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12 Inch Motorized Damper 24 or 120 Volt
The MD Series Motorized Dampers come in either
24 or 120 Volt, normally closed models. The 120 Volt model is supplied with an
end switch rated for a 10-amp load. The end switch permits sequencing of
operation for a remote fan after damper is opened, enabling use of remote fans
to ventilate selectively individual bathrooms, laundry rooms and kitchens.
These motorized dampers can also be used to
control the sequencing of outside makeup or fresh air in forced air handling
systems.
Possible controls for use with zoned
ventilation systems include: manual spring wound time delay, electronic time
delay, cycle timer, programmable timers, occupancy and humidity sensing
switches.
Flow Control Adjustment:
- MINIMUM FLOW ADJUSTMENT: Minimum airflow can
be set by loosening the bolt on the shaft and turning the damper from the
fully closed position to leave a gap between the gasket and the damper blade .
Retighten the bolt with the damper at the desired opening.
- MAXIMUM FLOW ADJUSTMENT (Available only on
models without end switch) Maximum airflow can be set by loosening the
flow control adjustment bolt. When set , this bolt acts as a stop, limiting
the opening of the damper blade. It is preset at the factory to open fully. To
adjust, loosen the bolt lock nut, turn the adjusting bolt to the desired
setting, and retighten the bolt lock nut. Activate the motor after each
adjustment to properly reset the motor and damper blade
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Specifications: A: 12"
B: 12"
C: 14"
D: 4.38"
24 Volt = 23 048 (does not have end switch)
120 Volt = 23 049 (has end switch)
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