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The defrost cycle is pre-programed into the main power board and is not adjustable. The
factory default is 6 hours of accumulated run time and begins at the conclusion of the
compressor on cycle. The beginning of the next defrost cycle starts after time expires from the
previous defrost event.
15.12.1: Defrost Component Sequence
1. The heater cycles between on and off depending on the call for cooling load (unless
ambient temperature exceeds 85°F).
a. A call for cooling in the upper (warmer) compartment opens both damper doors
and disables the heater.
b. A call for heat in the upper (warmer) compartment closes both damper doors
and enables the heater.
2. The compressor shuts off at the initiation of the defrost cycle.
3. Both upper (Photo A) and lower (Photo B) compartment fans will be operative.
4. The rear damper is open from the heater section to the evaporator section (Photo C);
but closed to the top compartment to the heater (Photo D).
Upper
Lower
Damper Open
Damper Closed
Clockwise Rotation
Counter-Clockwise Rotation
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