20
A
A
B
B
RC
MC
RO
E
Y
W/OB
C
R
C
R
ZN1
ZN2
ZN3
ZN4
ZN5
ZN6
ZN7
ZN8
ZN9
ZN10
RUN OPEN
RUN CLOSED
HP
SLAVING ZONE DAMPERS
Up to three dampers can be directly controlled by one zone damper control board. To wire two or three dampers for a zone,
use the following wiring diagram. Remember to size the power transformer for the total number of zone dampers in the system,
2va per damper.
When slaving more than three zone dampers, use the following diagram. An additional 24-volt transformer and control relays are
needed for these applications.
Note:
All slave dampers need to be model STMPD / STCD
SLAVING MORE THAN THREE ST SERIES 3-WIRE ZONE DAMPERS
SLAVING UP TO THREE ST SERIES 3-WIRE ZONE DAMPERS
ZONE DAMPER 2
MC
RO
RC
STMRX or STCRX damper
STMPD or STCD damper
ZONE DAMPER 2
MC
RO
RC
ZONE DAMPER 3
MC
RO
RC
24 VOLT
TRANSFORMER
CONTROL
RELAY
SPST
CONTROL
RELAY
SPST
ZONE DAMPER 1
MC
RO
RC
STMPD or STCD damper STMPD or STCD damper
STMPD or STCD damper
ZONE DAMPER 3
MC
RO
RC
STMPD or STCD damper
MC
RC
RO
AC
TU
AT
OR
A
A
B
B
RC
MC
RO
E
Y
W/OB
C
R
C
R
ZN1
ZN2
ZN3
ZN4
ZN5
ZN6
ZN7
ZN8
ZN9
ZN10
RUN OPEN
RUN CLOSED
HP
STMRX or STCRX damper
MC
RC
RO
AC
TU
AT
OR
When slaving more than three zone dampers, use the following diagram. An additional 24-volt transformer and control relays are
needed for these applications.
Note:
All slave dampers need to be model TR / TREC and are 12va per damper.
SLAVING MORE THAN THREE 2-WIRE ZONE DAMPERS
ZONE DAMPER 2
M
M
ZONE DAMPER 3
M
M
24 VOLT
TRANSFORMER
CONTROL
RELAY
SPST
ZONE DAMPER 1
M
M
TR or TREC damper
TR or TREC damper
TR or TREC damper
A
A
B
B
RC
MC
RO
E
Y
W/OB
C
R
C
R
ZN1
ZN2
ZN3
ZN4
ZN5
ZN6
ZN7
ZN8
ZN9
ZN10
RUN OPEN
RUN CLOSED
HP
TRX or TREX damper