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ELECTRICAL WIRING
To avoid property damage or personal injury due to fire, use
only copper conductors.
NOTE: All wiring should be made in accordance
with the National Electrical Code.
Consult your local Power Company to determine the
availability of sufficient power to operate the unit. Check
the voltage, frequency, and phase at the power supply
to ensure 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
nameplate ampacity and in accordance with N.E.C. and
local building codes. Under no circumstances should wiring
be sized smaller than is recommended by either of these
two sources.
Fuses smaller than that recommended on the unit
nameplate 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.
The units are designed for operation at the voltage,
frequency, and phase as shown on the unit nameplate.
All internal wiring in the unit is complete. It is necessary to
bring in the power supply to the contactor as shown on the
unit wiring diagram which is supplied with each unit. The
low voltage wiring must be connected between the unit
control panel and the room thermostat.
All exterior wiring must be within approved weatherproof
conduit. The unit must be permanently grounded 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.
CAUTION
DO NOT EXCEED THE MAXIMUM OVERCURRENT
DEVICE SIZE SHOWN ON UNIT DATA PLATE.
Fuses or HACR type circuit breakers may be used where
codes permit.
IMPORTANT NOTE: Units may be equipped with a
single-pole contactor. Exercise caution when
servicing as only one leg of the power supply is
broken with the contractor.
Unit Voltage
Rated
Minimum Supply
Voltage
208/230V
HIGH VOLTAGE
Disconnect all power before servicing or
installing this unit. Multiple power sources
may be present. Failure to do so may cause
property damage, personal injury or death.
To avoid property the risk of electric shock, wiring to the
unit must be polarized and grounded,.
High Voltage Wiring
• Single Phase. Connect two leads to terminals L1 &
L2 in the electrical control section, using wire sizes
specified in wiring table.
NOTE: The unit transformer is factory connected
for 230V operation. If the unit is to operate on
208V, reconnect the transformer primary lead as
shown on the unit wiring diagram.
Low Voltage Wiring
• Heat Pumps. Connect 24V wires from the thermostat
to the corresponding wires in the control box using
No. 18 AWG as follows:
NOTE: GPHM5 units have two-stage heating/cooling
and require thermostats with two-stage heat/cool
and optional auxiliary heat control.
8
Maximum Supply
Voltage
Voltage
197
WARNING
CAUTION
253
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