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Figure 30. Downflow Furnace Wiring Diagram
WD #710240B
If
an
y
o
fth
e
ori
g
ina
l
wit
h
th
e
f
u
rn
ace
m
us
t
be
re
p
laced, i
t
m
us
t
be
re
p
laced wirin
g
m
a
t
e
ri
a
l
h
avin
g
a
ratin
g
of
a
tl
eas
t
˚
C.
U
se co
pp
e
r
co
n
duc
t
o
r
s
o
nl
y.
IGNITOR
INDUCER
GAS
VALVE
SUPPLY AIR
LIMIT SWITCH
(ALL MODELS)
VENT
SAFETY
SWITCH
(ALL MODELS)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACK
WHITE
BLUE
24 V
120 V
ORANGE
BLUE
BLUE
YELLOW
BROWN
RED
BLACK
WHITE
ORANGE
BLUE
BLACK
ORANGE
BLACK
RED
AIR CONDITIONER
CONDENSING UNIT
BLACK
BLACK
R
WHITE
BLACK
WHITE W/ BLK STRIPES
BLK W/ WHITE STRIPES
WHITE (NEUTRAL)
BLACK 120V
GROUND
ROOM THERMOSTAT
3 OR 4 SPEED MOTOR
H
MH
ML
L
C
WHITE
RED
ORANGE
BLUE
BLACK
M
O
T
OR
PL
UG
1
2
3
4
5
6
BLACK
BLUE
FLAME ROLL-OUT
SWITCH
(ALL MODELS)
PRESSURE
SWITCH
R
Y
G
W
C
Y
180
120
90
60
Legend
Field Wiring
Factory Wiring:
Low Voltage
High Voltage
BLOWER DECK SWITCH
Factor
y
Wire
d
Heatin
g
Speeds
F
u
rn
ace
In
p
ut, Btu
h
60
,
00
0
80
,
00
0
Wir
e
C
olo
r
R
ed
Bl
ue
Power On
Limit Circuit Open or External Load On "W"
(Does not apply to Deck Switch, see below)
Pressure Switch Open with Inducer On
Pressure Switch Closed with Inducer On
Ignition Failure (Check Ground)
115 VAC & Neutral Reversed or no Ground
False Flame or Gas Valve Relay Shorted
ON
1 FLA
SH
2 FLA
S
HE
S
3
FLA
S
HE
S
4 FLASHE
S
5
FLA
S
HE
S
C
ontinuou
s
S
TAT
US
RED
LI
G
H
T
FAULT CONDITION
Power Off or Deck Limit Open
Low Flame Sensor Signal
Flame Present
C
ontinuou
s
Flash
OFF
ON
FLAME
YELL
O
W
LI
G
H
T
FAULT CONDITION
ON/OFF SWITCH