Carrier Infinity 25VNA8 Service Manual
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Carrier Infinity 25VNA8 Service Manual

Variable speed heat pump
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25VNA8 Infinityr 18VS Variable Speed Heat Pump
24VNA9 Infinityr 19VS Variable Speed Air Conditioner
with Puronr Refrigerant
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Service Manual

TABLE OF CONTENTS

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Summary of Contents for Carrier Infinity 25VNA8

  • Page 1: Table Of Contents

    25VNA8 Infinityr 18VS Variable Speed Heat Pump 24VNA9 Infinityr 19VS Variable Speed Air Conditioner with Puronr Refrigerant Service Manual TABLE OF CONTENTS PAGE UNIT IDENTIFICATION ................. REFRIGERANT PIPING LENGTH LIMITATIONS .

  • Page 2: Unit Identification

    UNIT IDENTIFICATION The unit is identified using a 16 digit model number structure. It is recommended providing the complete 16 digit model number when ordering replacement parts to insure receiving the correct parts. MODEL NUMBER NOMENCLATURE - - HEAT PUMP Product Series Heat Pump SEER...

  • Page 3: Refrigerant Piping Length Limitations

    REFRIGERANT PIPING LENGTH LIMITATIONS Maximum Line Lengths: The maximum allowable total equivalent length varies depending on the vertical separation. See the tables below for allowable lengths depending on whether the outdoor unit is on the same level, above or below the outdoor unit. Maximum Line Lengths MAXIMUM ACTUAL LENGTH MAXIMUM EQUIVALENT LENGTH{...

  • Page 4: Safety Considerations

    WARNING speed technology. The heart of the system is the Toshiba Carrier variable speed rotary compressor powered through the use of the variable speed drive ELECTRICAL SHOCK HAZARD (VSD) inverter control. Through the use of Puron refrigerant,...

  • Page 5: Electrical

    ELECTRICAL MAJOR COMPONENTS Application Operational Control Board (AOC) WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Exercise extreme caution when working on any electrical components. Shut off all power to system prior to troubleshooting.

  • Page 6: Electronic Expansion Valve (Exp)

    CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage and/or improper operation. Do not attempt to apply line voltage directly to the compressor. This will destroy the compressor. Electronic Expansion Valve (EXV) This unit uses an electronic expansion valve for refrigerant metering in the heating mode.

  • Page 7: Suction Thermistor (Ost)

    Suction Thermistor (OST) Crankcase Heater Operation Suction Thermistor is used for assisting in EXV control and must This unit has an internal crankcase heater that will be energized be secured on the suction tube and aligned longitudinally to the during the off cycle and is intelligently demanded by the system to vertical surface of the tube axis (see Fig.

  • Page 8: Communication And Status Function Lights

    COMMUNICATION AND STATUS FUNCTION LIGHTS Infinity Touch Control, Green Communications (COMM) When defrost time <5 minutes, the next defrost interval=90 minutes. (outdoor temperature above 37_F) Light When defrost time 5- -7 minutes, the next defrost interval=60 A green LED (COMM light) on the outdoor board (see Fig. 7 and minutes.

  • Page 9: Check Charge

    CHECK CHARGE Charge in CHARGING mode (communicating only) Unit is factory charged for 15ft (4.57 m) of lineset. If any refrigerant charge adjustment is required due to the user inputted line set length, the UI will calculate and display the target subcooling and the amount of additional charge to be added.
  • Page 10 Table 1—Required Charge Adjustment for Indoor Coil Model - - HP Outdoor Model Size Furnace or Fan Coil Model Number CNPV*18** CAP**18** CNP**24 CNPV*19** CAP**24 CSPH*24 CSPH*30** F(E,V)4(A,B,C)NF002 +0.19 CAP**30 CNP**30 CNP**36 F(E,V)4(A,B,C)N(B,F)003 CAP**36 CNP**42 +.50 +.75 CAP**42 +.50 +.75 CSPH*36 +.75 CSPH*42**...
  • Page 11 Fig. 12 – Charging in Cooling Mode 25VNA813 Fig. 16 – Charging in Cooling Mode 25VNA837 Fig. 17 – Charging in Cooling Mode 25VNA848 Fig. 13 – Charging in Cooling Mode 25VNA824 Fig. 18 – Charging in Cooling Mode 25VNA860 Fig.
  • Page 12 Fig. 19 – Charging in Cooling Mode 24VNA913 Fig. 23 – Charging in Cooling Mode 24VNA937 Fig. 20 – Charging in Cooling Mode 24VNA924B Fig. 24 – Charging in Cooling Mode 24VNA948 Fig. 21 – Charging in Cooling Mode 24VNA925 Fig.
  • Page 13 Heating Check Chart Procedure (See Fig.27 - - 33) (Communicating / Non- - communicating Systems) In heating mode, the required charging method is by weigh- -in. On new installations or complete recharge, refer to the unit 0 and indoor fan coil / furnace coil per Table 1 for additional charge needed.

  • Page 14: Troubleshooting

    TROUBLESHOOTING Table 3—Factory Supplied Model Plug Information Service Tool MODEL PLUG 25VNA8 Pins 1--- 4 Pins 2--- 3 NUMBER HK70EZ029 220K HK70EZ009 5.1K HK70EZ001 5.1K HK70EZ002 5.1K HK70EZ026 120K HK70EZ003 5.1K HK70EZ004 5.1K MODEL PLUG 24VNA9 Pins 1--- 4 Pins 2--- 3 NUMBER HK70EZ028 180K...

  • Page 15: Variable Speed Compressor Winding Resistance

    Utility Relay A13414 Fig. 35 – Variable Speed Control Board with optional Utility Relay Variable Speed Compressor Winding Resistance Table 4—Variable Speed Compressor Resistance (winding resistance at 70_F 20_F) This compressor operates with 3- -phase variable frequency PWM MODEL 25VNA8 / 24VNA9 (OHMs) variable voltage.

  • Page 16: Fan Motor

    Fan Motor Low Pressure Protection The outdoor unit is equipped with low pressure transducer. If the If verification of proper operation is required for the fan motor control senses a low pressure per the table below, it will respond as used in this unit, follow these steps: follows: 1.

  • Page 17: Temperature Thermistors

    Temperature Thermistors Thermistor Sensor Comparison Thermistors are electronic devices which sense temperature. As the The control continuously monitors and compares the outdoor air temperature increases, the resistance decreases. 10Kohm temperature sensor and outdoor coil temperature sensor to ensure thermistors are used to sense outdoor air temperature (OAT), coil proper operating conditions.
  • Page 18 Fig. 39 – Fault Code Label...

  • Page 19: Fault Code Action Table

    Table 6—Fault Code Actions Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time ON, no flash Standby Normal Operation 1, pause Variable Capacity for communicating system 1 (2 sec ON), Speed Limiting for longer pause Variable Capacity (Range communicating sys- (1 second Cutback)
  • Page 20 Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time Sensor Harness not connected to AOC Ensure plug is connected to AOC control control Check harness for continuity; see resis- Broken or loose har- tance chart to check resistance at given ness wire OUTDOOR AIR TEMP SEN- temperature...
  • Page 21 Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time DISCHARGE TEMP OUT OF RANGE EVENT (Stage down for each oc- currence, elevates to fault code 74 after 5 occurrence. Reduced capacity is 15 Min- Local cleared if demand cycle is Both Refer to fault code 74 utes...
  • Page 22 Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time High Load condi- Cool Over charge: Check system charge tions Low Charge or Loss Check charge in heating mode per heating of Charge at low am- check charge chart. If pressures do not Heat bient heating condi- match then pull out charge, weigh in using...
  • Page 23 Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time COMPRESSOR/INVERTER Compressor fails to System will try to self ---mitigate with repeat- FAULT start ed start attempts Local 6 Minutes Both (Elevates to fault code 88 Refer to fault code 88 after 5 occurrences) Check system subcooling to determine Undercharged Sys-...
  • Page 24 Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time Check Outdoor Coil for clogging (ice or debris) and clean or de ---ice if necessary; Outdoor Airflow too Cool Troubleshoot Outdoor fan motor and low or off make sure it is working; follow Outdoor Airflow troubleshooting instruction Cool Overcharged System...
  • Page 25 Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time Blocked Inverter Check Inverter fins for debris and clean if Heat Exchanger necessary (fins) Check Condenser (IDU in heating, ODU in Condenser Airflow cooling) for clogging (ice or debris) and too low or off clean if necessary;...
  • Page 26 Reset Flash Code Type Amber LED Description Mode Possible Causes Actions Time Check system subcooling to determine charge status, if high remove charge using Cool Overcharged System Charging Mode (follow proper charging procedures) Check charge in heating mode per heating check charge chart.
  • Page 27 Variable Speed Drive LED Location and Description (Sizes 13 and 24B) LED 200 LED 207 STATUS COMM MOC LED Description (Sizes 13 and 24B) Reference Color Status Condition Description Steady Normal Indicates MOC powered where DC bus at 40volts or higher LED200 Abnormal No power, capacitor voltage drained...

  • Page 28: Variable Speed Drive Led Location And Description

    Variable Speed Drive LED Location and Description (Sizes 25, 36, 37, 48, 49 and 60) MOC LED Description (Sizes 25, 36, 37, 48, 49 AND 60) Reference Color Status Description Steady On MOC powered where DC bus is 40volts or greater No power, capacitor voltage drained Steady On DCF and board DC high voltage and discharge circuit powered on...

  • Page 29: Compressor Power Harness Assembly Replacement

    COMPRESSOR POWER HARNESS ASSEMBLY REPLACEMENT (Reference RCD Instruction # 99TA516170) The following is a recommended procedure for compressor power harness replacement. Always refer to the unit product installation, start- -up & service instructions for detailed procedures. WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death.
  • Page 30 9. With using a slot screwdriver, lift up the on the side tab to 12. Remove cover, unplug old harness, plug in new harness, pry the cover off from the RTV. Be sure not to break the tab. verify bushing is reinstalled and plug leads leave the terminal box through the bushing;...

  • Page 31: Inverter Assembly With Shield Gasket Installation

    INVERTER ASSEMBLY w SHIELD GASKET REMOVAL AND INSTALLATION (Reference RCD Instruction # 99TA512018) Also see figures 41 through 42 6. After verifying the voltage has dissipated to zero, WARNING disconnect wiring from the inverter. 7. Disconnect three compressor power wires. Note wire color ELECTRICAL SHOCK HAZARD order –...
  • Page 32 Fan Motor Harness Plug Compressor Power Harness Wires Yel, Red, Fig. 40 – Compressor and Fan Harness (Unit sizes 13 and 24B) Fig. 41 – Compressor and Fan Harness (Unit sizes 25, 36, 37, 48, 49 and 60)
  • Page 33 Reversing Valve PLUG EXV PLUG Discharge Inverter Ground Thermistor Wire, GRN / YEL PLUG Stripes High Pressure Inverter Input Switch PLUG Power Wires BLK and YEL OAT/OCT PLUG Suction Suction Suction Thermistor Thermis Pressure PLUG PLUG Transducer ABCD PLUG PLUG Fig.

  • Page 34: Compressor Replacement

    COMPRESSOR REPLACEMENT (Reference RCD Instruction # 99TA516169) The following is a recommended procedure for compressor CAUTION replacement. Always refer to the unit product installation, start- -up & service instructions for detailed procedures. UNIT DAMAGE HAZARD WARNING Failure to follow this caution may result in equipment damage or improper operation.
  • Page 35 7. Cut the wire tires securing the compressor power harness to 10. Remove compressor mounting hardware. the control box. Remove compressor power harness (from 11. Cut both suction and discharge lines with tubing cutter. Do control box). Replace wire tie with one supplied; do not not use brazing torch for compressor removal as oil vapor fasten at this time.
  • Page 36 Severe Burnout 20. Reinstall service panel. 21. Route compressor harness choke to left hand side of the top Perform steps 1 – 22 as specified in the Replacement Procedure for of control box and push in wire tie. Pull wires tight as they Mechanical Failure and then perform steps as follows: enter control box and tighten second wire tie.

  • Page 37: Wiring Diagrams

    WIRING DIAGRAMS - - 24VNA9 Fig. 44 – 24VNA9 WIRING DIAGRAM - - Sizes 13 and 24B CONNECTION DIAGRAM UNIT OPERATION This control board contains a 3.5 minute short cycle protector. A 3.5 minute delay will occur between COMP Compressor off/on cycles. To bypass delay, short forced defrost pins for 1 second then release. However, there is an additional 2.5 minutes delay upon expiration of the 3.5 minute short cycle delay to ensure the high and low side pressures are equalized.
  • Page 38 WIRING DIAGRAMS - - 25VNA8 Fig. 46 – 25VNA8 WIRING DIAGRAM - - Sizes 13 and 24B Fig. 47 – 25VNA8 WIRING DIAGRAM - - Sizes 25, 36, 37, 48, and 60...

  • Page 39: Refrigeration System

    REFRIGERATION SYSTEM Refrigerant 4. Perform required service. 5. Remove and dispose of any oil contaminated material per WARNING local codes. Brazing UNIT OPERATION AND SAFETY HAZARD This section on brazing is not intended to teach a technician how to braze. There are books and classes which teach and refine brazing Failure to follow this warning could result in personal injury techniques.
  • Page 40 Pump Down - - Infinity Communicating - - 24VNA9 The service valve- -stem cap is tightened to 20  2 ft/lb torque and the service- -port caps to 9  2 ft/lb torque. The seating surface of Because this system is inverter controlled, compressor, suction the valve stem has a knife- -set edge against which the caps are pressure transducer, conventional procedure cannot be used to tightened to attain a metal- -to- -metal seal.
  • Page 41 Evacuation and recovery of refrigerant from 24VNA9 3. Close the liquid service valve. 4. The unit will continue to run until high or low pressure 1. Connect gauges to 24VNA9 liquid and vapor service valve switches open. Close vapor service valve once compressor ports to monitor operating pressures during and at comple- shuts down.

  • Page 42: Liquid Line Filter Drier

    CAUTION FROM INDOOR COIL VIA SERVICE VALVE ON TO OUTDOOR UNIT DAMAGE HAZARD OUTDOOR COIL COIL Failure to follow this caution may result in equipment damage ACCUMULATOR or improper operation. To avoid filter drier damage while brazing, filter drier must be TP- -4 TP- -3 TP- -2...

  • Page 43: Accumulator

    Accumulator WARNING The accumulator is specifically designed to operate with Puronr or R22 respectfully; use only factory- -authorized components. ELECTRICAL SHOCK HAZARD Under some light load conditions on indoor coils, liquid refrigerant is present in suction gas returning to compressor. The accumulator Failure to follow this warning could result in personal stores liquid and allows it to boil off into a vapor so it can be safely injury or death.
  • Page 44 There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label. Catalog No. 25VNA8---24VNA9---4SM Copyright 2017 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Edition Date: 01/17 Replaces: 25VNA8--- 24VNA9--- 3SM...

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Infinity 24vna9

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