PRODUCT DESIGN
62
ELECTRONIC
AIR CLEANER
HUMIDIFIER
OPTIONAL
ACCESORIES
12 PIN
CONNECTOR
120 VAC
NEUTRAL
TERMINALS
N
E
U
T
R
A
L
HUM-H
EAC-H
120 VAC
HOT AND
PARK
TERMINALS
INTEGRATED
CONTROL
MODULE
Accessory Wiring
(WR50A65 Ignition Control Shown)
OPTIONAL ACCESSORIES
EAC-H
12 CIRCUIT
CONNECTOR
INTEGRATED
CONTROL MODULE
ELECTRONIC
AIR CLEANER
HUMIDIFIER
HUM-N
HUM-H
EAC-N
Accessory Wiring
(WR50V-51 Ignition Control)
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 tempera-
ture 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 when-
ever the circulator blower is energized.
24 VOLT THERMOSTAT WIRING
NOTE: Low voltage connections can be made through ei-
ther the right or left side panel. Wire routing must not inter-
fere 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 - 80% & 90% SINGLE-STAGE
The single stage furnace will have a "W" terminal and will
use a single stage thermostat. The following drawing illus-
trates the typical field wiring for a heat only single stage
system and a single stage heating/single stage cooling sys-
tem. Refer to the following figures for proper connections to
the integrated control module.
W
G
Single-Stage Heating Only
R
C
G R
W
Y
Furnace Integrated
Control Module
Thermostat
Single-Stage Heating
(
)
W
G
Y
Single-Stage Heating with Single-Stage Cooling
R
C G R WY
Y C
Furnace Integrated
Control Module
Thermostat
Single-Stage Heating
with
Single-Stage Cooling
()
Remote
Condensing Unit
(Single-Stage Cooling)
C
Typical Field Wiring - Single-Stage Gas Furnaces
(24 VAC Control Circuit)
Thermostat Wiring - 80% & 90%
Two-Stage Variable Speed Furnaces
As a two-stage furnace, the furnace integrated control mod-
ule provides terminals for both “W1” and “W2”, and “YLO”
and “Y” thermostat connections. This allows the furnace to
support the following system applications: ‘Two-Stage Heat-
ing Only’, ‘Single-Stage Heating with Single-Stage Cooling’,
‘Two-Stage Heating with Single-Stage Cooling’, and ‘Two-
Stage Heating with Two-Stage Cooling’. Refer to the follow-
ing figures and table for proper connections to the integrated
control module.
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