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R
C
Thermostat Instructions
Y1
G
W1
INDOOR THERMOSTAT
SUB-BASE (TYPICAL)
Figure 6. Typical Thermostat Connection
(Field Supplied) for 1-Stage Cool / 1-Stage Heat
Thermostat
Wire Gauge
24
22
20
18
Table 3. Thermostat Wire Gauge
Blower Speed
The blower speed is preset at the factory for proper
fan only, heating, and cooling operation. These factory
settings are listed in Table 8 (page 23). For optimum
system performance and comfort, it may be necessary
to change the factory set speed.
CAUTION:
To avoid personal injury or property damage,
make sure the motor leads do not come into
contact with any uninsulated metal components
of the unit.
5-Speed ECM Motor
1. Shut off all electrical power to the unit and remove the
blower panel. Locate the orange, red and blue wires
terminated to the blower motor. NOTE: The orange wire
controls cooling operation while the red wire controls
heating operation. The blue wire controls fan-only
operation.
2. Verify the required speed from the airflow data found
in Table 8. Place appropriate wire on the correct motor
speed tap for the required airflow point.
3. The integrated furnace control can be set to a 2 or 3
speed mode.
NOTE 1: When a G only call is received from the
thermostat (indicating a continuous fan mode), the
blower will run the HEAT speed when the 2-SPD mode
12
R
Optional, Refer to
C
Y
G
W1
Y2
FURNACE
BOARD
Recommended T-Stat Wire
Length (Unit to T-Stat)
2-Wire
5-Wire
(Heating)
(Heating / Cooling)
55
25
90
45
140
70
225
110
is selected using the jumper on the control board (factory
setting).
NOTE 2: When 3-SPD mode is selected, the FAN speed
is energized and may be different than the heating or
cooling speed. If no jumper is present, the control defaults
to the 2-SPD HEAT speed mode of operation. A call for
heating or cooling takes priority over fan only mode.
PSC Motor
1. Disconnect all electrical power to the unit and remove
the control panel cover.
2. Place the desired blower lead (for cooling) on the furnace
board terminal marked COOL.
3. Place the desired blower lead (for heating) on the furnace
board marked HEAT. The unused leads can be placed
on M1, M2, or M3 on the furnace control board. These
are dead terminals.
NOTE 1: RED = Low Speed, BLUE = Medium Speed,
BLACK = High Speed.
NOTE 2: Factory settings require the 024K045 and
030K072 models to have the same cooling and heating
speed. These units will have a jumper from heat to cool
with the factory setting motor speed tap placed on the
jumper.
NOTE 3: When a call for the fan (G) is made, the furnace
board initiates the heat terminal. If heat and cool are
jumpered, the fan, heat and cool will have the same
blower speed.
O p t i o n a l F u r n a c e C o n t r o l B o a r d
Connections
Electronic Air Cleaner
The furnace control board provides output terminals
for an optional electronic air cleaner (EAC) that can be
installed in the return air duct of your system. THE EAC
output is energized any time the HEAT or COOL blower
speed is energized. Control ratings are 1.0 Amp. @ 240
VAC. Output connections are made via board terminals
labeled EAC and NEUTRAL.
Humidifier
The furnace control board provides output terminals for
an optional humidifier (HUM) that can be installed on
your system. The HUM output is energized any time the
furnace inducer motor is energized. Control ratings are
1.0 Amp. @ 240 VAC. Output connections are made via
board terminals labeled HUM and NEUTRAL.
Check all factory wiring to the units wiring diagram. Inspect
the factory wiring connections to be sure none loosened
during shipping or installation.
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