TM 9-4120-370-14
TO 35E9-229-1
5-20. COMPRESSOR (B1) - Continued.
h. Compressor motor burn out
After removal of a bad compressor from the refrigeration system, remove all external tubing and tip the
(1)
compressor toward the discharge port to drain sample of oil into a clear glass container.
Avoid skin contact or inhaling fumes from any acid formed by burn out of oil and
refrigerant.
If the oil is clean and clear, and does not have a burnt acid smell, the compressor did not fail because of
(2)
motor burn out. If a burn out IS not Indicated, proceed to i.
If the oil is black, contains sludge. and has a burnt acid odor, the compressor failed because of motor burn
(3)
out.
(4)
You must clean the entire refrigeration system after a burn out 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.
Remove the filterdrier, and blow down each leg of the refrigeration system, To do this. connect a cylinder
(5)
of dry nitrogen to each filter-drier connection in turn, and open the cylinder shutoff valve for at least 30
seconds at 50 psig (3.5 kg/cm2) pressure.
Connect the two filterdrier fittings with a jumper, locally manufactured from refrigerant tubing and fittings.
(6)
(7)
Clean system by backflushing with liquid R11 (item 11, Appendix E) from pressurized cylinder orcirculat-
ing pump and reservoir with pressure of at least 100 psig.
If pump is used, connect the discharge Ilne of the refrigerant system to the discharge side of pump.
(8)
Connect a line containing a filter to the suction line in the unit.
(9)
NOTE
An unused filterdrier 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.
Avoid skin contact or inhaling fumes from any 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 re-
frigerant, R11, 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 filter-drier jumper. Place an empty container below the compressor
connections, and connect a cylinder of dry nitrogen to each filterdrier connection in turn. Blow down each
leg of the system at 50 psig (3.5 kg/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.
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