24
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 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 V
OLT
L
INE
C
ONNECTION
OF
A
CCESSORIES
(H
UMIDIFIER
AND
E
LECTRONIC
A
IR
C
LEANER
)
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
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 accessories.
Follow the humidifier or air cleaner manufacturers’ instructions
for locating, mounting, grounding, and controlling these accesso-
ries. 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. Connec-
tions should be made as shown.
Accessories Wiring
Figure 32
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. The integrated control module electronic air cleaner
terminals (EAC) are energized with 115 volts whenever the circu-
lator blower is energized. This terminal can also be used to
provide 115 volt power to a humidifier transformer. The re-
maining primary transformer wire would be connected to the
Line N on the control board.
In addition, the control is equipped with a dedicated humidi-
fication relay which is available through ¼ inch terminals
HUM-IN and HUM-OUT. Similar to the HUM terminal, when
utilizing legacy connections, this relay will be closed during
normal heating operation. HUM IN must be powered with
the desired voltage (24 vac from the R terminal or 115 vac
from L1 terminal). The internal relay will close during a call
for heat. Also, the control can provide additional humidifi-
cation features when wired to a communicating thermostat
(1, 2, R, C connections). If the communicating thermostat
is not capable of providing a humidification call, this dedi-
cated relay will function exactly as mentioned above with a
legacy setup. If the communicating thermostat is capable of
providing a humidification call the user is now provided with
3 modes of operations which can be selected within the ther-
mostat user menu.
1. ON: Humidifier is turned on with a heat demand.
2. OFF: Humidifier remains off (relay never closes).
3. IND: Humidifier will cycle with humidification demand,
independent of heat demand. This mode allows the user
to select one of 4 fan speeds (25, 50, 75, and 100%).
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