Reversing Valve; Sound Level; Component Replacement; Front Cover - Amana PTAC Service Instructions Manual

SERVICING
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
WARNING
BRAZING REQUIRES HIGH TEMPERATURES. TAKE
PRECAUTION TO PROTECT AGAINST PERSONAL
INJURY OR PROPERTY DAMAGE.
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% phos-
phorus) is used without flux on copper to copper. DO
NOT USE FOR A COPPER TO STEEL CONNECTION. Rec-
ommended 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 proce-
dure.
8. Braze coupling and cap tube into place.
WARNING
S-122 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.
56
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.
WARNING
SET THE THERMOSTAT ALL THE WAY COUNTER-
CLOCKWISE TO PREVENT THE FAN FROM
SUDDENLY COMING ON AND ENDANGERING
THE SERVICER'S HANDS.
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 installa-
tion 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, cap-
illary tubes and reversing valve must be in accordance with
accepted service practices. These procedures include a com-
plete 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 electri-
cal circuit, control, overload or is due to some other rea-
son. The serviceman must be familiar with the operational
characteristics of the product and should not jump to con-
clusions.

FRONT COVER

1. Remove the two screws securing the front to the chas-
sis.
NOTE: Not all installations will use these screws.