32
SERVICING
SERVICING TABLE OF CONTENTS
S-1
CHECKING VOLTAGE...........................................33
S-2
CHECKING WIRING.............................................33
S-3E CTK0*** COMFORTNETTM THERMOSTAT.........33
S-4
CHECKING TRANSFORMER AND CONTROL
CIRCUIT...............................................................46
S-6
CHECKING TIME DELAY RELAY............................46
S-8A CHECKING UNITARY (UC) CONTROL
COMPRESSOR CONTACTOR/RELAY CONTACTS..46
S-9
CHECKING HIGH AND LOW VOLTAGE TO ECM
MOTOR..............................................................47
S-10A COPELAND COMFORT ALERTTM UNITARY (UC)
CONTROL DIAGNOSTICS....................................48
S-12 CHECKING HIGH PRESSURE CONTROL...............69
S-13 CHECKING LOW PRESSURE CONTROL................69
S-14 CHECKING HIGH AND LOW PRESSURE
SWITCH VOLTAGE...............................................69
S-15 CHECKING CAPACITOR.......................................69
S-15A RESISTANCE CHECK USING A DIGITAL
MULTI-METER....................................................69
S-15B CAPACITANCE CHECK USING A DIGITAL
MULTI-METER (IN CAPACITANCE MODE)...........70
S-16G CHECKING EMERSON ULTRATECHTM
ECM MOTORS.....................................................70
S-16H ECM CFM ADJUSTMENTS DVPTC/MBVC............73
S-17 CHECKING COMPRESSOR...................................79
S-17A RESISTANCE TEST...............................................79
S-17B GROUND TEST....................................................79
S-17C UNLOADER TEST PROCEDURE ...........................80
S-17D OPERATION TEST................................................80
S-18 TESTING CRANKCASE HEATER
(OPTIONAL ITEM)..............................................81
S-21
CHECKING REVERSING VALVE AND SOLENOID..........81
S-24
TESTING DEFROST CONTROL.....................................81
S-26
TESTING TEMPERATURE SENSORS
(COMFORTNET READY MODELS ONLY)......................82
S-40A DVPTC/MBVC ELECTRONIC BLOWER/HEATER
CONTROL....................................................................82
S-60
ELECTRIC HEATER (OPTIONAL ITEM).........................87
S-61A CHECKING HEATER LIMIT CONTROL(S)......................87
S-61B CHECKING HEATER FUSE LINK
(OPTIONAL ELECTRIC HEATERS).................................88
S-62
CHECKING HEATER ELEMENTS...................................88
S-100 REFRIGERATION REPAIR PRACTICE............................88
S--101 LEAK TESTING
(NITROGEN OR NITROGEN-TRACED).........................89
S-102 EVACUATION..............................................................89
S-103 CHARGING.................................................................90
S-104 CHECKING COMPRESSOR EFFICIENCY........................91
S-106 OVERFEEDING............................................................91
S-107 UNDERFEEDING.........................................................91
S-108 SUPERHEAT.................................................................91
S-109 CHECKING SUBCOOLING............................................92
S-110 CHECKING EXPANSION VALVE OPERATION................92
S-112 CHECKING RESTRICTED LIQUID LINE.........................92
S-113 OVERCHARGE OF REFRIGERANT................................93
S-114 NON-CONDENSABLES................................................93
S-115 COMPRESSOR BURNOUT...........................................96
S-120 REFRIGERANT PIPING.................................................96
S-203 SINGLE PIECE AIR HANDLER EXTERNAL STATIC
PRESSURE...................................................................97
S-203A TWO PIECE AIR HANDLER EXTERNAL
STATIC PRESSURE.......................................................97