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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.
In addition, the control is equipped with a dedicated humidifi-
cation 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 (115VAC must be present on the HUM-IN
terminal to take advantage of HUM-OUT). However, the con-
trol can provide additional humidification 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 dedicated relay will function exactly
as mentioned above with a legacy setup. If the communicat-
ing thermostat is capable of providing a humidification call the
user is now provided with 3 modes of operations which can be
selected within the thermostat 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, in-
dependent of heat demand. This mode allows the user to
select one of 4 fan speeds (25, 50, 75, and 100%).
NEUTRAL
24 V
H
OLT
UMIDIFIER
A 5" long brown wire in the wire harness at the low fire pressure
switch 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
connection 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 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.
A
A
S
UXILIARY
LARM
WITCH
The control is equipped with a 24VAC Auxiliary Alarm Input
(12 inch purple / white wire attached to pin 6 of 15 pin connec-
tor) which can be utilized with communicating mode setups
(typically used for condensate switch wiring but could be used
with compatible C0
sensors or Fire Alarms).
2
Legacy mode use
In a legacy system (Non-communicating), this auxiliary alarm
input is not operational. Any auxiliary alarm switch must be
used to interrupt Y1 signal either to IFC or to UC.
Communication mode use
This feature can be activated or deactivated through the ther-
mostat user menus. By default, an AUX switch is normally
closed and opens when the water level in the evaporator coil
base pan reaches a particular level. The control will respond
by turning off the outdoor compressor and display the proper
fault codes. If the AUX switch is detected closed for 30 sec-
onds, normal operation resumes and error messages are no
longer displayed. Installer must wire control voltage (24VAC)
to AUX switch to ensure the Auxiliary Alarm Input has 24VAC
during normal operation.
G
S
P
AS
UPPLY AND
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.
T
O
PREVENT
UNRELIABLE
INLET
GAS
SUPPLY
PRESSURE
RATING
PLATE
WITH
ALL
OTHER
.
OPERATING
30
:
IPING
CAUTION
OPERATION
OR
EQUIPMENT
DAMAGE
MUST
BE
AS
SPECIFIED
ON
THE
HOUSEHOLD
GAS
FIRED
APPLIANCES
,
THE
UNIT
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