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CONTENTS
46) Inspect Refrigerant Low Pressure Sensor................................................................. 224
47) Inspect Sub Heat Exchanger Liquid Flow Control Valve...........................................225
48) Inspect Outdoor Heat Exchanger Liquid Flow Control Valve ....................................226
49) Inspect Reversing Valve ...........................................................................................227
50) Check for Readings of the Compressor Discharge Pipe Temperature Sensor.........227
51) Check for Readings of the Outside Air Temperature Sensor....................................228
52) Check for Readings of the Engine Exhaust Air Temperature Sensor .......................228
53) Check for Readings of the Outdoor Temperature Sensors.......................................229
54) Inspect Subcooling Valve.......................................................................................... 230
55) Check Operation Condition .......................................................................................231
56) Check for Readings of the Indoor Temperature Sensors.......................................... 231
57) Check Indoor Air Intake Status .................................................................................231
58) Check Drain Water....................................................................................................232
59) Inspect Drain Pump...................................................................................................232
60) Inspect Drain Float Switch ........................................................................................232
61) Inspect Compressor Clutch....................................................................................... 232
5. Board Maintenance Functions............................................................. 233
1) Outline of the Maintenance Function ........................................................................233
2) Code List for Each Mode ..........................................................................................235
3) Running Hours Display Mode ................................................................................... 239
4) Monitor Mode ............................................................................................................245
5) Command Mode .......................................................................................................246
6) Check Mode..............................................................................................................247
7) Operational Procedure / Display Contents................................................................248
6. Protection Devices............................................................................... 299
7. Standard Operation Data..................................................................... 305
8. Wiring Diagram of the Outdoor Unit .................................................... 306
TECHNICAL DATA FOR REPAIR
1. Engine System .................................................................................... 310
2. Refrigerant System.............................................................................. 312
3. Engine Coolant System ....................................................................... 314
4. Thermistor Characteristics................................................................... 315
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