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Freezer Defrost Heater
The defrost heater is a 420-watt, single-tube, glass-
enclosed radiant heater. It is located at the bottom
of the evaporator between the rows of coils. It is
held in place by 2 tabs on the evaporator (1 on each
end plate), a ceramic and wire support, and a right-
side wire support.
The defrost heater has an approximate resistance
value of
32
Ω.
To remove the defrost heater:
1. Remove the freezer evaporator cover. (See
Freezer Evaporator Cover
Note
•
During defrost, the drain probe assists in
preventing the drain from icing closed. During
assembly, the probe must be installed on the
evaporator and inserted in the drain to prevent
drain freeze-up.
•
The ceramic and wire support prevents the
heater from sagging and touching the metal
drain trough if the glass is broken.
•
There is a drip shield located just above the
heater.
Note: The following procedures can be made easier
by loosening the 2 Phillips-head screws (1 on each
top corner of the evaporator) and tilting the bottom
of the evaporator out from the drain trough.
2. Remove the ceramic and wire support, right-
side wire support, and the drain probe from the
evaporator.
Ceramic and Wire Support
.)
Wire Support
Drain Probe
3. Bend the aluminum tabs back (located at each
end of the defrost heater) and lower the heater
from the evaporator.
4. Disconnect 2 lead wires and remove the heater.
Tab
Heater Lead Wire
(1 of 2)
Freezer Overtemperature Thermostat
The freezer overtemperature thermostat is
attached to the evaporator inlet tube with a metal
clip. The overtemperature thermostat will open its
contacts and de-energize the heater whenever the
evaporator temperature reaches approximately
140°F. The thermostat contacts will close at
approximately 110°F.
To access the freezer overtemperature thermostat
the freezer evaporator cover must be removed. (See
Freezer Evaporator Cover
Overtemperature
Thermostat
– 56 –
Defrost Heater
.)
Clip
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