Model MRK - Motor Actuator Replacement Kit
MODEL RDN STYLE DAMPERS
(Figure 5)
-Align Damper Blade Shaft set screw with access
opening on existing motor actuator.
-Using a 3/32” allen wrench, loosen the set screw
on the Damper Blade Shaft.
-Remove the four (4) phillips head screws holding
the existing motor actuator to the damper.
-Pull the existing motor actuator straight off.
-Using the Manual Gear Release on the New
Actuator/Bracket Assembly, position the Actuator
Clamp to the far RIGHT. (CLOSED Position)
-Loosen the nuts on the V-bolt so the Shaft
Adaptor will slide thru easily.
-On the RDN damper, position the set screw on the
Damper Blade Shaft so it is facing UP and insert
the RDN mating end of the Shaft Adaptor fully
into the blade shaft with the flat side UP.
-Using 3/32” allen wrench, tighten the set screw
on the Damper Blade Shaft.
-Align Actuator/Bracket Assembly and mounting
holes with Shaft Adaptor and mounting brackets.
-Insert Philips head screws thru mounting
brackets into the Anti-Rotation Bracket and
Tighten.
-Using a 5/16” nut driver, tighten theV-bolt to the
Shaft Adaptor.
Figure 5: RDN Motor Actuator Replacement Assembly
ACTUATOR/BRACKET
ASSEMBLY
RDN
DAMPER
DAMPER BLADE SHAFT
SHAFT
ADAPTOR
POSITION
SET-SCREW
FACING UP
ADAPTOR SHAFT-
RDN MATING
FLAT SIDE UP
MOUNTING
BRACKETS
MODEL ND/ND2 STYLE DAMPERS
(Figure 6)
-Remove the two (2) 11/32” actuator mounting
nuts holding existing motor actuator to damper
frame.
-Pull the existing motor actuator straight off.
-For ND2 dampers place one (1) of the supplied
11/32” hex nuts on each existing Mounting Post.
(Not necessary for older ND dampers).
-Using the Manual Gear Release on the New
Actuator/Bracket Assembly, position the Actuator
Clamp to the far LEFT. (OPEN Position)
-Loosen the nuts on the V-bolt so the Shaft
Adaptor will slide thru easily.
-On the damper, position the slot on the Damper
Blade Shaft vertically and insert Shaft Adaptor
fully into the Damper Blade Shaft.
-Align Actuator/Bracket Assembly and mounting
holes with Shaft Adaptor and mounting posts.
-Replace 11/32” hex nuts on mounting posts and
tighten.
-Using a 5/16” nut driver, tighten theV-bolt to the
Shaft Adaptor.
-Reconnect wiring.
-Reconnect wiring. Note: Refer to MA-ND3
Submittal sheet for proper wiring.
EWC
Controls
Inc.
385
Highway
33
Englishtown,
NJ
07726
800-446-3110
FAX
732-635-8646
E-Mail-
[email protected] 3**ACTUATOR CLAMP NOT SHOWN FOR CLARITY
