Service Manual

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16.9: Defrost
When defrosting (dEF), the user interface display will appear as seen below:
Defrost can be achieved either automatically or manually. A manual defrost can be activated by
holding the minus and lock keys simultaneously for a period of three seconds. Once defrost is
activated the Use Interface will flash “dEF” three times before showing an uninterrupted “dEF”.
More information is available in Section 5.
 Defrosting of the refrigerator freezer is unique from any of the Marvel and Marvel
Under counter products. The components are very similar to those in a domestic
full size refrigerator. The system includes a defrost heater, defrost thermistor, and a
defrost termination thermostat.
 The damper to the fresh food compartment will close during defrosts. This serves as
a dual purpose; it will concentrate more heat for clearing the evaporator while also
eliminating any residual heat transferring back to the fresh food compartment.
 The timer function is programed into the main control board.
o The defrost cycle is programmed to activate after 8 hours of compressor run
time.
o NOTE: In a 90°F ambient, a typical defrost time will average approximately
17 minutes from compressor off, to compressor on time.
16.9.1: Defrost Function
 The defrost cycle is activated by a timed event from the main control board. The
programmed event will last for a 25 minute maximum defrost duration.