GSZH5 Service Manual
2
IMPORTANT INFORMATION
CHECKING ECM MOTOR WINDINGS ........................ 81
ECM CFM ADJUSTMENTS MBE/AEPF .....................81
BLOWER PERFORMANCE DATA ..............................86
CHECKING HIGH EFFICIENCY MOTORS .................86
EEM BLOWER REPLACEMENT .................................87
MBR/AR*F ELECTRONIC BLOWER TIME DELAY
RELAY ..........................................................................88
CHECKING COMPRESSOR ........................................88
RESISTANCE TEST ..................................................... 89
GROUND TEST ...........................................................89
UNLOADER TEST PROCEDURE ..............................90
OPERATION TEST.......................................................90
CHECKING 3-PHASE SCROLL COMPRESSOR
ROTATION ...................................................................91
TESTING CRANKCASE HEATER
(OPTIONAL ITEM) ......................................................91
CHECKING REVERSING VALVE AND SOLENOID ....91
TESTING DEFROST CONTROL .................................92
TESTING DEFROST THERMOSTAT ...........................92
CHECKING HEATER LIMIT CONTROL(S) ..................92
CHECKING HEATER ELEMENTS ............................... 93
ELECTRIC HEATER (OPTIONAL ITEM) .....................93
CHECKING HEATER LIMIT CONTROL(S) ..................94
CHECKING HEATER ELEMENTS ............................... 94
REFRIGERATION REPAIR PRACTICE ....................... 94
STANDING PRESSURE TEST ....................................95
LEAK TESTING
(NITROGEN OR NITROGEN-TRACED) ...................... 95
SYSTEM EVACUATION ............................................... 95
DEEP VACUUM METHOD (RECOMMENDED) ..........95
TRIPLE EVACUATION METHOD (ALTERNATE) ........96
CHARGING ..................................................................96
FINAL CHARGE ADJUSTMENT ..................................97
CHECKING COMPRESSOR EFFICIENCY .................98
OVERFEEDING ...........................................................98
UNDERFEEDING ......................................................... 98
CHECKING SUPERHEAT ............................................ 98
SUBCOOLING ON EXPANSION VALVE SYSTEM......99
CHECKING EXPANSION VALVE OPERATION ........... 99
CHECKING RESTRICTED LIQUID LINE ...................100
OVERCHARGE OF REFRIGERANT .........................100
NON-CONDENSABLES ............................................. 100
COMPRESSOR BURNOUT ....................................... 100
REFRIGERANT PIPING .............................................103
DUCT STATIC PRESSURES .....................................103
SINGLE PIECE AIR HANDLER
EXTERNAL STATIC ...................................................103
TWO PIECE AIR HANDLER EXTERNAL STATIC
PRESSURE ................................................................ 104
FURNACE EXTERNAL STATIC PRESSURE ............104
PERIODIC MAINTENANCE .......................................104
WIRING DIAGRAMS ..................................................106
IMPORTANT NOTICES
RECOGNIZE SAFETY SYMBOLS, WORDS AND
LABELS
WARNING
WARNING
HIGH VOLTAGE
WARNING