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NOTE:

NOT

adjust charge based on suction pressure unless there is a gross

undercharge.

4. Disconnect manifold set. Installation is complete.

TWO

SPEED APPLICATION (GPH1648 / GPC1560)

Run the unit on low stage cooling for 10 minutes until refrigerant pressures stabi-
lize. Follow the guidelines and methods below to check unit operation and ensure
that the refrigerant charge is within limits. Charge the unit on low stage.

1. Purge gauge lines. Connect service gauge manifold to access fittings. Run

system at least 10 minutes to allow pressure to stabilize.

2. Temporarily install thermometer on liquid (small) line near liquid line access

fitting with adequate contact and insulate for best possible reading.

3. Check subcooling and superheat. Two stage systems running on low stage

with TXV application should have a subcooling and superheat within the
range listed on the chart.

a. If subcooling and superheat are low,

adjust

TXV superheat, then check

subcooling.

NOTE:

To adjust superheat, turn the valve stem clockwise to increase and

counter clockwise to decrease.

b. If subcooling is low and superheat is high,

add

charge to raise subcooling

then check superheat.

c. If subcooling and superheat are high,

adjust

TXV valve superheat, then

check subcooling.

d. If subcooling is high and superheat is low,

adjust

TXV valve superheat and

remove

charge to lower the subcooling.

NOTE:

NOT

adjust the charge based on suction pressure unless there is

a gross undercharge.

4. Disconnect manifold set, installation is complete.

ELECTRIC HEAT INSTALLATION & ADJUSTMENT

This series of electric cooling and heat pump package
equipment is designed to accept a field installed electric heat
kit. The unit is equipped to easily install the HKR/HKP Series
Electric Heat Kit. Full Installation Instructions are included
in this kit. Please use this document for guidance in field
equipping the package unit with electric heat.
Choose the heat kit that fits the application for the specific
installation. Permanently mark the unit’s nameplate with the
model being installed. High and low voltage connections are
detailed in the heat kit instructions.
Indoor Blower motor speed tap selection may need to be
modified to accommodate normal continuous operation to
prevent a nuisance trip.

See tables at right.

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 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.

TABLE 7A & 7B

TABLE 6A & 6B

Model #

Superheat

± 2°F

Subcooling

± 2°F

GPC1524H41 6

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GPC1530H41 8°

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GPC1536H41 12°