13ACX Product Detail Sheet
Contents
1. LENNOX UNIT INFORMATION 13ACX Corp 0612 L2 z p TM Revised 07 2006 Service Literature 13ACX SERIES UNITS The 13ACX is a high efficiency residential split system con densing unit which features a scroll compressor and de signed for R 410A refrigerant 13ACX units are available in sizes ranging from 1 1 2 through 5 tons The series is de signed for use with an expansion valve in the indoor unit This manual is divided into sections which discuss the major components refrigerant system charging procedure main tenance and operation sequence Information contained in this manual is intended for use by qualified service technicians only All specifications are sub ject to change A IMPORTANT Operating pressures of this R 410A unit are higher than pressures in R 22 units Always use service equipment rated for R 410A AWARNING Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must TABLE OF CONTENTS be performed by a qualified installer or service General abus reser seer pas E EE Page 1 agency Specifications Electrical Data Page 2 A WARNING Application sssses essen Page 3 Warranty will be voided if covered equipment is re PUNE COMPANIONS cnn aCe e RUE Pagea moved from original installation site Warranty will Ill Refrigeration System Page 6 not cover damage or defec2. If the push pin is loose and tends not to stay in place brush the fins with a fin brush 22 fins in Line up the push pin a couple fins to the right or left of the original hole and re insert the pin 2 Outdoor fan motor is prelubricated and sealed No further lubrication is needed 3 Visually inspect connecting lines and coils for evidence of oil leaks 4 Check wiring for loose connections Page 11 5 Check for correct voltage at unit unit operating 6 Check amp draw outdoor fan motor Unit nameplate Actual NOTE If owner reports insufficient cooling the unit should be gauged and refrigerant charge checked See refrigerant charging section 9 pins used on 048 and 060 6 pins all others QUU XXXXXXXXXX AXAXXXXXXXXXXAXX X KAY KAN RAN RAN RAX RAND D pus o AA ayy MESH SCREEN AA AU NS KXXXXXXXX Figure 12 D Indoor Coil 1 Clean coil if necessary 2 Check connecting lines and coils for signs of oil leaks 3 Check the condensate pan line and clean if necessary Indoor Unit 1 Clean or change filters 2 Adjust blower speed for cooling The pressure drop over the coil should be measured to determine the correct blower CFM Refer to the unit information service manual for pressure drop tables and procedure 3 Check all wiring for loose connections 4 Check for correct voltage at unit blower operating 5 Check amp draw on blower motor Unit nameplate Actual VI WIRING DIA
3. 8 35 82 1 702 75 Page 10 V MAINTENANCE A WARNING Electric shock hazard Can cause injury or death Before attempting to perform any service or maintenance turn the ily electrical power to unit OFF at discon nect switch es Unit may have multiple power supplies Maintenance and service must be performed by a qualified installer or service agency At the beginning of each cooling season the system should be checked as follows 1 Make sure power is off before cleaning Clean and inspect outdoor coil The coil may be flushed with a water hose The outdoor coil is protected by an inner mesh screen and a wire cage see figure 12 If debris has collected between the mesh screen and the coil and cannot be dislodged by spraying unpressurized water from inside coil surface to the outside the mesh may be removed by first removing the top of the unit which will allow for re moval of the wire cage Then using pliers to grip the head of the push pins pull straight out to extract the push pins along one side of the coil If necessary remove the push pins along the back of the unit it is usually unnecessary to fully remove the inner mesh screen Drape the mesh screen back and wash the coil When all the debris has been removed from the coil reinstall the mesh screen by positioning it in its original position and reinserting the push pin No tool is required to push the pin back into the same slot in the fins
4. Danger of explosion Can cause equipment damage injury or death When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air con ditioning system use a regulator that can adjust the pressure from 0 to 450 psig 3103 kPa Using an Electronic Leak Detector 1 Connect a cylinder of R 410A to the center port of the manifold gauge set Connect manifold gauge to service valve port 2 With both manifold valves closed open the valve on the R 410A cylinder 3 Open the high pressure side of the manifold to allow the R 410A into the line set and indoor unit Weigh in a trace amount of R 410A A trace amount is a maximum of 2 ounces 57 g or 3 pounds 31 kPa pressure Close the valve on the R 410A cylinder and the valve on the high pressure side of the manifold gauge set Disconnect the R 410A cylinder 4 Connect a cylinder of nitrogen with a pressure regulat ing valve to the center port of the manifold gauge set Page 7 5 Connect the manifold gauge set high pressure hose to the vapor valve service port Normally the high pres sure hose is connected to the liquid line port however connecting it to the vapor port better protects the man ifold gauge set from high pressure damage 6 Adjust the nitrogen pressure to 150 psig 1034 kPa Open the valve on the high side of the manifold gauge set which will pressurize line set and indoor unit 7 After a few minutes open a refrigeran
5. Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor 65 18 244 135 249 137 2411134 253 134 250 135 240 130 247 1 129 70 21 2621 136 268 138 259 135 2741135 268 137 257 131 265 130 75 24 281 137 288 138 2791 136 293 136 288 138 2781132 286 131 80 27 302 138 309 140 300 137 3151 137 310 139 299 133 310 132 322 138 345 140 369 141 393 142 418 143 445 144 474 145 105 41 417 145 430 145 1110 43 445 146 457 146 115 45 476 148 485 147 Temperature of the air entering the outside coil 338 139 361 139 385 141 410 142 436 143 463 145 491 146 Page 9 332 140 356 140 381 141 406 143 432 143 459 145 490 145 323 134 344 135 369 136 394 137 418 139 446 140 4771141 330 132 353 133 375 134 400 136 426 137 451 139 482 141 Charge Using the Subcooling Method Outdoor TABLE 5 Temperature 65 F 18 C R 410A Temperature F Pressure Psi When the outdoor ambient temperature is below 65 F P CF Psig 18 C use the subcooling method to charge the unit If nec essary restrict the air flow through the outdoor coil to achieve pressures in the 325 375 psig 2240 2585 kPa range These higher pressures are necessary for checking the charge Block equal sections of air intake panels and move obstructions sideways until the liquid pressure is in the
6. and the TOC if used begins its off cycle timing 6 Compressor contactor K1 is de energized 7 K1 1 opens and compressor B1 and outdoor fan motor B4 are de energized and stop immediately Page 12
7. scroll compres sor do not affect system reliability performance or indicate damage NOTE During operation the head of a scroll compressor may be hot since it is in constant contact with discharge gas SCROLL FORM FIGURE 4 CROSS SECTION OF SCROLLS DISCHARGE STATIONARY SCROLL DISCHARGE PRESSURE ILA SSSASASSANM SASAASSAASA SSS 2 y VEZZZZZZPFZZ p SAAAASASASY CLZLL LLL LLL LLL LL ILL MAAAAAAAAASSN VEPFZZZPZZ gA VL A NS N NA N NY NS TIPS SEALED BY ORBITING SCROLL DISCHARGE PRESSURE FIGURE 5 7 Page 4 SUCTION x ORBITING SCROLL STATIONARY SCROLL SUCTION POCKET SUCTION SUCTION 3 INTERMEDIATE PRESSURE 2 a GAS CRESCENT SHAPED GAS POCKET FLANKS SEALED 7 BY CENTRIFUGAL D FORCE J MOVEMENT OF ORBIT HIGH PRESSURE GAS SUCTION ay DISCHARGE POCKET FIGURE 6 C Condenser Fan Motor All units use single phase PSC fan motors which require a run capacitor In all units the condenser fan is controlled by the compressor contactor ELECTRICAL DATA tables in this manual show specifi cations for condenser fans used in 13ACX s Access to the condenser fan motor on all units is gained by removing the four screws securing the fan assembly See figure 7 The grill fan assembly can be removed from the cabinet as one piece See figure8 The condenser fan motor is removed from the fan guard by removing the four nuts found on top of the grill See figu
8. 30 L15 65 40 L15 65 50 Field Fabricate Time Delay Relay Kit 58M81 Unit Stand Off Kit 94J45 NOTE Extremes of operating range are plus 10 and minus 5 of line voltage 1 2 HACR type circuit breaker or fuse Refrigerant charge sufficient for 15 ft 4 6 m length of refrigerant lines 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 2 APPLICATION 13ACX condensing units are available in 1 1 2 2 2 1 2 3 3 1 2 4 and 5 ton capacities All major components indoor blower and coil must be matched according to Lennox rec ommendations for the compressor to be covered under war ranty Refer to the Engineering Handbook for approved sys tem matchups Il UNIT COMPONENTS Unit components are illustrated in figure 1 13ACX PARTS ARRANGEMENT OUTDOOR FAN CAPACITOR OFF CONTROL OPTION FIGURE 1 A Control Box Figure 2 13ACX units are not equipped with a 24V transformer All 24 VAC controls are powered by the indoor unit Refer to wiring diagram Electrical openings are provided under the control box cov er Field thermostat wiring is made to color coded pigtail connections ELECTROSTATIC DISCHARGE ESD Precautions and Procedures A CAUTION Electrostatic discharge can affect electronic com ponents Take precautions during unit installation and service to protect the unit s
9. 325 375 psig 2240 2585 kPa range See figure 11 P Blocking Outdoor Coil lt a mmm BLOCK OUTDOOR COIL ONE SIDE AT A TIME WITH CARDBOARD OR PLASTIC SHEET UNTIL PROPER TESTING PRESSURES ARE REACHED CARDBOARD OR PLASTIC SHEET o4 290 8 125 4459 95 295 1 451 8 99 4 57 6 03 8 63 5 190 9 308 2 69 5 194 1 75 6 197 3 81 6 200 6 87 8 203 9 94 0 002 1092 1158 134 6 1422 163 9 166 7 o o 9 A N a a ao w j N 0 o jin oo 3 w w A A NSIN SERRE 10 eo 321 8 326 4 31 0 35 7 40 5 1 45 3 12 EEA 220 9 107 50 1 2244 55 0 28 0 60 0 1 1 A ENS ojo N pE eT w C2 CoL N A N 3 1 06 5 N AR EN e ojo oj Or BR zal ak w e A oa e A A2 wj Oo ny amp o wo co 258 32 4 39 0 45 6 52 3 59 1 65 9 72 8 79 8 86 8 93 8 01 0 08 1 a A AJ OO o Qo Oi Ca C1 Ca Ga a ajo Qo N w co N NX co LL N AX XM oo o N gt e e ala 2 o O O w w N FIGURE 11 1 With the manifold gauge hose still on the liquid service port and the unit operating stably use a digital thermometer to check the liquid line temperature and record in table 6 2 At the same time record the liquid line pressure readin
10. GRAMS AND SEQUENCE OF OPERATION 13ACX A4 PURPLE TIMED OFF E79 BLACK ma CONTROL bres PONER ORANGE 20 VA MINIMUN RED NEC CLASS 2 YELLOW p CRANKCASE HEATER HIGH 208 230 60 1 PRESSURE S87 OR S24 SWITCH OR Z FOR USE WITH COPPER en DOE Dune KEY COMPONENT 1 1 8 TO UNIT RATING PLATE 20 VA MINIMUN A CONTROL TIMED OFF FOR MINIMUM CIRCUIT NEC CLASS 2 COMPRESSOR AMPACITY AND MAXIMUM OVERCURRENT PROTECTION ZA JUMPER IS USED WHEN TOC IS NOT USED 24 SWITCH LOSS OF CHARGE 540 THERMOSTAT CRANKCASE ON WARNING ELECTRIC SHOCK HAZARD CAN CAUSE 7 GROUNDED IN ACCORDANCE WITH MESE E MAE NATIONAL AND LOCAL CODES COMPONE LINE VOLTAGE FIELD INSTALLED wm CLASS VOLTAGE FIELD INSTALLED upersedes Form No New Form No 534 773W i H LOW PR 2005 Litho U S A NOTE The thermostat used may be electromechanical or electronic NOTE Transformer in indoor unit supplies power 24 VAC to the thermostat and outdoor unit controls COOLING 1 Cooling demand initiates at Y1 in the thermostat 2 24VAC from indoor unit Y1 energizes the TOC timed off control if used which energizes contactor K1 3 K1 1 N O closes energizing compressor B1 and outdoor fan motor B4 4 Compressor B1 and outdoor fan motor B4 begin immediate operation END OF COOLING DEMAND 5 Cooling demand is satisfied Terminal Y1 is de energized
11. Motor hp W 1 5 149 1 5 149 1 5 149 1 5 149 1 3 249 1 4 186 1 4 186 Cfm L s 2500 1180 2500 1180 2450 1155 2450 1155 2930 1385 3830 1805 3830 1805 Rpm 1100 1100 1100 1100 1100 825 825 Watts 200 200 200 200 310 330 330 Shipping Data Ibs kg 1 package 122 55 129 59 150 68 150 68 177 80 233 106 236 107 ELECTRICAL DATA Line voltage data 60 hz 1ph 208 230V 208 230V 208 230V 208 230V 208 230V 208 230V 208 230V 2 Maximum overcurrent protection amps 20 30 30 35 40 50 60 3 Minimum circuit ampacity 12 3 17 9 18 7 21 9 24 1 28 9 34 5 Compressor Rated load amps 9 0 26 2 Power factor 96 98 Locked rotor amps 48 134 Condenser Full load amps 1 0 1 7 Fan Motor Locked rotor amps 1 9 3 1 OPTIONAL ACCESSORIES must be ordered extra Compressor Crankcase 93M05 e Heater 31J20 e Factory Compressor Hard Start Kit 10J42 88M91 e e e e Compressor Low Ambient Cut Off 45F08 Compressor Sound Cover 69J03 Compressor Time Off Control 47J27 Freezestat 3 8 in tubing 93G35 1 2 in tubing 39H29 5 8 in tubing 50A93 Hail Guards 92M88 92M89 e 45M56 e 92M94 Loss of Charge Kit 84M23 Low Ambient Kit 34M72 Mounting Base 69J06 e 69J07 Refrigerant L15 41 20 L15 41 30 Line Sets L15 41 40 L15 41 50 L15 65
12. ance checks Table 4 is not a procedure for charging the system Minor varia tions in these pressures may be due to differences in installations Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system TABLE 3 13ACX Approach Values Liquid Line Temperature F C Outdoor Temperature F C F C Approach Temperature F C Model 018 024 030 036 042 048 060 65 18 8 2 10 9 8 6 16 1 9 3 6 2 10 1 70 21 8 5 11 0 8 6 15 6 10 3 5 2 9 8 75 24 8 3 10 8 8 6 15 8 10 8 6 1 10 0 80 27 8 3 10 8 8 7 15 7 11 0 6 2 9 9 85 29 8 1 10 6 8 8 15 8 10 6 6 2 9 2 90 32 8 4 10 5 8 8 15 5 10 2 6 0 9 3 95 35 8 2 10 0 8 6 15 3 10 0 5 8 9 0 100 38 7 8 9 2 8 6 15 0 9 8 5 8 8 8 105 41 7 6 9 1 8 4 14 8 9 7 5 4 8 6 110 43 7 2 8 7 8 3 14 5 9 0 4 9 8 6 115 45 7 3 8 2 8 6 14 4 8 4 47 8 8 NOTE For best results use the same electronic thermometer to check both outdoor ambient and liquid line temperatures F 1 0 C 0 5 TABLE 4 13ACX Normal Operating Pressures 030 Values below are typical pressures indoor unit match up indoor air quality equipment and 036 042 048 060 indoor load will cause the pressures to vary E Liquid Line Pressure Vapor Line Pressure Temp F C Liquid
13. apacitor for ratings 3 Timed Off Control TOC option The time delay is electrically connected between thermostat terminal Y and the compressor contactor Between cycles the compressor contactor is delayed for 5 minutes 2 min utes but may last as long as 8 minutes At the end of the delay the compressor is allowed to energize When thermo stat demand is satisfied the time delay opens the circuit to the compressor contactor coil and the compressor is de en ergized B Compressor The scroll compressor design is simple efficient and requires few moving parts A cutaway diagram of the scroll compressor is shown in figure 3 The scrolls are located in the top of the compressor can and the motor is located just below The oil lev el is immediately below the motor SCROLL COMPRESSOR DISCHARGE SUCTION FIGURE 3 The scroll is a simple compression concept centered around the unique spiral shape of the scroll and its inherent properties Figure 4 shows the basic scroll form Two identical scrolls are mated together forming concentric spiral shapes figure 5 One scroll remains stationary while the other is allowed to orbit fig ure 6 Note that the orbiting scroll does not rotate or turn but merely orbits the stationary scroll The counterclockwise orbiting scroll draws gas into the outer crescent shaped gas pocket created by the two scrolls figure 6 1 The centrifugal action of the orbiting scroll seals off the f
14. desirable to close the manifold gauge valve at least once to deter mine if there is a rapid rise in absolute pressure A rap id rise in pressure indicates a relatively large leak If this occurs repeat the leak testing procedure NOTE The term absolute pressure means the total actual pressure within a given volume or system above the absolute zero of pressure Absolute pressure in a vacuum is equal to atmospheric pressure minus vacu um pressure 6 When the absolute pressure reaches 23 000 microns 29 01 inches of mercury close the manifold gauge valves turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump Attach the manifold center port hose to a nitrogen cylin der with pressure regulator set to 150 psig 1034 kPa and purge the air from the hose with nitrogen Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves A CAUTION Danger of Equipment Damage Avoid deep vacuum operation Do not use compres sors to evacuate a system Extremely low vacuums can cause internal arcing and compressor failure Damage caused by deep vacuum operation will void warranty 7 Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the nitrogen from the line set and in door unit 8 Reconnect the manifold gauge to the vacuum pump turn the pump on and continue t
15. electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the unit the con trol and the technician at the same electrostatic po tential Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface be fore performing any service procedure Page 3 CONTROL BOX J77 4 DUAL CAPACITOR C12 COMPRESSOR CONTACTOR K1 TIMED OFF GROUNDING CONTROL LUG OPTION FIGURE 2 1 Compressor Contactor K1 A DANGER Shock Hazard Remove all power at disconnect before removing access panel Single phase 13ACX units use single pole contactors Potential exists for electrical shock resulting in injury or death Line voltage exists at all compo nents even when unit is not in op eration The compressor is energized by a single pole contactor lo cated in the control box See figure 2 K1 is energized by the indoor thermostat terminal Y1 24V when thermostat de mand is present 2 Dual Capacitor C12 The compressor and fan in 13ACX series units use per manent split capacitor motors The capacitor is located inside the unit control box see figure 2 A single dual capacitor C12 is used for both the fan motor and the compressor see unit wiring diagram The fan side and the compressor side ofthe capacitor have different MFD ratings See side of c
16. es 10 mm 29 mm Fabricated The liquid line and vapor line service valves figures 9 and 10 and gauge ports are accessible from the outside of the unit Use the service ports for leak testing evacuating charging and checking charge Each valve is equipped with a service port which has a facto ry installed Schrader valve A service port cap protects the Schrader valve from contamination and serves as the pri mary leak seal Service valves are not rebuildable If a valve has failed you must replace it To Access Schrader Port 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is complete replace service port cap Tight en finger tight then an additional 1 6 turn To Open Service Valve 1 Remove the stem cap with an adjustable wrench 2 Using the adjustable wrench to keep the valve station ary use a service wrench with a hex head extension to back the stem out counterclockwise as far as it will go NOTE Use a 3 16 hex head extension for 3 8 line sizes or a 5 16 extension for large line sizes 3 Replace the stem cap Tighten finger tight then tighten an additional 1 6 turn To Close Service Valve 1 Remove the stem cap with an adjustable wrench 2 Using the adjustable wrench to keep the valve station ary use a service wrench with a hex head extension to turn the stem clockwise to seat the valve Tighten the stem firmly NOTE Use a 3 16 h
17. ex head extension for 3 8 line sizes or a 5 16 extension for large line sizes 3 Replace the stem cap Tighten finger tight then tighten an additional 1 6 turn NOTE Stem cap must be replaced to help prevent valve leakage Service Valve Valve Closed ai cap service port insert hex to outdoor coil iF wrench here service port cap Schrader valve open to line set when valve is closed front seated valve front seated Service Valve Valve Open Page 6 IV CHARGING A WARNING R 410A refrigerant can be harmful if it is inhaled R 410A refrigerant must be used and recovered re sponsibly Failure to follow this warning may result in personal injury or death A Leak Testing After the line set has been connected to the indoor and out door units check the line set connections and indoor unit for leaks A IMPORTANT The Clean Air Act of 1990 bans the intentional venting of CFC s and HFC s as of July 1 1992 Approved methods of recovery recycling or reclaiming must be followed Fines and or incarceration my be levied for noncompliance A WARNING Fire Explosion and Personal Safety Hazard Failure to follow this warning could result in damage personal injury or death Never use oxygen to pressurize or purge refrigeration lines Oxygen when exposed to a spark or open flame can cause damage by fire and or an explosion that could result in personal injury or death A WARNING
18. g 3 Use a temperature pressure chart for R 410A table 5 to determine the saturation temperature for the liquid line pressure reading record in table 6 4 Subtract the liquid line temperature from the saturation temperature according to the chart to determine the subcooling value N 31 6 65 0 111 370 0 39 0 42 7 80 2 854 115 390 7 16 3960 117 401 3 119 70 0 274 1 423 2 622 7 122 428 8 153 630 1 5 Compare the subcooling value with those in table 6 If sub 172 6 282 3 123 434 5 637 5 cooling value is greater than shown recover some re 175 4 286 5 124 4402 645 0 frigerant if less add some refrigerant TABLE 6 Subcooling Values For TXV Systems Outdoor Liquid Subcooling 1 F 6 C Temp 5 2 785 fat 38 98 1 84 m pe ppp pepe Fe ppm r e er ra 77 41 75 88 84 N EEE AR N Jeees 1 N 3 3 35 AJON wo 75 1 wo a A A AJA A a oo N N wo wo N Co ER CE Go oo oo oo S oOo do o a N N N o a ASAI RR O c1 NIN 06 7 E A A ALA wl w w R3 NIN NIN Sala Aje o ojal MD a ny a on A Io P a eo N o X ajo NIN A Aa ayo N coo cg B amp B BPR RR 91g o SINIO i A Gd PO gt BIS am IEEE RN 95 wo 75 82 780 38 81 99 amp 1 5 77 83 8 35 81 99 75 50 1 79 84
19. lanks of the scrolls figure 6 2 As the orbiting motion contin ues the gas is forced toward the center of the scroll and the gas pocket becomes compressed figure 6 3 When the com pressed gas reaches the center it is discharged vertically into a chamber and discharge port in the top of the compressor figure 5 The discharge pressure forcing down on the top scroll helps seal off the upper and lower edges tips of the scrolls figure 5 During a single orbit several pockets of gas are compressed simultaneously providing smooth continuous compression The scroll compressor is tolerant to the effects of liquid return If liquid enters the scrolls the orbiting scroll is allowed to separate from the stationary scroll The liquid is worked toward the center of the scroll and is discharged If the compressor is replaced conventional Lennox cleanup practices must be used Due to its efficiency the scroll compressor is capable of draw ing a much deeper vacuum than reciprocating compressors Deep vacuum operation can cause internal fusite arcing resulting in damaged internal parts and will result in com pressor failure Never use a scroll compressor for eva cuating or pumping down the system This type of dam age can be detected and will result in denial of warranty claims The scroll compressor is quieter than a reciprocating com pressor however the two compressors have much different sound characteristics The sounds made by a
20. ngth is greater than 15 ft 4 6 m add this amount If line length is less than 15 ft 4 6 m subtract this amount A IMPORTANT Mineral oils are not compatible with R 410A If oil must be added it must be a polyol ester oil NOTE The compressor is charged with sufficient polyol es ter oil for line set lengths up to 50 feet 15 2 m If oil must be added to the compressor in the field Copeland has ap proved Mobil EAL Arctic 22CC and ICI EMKARATE RL32CF Checking Charge The outdoor unit should be charged during warm weather However applications arise in which charging must occur in the colder months The method of charging is determined by the unit s refrigerant metering device and the outdoor ambient temperature Measure the liquid line temperature and the outdoor ambi ent temperature as outlined below 1 Connect the manifold gauge set to the service valves e low pressure gauge to vapor valve service port e high pressure gauge to liquid valve service port Close manifold gauge set valves Connect the center manifold hose to an upright cylinder of R 410A 2 Set the room thermostat to call for heat This will create the necessary load for properly charging the system in the cooling cycle 3 Use a digital thermometer to record the outdoor ambient temperature 4 When the heating demand has been satisfied switch the thermostat to cooling mode with a set point of 68 F 20 C When pressures have s
21. o evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns 29 9 inches of mercury within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves 9 When the absolute pressure requirement above has been met disconnect the manifold hose from the vacu um pump and connect it to an upright cylinder of R 410A refrigerant Open the manifold gauge valves to break the vacuum from 1 to 2 psig positive pressure in the line set and indoor unit Close manifold gauge valves and shut off the R 410A cylinder and remove the manifold gauge set C Charging This system uses R 410A refrigerant which operates at much higher pressures than R 22 The provided liquid line filter drier is approved for use with R 410A Do not replace it with components designed for use with R 22 This unit is NOT approved for use with coils which use capillary tubes as a refrigerant metering device Factory Charge Units are factory charged with the amount of R 410A refrig erant indicated on the unit rating plate This charge is based on a matching indoor coil and outdoor coil with 15 ft 4 6 m line set For varying lengths of line set refer to table 2 for re frigerant charge adjustment TABLE 2 Refrigerant Charge per Line Set Lengths Liquid Line Oz per 5 ft g per 1 5 m adjust Set Diameter from 15 ft 4 6 m line set 3 8 in 9 5 mm 3 ounce per 5 ft 85 g per 1 5 m NOTE If line le
22. re 8 if condenser fan motor replacement is necessary A DANGER Make sure all power is disconnected before beginning electrical service procedures Remove screws HL gt S d N i DN screws FIGURE 7 Page 5 a p ALIGN FAN HUB FLUSH WITH END OF SHAFT FIGURE 8 D Loss of Charge Switch option An auto reset single pole single throw low loss of charge switch is located in the suction line This switch shuts off the compressor when suction pressure drops below the factory setting The switch is closed during normal operating pres sure conditions and is permanently adjusted to trip open at 25 5 psi The switch automatically resets when suction line pressure rises above 55 5 psi rises to 55 5 psig E High Pressure Switch 13ACX units are equipped with a high pressure switch that is located in the liquid line The switch SPST manual reset normally closed removes power from the compressor con tactor control circuit when discharge pressure rises above factory setting at 590 10 psi lll REFRIGERANT SYSTEM A Plumbing Field refrigerant piping consists of liquid and suction lines from the condensing unit sweat connections to the indoor evaporator coil sweat connections Use Lennox L15 sweat series line sets as shown in table 1 TABLE 1 EIE ER NLL 3 8 in 3 4 in e 10 mm 19 mm 4 6 m 15m 3 8 in 7 8 in ec 10 mm 22 mm 4 6 m 15 m dom Wem rat
23. t port to ensure the refrigerant you added is adequate to be detected Amounts of refrigerant will vary with line lengths Check all joints for leaks Purge nitrogen and R 410A mixture Correct any leaks and recheck B Evacuating Evacuating the system of noncondensables is critical for proper operation of the unit Noncondensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Noncondensables and water vapor combine with refrigerant to produce substances that corrode copper pip ing and compressor parts NOTE This evacuation process is adequate for a new installation with clean and dry lines If excessive mois ture is present the evacuation process may be required more than once A IMPORTANT Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns Use an instrument that reads from 50 microns to at least 20 000 microns 1 Connect manifold gauge set to the service valve ports e low pressure gauge to vapor line service valve e high pressure gauge to liquid line service valve 2 Connect micron gauge 3 Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set 4 Open both manifold valves and start the vacuum pump 5 Evacuate the line set and indoor unit to an absolute pressure of 23 000 microns 29 01 inches of mercury During the early stages of evacuation it is
24. t resulting from Flood wind lightning or installation and operation IV Charging 42s ihr pene dee ee Page 7 in a corrosive atmosphere chlorine fluorine salt recycled waste water urine fertilizers or other dam VI Maintenance 4 Page 11 aging chemicals VII Wiring and Sequence of Operation Page 12 Technical Publications Page 1 2006 Lennox Industries Inc SPECIFICATIONS General Model No 13ACX 018 13ACX 024 13ACX 030 13ACX 036 13ACX 042 13ACX 048 13ACX 060 Data Nominal Tonnage kW 1 5 5 3 2 7 0 2 5 8 8 3 10 6 3 5 12 3 4 14 1 5 17 6 Connections Liquid line o d in mm 3 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 sweat Suction line o d in mm 3 4 19 1 3 4 19 1 3 4 19 1 7 8 22 2 7 8 22 2 7 8 22 2 1 1 8 28 6 1 Refrigerant R 410A furnished 4 Ibs 7 oz 11 Ibs 2 oz 2 01 kg 2 21 kg 2 81 kg 2 92 kg 4 03 kg 3 74 kg 5 05 kg Outdoor Net face area Outer coil 13 22 1 23 15 11 1 40 13 22 1 23 13 22 1 23 15 11 1 40 16 33 1 52 24 50 2 28 Tube diameter in mm 5 16 8 5 16 8 5 16 8 5 16 8 5 16 8 5 16 8 Number of rows 1 2 2 2 2 2 Fins per inch m 22 866 22 866 22 866 22 866 22 866 22 866 Outdoor Diameter in mm 18 457 18 457 18 457 18 457 22 559 22 559 ran Number of blades 3 4 4 4 4 4
25. tabilized use a digital thermometer to record the liquid line temperature 5 The outdoor temperature will determine which charging method to use Proceed with the appropriate charging procedure Charge Using Weigh in Method Outdoor Temp lt 65 F 18 C If the system is void of refrigerant or if the outdoor ambient temperature is cool use the weigh in method to charge the unit Do this after any leaks have been repaired 1 Recover the refrigerant from the unit 2 Conduct a leak check then evacuate as previously out lined 3 Weigh in the charge according to the total amount shown on the unit nameplate If weighing facilities are not available or if you are charging the unit during warm weather use the approach method that follows Page 8 Charge Using Approach Method Outdoor Tem perature gt 65 F 18 C When charging an expansion valve system when the out door ambient temperature is 65 F 18 C or above it is best to charge the unit using the approach method Subtract the outdoor ambient temperature from the liquid line tempera ture to determine the approach temperature see table 3 The resulting difference approach temperature should agree with the values given in table 3 If not add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature Checking Charge Using Normal Operating Pres sures A IMPORTANT Use table 4 to perform mainten
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