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 TM 54120-341-13
ACTION
REMARKS
LOCATION/lTEM
TOP OF HOUSING
a.
Connect suction and discharge pressure guages
7. Compressor
to the suction and discharge service valves.
b.
Open suction and discharge service valves.
c.
Operate the air conditioner in the cooling
mode and verify that the normal operating
pressures are as follows:
Normal Operating Pressures
Suction Pressure
Discharge Pressure
Suction Pressure
Discharge Pressure
d.
Stop air conditioner,
e.
Close suction and discharge service valves.
f.
Remove guages.
Operate the air conditioner in the cooling
9.
mode and using a multimeter, measure the
insuIation resistance of the compressor
internal motor windings at the start relay and
selector switch.
h.
Verify that the insulation resistance between
the windings and compressor frame is NOT
less than 60 megohms.
i.
Verify that the insulation resistance of the
m a i n winding (terminal pin A to C) is
between .6 and .8 ohms.
Verify that the insulation resistance of the
j.
auxiliary winding (terminal pin A to B) is
between 5 and 7 ohms.
k.
If testing indicates that the compressor is
defective, remove or repair compressor.
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