PRODUCT DESIGN
32
HUMIDIFIER WIRING
Accessory wiring connections are to be made through the
1/4" quick connect terminals provided on the furnace inte-
grated control module.
The Humidifier and Electronic Air
Cleaner hot and neutral terminals are identified as HUM
and EAC. All field wiring must conform to applicable codes.
Connections should be made as shown below.
ELECTRONIC
AIR CLEANER
HUMIDIFIER
OPTIONAL
ACCESORIES
12 PIN
CONNECTOR
120 VAC
NEUTRAL
TERMINALS
NE
UT
R
AL
H
U
M
-H
EA
C
-H
120 VAC
HOT AND
PARK
TERMINALS
INTEGRATED
CONTROL
MODULE
Accessory Wiring
(certain control boards)
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 energized with 115 volts whenever the induced draft
blower is energized. The integrated control module electronic
air cleaner terminals (EAC) are energized with 115 volts
whenever the circulator blower is energized.
24 VOLT THERMOSTAT WIRING
NOTE:
Low voltage connections can be made through either
the right or left side panel. Wire routing must not interfere
with circulator blower operation, filter removal, or routine
maintenance.
A 40 V.A. transformer and an integrated electronic control are
built into the furnace to allow use with most cooling equip-
ment. Consult the wiring diagram, located in the Technical
Manual or on the blower door for further details of 115 Volt
and 24 Volt wiring.
THERMOSTAT WIRING - SINGLE-STAGE
The single stage furnace will have a "W" terminal and will use
a single stage thermostat. The following drawing illustrates
the typical field wiring for a heat only single stage system and
a single stage heating/single stage cooling system. Refer to
the following figures for proper connections to the integrated
control module.
Typical Field Wiring (24 VAC Control Circuit)
CONTINUOUS FAN OPERATION
SINGLE STAGE FUR-
NACES
The single stage furnace control will energize the
heating
circulator fan speed when the fan switch on the thermostat
is turned to the "ON" position.
CIRCULATOR BLOWER SPEED ADJUSTMENT
WARNING
HIGH
VOLTAGE
E
LECTRICAL COMPONENTS ARE CONTAINED IN BOTH
COMPARTMENTS.
T
O AVOID ELECTRICAL SHOCK, INJURY OR
DEATH, DO NOT REMOVE ANY INTERNAL COMPARTMENT COVERS
OR ATTEMPT ANY ADJUSTMENT.
C
ONTACT A QUALIFIED
SERVICE AGENT AT ONCE IF AN ABNORMAL FLAME
APPEARANCE SHOULD DEVELOP.
Connect the correct motor leads to the COOL, HEAT, and
PARK terminals. If the heating speed equals cooling speed,
use the jumper wire provided. All unused motor leads that
are not connected to "PARK" terminals on the control must
be taped to prevent shorts.
CIRCULATING AIR AND FILTERS
DUCTWORK - AIR FLOW
Duct systems and register sizes must be properly designed
for the C.F.M. and external static pressure rating of the fur-
nace. Ductwork should be designed in accordance with the
recommended methods of "Air Conditioning Contractors of
America" manual D.
A duct system should be installed in accordance with Stan-
dards of the National Board of Fire Underwriters for the Instal-
lation of Air Conditioning, Warm Air Heating and Ventilating
Systems, Pamphlets No. 90A and 90B.
A return air filter is not supplied with the furnace. The installer
must supply a means of filtering all of the return air. Filter(s)
shall comply with UL900 or CAN/ULC-S111 Standards.
