Whirlpool WGPH45 AM Installation Manual download pdf (Page 16)

Refrigerant Charge Check—Units with Fixed

Orifice Devices

After completing the airflow measurements and adjustments, the

unit’s refrigerant charge must be checked. The unit comes

factory-charged, but this charge is based on 325 CFM per ton

and a minimum ESP per ARI test conditions (generally between

0.15 to 0.25 ESP). When air quantity or ESP is different than

above, the refrigerant charge must be adjusted to the proper

amount.

All package units with fixed orifice devices are charged using the

superheat method at the compressor suction line.

For charging in the warmer months, 8ºF ± 3ºF superheat at the

compressor is required at conditions 95ºF (35ºC) outdoor

ambient (dry bulb) temperature, 80ºF (27ºC) dry bulb/67ºF (19ºC)

wet bulb indoor ambient, approximately 50% humidity. This

superheat varies when conditions vary from the conditions

described.

After superheat is adjusted, it is recommended that the

subcooling be checked at the condenser coil liquid line out. In

most operating conditions, 10ºF to 15ºF of sub-cooling is

adequate.

SYSTEM MAINTENANCE

The self-contained package air conditioner or 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 System Troubleshooting chart should help in

identifying problems if the unit does not operate properly.

Service

NOTE: The following information is for use by qualified service

agency only. Others should not attempt to service this

equipment.

Common Causes of Unsatisfactory Operation of Heat

Pump on the Heating Cycle.

■ Inadequate Air Volume Through Indoor Coil

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 cutout.

■ 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 (18ºC). 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.

■ Undercharge

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.

■ Poor “Terminating” Sensor Contact

The defrost terminating sensor must make good thermal

contact with the outdoor coil tubing. Poor contact may not

terminate the 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 the solenoid—Check unit voltage. If no

voltage, check wiring circuit.

3. Valve will not shift—If the unit is undercharged, check for

leaks. If valve body damaged, replace valve. If unit is

properly charged, and 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.

NOTE: 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, turn off

the unit and wait until the discharge and suction pressure

equalize, and repeat above steps. If the valve does not

shift, replace it.

Goodman 6

HIGH VOLTAGE!

WARNING

Disconnect ALL power before servicing.

Multiple power sources may be present.

Failure to do so may cause property damage,

personal injury or death.

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Whirlpool WGPH45 AM Installation Manual Page 16

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