Instructions / Assembly
26
Once the switch is set, the dehumidify function is enabled during
a combination call for cooling (T-Stat) and dehumidification
(DEHUM-Stat).
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 out-
door 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 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 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER AND
ELECTRONIC AIR CLEANER)
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
Accessories Wiring
Figure 35
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:
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 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 NEU-
TRAL. All field wiring must conform to applicable codes. Con-
nections should be made as shown. (See Figure 34)
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 single humidifier terminal (HUM)
is energized with 115 volts whenever the induced draft blower is
energized. This terminal can also be used to provide 115 volt
power to a humidifier transformer. The remaining primary
transformer wire would be connected to the Line N on the
control board.The integrated control module electronic air cleaner
terminals (EAC) are energized with 115 volts whenever the circu-
lator blower is energized.
In addition, the control is equipped with a dedicated humidi-
fication relay which is available through ¼ inch terminals