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TM 9-4120-367-14
TM 07592B-14/1
6.9 COMPRESSOR. - Continued
Location/Item
Diagnosing
Compressor
Motor Burnout
- Continued
Cleanup
Procedures
Action
(8)
(9)
NOTE
Before checking the compressor mo-
tor, make sure the compressor and
crankcase heater are cool to the
touch. Otherwise, a false indication
may be obtained due to internal mo-
tor protectors being open.
Check the compressor motor to see if it is
electrically grounded or open.
A 500-volt megger or an ohmmeter can be
g.
h.
a.
b.
c.
d.
e.
used for making the test.
(10) Megger reading is at least 5 megohms.
After removal of a bad compressor from the re-
frigeration system, remove all external tubing and
tip the compressor toward the discharge port to
drain a small quantity of oil into a clear glass con-
tainer.
If the oil is clean and clear, and does not have an
acrid smell, the compressor did not fail because
of motor burnout.
If the oil is black, contains sludge and has an
acrid odor, the compressor failed because of mo-
tor burnout.
If a burnout has occurred, the refrigeration sys-
tem must be cleaned to prevent residual contami-
nants from causing repeated burnouts.
System must be cleaned thoroughly to remove all
contaminants.
Discharge refrigerant from system.
Nitrogen purge both high and low sides of sys-
tem.
Remove and install new drier/filter.
Install new drier/filter in suction line.
Install “pressure tap” (valve) between bulbwell
and suction line drier/filter.
Remarks
If not, a repeat burnout will oc-
cur.
Paragraph 6.4. Wear rubber
gloves.
Paragraph 6.5
Paragraph 6.15
Use same drier/filter as used
in system.
6-31
f.
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