Maintenance; Service; Inadequate Air Volume Through Indoor Coil; Outside Air Into Return Duct - Daikin DP5HH2441 Series Installation Instructions Manual

DP5HH (24-60) Models (0 - 0.5 E.S.P.)
Unit Model Number
DP5HH2441**
DP5HH3041**
DP5HH3641**
DP5HH4241**
DP5HH4841**
DP5HH6041**
DP5HH (24-60) Models (0.5 - 0.8 E.S.P.)
Unit Model Number
DP5HH2441**
DP5HH3041**
DP5HH3641**
DP5HH4241**
DP5HH4841**
DP5HH6041**
T1 - Fan Only; T2 - Normal Speed Cooling
T3 - Normal Speed Heating
T4 - High Speed Cooling; T5 - High Speed Heating
Table 7A & 7B

MAINTENANCE

HIGH VOLTAGE!
Disconnect all power before servicing or in-
stalling this unit. Multiple power sources may
be present. Failure to do so may cause proper-
ty damage, personal injury or death.
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 airflow 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 (on page 16) should help in
identifying problems if the unit does not operate properly.

SERVICE

THE FOLLOWING INFORMATION IS FOR USE BY
QUALIFIED SERVICE AGENCY ONLY: OTHERS
SHOULD NOT ATTEMPT TO SERVICE THIS
EQUIPMENT.
Electric Heat KW
5 8 10 15
T3 T3 T3 T5
T3 T3 T3 T5
T3 T3 T3 T5
T3 T3 T3 T3
T3 T3 T3 T3
T3 T3 T3 T3
Electric Heat KW
5 8 10 15
T5 T5 T5 T5
T5 T5 T5 T5
T5 T5 T5 T5
T5 T5 T5 T5
T5 T5 T5 T5
T5 T5 T5 T5
WARNING
Common Causes of Unsatisfactory Operation of Heat
Pump on the Heating Cycle.
20

Inadequate Air Volume Through Indoor Coil

NA
When a heat pump is in the heating cycle, the indoor coil
NA
is functioning as a condenser. The return air filter must
NA
always be clean, and sufficient air volume must pass
through the indoor coil to prevent excessive discharge
T5
pressure, and high pressure cut out.
T3
T3

Outside Air Into Return Duct

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
20
cause low discharge pressure, thus low suction pressure,
NA
and excessive defrost cycling resulting in low heating
NA
output. It may also cause false defrosting.
NA

Undercharge

NA
An undercharged heat pump on the heating cycle will
NA
cause low discharge pressure resulting in low suction
NA
pressure and frost accumulation on the outdoor coil.

Poor "Terminating" Sensor 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.

Malfunctioning Reversing Valve

This 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 airflow 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
airflow 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.
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