EWC Controls ULTRA-TALK 3000 Technical Bulletin page 15

DAMPER WIRING
Note:
The 100mA Damper Auto-Reset Circuit Breaker
(protecting each zone damper output) may trip, if too
many dampers (or incompatible dampers) are connected
to a single zone!
You can connect up to three (3) Model ND, URD, or
SID type dampers to a single terminal block without
tripping the breaker, regardless of the ambient
temperature.
Note:
You can select all zone dampers to default
"OPEN" or "CLOSE" during IDLE periods.
Idle periods are defined as:
* The HVAC system is idle and not running.
* Caution: Inverter based "Oil Return "mode runs without a
zone thermostat demand!
* All Fan/Purge functions have timed out.
* All zone thermostat demands are satisfied.
* No zone thermostat demands are detected.
Zone thermostat demands are defined as:
* Heating
* Cooling
* Fan Only / Circulate
* Humidification / De-humidification
ZONE DAMPER MOTOR
TERMINAL BLOCK
DESIGNATION & FUNCTION
24vac Power to Open a Damper
Terminal PO
Terminal PC 24vac Power to Close a Damper
Terminal C
24vac Common (Neutral)
Figure 4
Genuine ND, URD & SID Damper Wiring
with MA-ND5 or MA-15S motors
Figure 5a
15
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
Resist the urge to wire damper motors in series, jumping
from motor to motor to motor. Wiring multiple motors in
parallel (as shown below in Figures 5b and 5c) reduces
the possibility of loose connections, high resistance and
voltage drop.
On these dampers and most older style dampers,
always wire up number to number or by terminal
designations. PAY ATTENTION TO YOUR WIRING!
(C to Com)(PO to PO)(PC to PC) (C=1) (PO=4) (PC=6)
Two ND, URD, SID Dampers
on a Single Zone Terminal Block
Three ND, URD or SID Dampers
on a Single Zone Terminal Block
D
C
A
M
PC
P
E
PO
R
D
PO
A
M
PC
P
E C
R
Figure 5c
PARALLEL versus SERIES wiring
E-Mail- info@ewccontrols.com
D
PC
A
M
PO
P
E
C
R
Figure 5b
C
PC
PO
It is highly recommended
to specify genuine Ultra-
Zone ND, URD or SID
dampers.
EWC power open &
power close dampers
draw very low current
(26mA) produce 18"lb of
torque at 35second
travel time, and have
LED position indicators.
No other residential zone
damper is stronger, more
efficient or as reliable.