– 59 –
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• Following pre-chill, the heated freezer and heated
fresh food defrost cycle is initiated where both
heaters will be on at the same time.
• The 3-way valve will move to the A position. The
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• The freezer defrost heater remains on until the
freezer
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temperature) or the maximum defrost time of 45
minutes is reached.
• The fresh food defrost heater remains on until the
fresh food
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temperature) or the maximum defrost time of 45
minutes is reached.
• If either the fresh food or freezer defrost
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ON time exceeds the normal defrost threshold
of approximately 20 minutes, the defrost is
considered abnormal. Abnormal defrost forces
both the fresh food and freezer into pre-chill after
6 hours of compressor run time (door openings
not counted).
• During defrost, if power is interrupted, the
refrigerator will restart in the dwell state if the
freezer
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(defrost termination temperature).
•
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will enter the dwell cycle.
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•
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unit will enter the dwell cycle.
• During the dwell cycle, the compressor and fans
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3-way valve will move to the
A position (both fresh food and freezer open) and
remain there for the entire cycle.
• The dwell cycle will terminate after 7 minutes.
• At the end of the dwell cycle, the compressor run
timer for adaptive defrost is reset to 0 hours and
the refrigerator enters the post-dwell cycle.
• If power is interrupted during the dwell cycle and
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freezer defrost termination temperature), the
dwell cycle will start over.
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• Upon completion of the dwell cycle, the unit will
enter the post-dwell cycle.
• The 3-way valve will move to either the A or B
position, depending upon whether the fresh food
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• The compressor and condenser fan will start, but
the fresh food fan, freezer fan, and ice box fan
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• Post-dwell cycle will end when the freezer and
fresh food evaporators reach the post dwell exit
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minutes has expired.
• Upon exit of post-dwell cycle, the control system
will now operate all cooling components by its
logic, and restarts the compressor run timer for
adaptive defrost.
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Models operate as follows:
• Pull Down occurs when the refrigerator is
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• Cooling operation is the normal cycling of
temperatures whether the last defrost was
normal or abnormal.
• Fresh food cycle defrost occurs when the 3-way
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evaporator, but the freezer continues to cool.
• Pre-chill occurs before the freezer heated defrost.
• Fresh food defrosts occur 32, 64, and 96 hours
from the previous freezer and fresh food heated
defrost.
• Freezer heated defrost occurs every 96 hours of
compressor run time.
• Dwell occurs after every heated defrost cycle.
• Post Dwell occurs after every dwell cycle.
