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TM5-4120-387-14
(11) Carefully slide compressor from air conditioner.
(12) Check the compressor to see if a motor burnout is indicated
e.
Compressor motor burnout.
(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.
Avoid inhaling fumes and burns 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.
(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 indi-
cated, proceed to f.
(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 restric–
tions in the piping and fittings.
These contaminants will soon mix with new
refrigerant gas and compressor oil to cause repeated burnouts.
(5) Remove the dehydrator (filter-drier), and blow down each leg of the
refrigeration system.
To do this, connect a cylinder of dry nitrogen to each
dehydrator connection, in turn, and open the cylinder shutoff valve for at least
30 seconds at 50 psig (3.5 kg/cm2) pressure.
(6) Connect the two dehydrator fittings with a jumper, locally manu-
factured from refrigerant tubing and fittings.
(7) Clean system by back-flushing with liquid R-11 (item 12, Appendix E)
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 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.
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