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00 INDEX AND FOREWORD
SENSORS FOR AIR CONDITIONER SYSTEM............................................................................. 80-24
EXPLANATION OF PROCEDURE FOR TESTING AND TROUBLESHOOTING OF AIR CONDITIONER......
.......................................................................................................................................................... 80-26
CIRCUIT DIAGRAM AND ARRANGEMENT OF CONNECTOR PINS FOR AIR CONDITIONER ......... 80-28
AIR CONDITIONER SYSTEM DIAGRAM ............................................................................................. 80-30
INPUT AND OUTPUT SIGNALS OF AIR CONDITIONER CONTROLLER .................................... 80-31
INSTALLATION LOCATIONS OF AIR CONDITIONER PARTS AND ARRANGEMENT OF CONNECTORS ..
.......................................................................................................................................................... 80-33
TESTING AIR LEAKAGE (DUCT)......................................................................................................... 80-37
METHOD FOR TESTING AIR LEAKAGE (DUCT) ......................................................................... 80-37
TESTING AIR CONDITIONER USING SELF-DIAGNOSIS FUNCTION................................................ 80-39
HOW TO OPEN THE ELECTRICAL SYSTEM ABNORMALITY RECORD SCREEN IN SERVICE MODE
OF THE MACHINE MONITOR .......................................................................................................... 80-40
TEST VENT (MODE) CHANGEOVER .................................................................................................. 80-41
METHOD FOR TESTING VENT (MODE) CHANGEOVER ............................................................ 80-41
TESTING FRESH/RECIRC AIR CHANGEOVER.................................................................................. 80-43
METHOD FOR TESTING FRESH/RECIRC AIR CHANGEOVER .................................................. 80-43
TEST SUNLIGHT SENSOR.................................................................................................................. 80-44
METHOD FOR TESTING SUNLIGHT SENSOR............................................................................ 80-44
TEST (DUAL) PRESSURE SWITCH FOR REFRIGERANT.................................................................. 80-45
METHOD FOR TESTING (DUAL) PRESSURE SWITCH FOR REFRIGERANT............................ 80-45
TEST RELAYS...................................................................................................................................... 80-46
METHOD FOR TESTING RELAYS ................................................................................................ 80-46
AIR CONDITIONER TROUBLESHOOTING CHART 1 ......................................................................... 80-47
AIR CONDITIONER TROUBLESHOOTING CHART 2 ......................................................................... 80-48
INFORMATION DESCRIBED IN TROUBLESHOOTING TABLE........................................................... 80-51
FAILURE CODE [879AKA] A/C Recirculation Air Temperature Sensor Open Circuit............................. 80-53
FAILURE CODE [879AKB] A/C Recirculation Air Temperature Sensor Short Circuit ............................. 80-54
FAILURE CODE [879BKA] A/C Fresh Air Temperature Sensor Open Circuit ........................................ 80-55
FAILURE CODE [879BKB] A/C Fresh Air Temperature Sensor Short Circuit ........................................ 80-57
FAILURE CODE [879CKA] Ventilating Sensor Open Circuit.................................................................. 80-59
FAILURE CODE [879CKB] Ventilating Sensor Short Circuit.................................................................. 80-60
FAILURE CODE [879DKZ] Sunlight Sensor Open Circuit or Short Circuit............................................. 80-61
FAILURE CODE [879EMC] Ventilation Damper Malfunction ................................................................. 80-63
FAILURE CODE [879FMC] Air Mix Damper Malfunction ....................................................................... 80-64
FAILURE CODE [879GKX] Refrigerant Pressure Input Signal Out of Range ........................................ 80-65
A-1 TROUBLESHOOTING FOR POWER SUPPLY SYSTEM (AIR CONDITIONER DOES NOT OPERATE).
.......................................................................................................................................................... 80-67
A-2 TROUBLESHOOTING OF COMPRESSOR 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 USING GAUGE PRESSURE............................................................................ 80-76
CONNECTION OF SERVICE TOOL ..................................................................................................... 80-78
METHOD FOR CONNECTING SERVICE TOOL ........................................................................... 80-78
PRECAUTIONS FOR DISCONNECTING AND CONNECTING HOSES AND TUBES IN AIR CONDITION-
ER PIPINGS...................................................................................................................................... 80-80
HANDLE COMPRESSOR OIL .............................................................................................................. 80-82
METHOD FOR REPLACING DESICCANT ........................................................................................... 80-84
90 CIRCUIT DIAGRAMS ............................................................................................................................... 90-1
CONTENTS ............................................................................................................................................ 90-2
HYDRAULIC CIRCUIT DIAGRAM .......................................................................................................... 90-3
SYMBOLS USED IN HYDRAULIC CIRCUIT DIAGRAM .................................................................. 90-3
HYDRAULIC CIRCUIT DIAGRAM ................................................................................................... 90-7
ELECTRICAL CIRCUIT DIAGRAM ......................................................................................................... 90-9
SYMBOLS USED IN ELECTRICAL CIRCUIT DIAGRAM................................................................. 90-9
ELECTRICAL CIRCUIT DIAGRAM (1/7)........................................................................................ 90-13
ELECTRICAL CIRCUIT DIAGRAM (2/7)........................................................................................ 90-15
PC240LC-11
INDEX
00-17
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