Carrier R-22 Application Manual And Service Manual
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Carrier R-22 Application Manual And Service Manual

Carrier R-22 Application Manual And Service Manual

Air conditioners and heat pumps using r-22 refrigerant
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Visit www.carrier.com
NOTE: Read the entire instruction manual before starting the
installation.
This symbol
indicates a change since the last issue.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS .....................................................2
INTRODUCTION ..........................................................................2
INSTALLATION GUIDELINE ....................................................2
Residential New Construction ..................................................2
Add-On Replacement (Retrofit) ...............................................2
Seacoast (For Air Conditioners Only) .....................................2
ACCESSORY DESCRIPTIONS ...................................................2
Compressor Crankcase Heater..................................................2
Evaporator Freeze Thermostat..................................................2
Winter Start Control .................................................................2
Compressor Start Assist-PTC ................................................2
Compressor Start Assist-Capacitor/Relay..............................2
Low-Ambient Controller ..........................................................2
MotorMaster™ Control ............................................................2
Low-Ambient Pressure Switch.................................................2
Wind Baffle...............................................................................3
Coastal Filter.............................................................................3
Support Feet ..............................................................................3
Liquid-Line Solenoid Valve .....................................................3
Thermostatic-Expansion Valve.................................................3
Isolation Relay ..........................................................................3
LOW-AMBIENT GUIDELINE.....................................................3
LONG-LINE GUIDELINE............................................................3
Approved Systems ....................................................................3
Interconnecting Tubing Sizing .................................................3
Metering Device Sizing ............................................................5
Charging Information................................................................6
2-Speed Applications ...............................................................7
UNIT IDENTIFICATION .............................................................9
Serial Number Identification ..................................................10
CABINET.....................................................................................10
Remove Top Cover-WeatherMaker™ ...................................10
Information Plate-WeatherMaker™.....................................11
Control-Box Cover-Cube Products......................................11
Remove Top Cover-Cube Products.....................................11
ELECTRICAL..............................................................................12
Aluminum Wire ......................................................................12
Contactors................................................................................13
Capacitors................................................................................14
Cycle Protector........................................................................16
Crankcase Heater ....................................................................16
Time-Delay Relay...................................................................17
Pressure Switches....................................................................18
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1 4 4
PC 101
Tab 3a 5a 2a 5a
Application Guide
and Service Manual
Catalog No. 563-732
Printed in U.S.A.
Air Conditioners and
Heat Pumps Using
Defrost Thermostats................................................................18
Defrost-Control Board ............................................................18
Fan Motors ..............................................................................22
Service Alarm Control Board.................................................23
Outdoor Thermostat(s)............................................................24
Compressor Plug.....................................................................24
Low-Voltage Terminals ..........................................................24
RECIPROCATING COMPRESSOR ..........................................25
Mechanical Failures ................................................................25
Electrical Failures ...................................................................26
System Cleanup After Burnout ..............................................27
Compressor Removal And Replacement ...............................28
COPELAND SCROLL COMPRESSOR ....................................28
Features ...................................................................................28
Troubleshooting ......................................................................28
Discharge Thermostat .............................................................28
Discharge Solenoid Valve ......................................................29
MILLENNIUM SCROLL COMPRESSOR ................................29
Features ...................................................................................29
Compressor Protection............................................................29
Troubleshooting ......................................................................29
Scroll-Compressor, 3-Phase Monitor.....................................29
OLYMPIA SERIES HORIZONTAL UNITS .............................29
General ....................................................................................29
Remove Fan Motor.................................................................31
Cleaning Coil ..........................................................................31
TWO-SPEED SYSTEM ..............................................................31
Cautions and Warnings...........................................................31
System Functions ....................................................................31
Factory Defaults......................................................................34
Major Components..................................................................34
LED Function/Malfunction Lights .........................................36
Troubleshooting ......................................................................36
REFRIGERATION SYSTEM .....................................................38
Refrigeration Cycle.................................................................38
Leak Detection ........................................................................38
Brazing ....................................................................................39
Service Valves ........................................................................39
Reversing Valve......................................................................41
Thermostatic-Expansion Valves (TXV).................................42
Coil Removal ..........................................................................43
Liquid-Line Strainer (Heat Pumps Only) ..............................43
Accumulator ............................................................................43
Contaminant Removal ............................................................45
System Charging.....................................................................45
Checking Charge.....................................................................45
CARE AND MAINTENANCE...................................................46
Form 38-10SM
Pg 1
R-22 Refrigerant
11-00
Replaces: 38-1SM, 38-16XA

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Summary of Contents for Carrier R-22

  • Page 1: Table Of Contents

    Air Conditioners and Heat Pumps Using R-22 Refrigerant Visit www.carrier.com Application Guide and Service Manual NOTE: Read the entire instruction manual before starting the Defrost Thermostats..............18 installation. Defrost-Control Board ............18 Fan Motors ................22 This symbol indicates a change since the last issue.

  • Page 2: Safety Considerations

    Continue to Service and repair of these units should be attempted only by trained service technicians familiar with Carrier standard service monitor pressure drop across suction-line filter drier. After 10 hr of run time, remove suction-line filter drier and replace instructions and training manual.

  • Page 3: Wind Baffle

    ** Required on Heat Pumps only. Step 9—Wind Baffle LONG-LINE GUIDELINE This Long-Line Application Guideline applies to all Carrier A field-fabricated sheet-metal cover used to stop prevailing winds residential air conditioner and heat pump split systems that have a or where outdoor ambient temperature is less than 55°F during unit nominal capacity of 18,000 to 60,000 Btuh.
  • Page 4 (5.56 x 9.53) SLOT 4 REQ'D (3.45) DIA HOLE 2 REQ'D (9.6) (154.0) SUPPORT (12.7) MAT'L: 18 GA STEEL (11.6) (12.7) (3.45) DIA HOLE 1 REQ'D (11.6) (5.56) DIA HOLE 3 REQ'D (6.3) (6.3) BAFFLE (5.56 x 50.8) SLOT MAT'L: 20 GA STEEL SCREW 10 REQ'D SUPPORT...

  • Page 5: Metering Device Sizing

    Table 2—Wind Baffle Dimensions for WeatherMaker™ Units with Star-Burst Top (In.) UNIT SIZE UNIT HEIGHT 21-7/8 25-1/4 10-3/8 19-3/4 20-1/2 19-11/16 20-7/16 19-5/8 6-1/8 Small 27-1/2 25-7/8 25-1/4 10-3/8 23-3/4 24-1/2 23-11/16 24-7/16 23-5/8 11-7/8 6-1/8 31-7/8 25-1/4 10-3/8 29-3/4 30-1/2 29-11/16 30-7/16 29-5/8 14-7/8 6-1/8...

  • Page 6: Charging Information

    Since long-line applications only valve within liquid line, 2 considerations must be made: involve 3/8-in. liquid lines, the additional refrigerant charge required is 0.6 oz of Refrigerant 22 (R-22) per ft of 3/8-in. liquid 1. Direction of flow arrow line over 15 ft.

  • Page 7: 2-Speed Applications

    Table 4—Wind Baffle Dimensions for Cube Units (In.) UNIT SIZE UNIT HEIGHT 21-15/16 19-7/8 13-3/4 28-1/8 10-11/16 20-1/4 11-11/16 3-13/16 19-13/16 17-13/16 23-15/16 21-7/8 13-3/4 28-1/8 10-11/16 20-1/4 11-11/16 3-13/16 21-13/16 19-13/16 25-15/16 23-7/8 13-3/4 28-1/8 10-11/16 20-1/4 11-11/16 3-13/16 23-13/16 21-13/16 Small...
  • Page 8 Table 7—Calculation of Indoor Piston No. OUTDOOR UNIT ABOVE INDOOR PISTON CHANGE 0-25 26-50 51-75 76-100 101-125 126-150 OUTDOOR UNIT BELOW INDOOR PISTON CHANGE 0-25 26-50 Table 8—Calculation of Outdoor Piston No. OUTDOOR UNIT ABOVE INDOOR PISTON CHANGE 0-50 51-75 76-100 101-125 126-150...

  • Page 9: Unit Identification

    175' MAX. GROUND LEVEL BASEMENT A90074 Fig. 4—Application with Air Conditioner Installed in a Horizontal Configuration 175' MAX. GROUND LEVEL BASEMENT A90075 Fig. 5—Application with Heat Pump Installed in a Horizontal Configuration UNIT IDENTIFICATION Positions 6, 7, and 8—Nominal Cooling Capacity (in thousands Btuh) Step 1—Product Number Stamped on Unit-Rating Plate Example: 036 = 36,000 Btuh or 3–ton capacity.

  • Page 10: Serial Number Identification

    TRAP 50' MAX. HEAT PUMP ONLY GROUND LEVEL A90076 Fig. 6—Application with Air Conditioner or Heat Pump Installed with Indoor Unit Above Outdoor Unit Example: A–Indianapolis 3—230 or 208–230 or 208/230, 1 Phase, 60 Hertz E–Collierville 5—230 or 208–230 or 208/230, 3 Phase, 60 Hertz Positions 6 through 10—Serial Number 6—460, 3 Phase, 60 Hertz 7—220/240, 1 Phase, 50 Hertz...

  • Page 11: Information Plate-Weathermaker

    HEAT PUMP ONLY 150' MAX. A90077 Fig. 7—Application with Air Conditioner or Heat Pump Installed Above Indoor Unit Step 3—Information Plate—WeatherMaker™ 5. Disconnect fan motor wires, cut any wire ties, and move wires out of control box and through tube clamp on back of control The information plate is secured to the front of the control box and box.

  • Page 12: Electrical

    Aluminum wire may be used in the branch circuit (such as the circuit between the main and unit disconnect), but only copper wire may be used between the unit disconnect and the unit on Carrier systems. A88411 Whenever aluminum wire is used in the branch-circuit wiring with Fig.

  • Page 13: Contactors

    SE FL JO SD J SE FL JO SE FL SD J JO SD J SE FL JO SE FL SD J JO SD J SE SE FL FL JO JO SD SD J J SE SE FL FL JO JO SD SE FL SE FL...

  • Page 14: Capacitors

    Step 3—Capacitors 3. Remove any capacitor that shows signs of bulging, dents, or leaking. Do not apply power to a defective capacitor as it may explode. START CAPACITORS AND PTC DEVICES Capacitors can store electrical energy when power is off. Electrical shock can result if you touch the capacitor termi- Sometimes under adverse conditions, a standard run capacitor in a nals and discharge the stored energy.
  • Page 15 5. Try restarting compressor without boost capacitor. If after 2 5. Discharge start capacitor by using a pair of insulated, needle- attempts compressor does not start, remove thermistor. Add an nose pliers and shorting a 15,000–ohm, 2–watt resistor across accessory start-capacitor relay package. terminals.

  • Page 16: Cycle Protector

    HN67ZA002 A91438 HN67ZA008 A94005 T3 BLK T1 YEL T2 VIO T3 BLK HN67PA025 HN67ZA003 A91440 A91439 Fig. 15—Cycle-Protector Device across them. Both PTC device and capacitor-relay start system are Step 5—Crankcase Heater standard equipment on some of these units. They are also available Crankcase heater is a device for keeping compressor oil warm.

  • Page 17: Time-Delay Relay

    OPERATING OPERATING 5 MIN 5 MIN TIME TIME BLK DENOTES CLOSED CONTACTS BLK DENOTES CLOSED CONTACTS HN67ZA002 HN67PA025, HN67ZA003, HN67ZA008 A91436 A91437 Fig. 16—Cycle-Protector Sequence CUT YELLOW WIRE BETWEEN CONTACTOR AND LOW-PRESSURE SWITCH SAFETY CONTROL TERMINAL TERMINAL BOARD BOARD CONNECTION CONNECTION LOGIC A88415...

  • Page 18: Pressure Switches

    Step 7—Pressure Switches Step 9—Defrost-Control Board Solid-state defrost boards used on heat pumps replace electrome- Pressure switches are protective devices wired into control circuit chanical timer and defrost relay found on older defrost systems. (low voltage). They shut off compressor if abnormally high or low The defrost-control board can be field-set to check need for defrost pressures are present in the refrigeration circuit.
  • Page 19 OF2 OF1 TI DFT TEST 30 50 90 30 50 CES0110063, CES0130024 HK32FA003/HK32FA006 A91442 A88402 Fig. 19—Jumper DFT and R Terminals have closed, energizing supplemental heat (W2) and reversing 7. Unit changes over to defrost within 90 sec (depending on valve solenoid (O).
  • Page 20 TEST 30 50 90 TI DFT HK32FA003/HK32FA006 CES0110063, CES0130024 A88404 A91444 Fig. 20—Inserting Jumper Wire OF2 OF1 TI DFT TEST 30 50 90 30 50 HK32FA003/HK32FA006 CES0110063, A88403 CES0130024 A91443 Fig. 21—Checking Between C and W2 across defrost thermostat leads using ohmmeter. Resistance of zero indicates defrost thermostat is closed and operating Exercise extreme caution when shorting speed-up pins.
  • Page 21 Table 11—Defrost Control Speed-Up Timing Sequence for CES0110063/CES0130024 SPEED-UP PARAMETER MINIMUM MAXIMUM (NOMINAL) 30-minute cycle 7 sec 50-minute cycle 12 sec 90-minute cycle 21 sec 10-minute cycle 2 sec 5 minutes 1 sec 12. After a few minutes in defrost (cooling) operation, liquid line new control, you must have replacement-defrost thermostat and should be warm enough to have caused defrost-thermostat harness kit.

  • Page 22: Fan Motors

    CESO130076–00 Speedup Quiet Defrost interval Pins Shift DIP switches A99442 Fig. 22—Defrost Control This control has the option of shutting down the compressor for 30 FEEDER TUBE seconds while going into and out of defrost modes. This is STUB TUBE accomplished by turning DIP switch 3 to the ON position.

  • Page 23: Service Alarm Control Board

    TOP COVER 3 IN. SMALL & MEDIUM BASE UNITS 4 IN. LARGE BASE UNIT FROM DISCHARGE LOUVER TO TOP OF FAN BLADE BASKET TOP A91428 FAN BLADE ORIFICE STAR BURST TOP A88347 Fig. 24—Fan Position For suspected electrical failures, check for loose or faulty electrical Table 13—Fan Position connections or defective fan-motor capacitor.

  • Page 24: Outdoor Thermostat(S)

    compressor terminals, and the mating female terminals are com- pletely encapsulated in the plug. Therefore, the terminals are If service alarm needs replacing, shut off all power to unit isolated from any moisture so corrosion and resultant pitted or before attempting removal. Electrical shock can cause per- discolored terminals are reduced.

  • Page 25: Reciprocating Compressor

    FIELD LINE VOLTAGE SUPPLY WIRE CYCLE PROTECTOR SERVICE ALARM HIGH AND/OR LOW PRESSURE AND/OR DISCHARGE TEMPERATURE SWITCH (IF USED) A88339 THERMOSTAT INDOOR OUTDOOR SUBBASE UNIT UNIT COMMON POTENTIAL TERMINAL TERMINAL FACTORY WIRING (FIELD CONNECTED) BOARD BOARD FIELD-SUPPLIED WIRING CONTACTOR A88339 Fig.

  • Page 26: Electrical Failures

    BRISTOL CARLYLE LEAD 3 COPELAND BLUE Use safety glasses and gloves when handling refrigerants. Sometimes a leak is detected at weld seam around girth of compressor or a fitting that joins compressor shell. Many of these leaks can be repaired and the compressor saved if correct proce- dure is followed.

  • Page 27: System Cleanup After Burnout

    (EXAMPLE) TO DETERMINE INTERNAL CONNECTIONS OF SINGLE- PHASE MOTORS (C,S,R) EXCEPT SHADED-POLE DEDUCTION: POWER OFF! (GREATEST RESISTANCE) RUN WINDING (R) 5.8 (OHM) START WINDING (S) OHMMETER (SMALLEST RESISTANCE) IS COMMON (C) 0-10 SCALE BY ELIMINATION (REMAINING RESISTANCE) IS COMMON, THEREFORE, START WINDING (S) IS RUN WINDING (R) A88344...

  • Page 28: Compressor Removal And Replacement

    acids, contaminate system. If burnout is severe enough, system must be cleaned before replacement compressor is installed. The 2 types of motor burnout are classified as mild or severe. Scroll Gas Flow In mild burnout, there is little or no detectable odor. Compressor oil is clear or slightly discolored.

  • Page 29: Discharge Solenoid Valve

    PLASTIC CAP Table 14—Compressor Oil Recharge RECHARGE COMPRESSOR MODEL OIL TYPE (FL. OZ.) Carlyle/Scroll ”J” Type Suniso 3GS BLUE SEALANT SC, SRD450AC PRONG Zerol 150 w/3 percent SRH482, SRY482 Syn-O-Ad SRH602, SRY602 Copeland CRG3, CRH3, CRJ3, CRK3, CRL3 CRN5, CRP5, CRT5, CTH1, CTL1 CRC4, CRZ4 CR16K6 Through CR42K6 GROMMET...
  • Page 30 A00010 Fig. 31—CES0130075 3–Phase Monitor Board COMP CONT EQUIP CONT LOGIC CESO130075 CONT CONT *LPS *HPS LOGIC *LLS INDOOR EXTERNAL POWER SUPPLY 24 V THERMOSTAT A00011 Fig. 32—CESO130075 3–Phase Monitor Wiring Diagram...

  • Page 31: Remove Fan Motor

    with an isolated compressor compartment, greatly reduces the continuous through coil sections. Dirt and debris may pass through overall sound level of the unit. The unit utilizes front and back first section, become trapped between the rows of fins, and restrict seating valves.
  • Page 32 occur. When high-speed, heat-pump heating is required, the control provides a Y2 (24vac) signal back to the thermostat to LM1 LM2 DFT1 DFT2 T1 S1 PW2 PW1 energize high-speed-indicator LED. Table 15—Ambient Temperature for High- and Low-Speed Operation AMBIENT TEMPERATURE (°F) UNIT FURN INT SIZE...
  • Page 33 Table 16—Function Light Code and Display Location CODE T’STAT UNIT DEFINITION POSSIBLE CAUSE Constant flash No demand — — No pause Stand by 1 flash — Low-speed operation — w/pause 2 flashes — High-speed operation — w/pause 3 flashes Ambient thermistor failure —...

  • Page 34: Factory Defaults

    balance-point POT. (See Fig. 36.) Temperatures that may be The outdoor unit is equipped with high- and low-pressure selected are 10°, 15°, 20°, 25°, 30°, 35°, 40°, and 45°F. The POT switches, wired in series. If a pressure switch opens, the control is factory-set at 45°F.
  • Page 35 Table 18—Factory Defaults FAILED COMPONENT FUNCTION DEFAULT Crankcase Heater Energized during any off cycle Second-Stage Latching Does not function Balance point does not function, but Furnace Interface interface still energizes furnace and locks out heat pump with a call for W2 Ambient Thermistor Unit only runs in high- Heating Switchover Speed Point...

  • Page 36: Led Function/Malfunction Lights

    4. Use an ohmmeter on 0-1000 ohm scale to check resistance. THERMISTOR CURVE (See Fig. 40, 42, and 43 and Table 19.) Because winding resistances are usually less than 10 ohm, each reading will appear to be approximately zero ohm. If during any check the resistance remains at 1000 ohm, an open or break exists, and the motor or compressor should be replaced.
  • Page 37 SCHEMATIC DIAGRAM (LADDER FORM) COMP MAIN HIGH MAIN START START EQUIP A91446 Fig. 42—Low-Speed Windings SCHEMATIC DIAGRAM (LADDER FORM) COMP MAIN HIGH MAIN START START EQUIP A91445 Fig. 43—High-Speed Windings...

  • Page 38: Refrigeration System

    (less expensive than are good, replace the control board. refrigerant). Nitrogen also leaks faster than R-22 and is not If voltage is present, reconnect the motor and check again. Shut absorbed by refrigeration oil. Nitrogen cannot, however, be down the unit to reconnect the motor and restart the unit to detected by a leak detector.

  • Page 39: Brazing

    This section of brazing is not intended to teach a technician how to COOLING CYCLE braze. There are books and classes which teach and refine brazing REVERSING VALVE techniques. The basic points above are listed only as a reminder. (ENERGIZED) OUTDOOR FAN INDOOR INDOOR COIL...

  • Page 40: Accurater™ (Bypass-Type) Heat Pumps Only

    SERVICE PORT FIELD W/SCHRADER STEM SIDE CORE STEM SERVICE PORT W/SCHRADER CORE FIELD SIDE SEAT SEAT BAR STOCK FRONT SEATING VALVE FORGED FRONT SEATING VALVE A91447 A91448 Fig. 46—Service Valves pressurized. To pressurize the service port, this valve must be The service valve cannot be field repaired;...

  • Page 41: Reversing Valve

    PISTON BODY FEEDER PISTON TUBES (ORIENT AS SHOWN) STRAINER BRASS PISTON HEX NUT PISTON RETAINER FLARE ADAPTER TEFLON PISTON BRASS SEAL RETAINER BODY INTERNAL STRAINER PRODUCTION A91138 EXCEPT 1992 A94004 Fig. 47—AccuRater™ Components WEATHERMAKER™ PRODUCTS EXCEPT 1992 PRODUC- With unit operating, other items can be checked, such as frost or TION condensate water on refrigerant lines.

  • Page 42: Thermostatic-Expansion Valves (Txv)

    See Table 21 for TXV superheat settings. These settings are Mode, Solenoid Energized) factory-set and are not field adjustable. Table 21 settings are for Carrier-approved accessories and factory-installed TXVs only. The types of TXVs used in condensing-unit and heat-pump systems are as follows:...

  • Page 43: Thermostatic-Expansion Valve (Bi-Flow Txv)

    Cut in convenient location for easy reassembly the diaphragm. with copper-slip couplings. 3. The needle valve on the pin carrier is spring-loaded, which 8. Lift coil vertically from basepan. Place aside carefully. also exerts pressure on the underside of the diaphragm via the 9.
  • Page 44 CAPILLARY TUBE DIAPHRAGM BYPASS TXV PUSHRODS FEEDER TUBES INLET COIL OUTLET NEEDLE VALVE SPRING DISTRIBUTOR BULB CHECK VALVE (CLOSED) EXTERNAL EQUALIZER TUBE BYPASS TUBE A88406 Fig. 51—TXV in Cooling Mode CAPILLARY TUBE DIAPHRAGM BYPASS TXV PUSHRODS FEEDER TUBES INLET COIL OUTLET NEEDLE VALVE...

  • Page 45: Contaminant Removal

    NOTE: Coil may be removed for access to accumulator. Refer to 4. Close the service valve. appropriate sections of service manual for instructions. 5. Allow system to stand for 1 hr, during which time the dry refrigerant will be able to diffuse throughout the system, absorbing moisture.

  • Page 46: Care And Maintenance

    Table 22—Superheat Charging Table INDOOR COIL ENTERING AIR TEMP (°F WET BULB) OUTDOOR TEMP (°F) — — — — — — — — — — — — — — — — — — — — — — — — — —...
  • Page 47 Table 23—Required Vapor Temperature (°F) VAPOR PRESSURE AT SERVICE PORT (PSIG) SUPERHEAT TEMP (°F) 61.5 64.2 67.1 70.0 73.0 76.0 79.2 82.4 85.7 Table 24—Subcooling at Liquid-Service Valve for Units Produced Through December, 1992 WEATHERMAKER™ AIR CONDITIONERS 38TD MODEL 38TG 38TH 38TK 38TKB...
  • Page 48 CUBE UNIT CUBE UNIT HORIZONTAL AIR CONDITIONERS HEAT PUMPS AIR CONDITIONERS MODEL 38CK 38YC 38GN 38GNA 38HDA 38QRA SERIES — — — — — — — — — — — — — — — — — — — — — —...
  • Page 49 2. Check to be sure caps are installed on service valves and that mounting rack are available as accessories and can be used to they are tight. elevate the unit. 3. Check to be sure tools, loose parts, and debris are removed 3.

  • Page 50: Troubleshooting Chart

    AIR CONDITIONER TROUBLESHOOTING CHART NO COOLING OR INSUFFICIENT COOLING COMPRESSOR COMPRESSOR RUNS BUT RUNS BUT COMPRESSOR CYCLES ON INSUFFICIENT WILL NOT RUN INTERNAL COOLING OVERLOAD OUTDOOR FAN HIGH SUCTION HIGH SUCTION CONTACTOR CONTACTOR STOPPED OR LOOSE LEAD LOW SUCTION LOW HEAD OPEN CLOSED CYCLING ON...
  • Page 51 HEAT PUMP TROUBLESHOOTING–COOLING CYCLE NO COOLING OR INSUFFICIENT COOLING COMPRESSOR COMPRESSOR RUNS BUT RUNS BUT COMPRESSOR CYCLES ON INSUFFICIENT WILL NOT RUN INTERNAL COOLING OVERLOAD OUTDOOR FAN HIGH SUCTION HIGH SUCTION STOPPED OR CONTACTOR CONTACTOR LOOSE LEAD LOW SUCTION LOW HEAD CYCLING ON OPEN CLOSED...
  • Page 52 A90206 Fig. 56—Heat-Pump Troubleshooting Chart — Heating Cycle Copyright 2000 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 3810sm Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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