Reversing Valve - Maytag Amana PMH Series Service And Troubleshooting

SERVICING
The generally accepted materials are:
• SIL-FOS (Alloy of 15% silver, 80% copper, 5% phos-
phorus) is used without flux on copper to copper. DO
NOT USE FOR A COPPER TO STEEL CONNECTION.
Recommended heat is approximately 1400°F.
• SILVER SOLDER (Alloy of 30% silver, 38% copper,
32% zinc.) Is used with fluoride base flux on copper
to steel, brass to copper, steel to steel, brass to steel.
Recommended heat is approximately 1200°F. This is
the most important part of the entire service procedure.
8. Braze coupling and cap tube into place.

Reversing Valve

Occasionally the reversing valve may stick in the heating or
cooling position or in the mid-operation.
When stuck in the mid-position, part of the discharge gas
from the compressor is directed back to the suction side
resulting in excessively high suction pressure.
Check the operation of the valve by starting the system and
switching the operation from COOLING to HEATING and
then back to COOLING.
If the valve fails to change its position, test the voltage
(230 V. or 265 V.) at the valve coil connector cap, while the
system is on the HEATING CYCLE.
If no voltage is registered to the coil, check the operation
of the reversing relay and the continuity of the connecting
wires.
If voltage is registered at the coil, tap the valve body lightly
while switching the system from HEATING to COOL-
ING etc. If this fails to cause the valve to switch position,
remove the coil connector cap and wiring and test the con-
tinuity of the valve coil. If the coil does not test continuous
replace it.
If the valve is inoperative, replace.
Sound Level
Noise complaints are frequently caused by a faulty instal-
lation or by the customer's lack of knowledge and informa-
tion. Sources of actual noise may be traced to operational
components, tubing vibration, or misalignment of case or
sleeve with chassis.
Component Replacement
Replacement of the compressor, evaporator, condenser,
capillary tubes and reversing valve must be in accordance
with accepted service practices. These procedures include
a complete evacuation of both high and low sides, and
changing of both strainer whenever the refrigerant system
is opened.
Before replacing a component in the sealed system,
make sure that the cause for complaint does not lie in the
electrical circuit, control, overload or is due to some other
reason. The serviceman must be familiar with the opera-
tional characteristics of the product and should not jump to
conclusions.
Front Cover
1. Remove the two screws securing the front to the chas-
sis.
NOTE: Not all installations will use these screws.
Front Mounting Screw
accessed
through louvers.
2. Grasp the cabinet front as shown.
3. Pull the bottom of the cabinet front away from the chas-
sis until the retaining clips disengage.
4. Lift the cabinet front off the chassis. Reverse this proce-
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