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4.16
LCD Display Panel
The ice & water models are fitted with an LCD display on the exterior of the PC door. This is the user
interface. Refer to Section 5 for further details of the display interface.
4.17
Door Switches
"Reed" switches are used to detect the opening and closing of the doors. They are activated by two small
magnets that are built into the PC and FC doors. The reed switches are encapsulated within a plastic
housing, which is clipped under the plastic covers on the base and cross rails.
4.18
Defrost Heater
A heating element is used to defrost the ice accumulated on the evaporator. The defrost heating element
used on the evaporator is of an inconal folded type having both wiring terminations at one end. The defrosts
are adaptive to the usage and environment and are controlled by the power/control module and sensed by
the defrost sensor located on the evaporator chassis registering +8
element. 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 hours and 1
day. However it can be as short as 3 hours or as long as 70.8 hours depending on the usage and
environment.
Diagram 4.16
R134a Evaporator Defrost Element
R600a Evaporator Defrost Element
Diagram 4.18
31
O
C before terminating the defrost heater
321144
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