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5.2
Defrost Cycle
A heating element is used to defrost the ice accumulated on the evaporator. The defrosts are adaptive to
the usage and environment and are controlled by the power/control module. During a defrost, the
temperature above the evaporator is sensed by the defrost sensor located on the evaporator chassis. This
sensor must register +8
register a temperature of +8
defrost will be terminated. If two successive defrost attempts fail to reach this temperature, a fault code is
displayed (refer Section 6.2.1). Previous defrost history, the number of door openings, and the compressor
run time are used to determine the interval between defrosting. The typical time interval for defrosts is
between 12 and 24 hours. However, it can be as short as 5 hours or as long as 96 hours depending on the
usage and environment.
NOTE: The defrost cycle will not start if the defrost sensor is above +8°C (46
The defrost cycle follows a predefined sequence:
There is a delay of 2 minutes before the element starts to heat (commonly known as evaporator
warm up time).
The defrost element will remain on until the defrost sensor has reached +8
The compressor will remain off for a further 4 minutes (commonly known as drip time).
The compressor will restart, and a further 30 seconds later both fans will restart.
The following table outlines the defrost cycle of an Active Smart refrigerator.
o
o
C (46
F) before terminating the defrost heater element. If the sensor does not
o
o
C (46
F) within 30 minutes of the commencement of the defrost cycle, the
Diagram 5.2
13
o
F).
o
o
C (46
F).
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