Service Manual

12
B. Sequence of Operation
1. Sequence Cycles and Shutdown
The steps in the sequence are as outlined below.
Note: 1. A oat-switch controlled condensate pump (located on top of the appliance) is
used to pump evaporator condensation to the condensate pan.
2. When exposed to high temperatures, a high-temperature alarm "Hi" may occur
at start-up. To silence the alarm, press and release the upper button. Alarm
automatically resets when temperature drops to an acceptable range.
a) Refrigerator
1. Startup/Cool Down
EvapFM and MH energize. There is a slight delay before cabinet temperature appears on
DMand Comp and ConFM energize. On glass door models, the interior light is controlled
with a manual light switch. When the light switch is in the "ON" position, the interior light
stays on constantly. See Fig. 1. On solid door models, the interior light is controlled by the
door switch.
2. Cool Down Achieved
CM monitors cooling of the cabinet via CTh.
CTh cools to 3°F (1.7°C) below setpoint.
EvapFM and MH continue. Comp and
ConFM de-energize.
3. Cool Down Restart
CTh warms to 3°F (1.7°C) above setpoint.
EvapFM and MH continue. Comp and
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 and
MH 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 and MH continue. Comp and ConFM
de-energize.
c) Termination: DTh warms to 40
°F (4.4°C). EvapFM and MH continue. Comp and 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
Fig. 1
Full Glass
Light Switch