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TO 115/230 VAC
POWER SUPPLY
L1 (HOT)
L2 (N)
24 VOLT
COMMON
24 VOLT
HOT
EFT
OUTPUT
24 VOLT
THERMOSTAT
OR PRESSURE
SWITCH
SV9500
HOT SURFACE
IGNITION CONTROL
PRESSURE SWITCH
DENOTES LINE VOLTAGE WIRING
DENOTES LOW VOLTAGE WIRING
Fig. 2. Typical ST9120B,U wiring connections in ST9120 system with SV9500/SV9501 SmartValve™ Control.
FUSE
ROLLOUT
LIMIT
SWITCH
SWITCH
J1
C
ST9120B,U UNIVERSAL ELECTRONIC FAN TIMERS
INDUCER
HUMIDIFIER
2
J3
STATUS
FUSE
X LIM PRSW Y
C
C
C
THERMOSTAT
1
CONNECT ONLY IF CONTINUOUS SPEED IS AVAILABLE AND USED.
2
CONNECT ONLY IF CONTINUOUS SPEED IS NOT USED.
7
AIR CLEANER
1
DELAY
TWIN
G
Y
W
R
R
G
Y
W
STARTING
FAN
CAP
HI
ML
MH
LO
115/230 VAC
TRANSFORMER
24 VAC
M27705
69-2252EF—07
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