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Be sure to set the correct airflow for cooling and
heating.
Switches 1–4 Cooling Airflow
Switches 5–6 Fan Off Delay Options
Switches 7–8 Auxiliary Heat
I I n n d d o o o o r r B B l l o o w w e e r r T T i i m m i i n n g g
I I m m p p o o r r t t a a n n t t : : Leave dip switches 5 and 6 in the "as-
shipped" positions during system start-
up and check out. Afterwards, adjust as
desired.
Table 5. Cooling Off — Delay Options
SWITCH SETTINGS
5 — OFF
6 — OFF
5 — ON
6 — OFF
5 — OFF
6 — ON
5 — ON
6 — ON
(a)
Default setting
This ENHANCED MODE selection provides a ramping up and ramping
(b)
down of the blower speed to provide improved comfort, quietness,
and potential energy savings. The graph shows the ramping process.
Figure 4. Enhanced Mode
80%
Dehumidify
Warm Air Heating
50%
Fast Coil Cooling
Fast Coil Heating
OFF
1
7.5
minute
minutes
COMPRESSOR OPERATION
9. W W i i r r i i n n g g
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.
18-GF79D1-1A-EN
SELECTION
NOMINAL
AIRFLOW
NONE
SAME
1.5 MINUTES
100%
(a)
3 MINUTES
50%
ENHANCED
(b)
50–100%
100% if necessary
50%
Efficiency
OFF
as required
3
minutes
ON
OFF
I I n n s s t t a a l l l l a a t t i i o o n n I I n n s s t t r r u u c c t t i i o o n n s s
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. A A i i r r F F i i l l t t e e r r
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.
I I m m p p o o r r t t a a n n t t : : Air filters shall meet the test requirements
in UL 900.
11. T T h h e e r r m m o o s s t t a a t t
Select a 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. S S e e q q u u e e n n c c e e o o f f O O p p e e r r a a t t i i o o n n
C C o o o o l l i i n n g g ( ( C C o o o o l l i i n n g g o o n n l l y y ) )
When the thermostat calls for cooling, the circuit
from R to G is completed. The blower motor is
energized directly by the ECM fan control, which
receives 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.
C C o o o o l l i i n n g g ( ( h h e e a a t t p p u u m m p p ) )
When the thermostat calls for cooling, the circuit
from R to G is completed. The blower motor is
energized directly by the ECM fan control, which
receives 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.
Circuit R to O energizes the reversing valve to the
cooling position.
15
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