TM 9-4120-360-14
a. Maneuver the crankcase heating element over the top of the compressor, and down to the lower part of the
compressor housing. Do not spread the ends of the heating element any more than necessary. Install retaining spring (7)
over both ends of the heating element (6) to hold it in position.
b. Lead electrical wires from heating element (6) into the compressor junction box (3). Slide a one-inch length
of heat-shrink tubing over one wire lead, and solder wire to pin G of receptacle (2). Slide heat-shrink tubing over
connection, and heat with a match to shrink in place. Splice the other heater lead to the thermostat lead and insulate as
necessary.
c. Install the receptacle (2) in the junction box (3), using four screws to secure. Install cover (4) on junction box.
Connect wiring harness to receptacle (2).
Remove the compressor from the air conditioner in accordance with the following procedure.
a. System Discharge. Before removing any refrigeration component from the air conditioner, all refrigerant gas
must be discharged from the system. Proceed as follows:
(1) Remove five screws from the frame of the fresh air screen in the upper right-hand corner of the rear
surface of the air conditioner. Remove the fresh air screen to obtain access to the suction and discharge service valves.
WARNING
Use great care to avoid contact with liquid refrigerant or refrigerant gas being discharged from any
container under pressure. Sudden arid irreversible tissue damage can result from freezing. Wear
thermal protective gloves and a face protector in any situation where skin- or eye-contact is possible.
Prevent contact of refrigerant gas with flame or hot metal surfaces. Heat causes the refrigerant to
break down and form carbonyl chloride (phosgene), a highly toxic and corrosive gas.
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NOTE
In accordance with Environmental Protection Agency regulations, refrigerants cannot be discharged into
the atmosphere. A refrigerant recovery and recycling unit must be used whenever discharging the system.
Operation of the recovery/recycling unit must be by AUTHORIZED PERSONNEL ONLY.
(3) Connect and operate a recovery/recycling unit in accordance with manufacturer's instructions.
NOTE
Dry nitrogen is always used to purge the refrigeration system before brazing or debrazing connections, in
order to prevent internal oxidation and scaling.
b. Debrazing. Connect a cylinder of dry nitrogen to the gauge port of the discharge service valve. Open the
cylinder shutoff valve and the discharge service valve slightly, and completely open the suction service valve to purge the
system of refrigerant gas. Use 1-2 cfm (0.1-0.2 M/minute). With dry nitrogen flowing through the system, debraze
tubing connections at any fitting near the compressor that will permit convenient removal. Tubing and fittings attached to
the compressor after its removal can be transferred to the replacement compressor before installation in the air
conditioner.
c. Dismounting the Compressor.
CAUTION
When hoisting the air conditioner by means of a sling through the handles, use a spreader bar to pre-
vent the sling damaging the casing.
(1) Hoist the air conditioner onto support blocks of sufficient height to permit insertion of a socket wrench
through the compressor mounting holes in the base plate.
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