GPCH3 Installation Manual
7
Single Phase - Two leads should be connected to terminals
L1 & L2 in the electrical control section, using wire sizes
a. Air Conditioners - Connect 24V wires from the
thermostat to the corresponding wires in the
control box using No. 18AWG as follows:
Red
Green
Yellow
White
b. Heat Pumps - Connect 24V wires from the
thermostat to the corresponding wires in the
control box using No. 18AWG as follows:
Red
Green
Orange
White
Yellow
A diagram detailing the internal wiring of this unit is located
on the electrical box cover. If any of the original wire supplied
with the appliance must be replaced, the wire gauge and
insulation must be the same as the original wiring.
Transformer is wired for 230 volts on the 208 / 230 models.
See wiring diagram for 208 volt wiring.
15 20 25 30 35 40 45 50
SUPPLY WIRE LENGTH -
FEET
200 6 4 4 4 3 3 2 2
150 8 6 6 4 4 4 3 3
100 10 8 8 6 6 6 4 4
50 14 12 10 10 8 8 6 6
1.
the run can be determined from Table 4 using the
circuit ampacity found on the unit rating plate. From
the unit disconnect to unit, the smallest wire size
allowable in Table 4 may be used for the ampacity, as
the Disconnect must be in sight of the unit.
2. Wire size based on 60° C rated wire insulation and
3. For more than 3 conductors in a raceway or cable,
see the N.E.C. for derating the ampacity of each
conductor.
1. Turn thermostat system switch to “Cool,” and fan
switch to “Auto” and turn temperature setting as high
as it will go.
2. Inspect all registers and set them to the normal open
position.
3. Turn on the electrical supply at the disconnect.
4. Turn the fan switch to the “ON” position. The blower
should operate after a 10 second delay.
5. Turn the fan switch to “Auto” position. The blower
should stop after a 60 second delay.
6. Slowly lower the cooling temperature until the unit
starts. The compressor, blower and fan should now be
operating. Allow the unit to run 10 minutes, make sure
cool air is being supplied by the unit.
7. Turn the temperature setting to the highest position,
stopping the unit. The indoor blower will continue to
run for 60 seconds.
8. Turn the thermostat system switch to “OFF” and
disconnect all power when servicing the unit.