GSX14 Service Manual

SERVICING
67
HIGH VOLTAGE!
Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to
do so may cause property damage, personal injury or death.
TABLE OF CONTENTS
S-1 CHECKING VOLTAGE ............................................. 67
S-2 CHECKING WIRING ............................................... 67
S-3 CHECKING THERMOSTAT, WIRING,
AND ANTICIPATOR ................................................. 67
S-3A THERMOSTAT AND WIRING .................................. 67
S-3B COOLING ANTICIPATOR ........................................ 68
S-3C HEATING ANTICIPATOR ......................................... 68
S-3E CTK0*** COMFORTNET™ THERMOSTAT ............ 68
S-4 CHECKING TRANSFORMER AND CONTROL
CIRCUIT .................................................................. 70
S-5 CHECKING CYCLE PROTECTOR ......................... 74
S-6 CHECKING TIME DELAY RELAY ............................ 74
S-7 CHECKING CONTACTOR AND/OR RELAYS .........74
S-8 CHECKING CONTACTOR CONTACTS.................. 74
S-8A CHECKING UNITARY (UC) CONTROL
COMPRESSOR CONTACTOR/RELAY
CONTACTS ............................................................. 75
S-9 CHECKING FAN RELAY CONTACTS ..................... 75
S-10 COPELAND COMFORT ALERT™ ..........................76
S-10A COPELAND CORESENSE™
UNITARY (UC) CONTROL DIAGNOSTICS ........... 81
S-10B COPELAND CORESENSE™
DIAGNOSTICS 3-WIRE
MODLE................................................................... ...... 95
S-11 CHECKING LOSS OF CHARGE PROTECTOR ..... 99
S-12 CHECKING HIGH PRESSURE CONTROL ........... 99
S-13 CHECKING LOW PRESSURE CONTROL ............ 99
S-15 CHECKING CAPACITOR ........................................ 99
S-15A RESISTANCE CHECK .......................................... 100
S-15B CAPACITANCE CHECK ........................................100
S-16A CHECKING FAN AND BLOWER MOTOR
WINDINGS (PSC MOTORS) .................................101
S-16B CHECKING FAN AND BLOWER MOTOR
(ECM MOTORS) ....................................................101
S-16C CHECKING ECM MOTOR WINDINGS .................104
S-16D ECM CFM ADJUSTMENTS MBE / AEPF ............... 104
S-16F CHECKING HIGH EFFICIENCY MOTORS...........106
S-16E BLOWER PERFORMANCE DATA......................... 106
S-16G CHECKING EMERSON ULTRATECH
TM
ECM MOTORS ...................................................... 107
S-16H ECM CFM ADJUSTMENTS AVPTC/MBVC ............109
S-17 CHECKING COMPRESSOR ................................124
S-17A RESISTANCE TEST .............................................. 124
S-17B GROUND TEST ................................................... 124
S-17C UNLOADER TEST PROCEDURE ........................125
S-17D OPERATION TEST ................................................125
S-17E CHECKING 3-PHASE SCROLL COMPRESSOR
ROTATION ..............................................................126
S-18 TESTING CRANKCASE HEATER
(OPTIONAL ITEM) ................................................. 126
S-21 CHECKING REVERSING VALVE AND SOLENOID126
S-24 TESTING DEFROST CONTROL ..........................126
S-25 TESTING DEFROST THERMOSTAT .................... 127
S-26 TESTING TEMPERATURE SENSORS
(COMFORTNET READY MODELS ONLY) ...........127
S-40 MBR/AR*F ELECTRONIC BLOWER
TIME DELAY RELAY .............................................. 127
S-40A AVPTC/MBVC ELECTRONIC
BLOWER/HEATER CONTROL ............................. 128
S-50 CHECKING HEATER LIMIT CONTROL(S)...........142
S-52 CHECKING HEATER ELEMENTS ........................142
S-60 ELECTRIC HEATER (OPTIONAL ITEM) ...............143
S-61A CHECKING HEATER LIMIT CONTROL(S)...........143
S-61B CHECKING HEATER FUSE LINK
(OPTIONAL ELECTRIC HEATERS) ......................144
S-62 CHECKING HEATER ELEMENTS ........................144
S-100 REFRIGERATION REPAIR PRACTICE ................144
S-101 LEAK TESTING (NITROGEN
OR NITROGEN-TRACED) ....................................145
S-102 EVACUATION ........................................................ 145
S-103 CHARGING ...........................................................146
S-104 CHECKING COMPRESSOR EFFICIENCY .......... 146
S-105A PISTON CHART FOR
ASX13, ANX13, ANZ13, GSZ13, VSX13, SSX14,
ASX14, GSX14, ASZ13, GSZ13, GSZ14, VSZ13,
SSZ14, ASX16, GSX16, ASZ16 UNITS ..............147
S-105B THERMOSTATIC EXPANSION VALVE ....................155
S-106 OVERFEEDING..................................................... 155
S-107 UNDERFEEDING ................................................. 155
S-108 SUPERHEAT .........................................................155
S-109 CHECKING SUBCOOLING .................................. 158
S-109A TWO SPEED APPLICATION .................................158
S-110 CHECKING EXPANSION VALVE OPERATION ..... 159
S-111 FIXED ORIFICE RESTRICTOR DEVICES ...........159
S-112 CHECKING RESTRICTED LIQUID LINE ............. 159
S-113 OVERCHARGE OF REFRIGERANT .....................159
S-114 NON-CONDENSABLES ....................................... 160
S-115 COMPRESSOR BURNOUT .................................160
S-120
REFRIGERANT PIPING ........................................160
S-202 DUCT STATIC PRESSURES AND/OR
STATIC PRESSURE DROP ACROSS COILS ...... 167
S-203 AIR HANDLER EXTERNAL STATIC ...................... 167
S-204 COIL STATIC PRESSURE DROP ......................... 168