Carrier Infinity 25VNA8 User Manual

Service Manual
25VNA8 Infinityr 18V S Variable Spee d Heat Pump
24VNA9 Infinityr 19VS Variable Speed Air Conditioner
with Puronr Refrigerant
TABLE OF CONTENTS
PAGE
UNIT IDENTIFICATION 2.................................................................................
REFRIGERANT PIPING LENGTH LIMITATIONS 3...........................................................
LONG LINE APPLICATIONS 3.............................................................................
SAFETY CONSIDERATIONS 4.............................................................................
GENERAL INFORMATION 4..............................................................................
ELECTRICAL 5..........................................................................................
MAJOR COMPONENTS 5--7...............................................................................
AOC Board 5..........................................................................................
Inverter 5..............................................................................................
Variable Speed Compressor 5..............................................................................
Electronic Expansion Valve (EXP) 6.........................................................................
Outdoor Fan Motor 6.....................................................................................
Pressure Transducer (SPT) 6...............................................................................
Pressure Equalizer Valve (PEV) 6...........................................................................
Outdoor Coil Thermistor (OCT) 6...........................................................................
Suction Thermistor (OST) 7...............................................................................
Discharge Thermistor (ODT) 7.............................................................................
Crankcase Heater 7......................................................................................
Time--Delays 7.........................................................................................
COMMUNICATION AND STATUS FUNCTION LIGHTS 7.....................................................
CHECK CHARGE 9.......................................................................................
TROUBLESHOOTING 9--13................................................................................
Service Tool 14--34......................................................................................
System Communication Failure 14..........................................................................
Model Plug 14..........................................................................................
Status Codes 14.........................................................................................
Variable Speed Compressor Winding Resistance 15.............................................................
Fan Motor 16...........................................................................................
Brown Out Protection 16..................................................................................
230v Line (Power Disconnect) Detection 16...................................................................
Pressure Switch Protection 16..............................................................................
Suction Pressure Transducer (SPT) 16........................................................................
Temperature Thermistors 17...............................................................................
Fault Code Action Table 19................................................................................
Variable Speed Drive LED Location and Description 28..........................................................
Compressor Power Harness Assembly Replacement 29..........................................................
Inverter Assembly with Shield Gasket Installation 31............................................................
Compressor Replacement 34...............................................................................
WIRING DIAGRAMS 37--38.................................................................................
REFRIGERATION SYSTEM 39--43..........................................................................
Refrigerant 39..........................................................................................
Compressor Oil 39.......................................................................................
Servicing Systems on Roofs With Synthetic Materials 39.........................................................
Brazing 39.............................................................................................
Service Valves and Pump down 39..........................................................................
Liquid Line Filter Drier 42................................................................................
Suction Line Filter Drier 42................................................................................
Thermostatic Expansion Valve (TXV) 42.....................................................................
Accumulator 43.........................................................................................
REFRIGERATION S YSTEM REPAIR 43.....................................................................

Carrier Infinity 25VNA8 Specifications

General

Brand	Carrier
Model	Infinity 25VNA8
Category	Heat Pump
Language	English