EWC Controls ULTRAZONE MRK Application Note

Contents:
(1) MA-ND3 Motor Actuator
(1) ND/ND2 Anti-Rotation Bracket
(1) URD/RDN Anti-Rotation Bracket
(1) ND3 Anti-Rotation Bracket
(1) Shaft Adaptor
(4) 11/32 hex nuts
(2) #8 x 1/2" self tap screws
(2) Flat washers
(4) #6 phillips screws
Tools Required:
1/4" Nut Driver
5/16" Nut Driver
11/32" Nut Driver (ND/ND2)
3/32" Allen Wrench (RDN)
Medium Phillips Screwdriver
Precision Pocket Screwdriver
The New & Versatile MRK Damper Motor
Replacement Kit is compatible with original ND &
ND2 Rectangular Dampers. It also works with any
URD damper ever produced, including RDN style
dampers.
Installation and service should be performed by
qualified personnel only.
national, mechanical & electrical codes &
ordinances.
ACTUATOR
CLAMP
MA-ND3
17 in-lb (2Nm)
30...45s
LISTED
94D5
C
TEMP.IND.&
REG.EQUIP.
CLASS 2 SUPPLY
CLOSED OPEN
Figure 1: New MA-ND3 Motor Actuator
P/N 090376A0152 REV. E Copyright C EWC Controls 2004 All Rights Reserved -- AN-152
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
AN-152 - Model MRK
Follow all local &
V-BOLT
Excellence Without Compromise
EW C
MANUAL
CONTROLS INC.
MANUAL
GEAR
GEAR
RELEASE
RELEASE
24VAC
50/60Hz
3.5VA 2W
U L
US
R
COM PO PC
1 4 6
- Motor Actuator Replacement Kit
BEFORE YOU BEGIN
-Read all instructions and figures pertaining to the
model actuator you are replacing.
-Gather the necessary tools to complete the
replacement.
-Disconnect 24vac power supply.
-Tag and remove low voltage wires from existing
actuator.
ATTACHING BRACKET TO ACTUATOR
MODEL URD & RDN STYLE DAMPERS
(Figure 2)
- Keeping the folds on the Anti-Rotation Bracket
away from the Motor Actuator, align holes on Anti-
Rotation Bracket with holes on rear of MA-ND3.
-Using 1/4" nut driver, Insert 1/2" self-tapping
screws into proper holes and tighten.
-Follow instructions for Replacing Motor
Actuator for URD or RDN on pages 2 and 3.
URD/RDN
ANTI-ROTATION
BRACKET
Figure 2: URD/RDN Anti-Rotation Bracket Assembly
MODEL ND & ND2 STYLE DAMPERS
(Figure 3)
-Lay motor actuator on a bench with the back plate
facing up.
-Place one (1) washer over the two (2) lower
mounting holes.
-Keeping the folds on the Anti-Rotation Bracket
towards the motor actuator, align holes on Anti-
Rotation Bracket with holes and washers on rear
of MA-ND3.
E-Mail- info@ewccontrols.com
MA-ND3
1/2" SELF-
TAP SCREWS
1