig ure 28 4 Each refrigerant circuit is separately charged with R 22 refrigerant See unit rating plate for correct amount of charge 5 Refer to Cooling Operation and Adjustment section for proper method to check refrigerant charge REFRIGERANT STAGES BOTH FANS ARE ENERGIZED WITH A Y1 DEMAND CONDENSER FAN 2 CONDENSER FAN 1 FIGURE 28 Three Phase Scroll Compressor Voltage Phasing Three
143. ower failure The manual shut off knob can be used to imme diately shut off gas supply CAUTION For safety connect a shut off valve between the manometer and the gas tap to permit shut off of gas pressure to the manometer Manifold Adjustment Procedure 1 Connect test gauge to the outlet pressure tap on the gas valve Start the unit call for second stage heat and allow five minutes for the unit to reach steady state 2 While waiting for the unit to stabilize notice the flame The flame should be stable without flashback and should not lift from the burner heads Natural gas should burn basically blue with some clear streaks L P gas should burn mostly blue with some clear yellow streaks 3 After allowing the unit to stabilize for five minutes re cord the manifold pressure and compare to the values given for gas supply pressure above A CAUTION Disconnect heating demand as soon as an accurate reading has been obtained 5 Proper Gas Flow To check for proper gas flow to burners determine Btuh input from unit rating plate or the gas heating capacity table on page 3 Divide this input rating by the Btuh per cubic foot of available gas Result is the number of cubic feet per hour re quired Determine the flow of gas through gas meter for two minutes and multiply by 30 to get hourly flow of gas to the burners NOTE To obtain accurate reading shut off all other gas appliances connected to meter 6 High
144. ppliance and call your service technician or gas supplier Turning Off Gas to Appliance 1 If using an electromechanical thermostat set to the lowest setting 2 Before performing any service turn off all electrical power to the appliance 3 Open or remove the heat section access panel 4 Turn the knob on the gas valve clockwise 499 to OFF Depress 36C knob slightly Do not force E Heating Startup LHA 1 Set thermostat or temperature control device to initiate a first stage heating demand A first stage heating demand W1 will energize com pressor Outdoor fan is energized with a W1 demand LHA Units With Optional Electric Heat An increased heating demand W2 will energize elec tric heat F Safety or Emergency Shutdown Turn off power to the unit Page 65 V SYSTEMS SERVICE CHECKS A LGA Heating System Service Checks All LGA units are A G A and C G A design certified with out modification Before checking piping check with gas company or au thorities having jurisdiction for local code requirements Refer to the LGA Installation Operation and Adjust ments instruction for more information GAS PIPING COMPONENTS REFER TO INSTALLATION INSTRUCTIONS FIELD PROVIDED GROUND 1 8 3 2 mm PRESSURE JOINT UNION CAP HERE TO ISOLATE VALVE PRESSURE TESTING MANUAL MAIN SHUT OFF VALVE REFER TO LOCAL CODES gt DRIP LEG GAS PIPING 44 SUPPORT FIGURE 30 1 G
145. put hp 2 3 5 2 3 5 2 3 5 wie wl 15 22 37 15 22 37 15 22 37 Full load amps 7 5 10 6 16 7 3 4 4 8 7 6 2 7 3 9 6 1 Locked rotor amps 46 9 66 105 20 4 26 8 45 6 16 2 23 4 36 6 1 Maximum Overcurrent With Exhaust Fan 70 80 80 35 35 40 30 30 30 Protection amps Less Exhaust Fan 70 80 80 35 35 40 30 30 30 2 Minimum Circuit With Exhaust Fan 60 64 70 30 31 34 24 25 28 Ampacity Less Exhaust Fan 58 61 67 28 30 32 23 24 27 Optional Power Number Horsepower W 1 1 3 249 1 1 3 249 1 1 3 249 Exhaust Full load amps 24 13 10 Locked rotor amps 47 24 1 9 Service Outlet 115 volt amp rating 15 15 15 NOTE Extremes of operating range are plus and minus 1096 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 25 BLOWER DATA 088 100 BLOWER TABLE INCLUDES RESISTANCE FOR 88 BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FOR ALL UNITS ADD 1 Wet indoor coil air resistance of selected unit 2 Any factory installed options air resistance heat section economizer etc 3 Any field installed accessories air resistance duct resistance diffuser etc Then determine from blower table blower motor output and drive required See pages 21 and 22 for accessories and motor drives MINIMUM AIR VOLUME REQUIRED FOR USE WITH OPTIONAL ELECTRIC HEAT LCA LHA models require 3000 cfm 1415 L
146. r filter access door at the end of the unit Filters should be checked monthly or more frequently in severe use and cleaned or replaced regularly Take note of the AIR FLOW DIRECTION marking on the filter frame when re installing NOTE Filters must be U L C certified or equivalent for use in Canada B Lubrication All blower motors used in LGA LCA LHA units are pre lubricated no further lubrication is required C Supply Air Blower Wheel Annually inspect supply air blower wheel for accumulated dirt or dust Turn off power before attempting to remove ac cess panel or to clean blower wheel CAUTION Be careful when servicing unit to avoid accidental contact with sharp metallic edges which may cause personal injury D Evaporator Coil Inspect and clean coil at beginning of each season Clean using mild detergent or commercial coil cleanser Check condensate drain pan and line if necessary Flush coil and condensate drain with water taking care not to get insula tion filters and return air ducts wet Check connecting lines and coil for evidence of oil and refrigerant leaks E Condenser Coil Clean condenser coil annually with detergent or commer cial coil cleaner and inspect monthly during the cooling season Check connecting lines and coil for evidence of oil and refrigerant leaks NOTE If owner complains of insufficient cooling the unit should be gauged and refrigerant charge checked Refer to Gauge Man
147. r white case no display COSNSR52AE1L 87 53 x Sensor black case w display COSNSR51AE1L 87 52 x Sensor black case display COSNSR53AE1L 87 54 Sensor Duct Mounting Kit COMISC19AE1 85L43 Aspiration Box for duct mounting Sensor COMISC16AE1 90 43 Handheld Monitor LTAIAQSHMO3 36 70393 x ECONOMIZER Economizer Economizer Order Hood Separately LAREMD10 15 53K51 9 9 9 e Outdoor Air Hood down flow Number of Filters LAOAH10 15 53 05 9 9 e 2 16 x 25 x 1 in 406 x 635 x 25 mm Economizer Controls Differential Enthalpy C1SNSRO7AE 86M33 e e e Single Enthalpy C1SNSROGAE 86 32 e 9 e e Global Enthalpy Sensor Field Provided Factory Differential Sensible Furnished Factory O e Relief Down Flow Barometric Relief Dampers Order Hood Separately LAGED10 15 53 03 9 9 9 e Hood for Down Flow LAGED 9 15 88 79 D X Horizontal Barometric Relief Dampers Hood Furnished LAGEDH03 15 53 04 D D x D OUTDOOR AIR Outdoor Air Dampers Damper Section down flow Motorized Order Hood Separately LAOADM10 15 53 53 9 9 e e Damper Section down flow Manual Order Hood Separately LAOAD10 15 66 69 9 9 9 e Outdoor Air Hood down flow Number of Filters LAOAH10 15 53 05 9 9 e e 2 16 x 25 x 1 in 406 x 635 x 25 mm Power Exhaust Standard Static 208 230V LAPEF10 15 73 32 e e e e 460V LAPEF10 15 7
148. r standard cooling refrigerant routing tion These units contain a reheat coil adjacent to and downstream of the evaporator coil Reheat coil solenoid valve L14 routes hot discharge gas from the compressor REHEAT MODE REFRIGERANT ROUTING RETURN OUTDOOR AIR smcE2 EVAPORATOR COIL TWO CONDENSER FANS STAGE 1 Y EVAPORATOR COL 7 N EXPANSION VALVE STAGE 2 COMPRESSOR FIGURE 37 COOLING MODE REFRIGERANT ROUTING 22 UAR OUTDOOR AIR STAGE 2 EVAPORATOR COIL TWO CONDENSER STAGE 1 EVAPORATOR COL 7 N EXPANSION gt ONE 7 id COMPRESSOR COMPRESSOR FIGURE 38 Page 74 A67 RH1 BOARD LOCATION ON M1 BOARD YELLOW LED INDICATES OUTPUT TO L14 REHEAT VALVE FLASHING GREEN HEARTBEAT LED INDICATES NORMAL OPERATION FIGURE 39 L14 Reheat Coil Solenoid Valve When IMC board input P114 10 indicates room conditions require dehumidification L14 reheat valve is energized RH1 board P175 3 and refrigerant is routed to the reheat coil RH1 Humiditrol Board The RH1 add on board is factory installed in all Humiditrol units RH1 is located on the M1 board as shown in figure 39 Reheat Setpoint Reheat is factory set to energize when indoor relative hu midity rises above 60 default Reheat will terminate when the indoor relative humidity falls 3 below setpoint or 57 default The reheat setpoint can be adjus
149. rols are used in the LGA units All three ignition controls op erate the same The ignition control provides three main functions gas valve control ignition and flame sensing The unit will usually ignite on the first attempt however the ignition at tempt sequence provides three trials for ignition before lock ing out The lockout time for the Johnson control is 5 minutes The lockout time for the Ram control and Fenwall control is 1 hour After lockout the ignition control automatically resets and provides three more attempts at ignition Manual reset after lockout requires breaking and remaking power to the ignition control See figure 18 for a normal ignition sequence and figure 19 for the ignition attempt sequence with re trials nominal timings given for simplicity Specific timings for the ignition controls are shown in figure 20 The RAM and JOHNSON control will have an LED to help troubleshoot and show control operation See table 3 for LED codes Flame rectification sensing is used on all LGA units Loss of flame during a heating cycle is indicated by an ab sence of flame signal 0 microamps If this happens the con trol will immediately restart the ignition sequence and then lock out if ignition is not gained after the third trial See Service System Checks section for flame current measurement The control shuts off gas flow immediately in the event of a power failure Upon restoration of gas and power the control will re
150. scharge 10 Suction 5 psig tering Air Temp psig KE Page 60 TABLE 19 TABLE 24 LGA LCA090H NORMAL OPERATING PRESSURES LHA102H NORMAL OPERATING PRESSURES Outdoor CIRCUIT 1 CIRCUIT 2 Outdoor CIRCUIT 1 CIRCUIT 2 Coil Coil 1 Entering Dis 10 Suct 5 Dis 10 Suc 5 Entering Dis 10 Suct 5 Dis 10 Suct 5 Air Temp psig psig psig Air Temp psig psig psig psig 78 65 F 156 77 154 77 80 75 F 185 78 185 78 81 85 F 215 80 216 79 ee 28 11593 303 83 309 83 TABLE 20 TABLE 25 090 with Humiditrol 1025 NORMAL OPERATING PRESSURES CIRCUIT 1 CIRCUIT 2 Outdoor CIRCUIT1 CIRCUT2 Coil Coil Discharge Suction Discharge Suction Entering Dis 10 Suct 5 Dis 10 Suc 5 Entering 10 5 10 psig psig psig Air Temp psig psig psig psig 78 165 78 80 190 75 F 26 7 20 xs asp 247 9 22 so 95 F 273 82 82 88 248 105 F 310 84 326 8 84 14522 340 86 aer 86 86 TABLE 26 LCA LGA102H NORMAL OPERATING PRESSURES TABLE 21 OSCH CIRCUT2 LHA090 NORMAL OPERATING PRESSURES Discharge Suction Discharge Suction ucc s d Air Tem si si si psi Discharge Suction Discharge Suction peg PS Enterin 10 5 10 5 AirTemp psio psig psig psig 7T5 E 185 73 79 85 F a
151. st 5 kw 25 30 22 5 kW 35 40 30 kW 45 45 45 kW 70 70 60 kw 70 70 2 Minimum Unit only 48 51 Le T rx p p p 19 22 Circuit with power 0 kW 20 23 A exhaust 15 kW 25 27 22 5 kW 34 36 30 kW 43 45 45 kW 61 63 60 kW 84 64 67 Unit Fuse Unit only 56K94 56K94 56K95 25K08 25K08 25K09 56K51 56K52 Block with power exhaust 56K94 56K94 56K95 25 08 25 08 25 09 56K52 56K52 Disconnect 0 15 kW 84M13 84M13 84M13 84M13 84 13 84 13 84M13 22 5 kW 84M13 84M13 84M14 84M13 84M13 84M13 84M13 30 45 kW 84M14 84M14 84M14 84M13 84M13 84M13 84M13 60 kw 84M14 84M14 84M13 Terminal 15 45 kw 30K75 30K75 Block 60 kw 30K76 30K75 NOTE Extremes of operating range are plus and minus 1096 of line voltage 1 HACR type breaker or fuse 2 Referto National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 22 ELECTRICAL DATA Model No ModlNo LCA LGA150 Unit Efficiency Standard S Standard S Standard S Compressors 2 Condenser Fan Motors 2 Evaporator Blower Motor Rec max fuse size amps Minimum Circuit Ampacity Optional Power Exhaust Fan _ doo each total 37 2 18 0 14 8 mw J d each total 812 140 108 m x89 388 _ s m
152. stalled in the return air opening When the outdoor air enthalpy is below the re turn air enthalpy the economizer opens to bring in out door air for free cooling 4 GLO MODE GLOBAL Global Mode The GLO or global mode is used with an energy management system which includes a global con trol feature Global control is used when multiple units in one location respond to a single outdoor air sensor Each energy management system uses a specific type of out door sensor which is installed and wired by the controls contractor Motorized Outdoor Air Damper The GLO mode is also used when a motorized outdoor air damper is installed in the system regardless of whether an energy management system is used NOTE All economizer modes of operation will mod ulate dampers to 55 F 13 C supply air F LAGED08 10 and 10 15 and LAGEDH10 15 Gravity Exhaust Dampers LAGED08 10 and 10 15 and LAGEDH10 15 dampers used with LGA LCA LHA series units LAGED dampers are used in downflow see figure 36 and LAGEDH are used in horizontal air discharge applications LAGEDH gravity exhaust dampers are installed in the return air duct The dampers must be used any time an economiz er and a power exhaustfan is applied to LGA LCA LHA series units Gravity exhaust dampers allow exhaust air to be discharged from the system when an economizer and or power exhaust is operating Gravity exhaust dampers also prevent outdoor air
153. start the ignition sequence and continue until flame is established or system locks out On a heating demand the ignition control is energized by the main control module A55 The ignition control then allows 30 seconds for the combustion air blower to vent exhaust gases from the burners When the combustion air blower is purging the exhaust gases the combustion air prove switch is closing proving that the combustion air blower is operating before al lowing the ignition control to energize When the combustion 777 CLOSED ___ OFF OPEN SECONDS 09 30 35 air prove switch closed and the delay is over the ignition control activates gas valve the spark electrode and the flame sensing electrode Sparking stops immediately after flame is sensed The combustion air blower continues to operate throughout the heating demand If the flame fails or if the burn ers do not ignite the ignition control will attempt to ignite the burners up to two more times If ignition cannot be obtained af ter the third attempt the control will lock out The ignition control is not adjustable The RAM control is illustrated in figure 17 The four quick connect terminals are used to wire the control to unit Each of the four quick terminals are identified by function The spark electrode wire connects to the spark plug type connector on top of the control TABLE 3 LED Code Steady ON Normal 2 Flash Reset Mode Steady Flash Fail
154. ta arrangement Elements in 460 and 575V units are connected in Wye arrangement Each stage is en ergized independently by the corresponding contactors located on the electric heat vestibule panel Once ener gized heat transfer is instantaneous High temperature protection is provided by primary and redundant high temperature limits and overcurrent protection is pro vided by fuses 7 Fuse F3 Fuse F3 are housed in a fuse block which holds three fuses Each F3 fuse is connected in series with each leg of electric heat Figure 25 and table 5 show the fuses used with each electric heat section For simplicity the ser vice manual labels the fuses F3 1 through F3 4 Page 49 TABLE 5 LCA LHA ELECTRIC HEAT SECTION FUSE RATING EHA QUANTITY amp SIZE 100 7 5 100 15 100 22 5 100 30 100 45 102 7 5 EHA150 15 EHA360 22 5 EHA150 30 EHA150 45 EHA150 60 VOLTAGES CRT Dems Dese mem Ce Tess EE Ce Dose Iess sar Tess Gem Ce Iess EE ease RRE IC REH Iess Dese mem Ce Iess EE me Tess Iess Iess 208 230 60 Amp 250V 60 Amp 250V 460V 50 Amp 600V 575V 40 Amp 600V Page 50 FUSE 3 each 2 See Drees Drees
155. ted by changing ECTO 4 25 A setting of 100 will disable reheat A91 Humidity Sensor Install humidity sensor in the conditioned space according to instructions provided with sensor Relative humidity should correspond to the sensor A91 output voltage listed in table 43 For example if indoor air relative humidity is 80 3 the humidity sensor output should read 8 00VDC Check the sensor output annually for accuracy Keep the air intake openings on the sensor clean and free of obstruc tions and debris Read Relative Humidity At IMC Turn MODE DIP TEMP switch 4 ON Display will alter nately flash from readout to output A single push on the pushbutton will toggle the readout upward from 0 to 7 in crementally A double push will toggle the readout down ward from 7 to 0 incrementally Readout 7 indicates per cent relative humidity Check Out Test Humiditrol operation using the following procedure 1 Make sure RH sensor is wired as shown in figure 40 or 41 2 Set IMC ECTO system mode parameter 6 01 to option 0 default local thermostat mode 3 Set IMC ECTO reheat setpoint parameter 4 25 to 096 relative humidity 4 Jumper the following TB1 terminals 8 amp 9 occupied mode 6 amp 3 blower demand G 6 amp 18 Y1 cooling demand The blower compressor 1 reheat and compressor 2 cool ing should be operating 114 LED on the A67 board should also be ON indicating the reheat valve is energized 5 Disc
156. thermostat installation instructions for more detail NOTE Lennox LHA heat pumps use standard heat cool type thermostats Attempted use of heat pump type thermostat on LHA unit will result in improper op eration 1 Electro mechanical thermostat 13206 The electro mechanical thermostat is a two stage heat two stage cool thermostat with dual temperature levers A non switching or manual system switch subbase may be used 2 Electronic thermostat see price book Any two stage heat two stage cool electronic ther mostat may be used 3 Honeywell T7300 thermostat 81G59 The Honeywell T7300 thermostat is a programmable in ternal or optional remote temperature sensing thermo stat The T7300 provides occupied and unoccupied changeover control J Smoke Detectors A17 and A64 Photoelectric smoke detectors are a factory installed option The smoke detectors can be installed in the supply air sec tion A64 return air section A17 or in both the supply and return air section Wiring for the smoke detector is shown on the ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT diagram in the back of this manual K Blower Proving Switch 552 The blower proving switch monitors blower operation and locks out the unit in case of blower failure The switch is N O and closes at 14 W C 34 9 Pa The switch is mounted on the upper left hand corner of the blower deck Wiring for the blower prove switch is shown on the ELEC TRONIC OR ELECTROMECHANICAL T
157. to keep within the service factor limitations outlined on the motor nameplate NOTE ARI capacity is net and includes indoor blower motor heat deduction Gross capacity does not include indoor blower motor heat deduction Page 6 General Nominal Tonnage Data Model No Efficiency Type SPECIFICATIONS LHA 7 5 Ton 8 5 Ton LHA090H2B LHA102H2B High H High H 10 Ton LHA120H2B High H Cooling Performance Gross Cooling Capacity Btuh kW 1 Net Cooling Capacity Btuh kW ARI Rated Air Flow cfm L s 94 000 27 5 89 000 26 1 3000 1415 104 000 30 5 100 000 29 3 3500 1650 124 000 36 3 118 000 34 6 4200 1980 Total Unit Power kW 7 7 9 1 11 5 1 EER Btuh Watt 11 5 11 0 10 3 2 Integrated Part Load Value Btuh Watt 12 0 12 4 11 3 Refrigerant Charge Circuit 1 12 Ibs 0 oz 5 4 kg 11 Ibs 0 oz 5 0 kg 12 Ibs 8 oz 5 7 kg Furnished R 22 Circuit 2 12 Ibs 0 oz 5 4 kg 11 Ibs 0 oz 5 0 kg 12 Ibs 8 oz 5 7 kg 3Sound Rating Number dB 88 88 88 Heating 1 Total High Heating Capacity Btuh KW 90 000 26 4 102 000 29 9 120 000 35 1 Performance Total Unit Power kW 8 0 8 8 10 7 1 C O P 3 3 3 4 3 3 1 Total Low Heating Capacity Btuh KW 52 000 15 2 56 000 16 4 72 000 21 1 Total Unit Power kW 7 3 1 5 10 1 1 C O P 2 2 2 2 2 2 2 Sorel 2 Scrol Outdoor Net face area sq ft m 28 6 2 66 total 29 3 2 72 total 28 6 2 66 total Coil T
158. trip TB34 energizes the economizer components with 24VAC OPERATION The main control module A55 along with outdoor enthalpy sensor A7 and indoor enthalpy sensor A62 if differential enthalpy is used communicates to the economizer control module A56 when to power the damper motor B7 The economizer control module A56 supplies B7 with O 10 VDC to control the positioning of economizer The damper actuator provides 2 to 10 VDC position feedback Page 88 7 5 15 22 5 30kW Y VOLTAGE COMPONENT FUSE ELECTRIC HEAT ELEMENT ELECT HEAT HEAT 2 JACK ELECTRIC HEAT n JACK ELECT HT SUB BASE KIT JACK BLOWER amp COOL CONT K ELECIRIC HEAT HARNESS COMB ON AIR B 15 110 RELAT FOND ELECTRIC HT IKI6 HT 2 2 PLUG ELECTRIC HEAT 7 PLUG ELECT HT SUB BASE KIT PIII PLUG GAS OUTPUT EIS PLUG BLOWER 4 COOL CONT ER IPLUG ELECTRIC HEAT HARNESS PLUG FAN LIMIT ELECT HEAT Sis ISWITCH LIMIT PRIMARY ELECT HT 520 563 SWITCH LIMIT ELECT aT 2 RMINA R TERMINAL STRIP ELECTRIC HEAT TERMINAL STRIP POWER DISTRIB 7834 TERMINAL STRIP TRANS TB35 TERMINAL STRIP TRANS A UNITS 036 TO 072 UNITS 088 amp 100 090 10 150 S20 LIMIT QN A BOX 15 NOT RESETABLE amp REMOVE JUMPER PLUG WHEN FIELD WIRING DIAGRAM INSTALLING ELECTRIC HEAT Ay J2 P2 J144 P144 AND S63 ARE NOT HE
159. ube diameter in mm 3 8 9 5 3 8 9 5 3 8 9 5 Number of rows 2 2 2 Fins per inch m 20 787 20 787 20 787 Outdoor Motor horsepower W 2 1 3 249 2 1 3 249 2 1 3 249 Fans Motor rpm 1075 1075 1075 Total Motor watts 700 700 700 Diameter in mm 2 24 610 2 24 610 2 24 610 Number of blades 3 3 3 Total Air volume cfm L s Net face area sq ft m Tube diameter in mm Number of rows Fins per inch m Condensate Drain number and size Expansion device type Indoor Coil 8000 3775 10 5 0 98 total 8000 3775 10 5 0 98 total 3 8 9 5 3 8 9 5 3 4 14 551 14 551 1 1 in NPT coupling 1 1 in NPT coupling 8000 3775 10 5 0 98 total 3 8 9 5 4 14 551 1 1 in NPT coupling Balanced Port Thermostatic Expansion Valve removeable power head Indoor Blower and Drive Maximum usable motor output Selection US Only Nominal motor output Motor Drive kit Wheel nominal diameter x width Filters Type of filter Number and size in mm Electrical characteristics service factor limitations outlined on the motor nameplate 2 hp 1 5 kW 3 hp 2 2 kW 5 oe 3 7 kW hp 1 7 kW 25 hp 2 6 kW EEN 2 hp kit 1 680 925 rpm kit 3 895 1120 rpm 3 hp kit 1 680 925 rpm kit 2 680 925 rpm kit 895 1120 rpm kit 4 895 1120 rpm kit 5 1110 1395 rpm kit 6 1110 1395 rpm 5 hp kit 4
160. ufacturer 3 High Pressure Switches S4 and S7 The high pressure switch is an auto reset SPST N C switch which opens on a pressure rise All LGA LCA LHA units are equipped with this switch Each switch is located in the com pressor discharge line S4 first circuit and S7 second circuit are wired in series with the respective compressor contactor coils Units charged with R 22 When discharge pressure rises to 450 10 psig 3103 69 kPa indicating a problem in the system the switch opens and the respective compressor is de energized the economizer can continue to operate When dis charge pressure drops to 300 20 psig 2068 138 kPa the pressure switch will close Units charged with R 410A When discharge pressure rises to 640 10 psig 4413 69 kPa indicating a problem in the system the switch opens and the respective compressor is de energized the economizer can continue to operate When dis charge pressure drops to 475 20 psig 3275 138 kPa the pressure switch will close Main control A55 has a three strike counter before lock ing out This means the control will allow three high pres sure trips per one thermostat demand The control can be reset by breaking and remaking the thermostat demand or manually resetting the control 4 Low Ambient Switches S11 amp S84 The low ambient switch is an auto reset SPST N O pres sure switch which allows for mechanical cooling opera tion at low outdoor temper
161. ure Steady ON Normal 5 sec Reset Mode No Power or Detected RAM IGNITION CONTROL GAS VALVE 24VAC OUTPUT OWER SEDES D 24VAC INPUT SIT 1234 SPARK Johnson TOP VIEW FIGURE 17 NORMAL IGNITION SEQUENCE TIMINGS NOMINAL 70 EN ENDOF DEMAND GAS VALVE IGNITION waive I mn A 3 BLOWER IGNITION TRIAL FIGURE 18 Page 45 THERMOSTAT DEMAND SECONDS 0 5 30 T RETRIALS SEQUENCE TIMINGS NOMINAL Ge COMBUSTION AIR BLOWER COMBUSTION AIR PROVE SWITCH 77 GAS VALVE 4 H IGNITION SPARK BLOWER WATCHGUARD IGNITION TRIAL LOCKOUT FIGURE 19 IGNITION CONTROL TIMING ON 6 3 4 2 0 SEC THERMOSTAT THERMOSTAT DEMAND END OF SECONDSO 30 30 30 DEMAND mE S CYCLE COMBUSTION AIR BLOWER GAS VALVE IGNITION SPARK BLOWER IGNITION TRIAL l 42 SEC 122 SEC FIGURE 20 A WARNING SHOCK HAZARD SPARK RELATED COMPONENTS CONTAIN HIGH VOLTAGE WHICH CAN CAUSE OR DEATH DISCONNECT PERSONAL INJURY POWER BEFORE SERVICING CONTROL IS NOT FIELD REPAIRABLE UNSAFE OPERATION WILL RESULT IF THE CONTROL IS INOPERABLE SIM PLY REPLACE THE ENTIRE CONTROL 2 Heat Exchanger Two styles used Figures 15 and 16
162. ust be used and recovered responsibly Failure to follow this warning may result in personal injury or death The LHAO88 packaged heat pump units are available in 86 000 Btuh 25 3 kW heating inputs and 7 5 ton cooling capacities The LHA088 utilizes one compressor one re versing valve one accumulator and other parts common to a heat pump The LHAO90 102 120 and 150 packaged heat pump units are available in 90 000 102 000 120 000 and 136 000 Btuh 26 4 29 9 35 1 and 39 8 kW with 7 5 8 5 10 and 12 5 ton cooling capacities LHA090 150 refrig erant systems utilizes two compressors two reversing valves two accumulators and other parts common to a heat pump Optional auxiliary electric heat is factory or field installed in LHA units Electric heat operates in single or multiple stages depending on the kW input size 7 5kW through 45kW heat sections are available for the LHA088 090 100 and 102 and 15kW through 60kW for LHA120 and 150 Technical Publications Page 1 Veo LGA120 10 TON SHOWN If the unit must be lifted for service rig unit by attaching four cables to the holes located in the unit base rail two holes at each corner Refer to the installation instructions for the proper rigging technique Information contained in this manual is intended for use by qualified service technicians only All specifications are sub ject to change Procedures outlined in this manual are pre sented as a recommendation onl
163. ve the burner air intake opening in the burner enclosure see figure 16 S47 is wired to the main control pan el A55 When S47 senses flame rollout indicating a blockage in the combustion air passages the flame rol lout limit trips and the ignition control immediately closes the gas valve Limit S47 is factory preset to open at 250 F 12 F 121 1 C 6 7 C for standard heat units and 270 F 12 F 132 C 6 7 C for high heat units on a temperature rise All flame rollout limits are manual reset 6 Combustion Air Prove Switch S18 The combustion air prove switch 518 is a SPST N O pressure Switch located in the vestibule area 518 monitors combustion air inducer operation Switch 518 is wired to the ignition control A3 The switch closes at negative 0 46 W C 0 05 114 12 4 on pressure fall This negative pressure fall and switch actuation allows the ignition sequence to contin ue proves by closing that the combustion air inducer is operating before allowing the gas valve to open The com bustion air prove switch is factory set and not adjustable The switch will automatically open on a pressure rise less negative pressure at 0 31 W C 0 05 W C 77 2 12 4 Pa The combustion air prove switch is factory set and not adjustable 7 Combustion Air Inducer Combustion air inducer B6 provides fresh air to the burners while clearing the combustion chamber of exhaust gases The inducerbegins op
164. w g Pa 80 200 11 00 250 1 20 300 1 40 350 1 60 400 1 80 450 2 00 495 2 20 545 2 40 595 2 60 645 2250 1060 2500 1180 2750 1300 3000 1415 3250 1535 3500 1650 3750 1770 4000 1890 4250 2005 4500 2125 4750 2240 5000 2360 5250 2475 5500 2595 5750 2715 6000 2830 RPMBHP KW 455 0 30 0 22 475 0 40 0 30 495 0 45 0 34 525 0 55 0 41 a e e a 0 48 580 0 80 0 60 605 0 95 0 71 635 1 10 0 82 665 1 30 0 97 695 1 50 1 12 40 100 RPM BHP k 555 0 45 0 34 575 0 55 0 41 595 0 65 0 48 615 0 75 0 56 640 0 90 0 67 665 1 05 0 78 690 1 20 0 90 715 1 40 1 04 740 1 60 1 19 770 1 80 1 34 60 150 RPM BHP kW 640 0 60 0 45 660 0 70 0 52 675 0 85 0 63 695 0 95 0 71 715 1 10 0 82 740 1 25 0 93 760 1 45 1 08 785 1 65 1 23 810 1 85 1 38 835 2 10 1 57 725 1 751795 2 051860 2 40 1 31 760 2 05 1 53 1 53 825 235 1 75 1 79 885 2 65 1 98 790 2 30 855 2 651910 2 95 1 72 1 98 2 20 820 2 60 880 2 95 940 3 30 1 94 850 2 95 2 20 2 20 910 3 30 2 46 2 46 965 370 2 76 RPM RPM BHP kW kW 720 080 790 1 00 0 60 0 75 735 0 90 805 1 10 0 67 0 82 770 120 835
165. y and do not supersede or replace local or state codes AWARNING Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must be performed by a qualified installer or service TABLE CONTENTS Specifications Page 2 Field Installed Accessories Page 9 Electric Heat Capacities Page 15 Electric Heat Electrical Data Page 16 Blower Data Page 26 Unit Components Page 33 Electric Heat Page 49 Placement and Installation Page 60 Ill Charging Page 60 IV Start Up Page 64 V Systems Service Checks Page 66 Maintenance Page 69 Accessories Page 70 VIII Diagrams and Operating Sequence Page 78 1999 Lennox Industries Inc SPECIFICATIONS LCA LGA Model No LCA LGA088 LCA LGA100 Efficiency type Standard Standard Gross Cooling Capacity Btuh KW 94 000 27 5 90 000 26 4 100 000 29 3 Cooling 1 Cooling Capacity Btuh KW 88 000 25 8 85 000 24 9 94 000 27 5 Ratings Total Unit Power KW 97 014 ____ TEER Bun Wat 99 99 TSound Rating Number db Oe 8 lbs 0 oz 8 Ibs 8

LGA/LCA/LHA WARNING

Contents

Download Pdf Manuals

Related Search

Related Contents