ST9120B,U UNIVERSAL ELECTRONIC FAN TIMERS
Connector/Wire Identification
6 pin
HEAT ON DELAY
HEAT OFF DELAY
ON
ON
1
1
2
30
60
120
SECONDS
SECONDS
SECONDS
CHECKOUT
OPERATE THE SYSTEM THROUGH AT LEAST ONE COMPLETE HEATING CYCLE AND COOLING CYCLE TO MAKE SURE THE SYSTEM OPERATES PROPERLY.
TROUBLESHOOT BY CHECKING FOR APPROPRIATE VOLTAGES AT THE
COOL SPEED CIRCULATING FAN. THE ST9120U,B SCHEMATICS SHOW INTERNAL SWITCHING TO CLARIFY OPERATION AND ASSIST IN TROUBLESHOOTING. SEE FIGS 5 AND 6.
1
DEFAULT SETTING SHOWN.
Fig. 10. Setting heat fan-on, heat fan-off, cool fan-on, and cool fan-off delay DIP switches.
69-2252EF—07
Table 6. ST9160 Jumper Plug (HPN 50034963-001) Connections.
J1 connector at ST9120B,U
6
5
4
3
2
1
Fig. 9. ST9160 jumper plug 50034963 schematic.
DELAY
TWIN
3
2
3
2
3
150
60
SECONDS
SECONDS
1
2
NOT CONNECTED
3
NOT CONNECTED
4
NOT CONNECTED
5
NOT CONNECTED
6
50034963
NEUTRAL
UNUSED
HUM
IND
L1
CONT
EAC
COOL
HEAT
COOL ON DELAY
2
3
4
4
180
4
30
SECONDS
SECONDS
SECONDS
ST9120U, ST9120B
TERMINALS CONTROLLING THE COMBUSTION BLOWER AND HEAT AND
12
Connect To...
M27729
ON
OFF
1
2
3
4
5
COOL OFF DIP SWITCH (5)
COOL ON DIP SWITCH (4)
HEAT OFF DIP SWITCH (2 AND 3)
HEAT ON DIP SWITCH (1)
COOL OFF DELAY
5
5
30
60
SECONDS
SECONDS
1
M27730B