24
Photo 6.1.5.4
6.1.6 Defrost Heater
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
o
C (46
o
F) before terminating the defrost heater element. Previous defrost history, the
number of door openings, and the compressor percentage 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.
DEFROST ELEMENT
Diagram 6.1.6
High voltage
test point
Signal circuit
test point
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