Installation Guide

13
A single-stage thermostat with only one heating stage can be used
to control this furnace.
115 VOLT LINE VOLTAGE 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 optional
field-supplied humidifier and/or electronic air cleaner.
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
accessories. Accessory wiring connections are to be made through
the 1/4” quick connect terminals provided on the furnace
integrated control module. The humidifier hot terminal is
identified as 120V HUM-H, its neutral terminal is identified as
120V HUM-N. The electronic air cleaner hot terminal is identified
as EAC-H, its neutral terminal is identified as 120V EAC-N.All field
wiring must conform to applicable codes. Connections should be
made as shown. (See Figure 30.)
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 120V HUM-H
is energized with 115 volts whenever the induced draft 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. The integrated control module electronic air cleaner
terminals EAC-H is energized with 115 volts whenever the
circulator blower is energized.
NOTE: Wire routing must not to interfere with circulator blower
operation, filter removal, or routine maintenance.
After the junction box is in the desired location, use washers to
connect field-supplied conduit to the junction box in accordance
with NEC and local codes. Connect hot, neutral, and ground wires
as shown in the furnace wiring diagram. The wires and ground
screw are located in the furnace junction box.
NOTE: In downflow applications the power leads should be routed
through the supplied wire tabs when rotating junction box to the
left side.
Low voltage wires may be connected to the terminal strip.
IMPORTANT NOTE: To avoid possible equipment malfunction, route
the low voltage wires to avoid interference with filter removal or
other maintenance.
HIGH VOLTAGE !
T O AVOID THE RISK OF INJURY , ELECTRICAL SHOCK OR
DEATH , THE FURNACE MUST BE ELECTRICALLY
GROUNDED IN ACCORDANCE WITH LOCAL CODES OR IN
THEIR ABSENCE , WITH THE LATEST EDITION OF THE
N
ATIONAL E LECTRIC C ODE .
WARNING
To ensure proper unit grounding, the ground wire should run from
the furnace ground screw located inside the furnace junction box
all the way back to the electrical panel. NOTE: Do not use gas
piping as an electrical ground. To confirm proper unit grounding,
turn off the electrical power and perform the following check.
1. Measure resistance between the neutral (white) connection
and one of the burners.
2. Resistance should measure 10 ohms or less.
This furnace is equipped with a blower door interlock switch which
interrupts unit voltage when the blower door is opened for
servicing. Do not defeat this switch.
24 VOLT THERMOSTAT WIRING
NOTE: Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
Low voltage connections can be made through either the right or
left side panel. Thermostat wiring entrance holes are located in
the blower compartment. The following figure shows connections
for a “heat only” system and “heat/cool system”.
Furnace
Control
Furnace
Control
Remote
Condensing
Unit
Heating
Room
Thermostat
Heating/Cooling
Room Thermostat
WW
Typical Field Wiring (24 VAC Control Circuit)
This furnace is equipped with a 40 VA transformer to facilitate use
with most cooling equipment. Consult the wiring diagram, located
on the blower compartment door, for further details of 115 Volt
and 24 Volt wiring.