GPCH3 Installation Manual
6
A suitable plenum or square duct must be constructed. The
duct cross-sectional area should be determined by industry
duct sizing manuals or air duct calculators.
On ductwork exposed to outside air conditions of temperature
and humidity, use an insulation with a good K factor, and
a vapor barrier. Industry practices should be followed.
duct in the supply system. Ductwork should be properly
supported from the unit.
Filters are not provided with unit, and must be supplied
and installed in the return duct system by the installer.
cleaning. Filters must have adequate face area for the rated
The condensate drain connection of the evaporator is a
half coupling of ¾” N.P.T. A trap must be provided to have
Proper condensate drainage.
2" Minimum
3" Minimum
A Positive Liquid Seal
Is Required
Flexible
Tubing-Hose
Or Pipe
Drain
Connection
Unit
Install condensate drain trap as shown. Use ¾” drain
connection size or larger. Do not operate without trap. Unit
must be level or slightly inclined toward drain.
All wiring should be made in accordance with the National
Electrical Code. The local Power Company should be
operate the unit. The voltage, frequency, and phase at the
power supply should be checked to make sure it corresponds
to the unit’s RATED VOLTAGE REQUIREMENT.
Install a branch circuit fused disconnect near the unit, in
accordance with the N.E.C. or local codes. Wire sizes and
overcurrent protection should be determined from the unit
or the N.E.C. Under no circumstances should wiring be sized
smaller than is recommended by either of these two sources.
Fuses smaller than that recommended on the wiring
diagrams could result in unnecessary fuse failure or
service calls. The use of protective devices of larger size
than indicated could result in extensive damage to the
equipment. The manufacturer bears no responsibility for
damage caused to equipment as result of the use of larger
than is recommended size protective devices.
All units have undergone a run test prior to packaging for
shipment. This equipment has been started at minimum
rated voltage and checked for satisfactory operation. Do not
attempt to operate this unit if the voltage is not within the
minimum and maximum voltages shown on nameplate.
All exterior wiring must be within approved weatherproof
conduit. The unit must be in
accordance with local codes, or in absence of local codes,
with N.E.C ANSI/ NFPA NO. 70-1984 or latest edition by
using ground lug in the control box.
R
W
G
G
R W
To wire the unit, make the following high and low voltage
connections.