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tion. This lower blower speed enhances dehumidification of the
conditioned air as it passes through the AC coil. For proper func-
tion, a dehumidistat applied to this furnace must operate on 24
VAC and utilize a switch which opens on humidity rise.
To install/connect a dehumidistat:
1. Turn OFF power to furnace.
2. Secure the dehumidistat neutral wire (typically the white
lead) to the screw terminal marked “DEHUM” on the furnace
integrated control module.
3. Secure the dehumidistat hot wire (typically the black lead)
to the screw terminal marked “R” on the furnace integrated
control module.
4. 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.
5. Turn ON power to furnace.
To enable the dehumidify function on the integrated control mod-
ule:
1. Cut the jumper wire labeled “CUT FOR DEHUM” located
adjacent to the DEHUM screw terminal.
Once the jumper wire is cut, the dehumidify function is enabled
during a combination call for cooling (T-Stat) and dehumidification
(Dehum-Stat). The yellow LED adjacent to the DEHUM screw ter-
minal will be illuminated during dehumidification.
0 YL0 Y B/C G R W1 W2
TWI N
DEHUM
CUT FOR
DEHUM
0YL0YB/CG RW1W2
CR35
R12 2
R128
W3
DS7 R191
R85
DS3
R8 4
R22
DS4 DS5
TP1
TP2
DEHUMIDIFICATION
LED (YELLOW)
DEHUMIDIFICATION
JUMPER WIRE
(CUT TO ENABLE)
W14
FOSSIL F UEL A PPLICATIONS
This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a combined
gas furnace and heat pump installation which uses an outdoor
temperature sensor to determine the most cost efficient means of
heating (heat pump, gas furnace, or both).
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 installa-
tion instructions. All furnace connections must be made to the
furnace two-stage integrated control module and the “FUR-
NACE” terminal strip on the fossil fuel control board.
115 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER
AND
E LECTRONIC A IR CLEANER)
WARNING
T
O AVOID INJURY, ELECTRICAL SHOCK OR DEATH, DISCONNECT ELECTRICAL
POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING.
The furnace’s 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 accessories.
Follow the humidifier or air cleaner manufacturers’ instructions for
locating, mounting, grounding, and controlling these accessories.
Accessory wiring connections are to be made through the 1/4"
quick connect terminals provided on the furnace integrated control
module. The humidifier and electronic air cleaner hot and neutral
terminals are identified as HUM and EAC. All field wiring must
conform to applicable codes. Connections should be made as
shown.
OPTIONAL ACCESSORIES
EAC-H
12 CIRCUIT
CONNECTOR
INTEGRATED
CONTROL MODULE
ELECTRONIC
AIR CLEANER
HUMIDIFIER
HUM-N
HUM-H
EAC-N
OPTIONAL ACCESSORIES
EAC-N
12 CIRCUIT
CONNECTOR
INTEGRATED
CONTROL MODULE
ELECTRONIC
AIR CLEANER
HUMIDIFIER
HUM-H
HUM-N
EAC-H
Accessories Wiring
If it is necessary for the installer to supply additional line voltage
wiring to the inside of the furnace, the wiring must conform to all
local codes, and have a minimum temperature rating of 105°C. All
line voltage wire splices must be made inside the furnace junction
box.
The integrated control module humidifier terminals (HUM) are en-
ergized with 115 volts whenever the induced draft blower is ener-
gized. The integrated control module electronic air cleaner termi-
nals (EAC) are energized with 115 volts whenever the circulator
blower is energized.
24 VOLT HUMIDIFIER
A 5" long brown wire in the wire harness at the low fire pressure
provides 24 VAC humidifier control. This wire is powered any time
the pressure switch is closed. To connect 24 VAC HUM, connect
the 24 VAC line of the humidifier to the 5” brown wire. The connec-
tion can be made by either stripping the wire and using a wire nut
or by using a field supplied quick connect terminal. The wiring
must conform to all local and national codes. Connect the COM
side of the humidifier to the B/C terminal on the furnace control
board (or to the COM side of the 24 VAC transformer). Do not
connect 115V humidifier to these terminals.
XII. GAS SUPPLY AND PIPINGXII. GAS SUPPLY AND PIPING
XII. GAS SUPPLY AND PIPINGXII. GAS SUPPLY AND PIPING
XII. GAS SUPPLY AND PIPING
GENERAL
The furnace rating plate includes the approved furnace gas input
rating and gas types. The furnace must be equipped to operate on
the type of gas applied. This includes any conversion kits required
for alternate fuels and/or high altitude.
CAUTION
T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE INLET
GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE
WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING.