Service Mnaual
Table Of Contents
- Important Safety Information
- I. Construction and Refrigeration Circuit Diagram
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- IV. Refrigeration Circuit and Component Service Information
- V. Preparing the Appliance for Periods of Non-Use
- VI. Disposal
- VII. Technical Information
- A. Electrical and Refrigerant Data
- B. Wiring Diagrams
- 1a. Undercounter and Worktop: Refrigerator; Cabinet Thermostat
- 1b. Undercounter and Worktop: Refrigerator; Cabinet Thermistor/Control Module
- 2a. Prep Table; Cabinet Thermostat (Without Defrost Heater)
- 2b. Prep Table; Cabinet Thermostat (With Defrost Heater)
- 2c. Prep Table; Cabinet Thermistor/Control Module
- 3a. Undercounter and Work Top: Freezer; Cabinet Thermostat
- 3b. Undercounter and Work Top: Freezer; Cabinet Thermistor/Control Module
15
B1. Thermostat Control Service Diagnosis
WARNING
• The appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.
• Risk of electric shock. Use extreme caution and exercise safe electrical practices.
• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
• Make sure all food zones are clean after the appliance is serviced.
The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.
See the table for default cabinet temperature control settings.
Model Default Cabinet Temperature
Control Setting
Approximate Default Temperature
Undercounter
Worktop
Between 4 and 5 Refrigerator: 34°F (1°C)
Freezer: -5°F (-21°C)
Prep Table 6 34°F (1°C)
Note: When checking voltage (115VAC), always choose a white (W) neutral wire to
establish a good neutral connection.
1. Undercounter and Worktop: Refrigerator
1) Unplug the appliance from the electrical outlet.
2) Remove the rear panel.
3) Plug the appliance back into the electrical outlet.
4) Startup/Cool Down–Temperature above setpoint. CTh closed. Comp, ConFM, and
EvapFM energize. Diagnosis: Conrm that Comp, ConFM, and EvapFM energize.
Ifnot, conrm that temperature is above setpoint and CTh is closed. Check both
terminals of CTh (BK) or (BR) to a neutral (W) for 115VAC. If 115VAC is present on
one terminal and not the other, replace CTh. If 115VAC is present on both terminals,
Check voltage at Comp, external protector, and Comp terminals. Check Comp winding
continuity. Check voltage on ConFM and EvapFM. Check ConFM and EvapFM winding
continuity and check fan blades for binding.
If Comp, ConFM, and EvapFM are energized and the cabinet temperature does not
cool down, check for a restriction in the refrigeration circuit, low refrigerant charge, or
inefficient Comp.5)
5) Cool Down Achieved–Temperature cools to setpoint. CThopens. Comp, ConFM, and
EvapFM de-energize. Note: EvapFM continues on CRMR60 and CRMR72.
Diagnosis: If temperature has cooled to setpoint and Comp and ConFM do not
de-energize, check CTh continuity. If CTh defective, replace CTh.
Note: EvapFM de-energizes with Comp on CRMR27 and CRMR48 and continues on
CRMR60 and CRMR72.