Maintenance; Service; Common Causes Of Unsatisfactory Operation Of Heat Pump On The Heating Cycle; Inadequate Air Volume Through Indoor Coil - Goodman PC Installation Instructions Manual

MAINTENANCE

The Self Contained Package Air Conditioner and Heat Pump
should operate for many years without excessive service calls
if the unit is installed properly. However it is recommended
that the homeowner inspect the unit before a seasonal start
up. The coils should be free of debris so adequate air flow is
achieved. The return and supply registers should be free of
any obstructions. The filters should be cleaned or replaced.
These few steps will help to keep the product up time to a
maximum. The Troubleshooting Chart (see Appendix) should
help in identifying problems if the unit does not operate
properly.
Refer to Blower Performance section in the Appendix - Higher
air flow lowers temperature rise.
Lower air flow raises temperature rise.

SERVICE

THE FOLLOWING INFORMATION IS FOR USE BY
QUALIFIED SERVICE AGENCY ONLY: OTHERS SHOULD
NOT ATTEMPT TO SERVICE THIS EQUIPMENT.
C C U
OMMON AUSES OF NSATISFACTORY
P H C
UMP ON THE EATING YCLE
I A V T
NADEQUATE IR OLUME
When a heat pump is in the heating cycle, the indoor coil is func-
tioning as a condenser. The return air filter must always be clean,
and sufficient air volume must pass through the indoor coil to
prevent excessive discharge pressure, and high pressure cut out.
O
PERATION OF
I C
HROUGH NDOOR OIL
O A
UTSIDE IR INTO
Do not introduce cold outside air into the return duct of a heat
pump installation. Do not allow air entering the indoor coil to drop
below 65°F. Air below this temperature will cause low discharge
pressure, thus low suction pressure, and excessive defrost cy-
cling resulting in low heating output. It may also cause false de-
frosting.
U
NDERCHARGE
An undercharged heat pump on the heating cycle will cause low
discharge pressure resulting in low suction pressure and frost
accumulation on the outdoor coil.
P "T
OOR ERMINATING
The unit's defrost terminating sensor must make good thermal
contact with the outdoor coil tubing. Poor contact may not termi-
nate the unit's defrost cycle quickly enough to prevent the unit from
cutting out on high discharge pressure.
M
ALFUNCTIONING
1. Solenoid not energized - In order to determine if the
solenoid is energized, touch the nut that holds the solenoid
cover in place with a screwdriver. If the nut magnetically
holds the screwdriver, the solenoid is energized and the
unit is in the cooling cycle.
2. No voltage at unit's solenoid - Check unit voltage. If no
voltage, check wiring circuit.
3. Valve will not shift:
a. Undercharged - check for leaks;
b. Valve Body Damaged - Replace valve;
c. Unit Properly Charged - If it is on the heating cycle,
raise the discharge pressure by restricting air flow
through the indoor coil. If the valve does not shift, tap it
H
EAT
lightly on both ends with a screwdriver handle. DO NOT
TAP THE VALVE BODY. If the unit is on the cooling cycle,
raise the discharge pressure by restricting air flow
through the outdoor coil. If the valve does not shift after
the above attempts, cut the unit off and wait until the
discharge and suction pressure equalize, and repeat
above steps. If the valve does not shift, replace it.
15
R D
ETURN UCT
" S
ENSOR CONTACT
R V - T
EVERSING ALVE HIS MAY BE DUE TO
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