28
3
4
Thermostat
Stage Delay
Move to the ON position
to select two-stage
thermostat or OFF to
select single stage
thermostat
Move to the ON position
to select Auto transition
delay or OFF for 5 minute
transition delay
Heat OFF Delay
DIP Switches
ONOFF
S1
24 VOLT DEHUMIDISTAT WIRING
The optional usage of a dehumidistat allows the furnace’s circula-
tor blower to operate at a slightly lower speed (85% of desired
speed) during a combined thermostat call for cooling and dehumi-
distat call for dehumidification. This can be done through an inde-
pendent dehumidistat or through a thermostat’s DEHUM terminal
(if available). This lower blower speed enhances dehumidification
of the conditioned air as it passes through the AC coil. For proper
function, a dehumidistat applied to this furnace must operate on
24 VAC and utilize a switch which opens on humidity rise. Refer
to the “Thermostat Wiring Diagrams” figure for additional wir-
ing details.
To install/connect a dehumidistat:
1. Turn OFF power to furnace.
2. To enable the dehumidify function on the integrated control
module, set the dehumidification ENABLE dip switch from
OFF to ON.
3. Secure the dehumidistat neutral wire (typically the white
lead) to the terminal marked “DEHUM” on the furnace
integrated control module.
4. Secure the dehumidistat hot wire (typically the black lead)
to the terminal marked “R” on the furnace integrated control
module.
5. Secure the dehumidistat ground wire (typically the green
lead) to the ground screw on the furnace junction box.
NOTE: Ground wire may not be present on all dehumidistats.
6. Turn ON power to furnace.
Once the switch is set, the dehumidify function is enabled during a
combination call for cooling (T-Stat) and dehumidification (DEHUM-
Stat).
1
2
DEHUM
TRIM ENABLE
Move to the ON position
to enable dehumidification
O
OFF
S5
FOSSIL FUEL APPLICATIONS
This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a com-
bined gas furnace and heat pump installation which uses an
outdoor temperature sensor to determine the most cost efficient
means of heating (heat pump or gas furnace).
A heat pump thermostat with three stages of heat is required to
properly use a two-stage furnace in conjunction with a heat pump.
Refer to the fossil fuel kit installation instructions for additional
thermostat requirements.
Strictly follow the wiring guidelines in the fossil fuel kit installation
instructions. All furnace connections must be made to the fur-
nace two-stage integrated control module and the “FURNACE”
terminal strip on the fossil fuel control board.
115 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDI-
FIER AND ELECTRONIC AIR CLEANER)
HIGHVOL TAGE!
T
O
AVOID
PERSONAL
INJU R Y
OR
DEATH
DUE
TO
ELECT R ICAL
SHOCK
,
DISCONNECT
ELECT R ICAL
POWER
BEFORE
SER V ICING
OR
CHANGING
ANY
ELECT R ICAL
WIRING
.
WARNING
The furnace integrated control module is equipped with line volt-
age accessory terminals for controlling power to an optional field-
supplied humidifier and/or electronic air cleaner.
The accessory load specifications are as follows:
Humidifier 1.0 Amp maximum at 120 VAC
Electronic Air Cleaner 1.0 Amp maximum at 120 VAC
Turn OFF power to the furnace before installing any accesso-
ries. Follow the humidifier or air cleaner manufacturers’ instruc-
tions for locating, mounting, grounding, and controlling these ac-
cessories. Accessory wiring connections are to be made through
the 1/4" quick connect terminals provided on the furnace inte-
grated control module. The humidifier and electronic air cleaner
hot terminals are identified as HUM and EAC. The humidifier
and electronic air cleaner neutral terminals are identified as NEU-
TRAL. All field wiring must conform to applicable codes. Con-
nections should be made as shown.
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