EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646 E-Mail- [email protected]
Contents:
(1) MA-ND3 Motor Actuator
(1) ND/ND2 Anti-Rotation Bracket
(1) URD/RDN
(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
Anti-Rotation Bracket
(1) ND3 Anti-Rotation Bracket
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.
P/N 090376A0152 REV. E Copyright C EWC Controls 2004 All Rights Reserved -- AN-152
Installation and service should be performed by
qualified personnel only. Follow all local &
national, mechanical & electrical codes &
ordinances.
BEFORE YOU BEGIN
-Read all instructions and figures pertaining to the
model actuator you are replacing.
-Gather the n
ecessary tools to complete the
replacement.
-Disconnect 24vac power supply.
-Tag and remove low voltage wires from existing
actuator.
MODEL URD & RDN STYLE DAMPERS
(Figure 2)
-
-Using 1/4” nut driver, Insert 1/2” self-tapping
screws into proper holes and tighten.
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
.
-Follow instructions for
Replacing Motor
Actuator
for URD or RDN on pages 2 and 3.
CONTROLS INC.
C
EW
Excellence Without Compromise
MANUAL
GEAR
RELEASE
MA-ND3
CLOSED OPEN
UL
R
C
US
LISTED
94D5
TEMP.IND.&
REG.EQUIP.
CLASS 2 SUPPLY
17 in-lb (2Nm)
30...45s
1 4 6
24VAC
50/60Hz
3.5VA 2W
COM PO PC
ACTUATOR
CLAMP
V-BOLT
MANUAL
GEAR
RELEASE
Figure 1
: New MA-ND3 Motor Actuator
Figure 2
: URD/RDN Anti-Rotation Bracket Assembly
MA-ND3
URD/RDN
ANTI-ROTATION
BRACKET
1/2” SELF-
TAP SCREWS
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
.
ATTACHING BRACKET TO ACTUATOR
AN-152 - Model MRK
- Motor Actuator Replacement Kit
1
