ST9120B,U UNIVERSAL ELECTRONIC FAN TIMERS
TO 115/230 VAC
POWER SUPPLY
FUSE
L1 (HOT)
1
L2 (N)
2
115/230 VAC
TRANSFORMER
24 VAC
DENOTES LINE VOLTAGE WIRING
DENOTES LOW VOLTAGE WIRING
1
FOR 115 VAC / 50, 60 HZ INSTALLATIONS, THERE MUST BE 115 VAC CONNECTED TO L1 (HOT) ON ST9120U, ST9120B.
FOR 230 VAC / 60 HZ INSTALLATIONS, THERE MUST BE 115 VAC BETWEEN L1 (HOT) AND APPLIANCE CHASSIS.
FOR 230 VAC / 50 HZ INSTALLATIONS, USE ONLY WITH SMART VALVE RATED FOR THE SAME LINE VOLTAGE PARAMETERS.
2
APPLIANCE CHASSIS MUST HAVE RELIABLE CONNECTION TO EARTH GROUND.
3
JUMPER PLUG MUST BE ATTACHED TO J1 CONNECTOR.
CONNECT ONLY IF CONTINUOUS SPEED IS AVAILABLE AND USED.
4
5
CONNECT ONLY IF CONTINUOUS SPEED IS NOT USED
Fig. 6. Typical ST9120B,U wiring connections in ST9160 system with SV9540/SV9640 SmartValve™ Control.
69-2252EF—07
HUMIDIFIER
5
J3
J1
C
3
X
C G
C G Y W R
THERMOSTAT
AIR
CLEANER
FAN
4
HI
ML
MH
LO
C
R
24VAC
DATA
NEUTRAL
L1
Y W R
10
PRESSURE
SWITCH
STARTING
INDUCER
CAP
HOT
NEUTRAL
SV9540;
SV9640
C1
C2
C3
2
LIMIT
ROLLOUT
SWITCH
SWITCH
Q345
IGNITER-
SENSOR
M27724A