Submittal Sheet

©2020 Zonefirst® | 6 Aspen Drive – Randolph, NJ. 07869 | Telephone: [phone] | Fax: [phone]
www.zonefirst.com | [e-mail]
Controlling Your Comfort Room by Room
SPECIFICATIONS
Electrical Rating 6.5 Watts, 7VA
Motor Voltage 24 Volts VAC +- 20% 50/60 Hz
Output Direct Drive 5/16”. deep coupler/set screw
to 5/16” damper blade shaft.
Stroke Speed
Torque Rating Power Start: 70in-oz., Power Finish: 40in-oz. 30 Seconds
Spring Start: 60in-oz., Spring Finish: 30in-oz. 20 Seconds
Temperature Limits 0°F to 150°F Operating, -20°F to 175°F Storage (Ambient)
Shipping Weight 1.5 lbs. (680G)
The above specifications are nominal and conform to generally acceptable industry standards.
ZONEFIRST is not responsible for damages resulting from misapplication or misuse of its products.
Spring Return Damper
Motor Actuator
Model MSS
The spring return damper motor actuator is designed to
operate automatic air control dampers.
This actuator features a synchronous hysteresis motor
designed for long life with unique “lost motion” drive to
protect the gear train from closing shock. THE MSS has
been cycle tested to over 250,000 cycles and has been
specifically designed for silent operation. Many spring
return motors have a loud gear noise as the damper spring
returns to its normal position. The MSS has a patented
design air brake slowing the spring return motion to
minimize the noise.
This actuator is made for easy replacement. The MSS is
directly coupled to a 5/16” damper blade shaft via
coupler and set screw. The wiring connections are made
with wire nuts to the wire leads that pass thru the plastic
strain relief grommet.
Minimum Position Adjustment
The minimum position screw can also be used to
determine the damper position. The setscrew is aligned
with the position of the damper blades. When the
setscrew is in line with the duct, pointed at the Closed on
the minimum position label, the damper is actually open.
When it is hidden behind the motor and stopped against
the anti-rotation post on the motor, it is Closed or at the
minimum position.
Note: Damper minimum position adjustment does not
necessarily indicate damper position.