Reversing Valve - Maytag Amana PTH153K50 Series Service And Troubleshooting

SERVICING
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 condenser 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.
The generally accepted materials are:
• SIL-FOS (Alloy of 15% silver, 80% copper, 5%
phosphorus) 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.
7. 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
COOLING etc. If this fails to cause the valve to switch
position, remove the coil connector cap and wiring and
test the continuity 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
installation or by the customer's lack of knowledge and
information. 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
operational characteristics of the product and should not
jump to conclusions.
FRONT COVER
1. Remove the two screws securing the front to the
chassis.
NOTE: Not all installations will use these screws.
2. Grasp the cabinet front as shown.
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