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TM 9-4120-389-14
WARNING
Avoid inhaling fumes and burns from acid formed by burn out of oil and refrigerant.
Wear a gas mask if area 'is not thoroughly ventilated. Wear protective goggles or
glasses to protect eyes. Wear rubber gloves to protect hands.
(12)
Fill reservoir with fluorocarbon refrigerant, R11, and start the pump. Continue filling the
reservoir with refrigerant, R-11, until it begins to pour out of the return line. Continue flushing for at least 15
minutes.
(13)
Reverse the pump connections, replace the filter with a new filtering medium, and backflush
the system for an additional 15 minutes.
(14)
Remove the pump, reservoir, filter, and dehydrator jumper. Place an empty container below
the compressor connections, and connect a cylinder of dry nitrogen to each filter-drier connection in turn. Blow
down each leg of the system at 50 psig (3.5 kb/cm2) for at least 30 seconds.
(15)
Disconnect the dry nitrogen cylinder. Cap or plug open connections if compressor and filter-
drier are not to be installed immediately.
i.
Compressor installation
CAUTION
The compressor is supplied with a complete charge of oil. Take care that oil is not
lost when handling and installing compressor.
NOTE
If any refrigeration piping was disconnected with the compressor being replaced,
transfer the piping to the replacement compressor before installing it in the air
conditioner.
(1)
Lift the compressor and place in unit.
(2)
Align four feet of compressor with four mounting cap screws, four resilient mounts and four
spacers.
(3)
Install four flat washers and lock nuts on four cap screws.
(4)
Wrap wet rags or heat sink (Item 28, Appendix B) around compressor and other tube joints
removed during disassembly.
(5)
Purge the system with nitrogen (See para. 5-4).
5-74
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