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 TM 55-1905-219-14-9
4-37. REFRIGERATOR/FREEZER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
i.
Pressure
Replace or repair.
As required.
control
(9)
6. Evapor-
The evaporators are a forced air circulation coil and
ators
fan. The coil is installed facing the rear of the
(10 and
refrigerator or freezer, so the suction fan constantly
11)
pulls warmer air over the coil and recirculates the air
in an undisturbed cycle. The fan has a 1/20 hp 115v
motor.
7. Overload
protector
(12 and
13 )
WARNING
Before replacing overload protector, disconnect the power
supply to the unit. Remove leads from terminals, remove
protector, install new .(like) protector and reconnect leads.
The overload protector, and the starting relay, are attached to a
bracket which is welded to the compressor shell, with a metal
cover. The motor overload protector is a small round plastic
casing which has a heater coil (A) and a bi-metallic metal strip
(B) inside. The heater coil is designed to carry normal start and
run current. If the current increases abnormally for any reason,
then the heater coil gives off excessive heat, which in turn,
causes the bi-metallic disc to snap open, which breaks the
electrical circuit and the motor stops. Also, if the compressor
shell gets too hot, the bi-metallic disc snaps open, breaking the
circuit, stop- ping the motor and protecting the motor from
excessive heat and/or current. When the temperature cools
down, the bi-metallic disc snaps closed, and starts the motor. If
the motor overload protector fails to operate properly, it must be
replaced.
4-998
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