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B. Sequence of Operation
1. Sequence Cycles and Shutdown
The steps in the sequence are as outlined below.
Note: 1. There is a slight delay at startup.
2. There is a 2-minute minimum Comp on time and a 2-minute minimum Comp off
time.
3. EvapFM de-energizes when door is opened on FS and when upper door is
opened on HS.
4. A float-switch controlled condensate pump (located on top of the unit) is used to
pump evaporator condensation to the condensate pan.
5. On freezers, EvapFM is de-energized during defrost.
a) Refrigerator
1. Startup/Cool Down
EvapFM, MH, and PH energize. There is a slight delay before cabinet temperature
appears on DM and Comp and ConFM energize.
2. Cool Down Achieved
CM monitors cooling of the cabinet via CTh. CTh cools to 3
EvapFM, MH, and PH continue. Comp and ConFM de-energize.
3. Cool Down Restart
CTh warms to 3
ConFM energize.
4. Defrost
"dEF" is displayed during defrost. There is a 20-minute minimum defrost time and a
1-hour maximum defrost time.
a) Temperature Initiation: When DTh cools to 8.6°F (-13°C) defrost begins. EvapFM, MH,
and PH continue. Comp and ConFM de-energize.
b) Manual Initiation: Manual defrost may be initiated by pressing and holding the lower
button until "dEF" appears on DM. EvapFM, MH, and PH continue. Comp and ConFM
de-energize.
c) Termination: DTh warms to 40
ConFM energize, 2-minute temperature display delay timer starts.
2-minute temperature display delay timer terminates and temperature display returns
to DM.
Note: There is a 2-hour minimum defrost interval.
Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;
CTh–cabinet thermistor; DM–display module; DTh–defrost thermistor;
EvapFM–evaporator fan motor; MH–mullion heater; PH–perimeter heater
F (1.7
C) above setpoint. EvapFM, MH, and PH continue. Comp and
°
°
F (4.4
°
F (1.7
°
C). EvapFM, MH, and PH continue. Comp and
°
10
C) below setpoint.
°
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