18-GF15D1-1B-EN
7
Table 3. Cooling Off — Delay Options
SWITCH SETTINGS SELECTION NOMINAL
AIRFLOW
5 — OFF 6 — OFF NONE SAME
5 — ON 6 — OFF 1.5 MINUTES 100%
(a)
5 — OFF 6 — ON 3 MINUTES 50%
5 — ON 6 — ON ENHANCED
(b)
50–100%
(a)
Default setting
(b)
This ENHANCED MODE selection provides a ramping up and ramping
down of the blower speed to provide improved comfort, quietness,
and potential energy savings. The graph shows the ramping process.
Figure 3. Enhanced Mode
OFF OFF
50%
80%
100% if necessary
50%
Dehumidify
Warm Air Heating
Fast Coil Cooling
Fast Coil Heating
Efficiency
7.5
minutes
3
minutes
1
minute
FAN OPERATION (CFM)
as required
COMPRESSOR OPERATION ON
OFF
10. 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.
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.
11. 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.
12. TThheerrmmoossttaatt
Select a thermostat that is commonly used with HP
or AC single stage 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.
13. SSeeqquueennccee ooff OOppeerraattiioonn
CCoooolliinngg ((CCoooolliinngg oonnllyy))
Variable speed version – 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.
Constant torque version – When the thermostat
calls for cooling, the circuit from R to G is
completed. 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.
CCoooolliinngg ((hheeaatt ppuummpp))
Variable speed version – 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.
Constant torque version – When the thermostat
calls for cooling, the circuit from R to G is
completed. The blower motor is energized directly
by the 24VAC signal from the thermostat.
The circuit from R to Y is also complete energizing
IInnssttaallllaattiioonn IInnssttrruuccttiioonnss
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