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Section C - Electrical Components
Defrost Heater (Cont.)
14. Slide drain trough off evaporator.
15. Remove retainer clamp form bottom of evaporator holding heater in place.
16. Grab heater from bottom and pull free of evaporator. It's very snug so you'll
need to use a little force.
17. Replace with new defrost heater.
18. Re-assemble in reverse order.
ELECTRONIC CONTROL SYSTEM
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Freezer Temperature Control
An electronic thermostat regulates the temperature of the frozen food section. A
Negative Temperature Coefficient Thermistor monitors freezer compartment
temperature. Loads controlled atr the compressor, condenser fan and evaporator
fan motor enabling and speed. See Diagram A.
Fresh Food Temperature Control
An electronic thermostat regulates the temperature of the fresh food section. A
Negative Temperature Coefficient Thermistor monitors fresh food compartment
temperature. The damper motor (position) and evaporator fan motor enabling and
speed are controlled by the electronic control. See diagram A.
Defrost Heater
A 450 watt heating element (115 VAC) located in the evaporator assembly to melt
frost during the defrost cycle. The defrost heater is connected to the NO contact of
a relay. Defrost Heater operation is detected and internally monitored by the
microprocessor. See diagram A.
Damper Assembly
Motorized door (+12 VDC) located between the freezer
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section and the fresh food section of the refrigerator.
The door will open to a certain position when there are
refrigeration requirements in the fresh food section. The
damper motor, which positions the door, is a 12 VDC, 2
phase, bipolar stepper motor. See Diagram A.
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