34
Figure 24. Wiring Diagram for Upfl ow and Downfl ow Models
IGNIT
OR
INDUCER
FLAME SENSOR
C
VENT
LIMIT SWITCH
(ON SELECT
MODELS)
DOOR
SWITCH
R
4 SPEED MO
T
O
R
WHITE
RED
BLUE
ORANGE
BLACK
FLAME
R
OLL-OUT
SWITCH
GAS
VA
L
V
E
H
MH
ML
L
C
BLO
WER
LIMIT
SUPPL
Y
AIR LIMIT
BLO
WER
LIMIT
PRESSURE
SWITCH
(ON SELECT
MODELS)
PRESSURE
SWITCH
R C Y G W
GREEN
RED
YELLO
W
BL
WR
OFF
DELA
Y
LOW
ML
MH
HIGH
EAC
L1
XFMR
HUM
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
COM
3 AMP FUSE
24V
24 V
120 V
WHITE
BLA
CK
WHITE W/
BLK
STRIPES
BLK W/ WHITE
STRIPES
11
22
33
44
55
66
77
88
99
NEUTRALS
L1A
GREEN
GR
OUND
BLA
CK
BLA
CK 120V
WHITE
WHITE (NEUTRAL)
ORANGE
BLUE
YELLO
W
YELLO
W
RED
ORANGE
BLA
CK
WHITE
BLUE
ORANGE
BLA
CK
RED
BLA
CK
BLA
CK
BLA
CK
BLUE
BLUE
BLUE
BLUE
BLUE
ORANGE
BLUE
GREEN
BLUE
BLACK
BLA
CK
WHITE
BLACK
WHITE
WD#710731-B
FIELD WIRING
LEGEND:
LO
W V
O
L
T
A
G
E
HIGH V
O
L
T
A
G
E
For 80+ and 90+
Single Sta
g
e
Furnaces
SINGLE ST
A
G
E
THERMOST
A
T
TO
OUTDOOR UNIT
If an
y of the origInal wire as supplied with the
furnace m
ust be replaced,
it m
ust be replaced
with wiring material ha
ving a temperature
rating of at least 105° C.
Use copper conductor
s onl
y
.
Ref
er to the Installation Instructions
pr
o
vided with the furnace f
o
r the
pr
oper heating and cooling speeds
for y
o
ur application.
Gr
een LE
D
R
ed LE
D
Control Fault (No Power)
O
ff
O
ff
L1 / Neutral Polarity
Fault
F
las
h
Flas
h
1 Hour Loc
k
out
Normal O
peration
O
n
O
n
P
re
ssu
re
S
w
it
ch
C
lo
s
e
d
Fa
u
lt
O
n
F
la
sh
Pres
s
u
re Switc
h
O
pen Fault
F
las
h
O
n
O
pen Limit Switc
h
Fault
F
las
h
O
ff
Low Flame Sens
or Signal
Flame Pres
ent
Diagnostic Description
FAULT CONDITIONS
Diagnostic Description
Y
e
llow LE
D
Continuous
Flas
h
On
Alternating Flas
h
