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Fig. 12—Wiring Diagram
A96076
FACTORY SET
HEATING SPEED
ENLARGED TOP VIEW 6-PIN PLUG (CN23)
GND
L2 (N)
L1 (H)
BI
WH
BK
50, 75K INPUT
100, 125K INPUT
POWER SUPPLY
115 VAC 1 PH 60 HZ
(FUSED DISCONNECT
ON HOT LEG)
60 SEC
DELAY OFF DIP SWITCH SETTINGS
90 SEC
120 SEC
150 SEC
50 & 75K INPUTS-LOW (L)
100 & 125K INPUTS-MEDIUM (M)
6
12
L2(N)
115 VAC 1Ø 60 HZ POWER SUPPLY
(FUSED DISCONNECT ON HOT LEG)
L1(H)
N1
N2
LOW
MED
50, 75
100, 125
HEAT
K1
K2
K2
K3
D1
COOL
GND
BI
S1
S2
HI
N3
N4
C
GND
TSTAT
CN23-2
LOW SPEED
HEAT CONNECTION
CONTINUOUS LOW SPEED FAN OPTIONS
CONTINUOUS LOW SPEED FAN WITH
OPTIONAL INTERUPT FAN SWITCH
CONSTANT
CONSTANT
CONSTANT
HEAT
MED
LOW
HIGH
HEAT
COOL
COOL
UNUSED MOTOR
LEAD
N2
GND
FT
SV9500 HOT SURFACE PILOT
IGNITION SYSTEM CONTROL
TSTAT
24V
X
CN23-1
LIMIT
CONTROL
ROS
L
P
ROS
BI
CU
*
T
F1
LEGEND
PRINTED CIRCUIT
BOARD WIRING
BK
BL
BR
GR
OR
RD
RD/BK
VI
WH
YL
BLACK
BLUE
BROWN
GREEN
ORANGE
RED
RED/BLACK STRIPE
VIOLET
WHITE
YELLOW
LINE V
24V
FACTORY WIRING
FIELD WIRING
ORANGE WIRE NUT
GROUND
LIMIT
PRESSURE SWITCH
ROLL OUT SWITCH*
BLOWER INTERLOCK
CONDENSING UNIT
MANUAL RESET
TRANSFORMER
LOW VOLT. FUSE
PS1
CN23-6
PS2
W1
CN23-3
COM
N.C.
G
CN23-5
N.O.
PRESSURE SW.
(115VAC)
24VAC
TRANSFORMER
CONDENSING
UNIT
ST9120C2010 ELECTRONIC
FAN TIMER
INDUCER
MOTOR
CIRCULATION
FAN
BL
4 3
L
M H
INDOOR
BLOWER
& MOTOR
INDUCER
BLOWER
C
2 1
BK
WH
RD/BK
WH
RD
YL
BL
OR
BL
VI
VI
24V PRESS. SW
24V COM
24V HOT
EFT
OUTPUT
BR
YL
VI
RD
BK
PILOT
SV9500
BR
BR
CAP.
S
1
71
72
T
W
I
N
2
C
W
Y
G
R
L
P
ROS
*
GY
W
F1
GND
R
D1
HUM
EAC
N
N
CIR
BLWR
4C
3
2
X
NEUTRAL
1
1
N
CONT
XFMR
SEC
UNUSED
MOTOR
LEADS
HEAT
COOL
5
4
1
2
1
2
1
2
1
2
3
2
1
Honeywell
ST9120C-16
CU
SEE NOTE 6
SEE NOTE 7
HORIZONTAL GAS FURNACE WITH HONEYWELL ST9120C FAN TIMER & SV9500 SMART VALVE
NOTES:
1. Make field power supply connections to black and white wires
capped with orange wire nuts.
2. WARNING---unit must be grounded. Wiring must conform to N.E.C. and
local codes.
3. If any of the original wire, as supplied with the furnace, must be replaced,
it must be replaced with wiring material having a temperature
rating of at least 105
°
C and be a minimum of 16 gage AWG copper strand wire.
4. Connect required motor lead to heat terminal on circuit board to deliver a
temperature rise within the range specified on the rating label. Connect
unused leads to the unused motor leads.
5. Set the heat anticipator on the thermostat at .40 amps.
6. Low voltage fuse 5 amp automotive type littlefuse 257005 or buss ATCS.
7. Both EAC and HUM terminals are 115V.
W
C
Y
R
MED
LOW
HIGH
MED
LOW
HIGH
MEDIUM SPEED
HEAT CONNECTION
N2
LOW SPEED
HEAT CONNECTION
N2
MEDIUM SPEED
HEAT CONNECTION
N2
HEAT
COOL
UNUSED MOTOR
LEAD
CONSTANT
FAN
SWITCH
FAN
SWITCH
HEAT
COOL
MED
LOW
HIGH
LINE V
24V
LINE V
24V
JUMPER
11