Service Manual

17
5) Cool Down Achieved–CTh reaches setpoint temperature.
All Models: Comp and ConFM de-energize.
UR/WR and UF/WF: EvapFM de-energize.
SR: EvapFM continues.
Diagnosis: If temperature setpoint achieved and Comp, ConFM, and EvapFMdoes not
de-energize (except SR), check CTh continuity. See "II.D. Thermistor Check."
If CTh is defective, replace. If CTh is good and either the Comp, ConFM, or EvapFM
continue, replace CM. SR: If EvapFM de-energizes, check for 115VAC at CM Aux 1
black-smooth (BK-SM) wire to neutral white (W) wire. If 115VAC is not present, replace
CM. If 115VAC is present, check fan blades for binding, then check EvapFM motor
windings.
6) Defrost–Manual, temperature, and time-initiated defrost with temperature-terminated
defrost. Defrost has a 5-min. minimum time and a 55-min. maximum time on UR/WR,
a 1-hr. maximum time on UF/WF, and a 45-min. maximum time on SR.
1a) Manual-Initiation (All): Unplug the appliance from the electrical outlet, then move
the CTCD to the off position. Plug the appliance back in to the electrical outlet. The
green, yellow, and red LED turn on. Rotate the CTCD clockwise to position 4(green
and red LED turn off, yellow LED remains on), move counter-clockwise to position
2(yellow LED turns off and red LED turns on), move back clockwise again to
position 8 (red LED remains on and green LED turns on). Defrost initiates.
Note: Once at the number position, conrm the appropriate LEDs turn off and on.
If not, move the CTCD back and forth until the LED turns on. Once the LED is on,
move to the next position.
1b) Temperature Initiation:
(1) UR/WR: DTh is at or below -4°F (-20°C), defrost starts. CM red and green LED
turn on. If energized, Comp and ConFM de-energize. EvapFM continues.
(2) SR: No temperature initiation. Time only.
(3) UF/WF: DTh at or below -31°F (-35°C), defrost starts. CM red and green LED
turn on. If energized, Comp, ConFM, EvapFM, PH, and MH de-energize.
DH energizes. 5-min. minimum DT starts and 1-hr. maximum DT starts.
1c) Time Initiation (All):
5-hr. cumulative compressor run timer terminates, defrost starts.
(1) UR/WR: Comp and ConFM de-energize. EvapFM continues. 5-min. minimum DT
starts and 55-min. maximum DT starts.
(2) SR: Comp, ConFM, and EvapFM de-energize. DH energizes. 5-min. minimum DT
starts and 45-min. maximum DT starts.
(3) UF/WF: Comp, ConFM, EvapFM, PH, and MH de-energize.
DH energizes. 5-min. minimum DT starts and 1-hr. maximum DT starts.
Note: There is a 1-hr. defrost lock-out after a defrost cycle terminates. This may be
bypassed by initiating a manual defrost or unplugging and plugging back in to
the electrical outlet.