C0A Series - HvacPartsShop.com
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1. The discharge pressure forcing down on the top scroll helps seal off the upper and lower edges tips of the scrolls figure 6 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 al lowed 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 ORBITING SCROLL Page 6 HOW A SCROLL WORKS V A ORBITING SCROLL SUCTION POCKET STATIONARY SCROLL V n HIGH PRESSURE GAS 3 MOVEMENT OF ORBIT SUCTION Y INTERMEDIATE PRESSURE d GAS CRESCENT SHAPED GAS POCKET 2 887 FLANKS MOVEMENT OF ORBIT SEALED BY CENTRIFUGAL FORCE ne 4 DISCHARGE POCKET FIGURE 7 Due to its efficiency the scroll compressor is capable of drawing a much deeper vacuum than reciprocating compressors Deep vacuum operation can cause in ternal fusite arcing resulting in damaged internal parts and will result in compressor failure Never use a scroll compressor for evacuating or pumping down the system This type of damage can be de tected and will result in denial of warranty claims The scroll compressor is quieter than a reciprocating compressor however the two compressors have much different sound ch2. 28 6 1ilRefrigerant charge furnished HCFC 22 5 Eas 2 1 5 PE Net face area sq ft m2 E Ee CHEN Ta 20 82 ura Condenser Ube diameter in mm 5 16 7 9 5 16 7 9 5 16 7 9 Coil No of rows 1 1 1 Fins per inch m 22 866 22 866 22 866 Diameter in mm 18 457 18 457 22 559 No of blades 4 4 4 Condenser Motor hp W 1 3 249 1 3 249 1 3 249 Fan Cfm L s 2800 1320 2950 1390 3900 1840 Rpm 1116 1100 1100 Watts 299 310 367 Shipping weight Ibs kg 1 package 138 63 196 890 199 90 OPTIONAL ACCESSORIES COA Compressor Crankcase Heater 90P12 90P12 90P12 Compressor Monitor Optional for Canada Only 45F08 45F08 45F08 Hail Guards 17L73 17L73 17L73 Low Ambient Kit for use with expansion valve systems only 24H77 24H77 24H77 Mounting Base 69J06 69J06 69J06 Timed Off Control 47J27 47J27 47J27 Unit Stand Off Kit 94J45 94J45 94J45 Variable field 1 Refrigerant charge sufficient for 20 ft 6 0 m length of refrigerant lines 69J0301 Page 2 69J0301 69J0301 ELECTRICAL DATA COA Model No COA 18 230 COA 24 230 30 230 C0A 36 230 C0A 42 230 COA 48 230 COA 60 230 Line voltage data 60 hz 1 phase 208 230v 208 230v 208 230v 208 230v 208 230v 208 230v 208 230v Rec max fuse circuit breaker size 20 25 30 35 40 50 60 amps 1 Minimum circuit ampacity 11 7 14 4 17 2 20 4 24 3 29 2 33 2 Rated load amps 7 95 10 1 1
3. 3 4 19 1 3 4 19 1 1 Refrigerant charge furnished HCFC 22 i B er S ee 2 e Net face area sq ft m2 10 46 0 97 10 46 0 97 10 46 0 97 11 41 1 06 Condenser Tube diameter in mm 5 16 7 9 57679 5 16 7 9 5 16 7 9 Coil No of rows 1 1 1 1 Fins per inch m 18 709 18 709 18 709 22 866 Diameter in mm 18 457 18 457 18 457 18 457 No of blades 3 3 3 3 Condenser Motor hp W 1 6 124 1 6 124 1 6 124 1 4 187 Fan Cfm L s 2170 1025 2170 1025 2170 1025 2510 1185 Rpm 1100 1100 1100 1103 Watts 254 254 254 266 Shipping weight Ibs kg 1 package 136 62 136 62 136 62 140 64 OPTIONAL ACCESSORIES COA Compressor Crankcase Heater 68887 68887 68887 68887 Compressor Monitor Optional for Canada Only 45F08 45F08 45F08 45F08 Hail Guards 17L71 17L71 17L71 17L73 Low Ambient Kit for use with expansion valve systems only 24H77 24H77 24H77 24H77 Mounting Base 69J06 69J06 69J06 69J06 Timed Off Control 47J27 47J27 47427 47427 Unit Stand Off Kit 94J45 94J45 94J45 94J45 Compressor Sound Cover 69J1701 69J1701 691701 53J3901 Variable field 1 Refrigerant charge sufficient for 20 ft 6 0 m length of refrigerant lines SPECIFICATIONS COA Model No COA 42 230 COA 48 230 COA 60 230 Nominal Tonnage kW 3 5 12 3 4 14 1 5 17 6 Liquid line o d connection sweat in mm 3 8 9 5 3 8 9 5 3 8 9 5 Suction line o d connection sweat in mm 7 8 22 2 7 8 22 2 1 1 8
4. 2450 1155 Rpm 1100 1100 1100 Watts 200 200 200 Shipping weight Ibs kg 1 package 155 70 175 79 180 82 OPTIONAL ACCESSORIES C2A Compressor Crankcase Heater 90P12 90P12 90P12 Compressor Sound Cover 69J0301 69J0301 69J0301 Hail Guards 17L73 17L73 17L73 Low Ambient Kit for use with expansion valve systems only 24H77 24H77 24H77 Mounting Base 69J06 69J06 69J06 Timed Off Control 47527 47J27 47J27 Unit Stand Off Kit 94J45 94J45 94J45 Compressor Monitor Optional for Canada Only 45F08 45F08 45F08 Variable field Refrigerant charge sufficient for 20 ft 6 0 m length of refrigerant lines Page 3 SPECIFICATIONS C2A Model No C2A 42 230 C2A 48 230 C2A 60 230 Nominal Tonnage kW 3 5 12 3 4 14 1 5 17 6 Liquid line o d connection sweat in mm 3 8 9 5 3 8 9 5 3 8 9 5 Suction line o d connection sweat in mm 7 8 22 2 7 8 22 2 1 1 8 28 6 Ibs 7 lbs 11 oz 10 Ibs 14 oz 11 Ibs 0 oz 1 Refrigerant charge furnished HCFC 22 kg 3 49 kg 4 93 kg 4 99 kg Netiate Outer coil 15 21 1 41 21 11 1 96 21 11 1 96 a Inner coil 14 50 1 35 20 31 1 89 20 31 1 89 er Tube diameter in mm amp no of rows 5 16 7 9 5 16 7 9 5 16 7 9 No of rows 2 2 2 Fins per inch m 22 866 22 866 22 866 Diameter in mm 18 457 22 559 22 559 No of blades 4 4 4 Condenser Motor W 1 3 249 1 3 249 1
5. 3 249 Fan Cfm L s 2930 1385 3890 1835 3890 1835 Rpm 1100 1085 1085 Watts 310 375 375 Shipping weight Ibs kg 1 package 186 84 250 113 254 115 OPTIONAL ACCESSORIES C2A Compressor Crankcase Heater 90P12 90P12 90P12 Compressor Sound Cover 00000 00000 00000 Hail Guards 11L73 11L74 11L74 Low Ambient Kit for use with expansion valve systems only 24H77 24H77 24H77 Mounting Base 69J06 69J07 69J07 Timed Off Control 47J27 47J27 47J27 Unit Stand Off Kit 94J45 94J45 94J45 Compressor Monitor Optional for Canada Only 45F08 45F08 45F08 Variable field 1 Refrigerant charge sufficient for 20 ft 6 0 m length of refrigerant lines ELECTRICAL DATA C2A Model No Line voltage data 60 hz 1 phase C2A 48 230 208 230v C2A 60 230 208 230v C2A 24 230 C2A 30 230 2 36 230 208 230v 208 230v 208 230v C2A 42 230 208 230v Rec max fuse circuit breaker size amps 20 30 35 40 50 Minimum circuit ampacity 14 0 Rated load amps 10 3 Compressor Locked rotor amps 56 0 Power factor 96 Condenser Coil Full load amps 1 1 Fan Motor Locked rotor amps 1 9 Variable Field 1 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus 10 and minus 5 of line voltage Page4 l UNIT INFORMATION COA condensing units are available in 1 1 2 2 2 1 2 3 3 1 2 4 an
6. 2 4 14 9 17 9 21 8 25 Compressor Locked rotor amps 48 3 60 69 4 96 103 103 170 Power factor 0 97 0 96 0 92 0 89 0 84 0 80 0 90 Condenser Full load amps 1 1 1 1 1 1 1 7 1 9 1 9 1 9 Coil E E E Fan Motor Locked rotor amps 1 9 1 9 1 9 3 1 4 1 4 1 4 1 Variable Field 1 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus 10 and minus 5 of line voltage 4 Most popular evaporator coil match SPECIFICATIONS C2A Model No C2A 24 230 C2A 30 230 C2A 36 230 Nominal Tonnage kW 2 7 0 2 5 8 8 3 10 6 Liquid line o d connection sweat in mm 3 8 9 5 3 8 9 5 3 8 9 5 Suction line o d connection sweat in mm 3 4 19 1 3 4 19 1 7 8 22 2 Ibs 5 Ibs 8 oz 7 Ibs 3 oz 7 Ibs 4 oz 1 Refrigerant charge furnished HCFC 22 ka 2 49 kg 3 26 kg 3 29 kg Net lace aiea c eq fime Outer coil 15 21 1 41 15 21 1 41 15 21 1 41 ee Inner coil 5 44 0 51 14 50 1 35 14 50 1 35 E Tube diameter in mm 5 16 7 9 5 16 7 9 5 16 7 9 No of rows 1 37 2 2 Fins per inch 22 866 22 866 22 866 Diameter in mm 18 457 18 457 18 457 No of blades 3 4 4 Condenser Motor hp W 1 6 124 1 6 124 1 6 124 Fan Cfm L s 2500 1180 2450 1155
7. 271 77 79 269 76 105 F 31 2 C TXV 82 279 80 292 79 299 77 305 79 80 306 78 These are typical pressures only Indoor evaporator match up indoor air quality and evaporator load will cause the pressures to vary Page 11 TABLE 7 C2A Model Units NORMAL OPERATING PRESSURES 2 30 C2A36 SUC LIQ OUTDOOR COIL La ENTERING AIR TEMPERATURE PSIG 82 F 47 2 C o a Ie er ease m 26 ICE 229 These are typical pressures only Indoor evaporator match indoor air quality and evaporator load will cause the pressures vary 2 RFCIV Systems The following procedures are intended as a general guide for use with RFCIV systems only For best results indoor temper ature should be between 70 F and 80 F 21 1 C and 26 7 Outdoor temperature should be 60 F 15 6 C or above Slight variations in charging temperature and pressure should be expected Large variations may indicate a need for further servicing TABLE 8 COA Model Units Temperature TUO coats 17 9 5 16 8 9 15 8 3 15 8 3 16 8 9 12 6 7 14 8 13 7 8 13 7 8 11 1 1418 96 12 6 7 12 6 7 110 915 11 709 1116 1 6 3 3 915 73 9 8 4 4 7 3 9 1015 6 5089 7 3 9 ean 915 4 2 2 613 3 6 3 3 6 2 8 5 2 8 1 7 115 46 4 4 3 9 3 3 3 3 8 1 Connect gauge manifold Connect an upright R 22 drum
8. BLE 1 Length of Liquid Line Suction Line cue user Medel No 070 or 8 re n Tmm m mm 10 15 21 20 20 6 coas 110152125 25 8 24 21 ss 11 so 15 7120 2 39 eem par i Tesa sw L10 15 41 20 20 6 30 eet runs oP ores so we MIENNE posne 2 e 222 EE d Field fabricate 38 95 716 285 Field fabricate TABLE 2 42 48 Condensing Unit L10 41 20 L10 41 30 L10 41 40 L15 41 40 L10 41 50 L15 41 50 L10 65 30 L10 65 40 L10 65 50 L15 65 50 C2A60 Not available 95 1 18 Field fabricate Service Valves The liquid and suction line service valves figures 9 10 and 11 and gauge ports are accessible from outside the unit The valve is equipped with a service port The service ports are used for leak testing evacuating charging and checking charge A schrader valve is factory installed A service port cap is supplied to protect the schrader valve from contamination and serve as the primary leak seal NOTE Always keep valve stem caps clean To Access Schrader Port 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6 turn To Open Liquid or Suction Line Service Valve 1 Remove stem cap with an adjustable wren
9. COA C2A Condensing Units 1 5 thru 5 Tons 5 3 to 17 6 kW 18 000 to 57 500 Btuh 5 3 to 16 9 kW Cooling Capacity SERVICE MANUAL RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE Corp 9911 L4 Revised 07 99 2 SERIES UNITS 18 230 CGT NOTE Shaded area denotes part of model no referenced in publication l Unit Type EENE C Condensing Unit l Options Heat Pump Outdoor Unit ex ee tiim G Government option r ma Voltage C Canadian Efficiency 230 208 230 1ph 60hz T Technicoat lo 10SEER 233 208 230v 3ph 60hz If unit has no options this section is excluded 1 11SEER D a 460 460v 3ph 60hz from the model number 12 125 Generation j 1575 575v 60hp _ beat ee Se Teu T Capacity Nominal G Gia 18 1 5 Ton Gray 24 2 Ton B Brown 30 2 5 Ton R Green 36 3 Ton LS Silver J 42 3 5 Ton a 48 4 Ton C Ton y The COA is a residential split system condensing unit Condensing coilsize circuiting and air volume resultin aminimum SEER rating of 10 0 The series is designed for use with an expansion valve or orifice system in the indoor unit All COA 1 1 2 to 3 ton units utilize reciprocating compressors All COA 3 1 2 to 5 ton units utilize scroll compressors It oper ates much like a standard condensing unit but the COA s scroll compressor
10. ING LUG FIGURE 3 A Control Box Figure 3 Electrical openings are provided under the control box cov er Field thermostat wiring is made to color coded pigtail connections 1 Compressor Contactor K1 The compressor is energized by acontactor located in the control box See figure 3 Single pole contactors are used in all COA C2A series units K1 is energized by the indoor thermostat terminal Y1 24V when thermostat demand is present COA C2A units are not equipped with a 24 volt transformer All 24 volt controls are powered by the indoor unit 2 Dual Capacitor C12 The compressor and fan in COA C2A series units use permanent split capacitor motors The capacitor is lo cated inside the unit control box see figure 3 A single dual capacitor C12 isusedforboth the fan motor and the compressor see unit wiring diagram The fan side andthe compressor side ofthe capacitor have different MFD ratings Capacitor ratings may change with com pressor B Compressor All COA 1 1 2 to 3 ton units utilize a conventional recip rocating compressor COA 3 1 2 to 5 ton units use scrolls See Electrical Data section for compressor specifications 5 SCROLL COMPRESSOR SUCTION FIGURE 4 All C2A units utilize a scroll compressor The scroll com pressor design is simple efficient and requires few mov ing parts A cutaway diagram of the scroll compressor is shown in figure 4 The scrolls are located i
11. a procedure for charging the system Minor varia 3 Operate indoor and outdoor units in cooling mode tions in these pressures may be expected due to Allow outdoor unit to run until system pressures sta differences in installations Significant deviations could mean that the system is not properly charged aa P or that a problem exists with some component in 4 Make sure thermometer well is filled with mineral oil the system Used prudently tables 6 and 7 could before checking liquid line temperature serve as a useful service guide 5 Place thermometer in well and read liquid line tem TABLE 5 perature Liquid line temperature should be warmer C2A than the outdoor air temperature Tables 4 and 5 APPROACH TEMPERATURE shows how many degrees warmer the liquid line LIQUID LINE F OUTDOOR AMBIENT F temperature should be C2A 24 10 F 5 5 C Addrefrigeranttolowertheliquidlinetempera C2A 30 8 F 4 4 C ture C2A 36 7 F 3 8 C 8 F 4 4 C Recover refrigerant to raise the liquid line tem perature C2A 42 TABLE 6 COA Model Units NORMAL OPERATING PRESSURES OUTDOOR COIL ENTERING AIR TEMPERATURE PSIG PSIG PSIG PSIG 65 F 18 3 C RFCIV 75 F 23 9 C RFCIV 85 F 29 4 C RFCIV 95 F 35 0 C RFCIV 105 F 40 6 C RFCIV 65 F 18 3 C TXV 75 F E A TXV 85 F 31 2 C TXV 95 F 31 2 C TXV 80 247 78 258 77 266 74
12. ace is pro vided on the unit rating plate to list actual field charge LIQUID LINE SET DIAMETER Ounce per 5 foot ml per mm adjust from 20 foot 6 1 m line set 1 4 in 6 mm 1 ounce per 5 feet 30 ml per 1524 mm 5 16 in 8mm 2 ounce per 5 feet 60 ml per 1524 mm 3 8in 10mm 3ounce per 5 feet 90 ml per 1524 mm If line set is greater than 20 ft 6 1 m add this amount If line set is less than 20 feet 6 1 m subtract this amount Units are designedfor line sets up to 50 ft 15 2 Con sult Lennox Refrigerant Piping Manual for line sets over 50 ft 15 2 m A IMPORTANT If line length is greater than 20 feet 6 1 m add this amount If line length is less than 20 feet 6 1 m subtract this amount A Pumping Down System A CAUTION Deep vacuum operation operating compressor at 0 psig or lower can cause internal fusite arcing resulting in a damaged or failed compressor This type of damage will result in denial of warranty claim The system may be pumped down when leak checking the line set and indoor coil or making repairs to the line set or indoor coil 1 Attach gauge manifold 2 Front seat close liquid line valve 3 Start outdoor unit 4 Monitor suction gauge Stop unit when 0 psig is reached 5 Front seat close suction line valve B Leak Testing To Be Done Before Evacuating 1 Attach gauge manifold and connect a drum of dry nitro gen to center port of ga
13. aracteristics The sounds made by a scroll compressor do not affect system reliability perfor mance or indicate damage See Electrical section for scroll compressor specifica tions C Condenser Fan Motor All COA C2A units use single phase PSC fan motors which require a run capacitor In all units the condenser fan is con trolled by the compressor contactor ELECTRICAL DATA tables in this manual show specifi cations for condenser fans used in COA C2As Access tothe condenser fan motor on all units is gained by removing the seven screws securing the fan assem bly See figure 8 The condenser fan motor is removed from the fan guard by removing the four nuts found on the top panel A DANGER Make sure all power is disconnected before beginning electrical service procedures CONDENSER FAN MOTOR AND COMPRESSOR ACCESS Remove 7 screws lt 4 REMOVE 7 SCREWS SECURING FAN GUARD REMOVE FAN GUARD FAN ASSEMBLY FIGURE 8 Remove 4 nuts Page 7 Ill REFRIGERANT SYSTEM A Plumbing Field refrigerant piping consists of liquid and suction lines from the condensing unit sweat connections to the indoor evaporator coil flare or sweat connections Use L10 flare or L15 sweat non flare series line sets as shown in tables 1 or 2 or use field fabricated refrigerant lines Separate discharge and suction service ports are pro vided outside the unit for connection of gauge manifold during charging procedure TA
14. ch 2 Using service wrench and hex head extension 5 16 for suction line and 3 16 for liquid line back the stem out counterclockwise until the valve stem just touches the retaining ring Replace stem cap tighten firmly Tighten finger tight then tighten an additional 1 6 turn A DANGER Do not attempt to backseat this valve Attempts to backseat this valve will cause snap ring to explode from valve body under pressure of refrigerant Personal injury and unit damage will result To Close Liquid or Suction Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Using service wrench and hex head extension 5 16 for suction line and 3 16 for liquid line turn stem clockwise to seat the valve Tighten firmly 3 Replace stem cap Tighten finger tight then tighten an additional 1 6 turn Page 8 LIQUID LINE SERVICE VALVE VALVE OPEN INSERT HEX STEM SERVICE PORT OUTLET TO dd PORT CAP SCHRADER VALVE INLET TO INDOOR COIL LIQUID LINE SERVICE VALVE VALVE CLOSED RETAINING RING STEM CAP INSERT HEX WRENCH HERE OUTLET TO COMPRESSOR SERVICE PORT CAP TO INDOOR COIL SCHRADER VALVE OPEN TO LINE SET WHEN VALVE IS VALVE FRONT CLOSED FRONT SEATED SEATED FIGURE 9 Suction Line Ball Type Service Valve COA 5 Ton and all C2A Units A ball type full service valve is used on all C2A model units and COA 5 ton units These suction line service valve
15. d 5 ton capacities C2A condensing units are avail able in 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 recommendations for the compressor to be covered under warranty Refer to the Engineering Hand book for approved system matchups A misapplied system will cause erratic operation and can result in early compressor fail ure Il UNIT COMPONENTS COA unit components are illustrated in figure 1 C2A compo nents are illustrated in figure 2 COA UNIT COMPONENTS OUTDOOR FAN MOTOR CONTROL LIQUID LINE SERVICE VALVE ourpoon 2 UNIT COMPONENTS FAN MOTOR CONTROL SUCTION LINE SUCTION LINE SERVICE VALVE DISCHARGE LINE SERVICE VALVE FIGURE 2 COA C2A UNIT CONTROL BOX M a L SS 1 2 DUAL CAPACITOR ah C12 COMPRESSOR CONTACTOR K1 GROUND
16. dicate a leak in the system and a repeat of the leak testing section would be necessary 3 After system has been evacuated to 29 inches 737mm close gauge manifold valves to center port stop vacuum pump and disconnect from gauge man ifold Attach an upright nitrogen drum to center port of gauge manifold and open drum valve slightly to purge line at manifold Break vacuum in system with nitro gen pressure by opening manifold high pressure valve Close manifold high pressure valve to center port 4 Close nitrogen drum valve and disconnect from gauge manifold center port Release nitrogen pres sure from system 5 Connect vacuum pump to gauge manifold center port Evacuate system through manifold service valves until vacuum in system does not rise above 5mm of mercury absolute pressure or 500 microns within a 20 minute period after stopping vacuum pump 6 After evacuation is complete close manifold center port and connect refrigerant drum Pressurize system slightly with refrigerant to break vacuum D Charging If the system is completely void of refrigerant the recom mended and most accurate method of charging is to weigh the refrigerant into the unit according to the total amount shown on the unit nameplate Also refer to the tables in the SPECIFICATIONS section of this manual Page 10 If weighing facilities are not available or if unit is just low on Add refrigerant slowly as the unit approaches the charge the follo
17. ed steps which correspond to circled numbers on the adjacent diagram 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 compressor 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 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 14
18. iates at Y1 in the thermostat 2 24VAC energizes compressor 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 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 13 C2A 2 THROUGH 5 TON OPERATING SEQUENCE O TO nte POWER 20 VA MINIMUN NEC CLASS 2 COMPRESSOR CONTACTOR GROUND POWER SOURCE ALTERNATE CONTACTOR AND_WIRING TO 24 vac rove SOURCE ZV V MINIMUN m DESCRIPTION KEY COMPONENT C CLASS 2 GON RES ERR NOTE Cz CAPACITOR DUAL FOR USE WITH COPPER CONDUCTORS IK T TACTOR COMPRESSOR ONLY REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER CURRENT PROTECTION SIZE WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUND IN ACCORDANCE WITH NATIONAL AND LOCAL CODES LINE VOLTAGE FIELD INSTALLED e wm CLASS VOLTAGE FIELD INSTALLED WIRING DIAGRAM COOLING sas CONDENSING UNI UNS _ UNIT C2AL 42 230 C2AL 48 230 C2AL 60 230 New Form 532 99 1W Litho U S A C2A 2 5 TON OPERATING SEQUENCE This is the sequence of operation for C2A 2 through 5 ton units The sequence is outlined by number
19. is unique in the way that it compresses refrigerant Compressors are hermetically sealed for long ser vice life The compressor is installed in the unit on resilient rub ber mounts to assure quiet vibration free operation A built in protection device assures protection from excessive current and temperatures Several models are available in sizes ranging from 1 1 2 through 5 tons Page 1 The C2A is a residential split system condensing unit The series is designed for use with expansion valve systems All C2A units utilize scroll compressors It operates much like a standard condensing unit but the C2A s scroll com pressor is unique in the way that it compresses refrigerant Several models are available in sizes ranging from 2 through 5 tons This manual is divided into sections which discuss the major components refrigerant system charging proce dure maintenance and operation sequence All specifications in this manual are subject to change SPECIFICATIONS COA Model No 18 230 COA 24 230 COA 30 230 36 230 Nominal Tonnage kW 1 5 5 3 2 7 0 2 5 8 8 3 10 6 Liquid line o d connection sweat in mm 3 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 Suction line o d connection sweat in mm 5 8 15 9 5 8 15 9
20. n the top of the compressor can and the motor is located just below The oil level is immediately below the motor The scroll is a simple compression concept centered around the unique spiral shape of the scroll and its in herent properties Figure 5 shows the basic scroll form Two identical scrolls are mated together forming concen tric spiral shapes figure 6 One scroll remains stationary while the other is allowed to orbit figure 7 Note that the orbiting scroll does not rotate or turn but merely or bits the stationary scroll NOTE During operation the head of a scroll compres sor may be hot since it is in constant contact with dis charge gas SCROLL FORM FIGURE 5 CROSS SECTION OF SCROLLS DISCHARGE STATIONARY SCROLL DISCHARGE PRESSURE LLL SSS SY 4 NG LL ns S A SN SS SS SY SS ESERIES ET ARRAS SS Y WA TIPS SEALED BY DISCHARGE PRESSURE FIGURE 6 The counterclockwise orbiting scroll draws gas into the outer crescent shaped gas pocket created by the two scrolls figure 7 1 The centrifugal action of the orbiting scroll seals off the flanks of the scrolls figure 7 2 As the orbiting motion continues the gas is forced toward the center of the scroll and the gas pocket becomes com pressed figure 7 3 When the compressed gas reaches the center it is discharged vertically into a chamber and discharge port in the top of the compressor figure 6
21. re lubricated and need no further oil ing 3 Check all wiring for loose connections 4 Check for correct voltage at unit 5 Check amp draw on blower motor Unit nameplate Actual Page 12 VI WIRING DIAGRAMS AND SEQUENCE OF OPERATION COA 1 1 2 THROUGH 5 TON OPERATING SEQUENCE OUTDOOR FAN TO 24 VAC POWER SOURCE COMPRESSOR CONTACTOR POWE SOURCE ALTERNATE CONTACTOR AND WIRING TO 24 VAC POWER D m DESCRIPTION F SOURCE 20VA IKEY _ COMPONENT 08 IBT COMPRESSOR MINIMUM NEC CLASS 2 ID4 MOTOR OUTDOOR FAN iCi2__ CAPACI TOR DUAL CONTACTOR COMPRESSOR CURRENT PROTECTION g IZE WARNING ELECTRIC Win ict HAZARD CAUSE INJURY OR EATH UNIT MUST BE GROUND IN ACCORDANCE WITH NATIONAL AND LOCAL CODES LINE VOLTAGE FIELD INSTALLED uw CLASS 11 VOLTAGE FIELD INSTALLED WIRING DIAGRAM COOLING UNI UNITS C CONDENSING UNITS GOAL 15 230 iB 230 Pr eau 42 230 42 230 COAL 24 230 0 L 48 230 COAL 30 230 0 COAL 60 230 COAL 36 230 addi A COA 1 1 2 5 TON OPERATING ee This is the sequence of operation for COA 1 1 2 through 5 ton units The sequence is outlined by numbered steps which correspond to circled numbers on the adjacent diagram 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 init
22. s function the same way differences are in construction Valves are not rebuildable If a valve has failed it must be replaced A ball valve is illustrated in figure 11 The ball valve is equipped with a service port A schrader valve is factory installed A service port cap is supplied to pro tect the schrader valve from contamination and assure a leak free seal Page 9 SUCTION LINE SERVICE VALVE VALVE OPEN INSERT HEX STEM WRENCH HERE Sie CAP INLET TO INDOOR COIL nl OUTLET TO COMPRESSOR SERVICE gt O SUCTION LINE SERVICE VALVE VALVE CLOSED M SERVICE PORT CAP INLET TO RETAINING RING STEM CAP INDOOR COIL N A OF VALVE FRONT e D SERVICE PORT CAP SCHRADER VALVE OPEN TO LINE SET WHEN VALVE IS OUTLET TO CLOSED FRONT SEATED COMPRESSOR FIGURE 10 SUCTION LINE BALL TYPE SERVICE VALVE VALVE OPEN USE ADJUSTABLE WRENCH ROTATE STEM CLOCKWISE 90 TO CLOSE ROTATE STEM COUNTER CLOCKWISE 90 TO OPEN INLET STEM FROM INDOOR COIL SHOWN OPEN OUTLET TO COMPRESSOR SERVICE PORT CAP 69 Ne SCHRADER CORE FIGURE 11 IV CHARGING The unit is factory charged with the amount of R 22 refrig erant indicated on the unit rating plate This charge is based on a matching indoor coil and outdoor coil with a 20 foot 6 1 m line set For varying lengths of line set refer to table 3 for refrigerant charge adjustment A blank sp
23. to center port of gauge manifold 2 Operate indoor and outdoor units Allow outdoor unit to run until system pressures stabilize 3 Make sure thermometer wellis filled with mineral oil before checking liquid line temperature 4 Read liquid line pressure and convert to con densing temperature usingtemperature pres sure conversion chart Condensing temperature read from gauges should be warmer than liquid line temperature 5 Place thermometer in well and read liquid line tem perature Table 8 shows how much warmer the con densing temperature should be 6 Subtract liquid line temperature from condens ing temperature to determine subcooling Compare with table 8 Add refrigerant to lower liquid line temperature Recover refrigerant to raise liquid line temp 7 When unit is properly charged liquid line pres sures should approximate table 6 E Oil Charge Refer to compressor nameplate V MAINTENANCE At the beginning of each heating or cooling season the system should be cleaned as follows A Outdoor Unit 1 Clean and inspect condenser coil Coil may be flushed with a water hose 2 Visually inspect all connecting lines joints and coils for evidence of oil leaks B Indoor Coil 1 Clean coil if necessary 2 Check connecting lines and coil for evidence of oil leaks 3 Check condensate line and clean if necessary C Indoor Unit 1 Clean or change filters 2 Bearings are p
24. uge manifold 2 Open high pressure valve on gauge manifold and pressurize line set andindoor coil to 150 psig 1034 kPa 3 Check lines and connections for leaks NOTE If electronic leak or Halide detector is used add a small amount of R 22 3 to 5 psig 20kPa to S4kPa then pressurize with nitrogen to 150 psig 4 Release nitrogen pressure from the system correct any leaks and recheck A CAUTION When using dry nitrogen a pressure reducing reg ulator must be used to prevent excessive pres sure in gauge manifold connecting hoses and within the system Regulator setting must not ex ceed 150 psig 1034 kpa Failure to use a regulator can cause equipment failure resulting in injury C Evacuating the System 1 Attach gauge manifold Connect vacuum pump with vac uum gauge to center port of gauge manifold With both manifold service valves open start pump and evacuate indoor coil and refrigerant lines A IMPORTANT A temperature vacuum gauge mercury vacuum U tube or thermocouple gauge should be used The usual Bourdon tube gauges are not accurate enough in the vacuum range A IMPORTANT The compressor should never be used to evacu ate a refrigeration or air conditioning system 2 Evacuate the system to 29 inches 737mm vacuum During the early stages of evacuation it is desirable to stop the vacuum pump at least once to determine if there is a rapid loss of vacuum A rapid loss of vacuum would in
25. wing procedure applies correct temperature This will allow refrigerant 1 Expansion Valve Systems to stabilize allowing the correct temperature to The following procedures are intended as a general guide for be read use with expansion valve systems only For best results in TABLE 4 door temperature should be between 70 F and 80 F 21 1 C and 26 7 C Outdoor temperature should be 60 F 15 6 C or Approach Temperature above Slight variations in charging temperature and pressure Liquid Line F C should be expected Large variations may indicate need for Outdoor Temperature F C further servicing A IMPORTANT The following procedure requires accurate read ings of ambient outdoor temperature liquid tem perature and liquid pressure for proper charging Use a thermometer with accuracy of 2 F 1 1 C Note For best results the same electronic thermometer should be and a pressure gauge with accu racy of 5 PSIG used to check both outdoor and liquid temperatures 34 5 kPa 6 When unit is properly charged liquid line pressur es should approximate those in tables 6 and 7 Ambient Temperature of 60 F 16 C or Above A IMPORTANT APPROACH METHOD TXV SYSTEMS 1 Connect gauge manifold Connect an upright R 22 drum to center port of gauge manifold Use tables 6 and 7 as a general guide for perform ing maintenance checks Tables 6 and 7 are is not 2 Record outdoor air ambient temperature
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