Amana APG1624060M41, Руководство по установке

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15
SERVICE
THE FOLLOWING INFORMATION IS FOR USE BY QUALIFIED SERVICE AGENCY ONLY: OTHERS SHOULD NOT ATTEMPT TO
SERVICE THIS EQUIPMENT.
C
OMMON
C
AUSES OF
U
NSATISFACTORY
O
PERATION OF
H
EAT
P
UMP ON THE
H
EATING
C
YCLE
I
NADEQUATE
A
IR
V
OLUME
T
HROUGH
I
NDOOR
C
OIL
When a heat pump is in the heating cycle, the indoor coil is functioning 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
UTSIDE
A
IR INTO
R
ETURN
D
UCT
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 cycling resulting
in low heating output. It may also cause false defrosting.
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
OOR
“T
ERMINATING
” S
ENSOR CONTACT
The unit’s defrost terminating sensor must make good thermal contact with the outdoor coil tubing. Poor contact may not terminate the
unit’s defrost cycle quickly enough to prevent the unit from cutting out on high discharge pressure.
M
ALFUNCTIONING
R
EVERSING
V
ALVE
- T
HIS MAY BE DUE TO
:
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 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.