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Page Title:
COMPRESSOR MOTOR BURN OUT INSPECTION |
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 TM 5-4120-393-14
5-28. Compressor (B1) (cont)
10. Carefully slide compressor from air conditioner.
11. Check the compressor to see if motor bum out is indicated.
COMPRESSOR MOTOR BURN OUT INSPECTION
WARNING
Avoid skin contact or inhaling fumes from any acid formed by burnout 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.
1.
After removal of a bad compressor from the refrigeration system, remove all external tubing and tip the compressor
toward the discharge port to drain sample of oil into a clear glass container.
2.
If the oil is clean and clear, and does not have a burnt acid smell, the compressor did not fail because of motor
burnout. If a burnout is not indicated, proceed to step INSTALL COMPRESSOR.
3.
If the oil is black, contains sludge, and has a burnt acid odor, the compressor failed because of motor burnout.
4.
You must clean the entire refrigeration system after a burnout has occurred, since contaminants will have been
carried to many corners and restrictions in the piping and fittings. These contaminants will soon mix with new
refrigerant gas and compressor oil to cause repeated burn outs.
5.
Remove the dehydrator. Connect a cylinder of dry nitrogen to each dehydrator connection in turn and open the
2
cylinder shutoff valve for at least 30 seconds at 50 psig (3.5 kg/cm ) pressure.
6.
Connect the two dehydrator fittings with a jumper locally manufactured from refrigerant tubing and fittings.
7.
Clean system by back flushing with liquid R-11 from pressurized cylinder or circulating pump and reservoir with
pressure of at least 100 psig.
8.
If pump is used, connect the discharge line of the refrigerant system to the discharge side of the pump.
9.
Connect a line containing a filter to the suction line in the unit.
NOTE
An unused dehydrator or other suitable medium may be used as a filter.
10. The other end of the temporary suction line should be connected to a small drum or suitable reservoir.
11. A line should be run from the bottom of the reservoir to the inlet of the pump.
WARNING
Avoid skin contact or inhaling fumes from any acid formed by burnout 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.
5-73
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