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SERVICING
29
TABLE OF CONTENTS
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
S-1 Checking Voltage .......................................... 30
S-2 Checking Wiring............................................ 30
S-3 Checking Thermostat, Wiring & Anticipator .. 30
S-3A Thermostat & Wiring ..................................... 30
S-3B Cooling Anticipator ........................................ 31
S-3C Heating Anticipator........................................ 31
S-3D Checking Encoded Thermostats ................... 31
S-4 Checking Transformer & Control Circuit ....... 32
S-5 Checking Cycle Protector ............................. 32
S-6 Checking Time Delay Relay .......................... 32
S-7 Checking Contactor and/or Relays................ 33
S-8 Checking Contactor Contacts ....................... 33
S-9 Checking Fan Relay Contact ........................ 33
S-10 Copeland Comfort™ Alert Diagnostics .......... 34
S-11 Checking Loss of Charge Protector............... 36
S-15 Checking Capacitor ....................................... 36
S-15A Resistance Check......................................... 37
S-15B Capacitance Check ....................................... 37
S-16A Checking Fan & Blower Motor
Windings (PSC Motors) ............................... 37
S-16B Checking Fan & Blower Motor (ECM Motors) 38
S-16C Checking ECM Motor Windings .................... 41
S-16D ECM CFM Adjustments ................................ 41
S-16E Checking GE X13™ Motors .......................... 42
S-17 Checking Compressor Windings ................... 43
S-17A Resistance Test ............................................ 43
S-17B Ground Test .................................................. 43
S-17D Operation Test .............................................. 44
S-18 Testing Crankcase Heater (optional item) ..... 44
S-21 Checking Reversing Valve Solenoid .............. 44
S-24 Testing Defrost Control .................................. 44
S-25 Testing Defrost Thermostat ........................... 45
S-40 MBR & AR*F Electronic Blower Time Delay.. 45
S-41 MBE & AEPF with Single Speed
Air Conditioning ............................................ 47
S-41A MBE & AEPF with Single Speed
Heat Pumps ................................................. 47
S-60 Electric Heater (optional item)....................... 49
S-61A Checking Heater Limit Control(S) .................. 50
S-61B Checking Heater Fuse Line........................... 50
S-62 Checking Heater Elements ........................... 50
S-100 Refrigeration Repair Practice......................... 50
S-101 Leak Testing ................................................. 51
S-102 Evacuation .................................................... 51
S-103 Charging ........................................................ 52
S-104 Checking Compressor Efficiency .................. 53
S-105A Piston Kit Chart ............................................ 53
S-105B Thermostatic Expansion Valve ...................... 53
S-106 Overfeeding ................................................... 54
S-107 Underfeeding ................................................. 54
S-108 Superheat ..................................................... 54
S-109 Checking Subcooling .................................... 55
S-110 Checking Expansion Valve Operation ........... 55
S-111 Fixed Orifice Restriction Devices .................. 56
S-112 Checking Restricted Liquid Line .................... 56
S-113 Refrigerant Overcharge .................................. 56
S-114 Non-condensables ........................................ 56
S-115 Compressor Burnout ..................................... 56
S-120 Refrigerant Piping .......................................... 57
S-122 Replacing Reversing Valve ............................ 59
S-202 Duct Static Pressure
& Static Pressure Drop Across Coils ............ 59
S-203 Air Handler External Static ........................... 59
S-204 Coil Static Pressure Drop ............................. 60