28
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
W
W2
R
G
C
Ylo
Y
W
W2
R
G
C
Ylo
Y
W
W2
R
G
C
Furnace 1
Furnace 2
115 Volt Line Connection of Accessories (Humidi-
fier and Electronic Air Cleaner)
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 noted in the chart below:
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 acces-
sories. Accessory wiring connections are to be made through the
1/4” quick connect terminals provided on the furnace integrat-
ed 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.
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) is
energized with 115 volts whenever the induced draft blower
is energized. The integrated control module electronic air
cleaner terminal (EAC) 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.
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
WIRING
.
WARNING
Accessories - Accessories Wiring
Figure 33
Gas Supply and Piping
T
O
AVOID
POSSIBLE
UNSATISFACTORY
OPERATION
OF
EQUIPMENT
DAMAGE
DUE
TO
UNDERFIRING
OR
EQUIPMENT
,
USE
THE
PROPER
SIZE
OF
NATURAL
/
PROPANE
GAS
PIPING
NEEDED
WHEN
RUNNING
PIPE
FROM
THE
METER
/
TANK
TO
THE
FURNACE
.
WARNING
Natural Gas
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
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.
Inlet gas supply pressures must be maintained within the ranges
specified in the adjacent table. The supply pressure must
be constant and available with all other household gas fired
appliances operating. The minimum gas supply pressure
must be maintained to prevent unreliable ignition. The
maximum must not be exceeded to prevent unit overfiring.
High Altitude Derate
When this furnace is installed at high altitude, the appropriate
High Altitude orifice kit must be applied. This is required due
