Electronic Control System
3-25
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Minimize Condensation on Refrigerator Door Glass (Models Produced with Glass Doors Only)
On models with glass refrigerator doors a low DC voltage, five (5) watt braided wire heater is foamed into the door
around the glass perimeter. This heater helps to minimize the formation of condensation on the glass and/or door
frame by energizing in ten (10) to forty (40) second ON/OFF cycles, depending on the compartment temperatures;
colder temperatures equal longer cycles. (See Figure 3-43).
To help minimize condensation
further, the microprocessor
detects when the refrigerator
door is opened, via the light
switch, and when the door clos-
es the evaporator fan is ener-
gized for five (5) minutes,
regardless of the refrigerator
compressor operational state,
drawing any warmer moist air
away from the door glass.
(See Figure 3-43)
Figure 3-43. Signal Trace Schematic: Glass Door Unit Door Heater &
Evaporator Fan Operation
3. Evaporator
fan energized
1. Power supplied to door heater in
10 - 40 second ON/OFF cycles at
all times. Cycle length depends on
compartment temperature. Colder
temperatures = longer time on.
2. Signal that ref. door
opened and closed
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