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
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3) Plug the appliance back into the electrical outlet. If appliance was in defrost when power
supply was disconnected, defrost is terminated and normal cooling cycle begins when
power supply is reconnected.
4) Startup/Cool Down–There is a slight delay (solid red LED for 5 sec., then ashing
green LED). Temperature above setpoint at CTh and if applicable, conrm appliance is
not in a defrost cycle (PT and Freezers). Comp, CondFM, and EvapFM energize. 2-min.
Comp on timer starts.
Freezers: PH, and MH energize.
a) CTh Diagnosis: If CTh fails, a red LED ashes along with the green LED on the CM.
Conrm CTh is properly connected to CM. Check Ohm reading of CTh. Replace as
needed.
b) TD Diagnosis: Conrm TD is set between 4 and 5. Check Ohm reading of TD.
Replace as needed.
c) CM Diagnosis: Conrm green LED is ashing. If not, check for 115VAC between
CM 2 (L) black (BK) wire and CM 3 white (W) neutral wire. If 115VAC is not present,
check power cord connections and breaker/fuse. Conrm wiring connections are
secure for both CM 2 (L) black (BK) (power supply) and CM 3 white (W) (neutral).
If 115VAC is present and green LED is not ashing, replace CM.
d) Comp/CondFM Diagnosis: Check that Comp and ConFM energize. If not, conrm
that the temperature is above setpoint. Next, check for 115VAC at CM (C) 1 brown
(BR) wire to neutral (W) wire. If 115VAC is not present, replace CM. If 115VAC is
present, check HPS continuity (if applicable). See "f) HPS Activation" below.
Comp: If 115VAC is present, check Comp external overload, start cap, start relay, and
Comp motor windings. Replace as needed.
CondFM: If 115VAC is present, check fan blade for binding, then check ConFM motor
windings.
e) EvapFM Diagnosis: Check that EvapFM(s) energize. If not, check for 115VAC at
CM (F) 5 dark blue (DBU) wire to neutral (W) wire. If 115VAC is not present, replace
CM. If 115VAC is present, check fan blades for binding, then check EvapFM motor
windings.
f) HPS Activation (CRMR60 and CRMR72 Prep Table and Freezer Models):
Check continuity of HPS. If open, allow time for system pressure to equalize and
HPS to reset. If HPS does not reset, replace HPS and diagnose reason for HPS
activation. Conrm ConFM is energized and fan blade turns freely. Check that the
condenser coil is not clogged or restricted. Check that there are no restrictions in the
refrigeration circuit (drier).
g) PH and MH Diagnosis (Freezer only): PH and MH follow Comp operation. When
Comp is energized, PH and MH are energized. If 115VAC is present, check amp draw
of PH and MH. If an amp reading is not present, check the continuity of PH and MH.
If defective, replace PH or MH.
If Comp, ConFM, and EvapFM are energized and the cabinet does not cool down,
check for a restriction in the refrigeration circuit, low refrigerant charge, or inefficient
Comp.