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mode). If the AUTO mode is selected, the control averages the
cycle times of the previous three cycles and uses the average to
determine the time to transition from low stage to high stage.
To use a single-stage thermostat, turn off power to the furnace,
move the thermostat selection DIP switch to the OFF position. Set
the desired transition time by setting the transition delay DIP switch
to the desired ON/OFF position. Turn power back on. Refer to the
following figure.
OFF
Heat OFF Delay
DIP Switches
3
4
S1
24 V
24 V
24 V
24 V
24 V
D D D D D
W W W W W
OLT
OLT
EHUMIDISTAT
EHUMIDISTAT
OLT
OLT
OLT
EHUMIDISTAT
EHUMIDISTAT
EHUMIDISTAT
The optional usage of a dehumidistat allows the furnace's circulator
blower to operate at a slightly lower speed (82% of desired speed)
during a combined thermostat call for cooling and dehumidistat
call for dehumidification. This can be done through an indepen-
dent 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.
To install/connect a dehumidistat:
1. Turn OFF power to furnace.
2. Secure the dehumidistat neutral wire (typically the white
lead) to the terminal marked "DEHUM" on the furnace
integrated control module.
3. Secure the dehumidistat hot wire (typically the black lead)
to the 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:
NOTE:
NOTE:
NOTE: Ground wire may not be present on all dehumidistats.
NOTE:
5. Turn ON power to furnace.
To enable the dehumidify function on the integrated control mod-
ule, set the dehumidification ENABLE dipswitch from OFF to ON.
Once the switch is set, the dehumidify function is enabled during a
combination call for cooling (T-Stat) and dehumidification (DEHUM-
Stat).
OFF
9
10
S5
F F F F F
F F F F F
A A A A A
OSSIL
OSSIL
OSSIL
UEL
UEL
UEL
PPLICATIONS
PPLICATIONS
PPLICATIONS
OSSIL
OSSIL
UEL
UEL
PPLICATIONS
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
ON
Move to the ON position
to select two-stage
thermostat or OFF to
select single stage
thermostat
Thermostat
Stage Delay
Move to the ON position
to select Auto transition
delay or OFF for 5 minute
transition delay
IRING
IRING
IRING
IRING
IRING
ON
DEHUM
Move to the ON position
to enable dehumidification
Unused
E E E E E
furnace and heat pump installation which uses an outdoor tem-
perature 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 installa-
tion instructions. All furnace connections must be made to the
furnace two-stage integrated control module and the "FURNACE"
terminal strip on the fossil fuel control board.
115 V
115 V
115 V
L L L L L
C C C C C
115 V
115 V
OLT
OLT
INE
INE
ONNECTION
ONNECTION
OLT
OLT
OLT
INE
INE
INE
ONNECTION OF
ONNECTION
ONNECTION
E E E E E
A A A A A
C C C C C
AND
AND
AND
AND
AND
LECTRONIC
LECTRONIC
LECTRONIC
LECTRONIC
LECTRONIC
IR IR IR IR IR
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
,
ELECTRICAL
SHOCK
DISCONNECT
BEFORE
SERVICING
OR
CHANGING
.
WIRING
The furnace integrated control module is equipped with line
voltage accessory terminals for controlling power to an optional
field-supplied humidifier and/or electronic air cleaner.
The accessory load specifications are as follows:
Humidifier
Electronic Air Cleaner
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 acces-
sories. 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.
Accessories Wiring
17
C C C C C
L E C T R I C A L
L E C T R I C A L
L E C T R I C A L
L E C T R I C A L
L E C T R I C A L
O N N E C T I O N S
O N N E C T I O N S
O N N E C T I O N S
O N N E C T I O N S
O N N E C T I O N S
A A A A A
OF
OF
CCESSORIES
CCESSORIES
OF
OF
CCESSORIES
CCESSORIES
CCESSORIES
) ) ) ) )
LEANER
LEANER
LEANER
LEANER
LEANER
WARNING
OR
DEATH
DUE
TO
ELECTRICAL
POWER
ANY
ELECTRICAL
1.0 Amp maximum at 120 VAC
1.0 Amp maximum at 120 VAC
(H (H (H (H (H
UMIDIFIER
UMIDIFIER
UMIDIFIER
UMIDIFIER
UMIDIFIER
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