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STANDARD
JUNCTION BOX
LOCATION
ALTERNATE
JUNCTION BO
X
LOCATION
Junction Box Relocation
WARNING
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.
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 servic-
ing. Do not defeat this switch.
24 VOLT T HERMOSTAT W IRING
NOTE: Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
As a two-stage furnace, the furnace integrated control module pro-
vides terminals for both “W1” and “W2”, and “YLO” and “Y” thermo-
stat connections. This allows the furnace to support the following
system applications: ‘Two-Stage Heating Only’, ‘Two-Stage Heat-
ing with Single-Stage Cooling’, and ‘Two-Stage Heating with Two-
Stage Cooling’. Refer to the following figures and table for proper
connections to the integrated control module.
Low voltage connections can be made through either the right or
left side panel. Thermostat wiring entrance holes are located in the
blower compartment. Wire routing must not interfere with circula-
tor blower operation, filter removal, or routine maintenance.
W
G
Y
Single-Stage Heating with Single-Stage Cooling
R
B/C G R W1 W2O YLO Y
DEHUM
TWIN
Y C
NEU
HOT
Furnace Integrated
Control Module
Thermostat
Single-Stage Heating
with
Single-Stage Cooling
()
Remote
Condensing Unit
(Single-Stage Cooling)
Dehumidistat
[Optional]
NOTE:
To apply a single-stage heating thermostat, the
thermostat selector jumper on the integrated Control
module must be set on single stage.
W1
G
Y
Two-Stage Heating with Single-Stage Cooling
R
W2
B/C G R W1 W2O
YLO
Y
DEHUM
TWIN
Y C
NEU
HOT
Furnace Integrated
Control Module
Thermostat
Two-Stage Heating
with
Single-Stage Cooling
()
Remote
Condensing Unit
(Single-Stage Cooling)
Dehumidistat
[Optional]
G
Y
Two-Stage Heating with Two-Stage Cooling
R
B/C G R W1 W2O
YLO
Y
DEHUM
TWIN
NEU
HOT
Furnace Integrated
Control Module
Thermostat
Two-Stage Heating
with
Two-Stage Cooling
()
Remote
Condensing Unit
(Two-Stage Cooling)
Dehumidistat
[Optional]
Y
C
YLO
YLO W2
W1
Thermostat Diagrams
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.
SINGLE-STAGE T HERMOSTAT A PPLICATION
A single-stage thermostat with only one heating stage can be used
to control this furnace. The application of a single-stage thermo-
stat does not offer “true” thermostat-driven two-stage operation,
but provides a timed transition from low to high fire. The furnace
will run on low stage for a fixed period of time before stepping up to
high stage to satisfy the thermostat’s call for heat. The delay pe-
riod prior to stepping up can be set at either 5 or 10 minutes through
the DIP switch adjacent to the Heat Off delay DIP switches on the
integrated control module. To use a single-stage thermostat, turn
off power to the furnace, move the thermostat selection jumper on
the integrated control module from the “two-stage” position to the
“single-stage” position, turn power back on. Refer to the following
figures.
3
2
1
T
W
O
S
I
N
G
L
E
TSTAT
OFF
3
2
1
T-Stat selection jumper in
single-stage thermostat
position.
DIP switch position 3: ON
Dela
y
Period: 10 minutes.
DIP switch position 3: OFF
Dela
y
Period: 5 minutes.
T
W
O
S
I
N
G
L
E
TSTAT
ON
24 VOLT DEHUMIDISTAT W IRING
The optional usage of a dehumidistat allows the furnace’s circula-
tor blower to operate at a slightly lower speed during a combined
thermostat call for cooling and dehumidistat call for dehumidifica-