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 TM 55-1905-219-14-9
4-37. REFRIGERATOR/FREEZER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
8.
Relay (14 The relay has a magnetic coil which activates a movable
and 15) contact, and completes the circuit through the starting
winding in the motor. When the motor reaches a pre-
determined speed, the magnetic coil releases the
movable contact, which disconnects the motor starting
windings from the electrical circuit. The motor
running windings remain in the circuit at all times.
9.
Conden-
The condensing motors are hermetic sealed in a air
sing
tight welded dome. The pistons are partially submerged
motors
in oil, therefore no parts require lubrication. If
(16 and
condensing motors do not operate, replace with new
17)
units .
10.
Capil-
The capillary acts as the liquid line and metering
lary
device. The capillary meters refrigerant into the
(18)
evaporator from the condensing motor. The capillary is
a seamless copper tubing soldered to the suction line
for approximately 18 inches and acts as a heat inter-
changer. The heat interchanger pre-cools the refriger-
ant going to the evaporator and warms the refrigerant
going back to the compressor, the capillary serves a
dual purpose. The capillary length and bore are
adjusted to pass the required amount of liquid under
the normal differences of operating pressures.
11.
Dehydra-
tor and
strainer
(19)
CAUTION
The dehydrator MUST be replaced if refrigerant lines are
disconnected for servicing. The silicon-gel, when exposed,
absorbs a maximum amount of moisture.
a. The dehydrator and strainer (19) are attached to
the capillary (18).
b. The purpose of the strainer is to keep the refriger-
ant clean of dirt and particles that may be in the
system. When repairing the refrigerant lines,
and the lines are disconnected replace the strainer.
4-1000
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