37
SERVICING
SERVICING TABLE OF CONTENTS
S-1 CHECKING VOLTAGE ......................................................38
S-2 CHECKING WIRING ........................................................38
S-3E CTK0*** COMFORTNET™ THERMOSTAT .......................38
S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT ......51
S-6 CHECKING TIME DELAY RELAY .......................................51
S-8A CHECKING UNITARY (UC) CONTROL COMPRESSOR
CONTACTOR/RELAY CONTACTS .....................................51
S-9 CHECKING HIGH AND LOW VOLTAGE TO ECM MOTOR .52
S-10A COPELAND COMFORT ALERT™ UNITARY (UC)CONTROL
DIAGNOSTICS ................................................................52
S-12 CHECKING HIGH PRESSURE CONTROL ..........................73
S-13 CHECKING LOW PRESSURE CONTROL ...........................73
S-14 CHECKING HIGH AND LOW PRESSURE
SWITCH VOLTAGE ..........................................................73
S-15 CHECKING CAPACITOR ..................................................73
S-15A RESISTANCE CHECK USING A DIGITAL MULTI-METER ....73
S-15B CAPACITANCE CHECK USING A DIGITAL MULTI-METER
(IN CAPACITANCE ™ ECM MOTORS ...............................74
S-16H ECM CFM ADJUSTMENTS DVPTC/MBVC .......................77
S-17 CHECKING COMPRESSOR ...............................................83
S-17A RESISTANCE TEST ...........................................................83
S-17B GROUND TEST ...............................................................83
S-17C UNLOADER TEST PROCEDURE .......................................84
S-17D OPERATION TEST ...........................................................84
S-18 TESTING CRANKCASE HEATER (OPTIONAL ITEM) ...........85
S-21 CHECKING REVERSING VALVE AND SOLENOID ..............85
S-24 TESTING DEFROST CONTROL.........................................85
S-26 TESTING TEMPERATURE SENSORS (COMFORTNET
READY MODELS ONLY) ..................................................86
S-40A DVPTC/MBVC ELECTRONIC BLOWER/HEATER
CONTROL ......................................................................86
S-60 ELECTRIC HEATER (OPTIONAL ITEM) .............................90
S-61A CHECKING HEATER LIMIT CONTROL(S) ..........................91
S-61B CHECKING HEATER FUSE LINK(OPTIONAL
ELECTRIC HEATERS) .......................................................91
S-62 CHECKING HEATER ELEMENTS ......................................91
S-100 REFRIGERATION REPAIR PRACTICE ................................91
S-101 LEAK TESTING (NITROGEN OR NITROGEN-TRACED) ......92
S-102 EVACUATION .................................................................92
S-103 CHARGING ....................................................................93
S-104 CHECKING COMPRESSOR EFFICIENCY ...........................94
S-106 OVERFEEDING ...............................................................94
S-107 UNDERFEEDING ............................................................94
S-108 SUPERHEAT ...................................................................94
S-109 CHECKING SUBCOOLING ...............................................95
S-110 CHECKING EXPANSION VALVE OPERATION ...................95
S-112 CHECKING RESTRICTED LIQUID LINE .............................95
S-113 OVERCHARGE OF REFRIGERANT ...................................95
S-114 NON-CONDENSABLES ...................................................96
S-115 COMPRESSOR BURNOUT ..............................................99
S-120 REFRIGERANT PIPING ...................................................99
S-203 SINGLE PIECE AIR HANDLER EXTERNAL STATIC
PRESSURE ....................................................................100
S-203A TWO PIECE AIR HANDLER EXTERNAL STATIC
PRESSURE ....................................................................100
