Overview of Primary Product
Table Of Contents
Terminal M1 - Common
Terminal M2 - Constant 24 VAC
Terminal M4 - 24 VAC to open damper
Terminal M6 - 24 VAC to close damper
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646 E-Mail- info@ewccontrols.com
8
D
M
P
R
1
M1
M2
M4
M6
RDN
Motor Wiring
SMDL/BMDL
Motor Wiring
The damper motor terminals (M1, M2,
M4 and M6) will accommodate
practically any 24VAC motorized
damper. Damper motor selection
should be limited to motors with less
than .5 amp current draw.
Damper
Wiring
Figure 13. A zone controlling two dampers.
Controlling 3 or
More SMD/BMD
Dampers From
One Zone
Figure 14. A zone controlling four SMD/BMD dampers using the R4 relay.
D
M
P
R
1
M1
M2
M4
M6
4 4 4 4
5 6 7 89 10 11 121 2 3 4
13
14
R4
Relay
Coil
1 1 1 1
5 5 5 5
2 2 2 2
6 6 6 6
3 3 3 3
Z Z Z Z
X X X X
Jumper
Wire
TRANSFORMER
24V, 40VA
Numbers in circles below refer to the terminal numbers on the socket for the R4 relay.
R4 Type Relay
A relay can be added to the system to
control more than two dampers per
zone. Figure14 shows a relay used to
control four dampers using the "R4"
relay which has four sets of contacts (4-
pole) with both normally open and
normally closed contacts. If more than
four dampers are required on a single
zone, a second R4 relay must be used.
Control Panel
A single 24VAC, 40VA transformer can
power the UZC3 panel and one UEX-22
expansion panel with one damper on
each zone only. It is important that the
24VAC terminals 1 and 2 be wired the
same as shown in figure 16.
Spring Return
Motor Wiring
24VAC Power
Wiring
Figure 16. 24VAC power wiring.
.
1
1
2
2
24
VAC
Line
Voltage
24
VAC
TRANSFORMER
24V, 40VA
UEX-22 Expansion Panel
UZC3 Main Panel
Figure 15 shows how to wire a spring
return damper. A normally open style
damper is wired to M1 & M6. Normally
closed style damper is wired to M1 & M4.
Figure 15. Wiring spring return damper.
Spring Return Motor wiring
D
M
P
R
1
M1
M2
M4
M6
MA-ESR
{
NDSR
URD-ESR
IMPORTANT: If
the auxillary relay
is used, the
UZC3C must not
share the first
transformer!
1 - Common
2 - Hot