SYSTEM OPERATION
11
1
2
C
R
C
G
Y
Optional
Optional
Optional if
feature
supported by
thermostat
INDOOR
BOARD TERMINAL
CONNECTIONS
OUTDOOR
BOARD TERMINAL
CONNECTIONS
1
2
C
R
C
G
Y
24 VAC
Thermostat
Communicating Inverter
Air Conditioner or Heat Pump
Low Voltage Wiring - Non-Communicating Outdoor
Unit
When using the furnace with a single stage non-
communicating air conditioner or heat pump use the wiring
methods shown. When using a single stage air conditioner,
the thermostat must be setup for single stage heating and
single stage cooling mode. When using a single stage
heat pump, the thermostat must be setup for dual fuel
operation where the reversing valve is energized in cooling
mode (see Non-Communicating Single Stage Heat Pump
wiring diagram). In both cases airflow must be selected
using the tonnage menu where Airflow = (400 CFM) x
(Selected Tonnage). Tonnage values range from 1 to 6 in
0.1 increments.
NOTE: Airflow will not go above the system Max
CFM. If the tonnage value selected generates an
airflow value above the Max CFM, the system will
cap this value and not provide any more airflow
than the Max CFM.
R
C
G
Y
Optional
Optional
INDOOR
BOARD TERMINAL
CONNECTIONS
R
C
G
Y
24 VAC
Thermostat
1
2
C
Heat Pump
Optional
R
C
Y
This is the only
case where setting the
thermostat to heat pump
mode is acceptable.
Non-communicating Single Stage Heat Pump
R
C
G
Y
Optional
Optional
Optional if
feature
supported by
thermostat
INDOOR
BOARD TERMINAL
CONNECTIONS
1
2
C
R
C
G
Y
C
Y
Remote
Condensing Unit
(Single-Stage Cooling)
24 VAC
Thermostat
Non-communicating Single Stage A/C
Dehumidification
The control board is equipped with a 24 volt dehum
input in the thermostat wiring connector to be used with
a thermostat or dehumidistat. Dehumidification mode
allows the air handler’s circulator blower to operate at a
slightly lower speed (85% of calculated speed) during a
combined thermostat call for cooling and thermostat call for
dehumidification or dehumidistat call for dehumidification.
This lower blower speed enhances dehumidification of the
conditioned air as it passes through the AC coil. If using the
dehum input with a thermostat, configure the thermostat
to energize this terminal when dehumidification is desired.
If using an external dehumidistat, connect it between the
R and Dehum terminals. The dehumidistat must operate
on 24 VAC and utilize a switch which
closes on humidity
rise.
Refer to the low voltage wiring diagrams for additional
wiring details.
R
C
G
Y
Dehumidistat
(close on humidity rise)
Dehumidistat (close on humidity rise)
