Overload; Checking Compressor Efficiency; Filter Drier Replacement - Maytag Amana PMH Series Service And Troubleshooting

SERVICING
2. Carefully apply line voltage.
A. If the compressor starts and continues run, the cause
for failure is somewhere else in the system.
B. If the motor fails to start - replace.
Since all single phase compressors are of the permanent
split capacitor design the high and low side pressure must
be approximately equal or the low torque compressor may
not start.

Overload

Each compressor is equipped with an internal overload.
The line break internal overload senses both motor amper-
age and winding temperature. High motor temperature or
amperage heats the disc causing it to open, breaking the
common circuit within the compressor.
Fuse, circuit breaker, ground fault protective device, etc.
has not tripped.
1. With no power to the unit, remove the compressor cov-
er, and overload lead from the compressor terminal.
2. Using an ohmmeter: Test continuity between terminals
of the overload. If not continuous, the overload is open,
replace the overload.

Checking Compressor Efficiency

The reason for compressor inefficiency is broken or dam-
aged suction and/or discharge valves, or scroll flanks on
Scroll compressors, reducing the ability of the compressor
to pump refrigerant vapor.
The condition of the valves or scroll flanks is checked in the
following manner.
1. Attach gauges to the high and low side of the system.
2. Start the system and run a "Cooling Performance Test.
If the test shows:
A. Below normal high side pressure.
B. Above normal low side pressure.
C. Low temperature difference across coil.
B. Low amp draw at compressor.
and the charge is correct. The compressor is faulty - re-
place the compressor. NOTE: THIS TEST CANNOT BE
DONE IN THE HEATING MODE.

Filter Drier Replacement

1. Remove the two screws securing the front. Not all instal-
lations have the screws. Then remove the front. Do this
by pulling the bottom corners out and lifting up.
Front Mounting Screw
accessed
through louvers.
2. Remove the six screws securing the unit to the wall
sleeve. If screws are not present they should be in-
stalled when units is reinstalled.
3. Pull unit from wall sleeve and take unit to adequate work
area. Taking care not to spill any condensate which may
still be in the basepan.
IMPORTANT NOTE: Effective July 1,1992. Before
opening any refrigerant system it is the responsibility of
the service technician to capture the refrigerant for safe
disposal.
4. After all the refrigerant has been recovered from the
system, remove bottom of strainer by unbrazing the
strainer from the condenser elbow. Hold the strainer
with a pair of pliers while heating up the brazed joint
with a torch. When joint is hot pull up on strainer and
remove.
Heat up Capillary tube and remove from line.
5. To install the new filter drier assembly, remove the end
plugs and clean the ends to be brazed into place.
6. Clean the end of the capillary tube and insert into the
tube, it may be necessary to crimp tubing around the
capillary tube, being careful not to damage the capillary
tube. Insert the bottom of the filter drier into the con-
denser elbow, it may be necessary to heat slightly to
get coupling to go into place.
Brazing
Satisfactory results require cleanliness, experience and the
use of proper material and equipment.
The connections to be brazed must be properly sized, free
of rough edges and clean.
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