18-GF81D1-1A-EN
15
NNoottee:: The system is configured to always provide
high-stage airflow when the electric heater is
operating even when the unit is configured
for two stages of airflow.
9. WWiirriinngg
Consult all schematic and pictorial wiring diagrams
of this unit and the outdoor equipment to
determine compatibility of wiring connections and
to determine specific requirements.
All field wiring to the air handler should be installed
in accordance with the latest edition of the National
Electric Code NFPA No. 70 and any local codes.
Check rating plates on unit for rated volts,
minimum circuit ampacity and maximum over
current protection. Supply circuit power wiring
must be 75 degree C (167 degree F) minimum
copper conductors only. Copper supply wires shall
be sized to the National Electric Code or local code
requirements, whichever is more stringent.
To allow disconnection of the air handler from the
power supply, a disconnection from the supply
mains having a contact separation in all poles must
be incorporated into the fixed wiring in accordance
with national, state, and local codes.
The unit is shipped wired for 230/240 Volt AC 60 HZ
1 Phase Operation. If the unit is to be operated at
208 VAC 60HZ, follow the instructions on the indoor
unit wiring diagram to change the low voltage
transformer to 208 VAC operation (Ensure unit is
properly grounded).
Class 2 low voltage control wiring should not be run
in conduit with power wiring and must be
separated from power wiring unless class 1 wire
with proper voltage rating is used.
Low voltage control wiring should be 18 Awg, color
coded (105 degree C minimum). For lengths longer
than 100ft., 16 Awg wire should be used. Make
certain that separation of control wiring and power
wiring has been maintained.
10. AAiirr FFiilltteerr
To protect the coil, blower and other internal parts
from excessive dirt and dust an air filter must be
installed before air enters the evaporator coil. A
remote filter must be installed. Consult the filter
manufacturer for proper sizing and maximum
velocity requirements.
IImmppoorrttaanntt:: Air filters shall meet the test requirements
in UL 900.
11. TThheerrmmoossttaatt
Select a single or two-stage thermostat that is
commonly used with HP or AC heating/cooling with
electric heat. The thermostat will energize the fan
on a demand for heat or cool.
Install the thermostat on an inside wall, away from
drafts, lights or other heat sources in a location that
has sufficient air circulation from other rooms being
controlled by the thermostat.
12. SSeeqquueennccee ooff OOppeerraattiioonn
CCoooolliinngg ((CCoooolliinngg oonnllyy))
When the thermostat calls for cooling, the circuits
from R to G is completed. The green wire to the
blower motor is energized directly by the 24VAC
signal from the thermostat.
The circuit from R to Y is also complete energizing
the compressor contactor of the outdoor unit. The
contactor will close and start the compressor and
condenser fan motor.
Completion of the circuit from R to Y (or R to Y2, if
indoor is configured for two-stage airflow)
energizes the coil of the relay on the indoor unit.
The relay energizes the black wire to the blower
motor and activates high-stage airflow.
CCoooolliinngg ((hheeaatt ppuummpp))
When the thermostat calls for cooling, the circuits
from R to G is completed. The green wire to the
blower motor is energized directly by the 24VAC
signal from the thermostat.
The circuit from R to Y is also complete energizing
the compressor contactor of the outdoor unit. The
contactor will close and start the compressor and
condenser fan motor.
Completion of the circuit from R to Y (or R to Y2, if
indoor is configured for two-stage airflow)
energizes the coil of the relay on the indoor unit.
The relay energizes the black wire to the blower
motor and activates high-stage airflow.
Circuit R to O energizes the reversing valve to the
cooling position.
HHeeaattiinngg ((hheeaatt ppuummpp))
When the thermostat calls for cooling, the circuits
from R to G is completed. The green wire to the
blower motor is energized directly by the 24VAC
signal from the thermostat.
The circuit from R to Y is also complete energizing
the compressor contactor of the outdoor unit. The
contactor will close and start the compressor and
condenser fan motor.
Completion of the circuit from R to Y (or R to Y2, if
indoor is configured for two-stage airflow)
energizes the coil of the relay on the indoor unit.
The relay energizes the black wire to the blower
motor and activates high-stage airflow.
In the heating mode, the reversing valve of the
outdoor unit is not energized.
If the indoor temperature continues to fall, the R to
W circuit is completed energizing the electric heat
contactor(s).
IInnssttaallllaattiioonn IInnssttrruuccttiioonnss
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