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Les langues disponibles
Les langues disponibles
ST9101
HEAT
HEAT
COOL
COOL
CONT
ACC
---
DI
S
S1 to S3
M1
UNUSED MOTOR LEADS
M2
UNUSED MOTOR LEADS
N
N
X
X
C
C
---
SPEED UP
---
Z1
---
Z2
---
---
Thermostat Terminals
R
R
Y
Y
C
C
W
W
G
G
* ACC terminal is used in ST9101 systems, which use the same fan speed for both heating and cooling. In order to use
the ST9120B,U to replace ST9101 devices in this type of system, the fan connection that originally was connected to
ACC on the ST9101 needs to be connected to both heat and cool connections on the ST9120B,U.
**TWIN terminal is used to interconnect two ST9120B,U units to operate blower outputs simultaneously. Twinning at
new ST9120B,U control is not backwards compatible with legacy controls.
ST9141 to ST9120B,U Wiring
Conversion Instructions
1. Turn off power to appliance and carefully remove
each wire and connect directly to the new
ST9120B,U control board before removing the
existing control. Use Table 1 to determine the
proper ST9120B,U terminal for each corresponding
ST9141 connection. Be careful to directly connect
the new terminal or label each wire prior to removal
from original board.
2. Unplug the 9-pin connector and plug existing wiring
harness directly into the 9-pin connector found on
the ST9141 wiring adapter 50034962. See Fig. 8
and Table 5 for further wire harness adapter
description.
3. Plug the 6-pin connector found on the ST9141 wir-
ing adapter directly to the open 6-pin connector on
the new ST9120B,U control board.
4. Take the gray wire on the ST9141 wiring adapter
and connect to the LIM quick connect terminal on
the ST9120B,U.
5. Take the brown wire on the ST9141 wiring adapter
and connect to the PRSW quick connect terminal
on the ST9120B,U.
Table 1. ST9101 to ST9120B,U Wiring Conversions.
ST9120
HEAT
COOL
CONT
---
DI
S1 to S3
UNUSED MOTOR LEADS
UNUSED MOTOR LEADS
N
XI
C
SPEED UP
Z1
Z2
---
R
Y
C
W
G
ST9120B,U UNIVERSAL ELECTRONIC FAN TIMERS
ST9141
HEAT
COOL
CONT
---
---
L1
M1
M2
N
24 VAC
COM
---
TWIN H
TWIN C
DATA
R
Y
C
W
G
6. Identify the model number of the board being
replaced and set the dip switches based on Table 3.
7. Check proper connection using Fig. 4.
ST9160 to ST9120B,U Wiring
Conversion Instructions
1. Turn off power to appliance and carefully remove
each wire and connect directly to the new
ST9120B,U control board before removing the
existing control. Use Table 1 to determine the
proper ST9120B,U terminal for each corresponding
ST9160 connection.
2. Unplug the 6-pin connector and plug it into the J3
connector found on ST9120B,U.
3. Plug the jumper plug into the J1 connector at
ST9120B,U.
4. Identify the model number of the board being
replaced and set the dip switches based on Table 3.
5. Check proper connection using Fig. 5 or 6.
LED Diagnostic
The ST9120 control provides the following status
information and diagnostic troubleshooting code
sequence as shown in Table 2.
3
ST9160
ST9120B,U
HEAT
COOL
CONT
* for systems with one
ON fan speed (see
note below)
IND
L1
UNUSED
UNUSED
N
X
C
---
** TWIN (see note
below)
** TWIN (see note
below)
DATA
R
Y
C
W
G
69-2252EF—07
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