iv
Section 7 - Diagnostics and Component Function/Specification/
Check Procedures
Service Diagnostic Chart
Reach-In Does Not Run ....................................................................................................7-1
Cabinet Does Not Maintain Proper Temperature..............................................................7-2
Compressor Does Not Operate..........................................................................................7-3
Condensation on Cabinet and/or Floor..............................................................................7-3
Door(s) Difficult to Open..................................................................................................7-3
Component Function/Specifications/Check Procedures
Main On/Off Switch..........................................................................................................7-4
Relay..................................................................................................................................7-4
Temperature Control
Specifications ..............................................................................................................7-4
Refrigerator Sensing Bulb Location............................................................................7-5
Freezer Sensing Bulb Location ...................................................................................7-5
Light/Fan Switch(es)
Self-Contained Refrigerator - Fan Motor Wiring Change .......................................... 7-6
Defrost End and Fan Delay Thermostat............................................................................7-7
Automatic Defrost Time Clock.........................................................................................7-7
Defrost Heater (Calrod Heater) ......................................................................................... 7-9
Mullion (Door Frame) Heater ...........................................................................................7-9
Mullion (Door Frame) Heater Switch .............................................................................7-10
Drain Tube Heater...........................................................................................................7-10
Condensate Vaporizer Pan ..............................................................................................7-10
Diagnosing Compressor and Start Components Electrically
General ............................................................................................................................7-11
External Overload Check ................................................................................................7-11
Start Relay Check............................................................................................................ 7-11
Compressor Windings..................................................................................................... 7-12
Capacitor Check..............................................................................................................7-12
Section 8 - Component Replacement Procedures
Accessing Evaporator Assembly..........................................................................................8-1
Evaporator Fan(s) .................................................................................................................8-2
Evaporator Defrost (Calrod) Heater...................................................................................8-3
Mullion (Door) Heater ..........................................................................................................8-4
Drain Tube Heater ................................................................................................................8-5
Door Gasket(s).......................................................................................................................8-6
Reversing Door Swing and Adjusting Door Tension
Solid Door .........................................................................................................................8-7
Glass Door.......................................................................................................................8-10
Temperature/Humidity Chart for Condensation on Glass Doors..................................8-12
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