Service manual
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. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
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6) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM continues.
Comp and ConFM de-energize. Diagnosis: Conrm Comp and ConFM de-energize.
Ifnot, and Comp and ConFM were energized longer than 2 min., check CTh status.
See"II.C. Thermistor Check." If CTh ohm reading is in range and Comp and ConFM
were energized longer than 2 min., check for 115VAC at CM C1 (BR or BK) to
neutral(W). If115VAC is present, replace CM.
7) Defrost– 6-hr. defrost timer terminates and DTh is at or lower than39°F(3.8°C),
defrost starts. If on, Comp and EvapFM icons turn off. Comp, ConFM, and EvapFM
de-energize. The defrost icon turns on and "dEF" is displayed. DHenergizes. There
is a 5-min. minimum defrost time, 1-hr. maximum defrost time, 6-hr. minimum defrost
interval, and 8-hr. maximum defrost interval.
1a) Time-Initiation: 6-hr. defrost interval timer terminates. Control module checks DTh.
IfDTh is at or lower than 39°F (3.8°C), defrost starts. Ifon, Comp and EvapFM
icons turn off. Comp, ConFM, and EvapFM de-energize. Defrosticon turns on and
"dEF"is displayed. DHenergizes. IfDTh is greater than 39°F (3.8°C), defrost is
delayed for 2 hrs. (8-hr. defrost interval timer). Once the 8-hr. defrost interval timer
terminates, defrost starts regardless of evaporator temperature.
1b) Manual-Initiation: To initiate a manual defrost, press and release the manual defrost
button on display. If on, Comp and EvapFM icons turn off. Comp, ConFM, and
EvapFM de-energize. Defrost icon turns on and "dEF" is displayed. DHenergizes.
2) Defrost-Termination:
(1) DTh warms to 41°F (5°C). DH de-energizes. 1-min. Comp/EvapFM delay timer
and 11-min. temperature display delay timer start. Defrost icon and "dEF" display
continue.
(2) 1-min. Comp/EvapFM delay timer terminates. Defrost icon turns off. Comp icon
turns on. Comp and ConFM energize. EvapFM on CRES energizes. If DTh is
at 36°F(2°C) or lower, EvapFM icon turns on and EvapFM on CPT energizes.
"dEF" display continues. 6-hr. defrost interval timer resets.
Note: If DTh is 37°F (3°C) or higher when 1-min. Comp/EvapFM delay timer
terminates, CPT EvapFM remains off until evaporator temperature is 36°F(2°C)
or lower.
(3) 11-min. temperature display delay timer terminates. Cabinet temperature replaces
"dEF."
Defrost Diagnosis:
1) Time-Initiation: Has 6-hr. defrost timer terminated? Before proceeding, conrm DTh
status. See "II.C. Thermistor Check." Manual-Initiation: Press and release the
defrost button.
Check the following:
(1) CM Diagnosis: Conrm defrost icon turns on, Comp and EvapFM icons turn off,
and "dEF" replaces cabinet temperature on display. If not, replaceCM.
(2) DH Diagnosis: Conrm DH energizes. If not, check for 115VAC at CM H4 (R) to
neutral (W). If 115VAC is not present, replace CM. If115VAC is present, check
DST continuity. If open, let cool and reset. If DST does not close, replace DST.
IfDST is closed, check DH amp draw and continuity.