CONTENTS ............................................................................................................................................ 80-2
ABBREVIATION LIST ............................................................................................................................. 80-4
AIR CONDITIONER SYSTEM ................................................................................................................ 80-9
PRECAUTIONS FOR REFRIGERANT ............................................................................................ 80-9
AIR CONDITIONER COMPONENT ............................................................................................... 80-10
SPECIFICATIONS OF AIR CONDITIONER ................................................................................... 80-12
CONFIGURATION AND FUNCTION OF REFRIGERATION CYCLE ............................................. 80-13
OUTLINE OF REFRIGERATION CYCLE....................................................................................... 80-14
COMPONENT PARTS OF AIR CONDITIONER SYSTEM .................................................................... 80-16
AIR CONDITIONER UNIT.............................................................................................................. 80-16
COMPONENT PARTS OF AIR CONDITIONER UNIT.................................................................... 80-20
AIR CONDITIONER CONTROLLER.............................................................................................. 80-24
COMPRESSOR ............................................................................................................................. 80-25
CONDENSER ................................................................................................................................ 80-27
SENSORS FOR AIR CONDITIONER SYSTEM............................................................................. 80-29
EXPLANATION OF PROCEDURE FOR TESTING AND TROUBLESHOOTING OF AIR CONDITIONER......
.......................................................................................................................................................... 80-31
CIRCUIT DIAGRAM AND ARRANGEMENT OF CONNECTOR PINS FOR AIR CONDITIONER ......... 80-33
AIR CONDITIONER SYSTEM DIAGRAM ............................................................................................. 80-35
INPUT AND OUTPUT SIGNALS OF AIR CONDITIONER CONTROLLER .................................... 80-36
INSTALLATION LOCATIONS OF AIR CONDITIONER PARTS AND ARRANGEMENT OF CONNECTORS ..
.......................................................................................................................................................... 80-38
TESTING AIR LEAKAGE (DUCT)......................................................................................................... 80-42
METHOD FOR TESTING AIR LEAKAGE (DUCT) ......................................................................... 80-42
TESTING AIR CONDITIONER USING SELF-DIAGNOSIS FUNCTION................................................ 80-44
HOW TO OPEN THE ELECTRICAL SYSTEM ABNORMALITY RECORD SCREEN IN SERVICE MODE
OF THE MACHINE MONITOR .......................................................................................................... 80-45
TEST VENT (MODE) CHANGEOVER .................................................................................................. 80-46
METHOD FOR TESTING VENT (MODE) CHANGEOVER ............................................................ 80-46
TESTING FRESH/RECIRC AIR CHANGEOVER.................................................................................. 80-48
METHOD FOR TESTING FRESH/RECIRC AIR CHANGEOVER .................................................. 80-48
TEST SUNLIGHT SENSOR.................................................................................................................. 80-49
METHOD FOR TESTING SUNLIGHT SENSOR............................................................................ 80-49
TEST (DUAL) PRESSURE SWITCH FOR REFRIGERANT.................................................................. 80-50
METHOD FOR TESTING (DUAL) PRESSURE SWITCH FOR REFRIGERANT............................ 80-50
TEST RELAYS...................................................................................................................................... 80-51
METHOD FOR TESTING RELAYS................................................................................................ 80-51
AIR CONDITIONER TROUBLESHOOTING CHART 1 ......................................................................... 80-52
AIR CONDITIONER TROUBLESHOOTING CHART 2 ......................................................................... 80-53
INFORMATION DESCRIBED IN TROUBLESHOOTING TABLE........................................................... 80-56
FAILURE CODE [879AKA] A/C Recirculation Air Temperature Sensor Open Circuit............................. 80-58
FAILURE CODE [879AKB] A/C Recirculation Air Temperature Sensor Short Circuit............................. 80-59
FAILURE CODE [879BKA] A/C Fresh Air Temperature Sensor Open Circuit ........................................ 80-60
FAILURE CODE [879BKB] A/C Fresh Air Temperature Sensor Short Circuit ........................................ 80-62
FAILURE CODE [879CKA] Ventilating Sensor Open Circuit.................................................................. 80-64
FAILURE CODE [879CKB] Ventilating Sensor Short Circuit.................................................................. 80-65
FAILURE CODE [879DKZ] Sunlight Sensor Open Circuit or Short Circuit............................................. 80-66
FAILURE CODE [879EMC] Ventilation Damper Malfunction ................................................................. 80-68
FAILURE CODE [879FMC] Air Mix Damper Malfunction....................................................................... 80-69
FAILURE CODE [879GKX] Refrigerant Pressure Input Signal Out of Range ........................................ 80-70
A-1 TROUBLESHOOTING FOR POWER SUPPLY SYSTEM (AIR CONDITIONER DOES NOT OPERATE).
.......................................................................................................................................................... 80-72
A-2 TROUBLESHOOTING FOR COMPRESSOR AND REFRIGERANT SYSTEM (AIR IS NOT COOLED)...
.......................................................................................................................................................... 80-74
A-3 TROUBLESHOOTING FOR BLOWER MOTOR SYSTEM (NO AIR COMES OUT OR AIR FLOW IS
ABNORMAL) ..................................................................................................................................... 80-77
A-4 TROUBLESHOOTING FOR FRESH/RECIRC AIR CHANGEOVER............................................... 80-79
TROUBLESHOOTING USING GAUGE PRESSURE............................................................................ 80-81
00 INDEX AND FOREWORD
INDEX
PC290LC-11
00-17
