Komatsu PC88MR-10 Shop Manual page 14

00 Index and foreword
Index
Testing with self-diagnosis function ...................................................................................... 80-39
Testing vent (mode) changeover.......................................................................................... 80-42
Testing FRESH/RECIRC air changeover.............................................................................. 80-43
Testing sunlight sensor ....................................................................................................... 80-44
Testing (dual) pressure switch for refrigerant......................................................................... 80-45
Testing relays .................................................................................................................... 80-47
Troubleshooting chart 1 ...................................................................................................... 80-48
Troubleshooting chart 2 ...................................................................................................... 80-49
Information in troubleshooting table ..................................................................................... 80-52
Failure code list related to air conditioner.............................................................................. 80-53
Failure code [879AKA] A/C Recirc Air Temp Sens Open Circuit.............................................. 80-54
Failure code [879AKB] A/C Recirc Air Temp Sens Short ........................................................ 80-55
Failure code [879BKA] A/C Fresh Air Temp Sens Open Circuit............................................... 80-56
Failure code [879BKB] A/C Fresh Air Temp Sens Short Circuit ............................................... 80-58
Failure code [879CKA] Ventilating Sensor Open Circuit ......................................................... 80-60
Failure code [879CKB] Ventilating Sensor Short Circuit ......................................................... 80-61
Failure code [879DKZ] Sunlight Sensor Open or Short Circuit ................................................ 80-62
Failure code [879EMC] Ventilation Damper Malfunction ........................................................ 80-64
Failure code [879FMC] Air Mix Damper Malfunction .............................................................. 80-65
Failure code [879GKX] Refrigerant Press Input Sig Out of Range........................................... 80-66
A-1 Troubleshooting for power supply system (Air conditioner does not operate) ..................... 80-67
A-2 Troubleshooting for compressor and refrigerant system (Air is not cooled) ........................ 80-69
A-3 Troubleshooting for blower motor system (No air comes out or air flow is
abnormal) ............................................................................................................ 80-72
A-4 Troubleshooting for FRESH/RECIRC air changeover ...................................................... 80-74
Troubleshooting with gauge pressure................................................................................... 80-76
Connection of service tool................................................................................................... 80-79
Precautions for disconnecting and connecting refrigerant piping............................................. 80-81
Handling of compressor oil.................................................................................................. 80-83
90 Diagrams and drawings................................................................................................................. 90-1
Table of contents ........................................................................................................................ 90-2
Hydraulic circuit diagram ............................................................................................................. 90-3
Symbols in hydraulic circuit diagram ...................................................................................... 90-3
Hydraulic circuit diagram....................................................................................................... 90-7
Electric circuit diagram ................................................................................................................ 90-9
Symbols in electric circuit diagram ......................................................................................... 90-9
Electrical circuit diagram ..................................................................................................... 90-13
Electrical circuit diagram of air conditioner unit...................................................................... 90-23
Index.................................................................................................................................................................... 1
00-12 PC88MR-10