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SYSTEM OPERATION
7
Twinning
Two furnaces of the same model may be twinned. The in-
tegrated control board has a 3/16” terminal labeled “TWIN”
located beside the low voltage thermostat connection strip.
Twinning allows simultaneous operation of two furnaces and
forces the indoor blower motors of each furnace to operate
synchronously into a common duct system. Using the twin-
ning function will require only field installed wiring with no
external kits or parts. The staging and speed tap options
must be set the same on both furnaces.
NOTE:
Each furnace must be connected to it’s own 115
VAC power supply. The L1 connection to each furnace must
be in phase (connected to circuit breakers on the same 115
VAC service panel phase leg). To verify that the furnaces
are in phase, check from L1 to L1 on each furnace with a
voltmeter. If the furnaces are in phase, the voltage between
both furnaces will be ZERO.
ROOM THERMOSTAT
Y2
Y/Y1
C
G
R
W
Y2
Y/Y1
C
G
R
W
Y2
Y/Y1
C
G
R
W
TWIN
TWIN
COND UNIT
CONTACTOR
COND UNIT
CONTACTOR
FURNACE 1
FURNACE 2
115 Volt Line Connection of Accessories
(Humidifier and Electronic Air Cleaner)
The furnace integrated control module is equipped with line
voltage accessory terminals for controlling power to an op-
tional field-supplied humidifier and/or electronic air cleaner.
The accessory load specifications are noted in the chart:
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 acces-
sories. Follow the humidifier or air cleaner manufacturers’ in
-
structions 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 H
and EAC H. 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.
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 terminal (HUM
H) is energized with 115 volts whenever the induced draft
blower is energized. The integrated control module electron-
ic air cleaner terminal (EAC H) is energized with 115 volts
whenever the circulator 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.
WARNING
HIGH VOLTAGE!
To avoid personal injury or death due to electri
-
cal shock, disconnect electrical power before
servicing or changing any electrical wiring.
115 VAC EAC
115 VAC HUM
W R G C Y
Accessories - Accessories Wiring
Low Voltage Humidifier
The furnace integrated control module is equipped with
a low voltage terminal for providing power to an optional
field-supplied 24 volt humidifier. The 24V HUM terminal is
energized any time the draft inducer is powered. See con-
nection diagram below.
NOTE:
This is a 24 volt circuit only, the common connec-
tion must be on C terminal of the low voltage terminal strip
(where thermostat wires are connected). Wiring for this cir-
cuit must NOT be connected to the line N location where line
voltage neutral wires are connected.