Damper Wiring, Damper Testing And Power Supply Solutions; Uzc4 Recommended Power Solutions - EWC Controls Ultra-Zone UZC4 Technical Bulletin

DAMPER WIRING, DAMPER TESTING AND POWER SUPPLY SOLUTIONS

Unlike previous models, the UZC4 series allows "Damper Motor Power Isolation" on the Main and Expansion
modules. The Main Module's motor blocks can be isolated only if necessary, but the Expansion module motor blocks
must be powered by a separate transformer. This advanced design provides automatic 2.5amp over-current
protection for each Expansion module motor block and allows a maximum 60va transformer to be connected. This
means that you can directly connect a theoretical maximum of 12 Genuine ND/URD dampers to a single 2 zone
expansion module. Now you no longer have to isolate & power up multiple dampers using field installed relays. The
Expansion modules provide the isolation for you. See the diagram below for typical wiring solutions for dampers.
Typical damper power wiring for a ZXM2 Expansion Module.
ND / URD's/SID's
Number of Dampers Directly Connected to Main Module
@ 1.5 va
per damper
W/MA-ND5
4
40va
10
50va
12 50va
6 40va
60va
8 14
40va
Non-inherently current limiting transformers must have field provided over-current protection on the secondary 24 vac output. The table values
provided pertain to genuine ULTRAZONE Dampers and Competitors typical 24 vac Spring loaded dampers. Included in these VA load ratings are the
correct number of thermostats, the UZC4 Zone System, and a 5% field factor. Spring loaded dampers draw higher currents & require more power.
ND / URD / SMD / BMD Dampers - Connect 24vac common to terminal 1 and 24vac hot to terminal 4. Damper should
Open. Remove 24vac hot from terminal 4 and apply to terminal 6. Damper should Close
SR /SRE Power Close / Spring Open Dampers - Connect 24vac common & hot to the two motor (M) terminals.
Damper should Close. Remove 24 vac hot. Damper should Open.
SR /SRE Power Open / Spring Close Dampers - Connect 24vac common & hot to the two motor (M) terminals. Damper
should Open. Remove 24vac hot. Damper should Close.
SERVICE NOTE: Additional power for adding dampers to the main UZC4 module, is accomplished by cutting the "J2" jumper and powering
MXR & MXC with a separate 24vac 40va power transformer. These terminals are not to be used to power up expansion modules.
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EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
A single damper on the first expansion zone
and three dampers on the next. Your
actual number of dampers per zone may vary.

UZC4 Recommended Power Solutions

16
75va
18
75va
75va
20
T E S T I N G D A M P E R MOTORS
C
H
Spring Types
@ 8 - 10 va
per damper
Use class 2 UL
Listed 1585
4 40va
inherently
current limiting
6
50va
transformers
8
only! 50va
L2
To Line Voltage
Provide over current
protection
L1
Separate 24 vac
ZXM2 MODULE
Transformer
60va MAX
THERMAL
CIRCUIT
BREAKER
Number of Dampers Directly Connected to Main Module
10
60va
12 60va
75va
14
E-Mail- info@ewccontrols.com
MXR
MXC
F1
M6
D
M
M4
P
M2
R
M1
D
M6
M
M4
P
M2
R
M1
16 75va
18
100va
100va
20