INSTALLATION INSTRUCTIONS
62-0182
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
MS4120F, MS4620F, MS8120F
Fast-Acting, Two-Position Actuator
TANDEM MOUNTING
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
NOTES:
— Individual actuator specifications do not change
when tandem mounted. For specification details
see form 63-2584.
— A tandem mounted pair of actuators provides a
driving/spring return torque of 350 lb-in. and a
maximum stall torque of 850 lb-in. (96 N•m).
Required Accessories (not supplied with actuator):
205649 Mounting Bracket.
1/4 in.-20 bolt, 1 in. long, SAE grade 5 minimum.
1/4 in.-20 nut, SAE grade 5 minimum.
Location
MS4120F, MS4620F, and MS8120F DCA are designed to
operate a damper by driving the shaft in either clockwise
or counterclockwise direction. Each actuator housing
has two slots on the bottom, either of which, with a 205649
Mounting Bracket, secures it flush to a damper box.
NOTE: When mounted correctly, these slots allow actuators
to float without rotating relative to the damper shaft.
Preparation
Before mounting actuators, determine the damper opening
direction for correct spring return rotation. The actuators can
be mounted to provide clockwise or counterclockwise spring
return.
Determine Appropriate Mounting Orientation
See actuator instructions (form 63-2584) for mounting
orientation details.
IMPORTANT
Be sure to mount both actuators to spring return in
the same direction.
Measure Shaft Length
IMPORTANT
Minimum required shaft length for tandem mounting
is 4 in. Honeywell recommends a shaft length of at
least 6-1/4 in.
If the shaft is less than 6-1/4 in. long, the shaft coupling must
be located between the damper and actuator housing. If the
shaft length is more than 6-1/4 in., the shaft coupling may be
located on either side of the actuator housing.
If the coupling must be moved from one side of the actuator to
the reverse, follow the instructions provided with the actuator
(form 63-2584).
Mounting
CAUTION
Equipment Damage Hazard.
Tightly securing an actuator can damage the
actuator and reduce the output torque.
Mount each actuator to allow it to float independently
along its vertical axis.
CAUTION
Device Malfunction Hazard.
Improper shaft coupling tightening causes device
malfunction.
Tighten shaft coupling with proper torque to prevent
damper shaft slippage.
CAUTION
Actuator Damage Hazard.
Using actuator as shaft bearing causes device
damage.
Use actuator only to supply rotational torque. Avoid
any side loads to actuator output coupling bearings.
