25
W1
W2
Y2
Furnace Integrated
Control Module
Remote
Condensing Unit
(Two-Stage Cooling)
Dehumidistat
[Optional]
Y2
NEU
W1
W2
Y2
Thermostat - Two Stage Heating with Two-Stage Cooling
Figure 32
24 V
OLT
D
EHUMIDISTAT
W
IRING
The optional usage of a dehumidistat allows the furnace’s
circulator blower to operate at a slightly lower speed (85% of
esired speed) during a combined thermostat call for cooling
and dehumidistat call for dehumidification. This can be done
trough an independent 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
wiring details. (See Figure 34).
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
ON
OFF
S1
If 3 is ON, #4 is ignored.
Figure 33
1
2
DEHUM
TRIM ENABLE
ON
OFF
S5
Select ON to enable
trim selected by S3 3 & 4.
Move to the ON position
to enable dehumidification.
Figure 34
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).
F
OSSIL
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 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 furnace two-stage integrated control module
and the “FURNACE” terminal strip on the fossil fuel control
board.
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
WIRING
.
WARNING
Humidifier
1.0 Amp maximum at 120 VAC
Electronic Air Cleaner
1.0 Amp maximum at 120 VAC
115 V
OLT
L
INE
C
ONNECTION
OF
A
CCESSORIES
(H
UMIDIFIER
AND
E
LECTRONIC
A
IR
C
LEANER
)
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:
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
terminals are identified as HUM and EAC. The humidifier
and electronic air cleaner neutral terminals are identified as
NEUTRAL. All field wiring must conform to applicable codes.
Connections should be made as shown. (See Figure 35).
If it is necessary for the installer to supply additional line
voltage wiring to the inside of the furnace, the wiring must