16
120 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
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 as follows:
Electronic Air Cleaner
1.0 Amp maximum at 120 VAC
Humidifier
1.0 Amp maximum at 120 VAC
Table 3
Turn OFF power to the furnace before installing any accesso-
ries. Follow the humidifier and/or air cleaner manufacturers’
instructions 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 terminal is identified as HUM and
EAC, the neutral terminal is identified as NEUTRAL. All field
wiring must conform to applicable codes. Connections should
be made as shown in the following illustration.
R
Y
C
Furnace Integrated
Control Module
Remote Condensing Unit
(Single-Stage Cooling)
R
Room
Thermostat
Figure 10
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 120 volts whenever the induced
draft blower is energized. This terminal can also be used
to provide 120 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 120
volts whenever the circulator blower is energized.
NOTE:
Wiring routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
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
combined gas furnace and heat pump installation which uses
an outdoor temperature sensor to determine the most cost
efficient means of heating heat pump or gas furnace.
A heat pump thermostat with
two stages of heat
is required
to properly use a 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
installation instructions. All furnace connections must be made
to the furnace integrated control module and the FURNACE
terminal strip on the fossil fuel control board.
Gas Supply and Piping
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.
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
Inlet gas supply pressures must be maintained within the
ranges specified in the following 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
and damage to gas valve.
NOTE:
Do not remove the gas valve inlet plug before the
gas line is installed. Replace if water or debris has been
introduced.
Natural Gas
Minimum: 4.5" w.c. Maximum: 10.0" w.c.
INLET GAS SUPPLY PRESSURE
Table 4
At all altitudes, the manifold pressure must be within 0.2 inches
w.c. of that listed in the Specification Sheet applicable to your
model for the fuel used. At all altitudes, the air tempera ture
rise must be within the range listed on the furnace nameplate.
High Altitude Derate
IMPORTANT NOTE:
The furnace, as shipped, requires no
change to run between 0-4500 feet. Do not attempt to change
the firing rate by changing orifices or the manifold pressure.
This can cause poor combustion and equipment failure.
At all altitudes, the manifold pressure must be within 0.2
inches w.c. of that listed on the furnace nameplate. At all
altitudes the air temperature rise must be within the range
listed on the the Specification Sheet applicable to your
model for the fuel used.
