Note: All zone dampers default to the "OPEN"
position after a purge delay has occurred.
Dampers also default “OPEN” during
changeover & short cycle delays, and when
all zone demands are satisfied, and no
signals are detected from the thermostats.
DAMPER WIRING AND CONFIGURATION
DAMPER WIRING AND CONFIGURATION
Common 24vac
Constant 24vac HOT
24vac to Open a damper(s)
24vac to Close a damper(s)
Terminal M1
Terminal M2
Terminal M4
Terminal M6
ZONE MODULE DAMPER
MOTOR TERMINAL BLOCK
DESIGNATION & FUNCTION
.
.
2 Wire Spring Return Motor Wiring
EWC Controls
Spring Return Motor Wiring
A Spring Open Damper is wired to M1 & M6
A Spring Close Damper is wired to M1 & M4
M1
M2
M4
M6
{
MA-ESR
NC NO C M M
Auxilary
SPDT
End Switch
Dry Contacts
Rated for
24vac only
M1
M2
M4
M6
REFERENCE THESE DIAGRAMS PRIOR TO
INSTALLATION AND POWER WIRING. DOING SO WILL
SAVE TIME AND LABOR ON THE JOB SITE.
Patented Optical
Damper Motor Actuators
Figure 31.
Figure 33.
Figure 34.
All Models SMDL & BMDL Damper Wiring
2
4
1
M1
M2
M4
M6
All Models MA-ND & MA-URD Damper Wiring
4
6
1
Patented Optical
Damper Motor Actuators
Figure 32.
M1
M2
M4
M6
On all these dampers and most older style
dampers, including competitor’s dampers,
always wire up number to number.
Contact EWC Controls Technical Support
when you are on the job site for assistance
with damper wiring.
NOTE: Some older style dampers cannot be
wired in parallel. Do not overload your
transformer!
Multiple MA-ND & MA-URD
Damper Wiring on a Single Zone
4
6
1
M1
M2
M4
M6
4
6
1
4
6
1
Multiple dampers
wired to operate
together on a single
zone
Figure 35.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]
Either one
Not both
Z
O
N
E
Z
O
N
E
Z
O
N
E
Z
O
N
E
Z
O
N
E
19
