Carrier 07KA User's Manual
Contents
1. 3 Carrier id 5 ge 6 F is q 4 Water Cooled Condensing Units Pr gA Table 1 Physical Data CONDENSING UNIT 07KA 002 004 REFRIG CHG R 22 Ib 25 3 0 COMPRESSOR Single phase 06AD126 06AD228 3 phase 06AC228 Oi Charget pt 25 CONDENSER Tube in Tube HIGH PRESSURESTAT Cutout 428 5 psig Cut in 320 20 psig Fixed Differential 108 psig LOW PRESSURESTAT Cutout 30 4 psig Cut in 60 15 psig Fixed Differential 30 psig Factory charge Refer to Refrigerant Charging page 3 for charging details Use Carrier PP 33 2 Texaco Capella BI or Suniso 3G Dual Inhibited oil NOTE High and low pressurestats cut in and cutout points are not adjustable Table 2 Electrical Data 60 Cycle Fig 1 O7KA Water Cooled Condensing Unit a BRANCH CIRCUIT UNIT LRA FLA He WSA li a poe Fuse O7KA Ize n Ize zi Amp AWG No Wire AWG No Wire 002310 si 230 490 120 275 74 20 004310 730 171 50 82 30 004510 535 103 50 103 20 NDSV Nominal Distribution System Voltage Application Range Motors and controls will operate satisfactorily 10 above and 10 below Nominal Distribution System Voltage LRA Locked Rotor Amps FLA Full Load Amps Maximum dual element fuse size NOTES 1 Control circuit voltage is 24 volts on all units 2 Branch circuit wire sizes and corresponding maximum wire lengths tabulated will result in a 1 voltage drop at nameplate ful2. 110 F and 120 F condensing temperature For maximum capacity with thermal expansion valve systems slightly more charge is required than will be provided by the above procedure To achieve this optimum charge proceed as follows 1 Charge per above 2 Holding pressure at liquid valve by hand throt tling the condenser water to a corresponding saturation temperature of approximately 115F add refrigerant charge until actual liquid tem perature at this point is approximately 97 F 18 F liquid subcooling 3 In any case do not charge system to more than 3 lb for systems with 002 and 003 size coils and 4 lb for systems with 004 and 005 size coils CHECKING COMPONENTS Refer to Carrier Standard Service Techniques Manual Chapter 2 for complete instructions on checking electrical components PUMPDOWN PROCEDURE O7KA units may be pumped down in order to make repairs on low side of system without losing complete refrigerant charge 1 Attach pressure gage to suction service valve gage port 2 Front seat liquid line valve 3 Jumper low pressure switch 4 Start unit and run until the suction pressure reaches 5 psig Should the compressor go off on internal overload or high pressurestat be fore suction pressure reaches 5 psig shut off suction valve and vent remaining refrigerant 5 Shut unit off and front seat suction valve 6 Vent remaining pressure to atmosphere NOTE The 07KA condenser will not hold a co
3. ing charge Table 1 for complete system when combined with Carrier approved capillary controlled evap orator sections and with a Carrier accessory precharged tubing package in 10 or 18 ft lengths Additional charge may be required on other sys tems Add a crankcase heater to 07KA002 when factory charge is exceeded Crankcase heater available from Carrier Service Parts Center part no HT32AZ242 Do not use condensing unit charge for purging evaporator or tubing systems Refer to Carrier Standard Service Techniques Manual Chapter 1 for system evacuation de hydration instructions and details of charging methods listed below Service valve access cover is provided to accommodate charging lines Replace cover when finished Weight Method Systems with capillary tube con trol are recharged by weight only Refer to Table 1 for correct system charge Blow any refrig erant remaining in system before recharging When interconnecting tubing is shorter than 10 ft or longer than 18 ft add subtract charge as follows 3 4 oz per 10 ft of 5 16 in OD liquid line 1 1 2 oz per 10 ft of 3 8 in OD liquid line Sight Glass Method A satisfactory operating charge for thermal expansion valve controlled systems can be obtained by weighing in the refrig erant charge shown in Table 1 for capillary feed coil systems Then if liquid line sight glassis not clear add refrigerant until sight glass clears at an operating condition of between
4. l load amperage WSA Wire Sizing Amps Open water supply valve and allow water to reach condenser Water regulating valve re stricts water until unit is operating Open condenser water discharge valve when used START UP INSTRUCTIONS 2 Crankcase heater on 07KA004 should be en ergized a minimum of 4 hours before starting unit O7KA single phase units are of split capac itor PSC type and require an equalized system 3 Close disconnects energizing entire system pressure to start 4 Set room thermostat to desired temperature Start Procedure 5 Set room thermostat to Cool and fan switch as desired 1 Back seat open liquid and suction line serv ice valves When accessory water regulating valve is used crack liquid line service valve one half turn from backseat position Motors and controls willoperate satisfactorily 10 above and 10 below nominal distribution system voltage see Table 2 Carrier Corporation 1967 Printed in U S A 5 67 O7KA 1SS COMPRESSOR When supply voltage is within 10 limit and compressor does not start give compressor a temporary capacitance boost Use a start booster assembly Run compressor for 10 minutes then shut off and allow system pressure to equalize Try re starting without boost capacitor If after two at temps the compressor does not start add an accessory start capacitor relay package The accessory start relay used with the 06A compressor has a curre
5. m 7 plete system refrigerant charge At 120 F con densing temperature the condenser will hold approximately 2 lb of refrigerant 22 PRESSURE RELIEF PLUG This plug is a protective device which melts at 200 F relieving excess system pressure Re move when soldering on suction tube For plug replacement order Carrier part no EK0O2JA203 COMPATIBLE FITTING REPAIR Leaking Mechanical Connection Front seat con densing unit service valves and relieve refrigerant pressure in tubing Back lock nut off compatible fitting onto tube Cut fitting with hacksaw between threads and seal ring bead as shown in Fig 2 Remove tubing section remaining in threaded portion of fitting Discard lock nut Clean flux and insert new tube end into re maining portion of compatible fitting Heat and apply low temperature 450 F solder CAUTION Service valves have teflon washer Do not overtighten finger pressure will seal or overheat Do not exceed 10 ft lb torque when tightening and wrap valve base in wet rag wken soldering Leaking Sweat Connection Front seat service valves and relieve refrigerant pressure intubing Clean and flux area around leak and apply low temperature 450 F solder Evacuate or purge evaporator coil and tubing system Add refrigerant charge see charging instructions CUT HERE mi Fig 2 Repair of Mechanical Connection CONDENSER If excessive discharge pre
6. nt limiting device to pro tect the compressor in case of relay malfunction An open current limiting device indicates that the relay must be changed Compressor Protection 07KA units have a high pressurestat located on liquid service valve and a low pressurestat located on suction service valve See Table 1 for high and low pressure stat settings Single phase compressor motors are protected by an internal current temperature sensitive overload Three phase compressors are pro tected by internal thermostat and external current overloads Internal temperature sensitive over loads reset automatically when internal motor temperatures drop to a safe level Overloads may require up to 30 minutes to reset When an internal overload is suspected of being open check by using an ohmmeter or con tinuity tester Refer to the Carrier Standard Serv ice Techniques Manual Chapter 2 for complete instructions Compressor Removal 1 Shut off power to unit Vent refrigerant to at mosphere or use refrigerant removal methods described in Carrier Standard Service Tech niques Manual Chapter 1 2 Remove both unit top cover and wrap around enclosure 3 Remove compressor power leads from unit contro box and pressure relief plug from suc tion line Unsweat suction and hot gas lines from compressor 4 Remove compressor hold down bolts Lift compressor out thru top of unit REFRIGERANT CHARGING O7KA units contain correct operat
7. ssure is experienced with normal water flow the cordenser tubes may be fouled and require cleaning Contact a local water treatment firm for details on chemical cleaning LUBRICATION Compressor contains factory oil charge When oil is lost see Table 1 for oil charge and Carrier Standard Service Techniques Manual Chapter 1 page 1 21 for instructions Unit Cycles on High Pressure Switch 1 Insufficient water pressure to unit 2 Defective water control valve 3 Condenser water tube clogged 4 Water drain line clogged 5 Liquid Line valve closed 6 Excessive refrigerant charge Unit Cycles on Low Pressure Switch 1 Defective expansion valve 2 Unit short of refrigerant 3 Fan not running 4 Clogged filter 5 Suction line valve closed 6 Plugged capillary Unit Runs But Insufficient Cooling 1 Water control valve set too low TROUBLE SHOOTING wa AeA WwW N Dirty air filter Low refrigerant charge Defective expansion valve Coil slightly iced low air supply Unit Will Not Run Contactor Open 1 Defective transformer 2 Thermostat circuit open 3 Faulty control relay 4 5 6 7 Overload open High pressure switch open Low pressure switch open Loose electrical connection Unit Will Not Run Contactor Closed L 2 3 Loose lead at compressor Loose lead at contactor Motor winding open Manufacturer reserves the right to change any product specifications wi
8. thout notice Tab 4 O7KA 1SS New 5 67 Codes C and MB Catalog No 530 717
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