16
ZONE DAMPERS
The rectangular zone dampers are available in low, medium and heavy duty pressure ratings. For systems up to 5 tons or with .5” ESP blower
capacity, use low pressure rated dampers. For systems up to 7.5 tons or with a 1.0” ESP blower capacity, use medium pressure rated
dampers. For systems over 7.5 tons or up to 1.75” ESP blower capacity, use heavy duty rated dampers.
RECTANGULAR LOW PRESSURE ZONE DAMPERS
(TREC W x H)
Zonex Systems
rectangular low pressure dampers can be used for systems up
to 5 tons with a maximum differential static pressure of 0.5”. These are two
position, spring open, power close dampers. They are constructed from heavy
duty galvanized steel. The damper is a single blade type that slips into a 2-1/2”
wide cutout in the existing duct and attaches with screws via a duct mounting
plate. The duct mounting plate is 5” wide. The drive assembly supports a
synchronous 24V AC 60Hz 12VA motor and terminal board. The motor is
designed for continuous full stall operation. Special winding and heavy duty
gearing provide for long motor life and easy spring open operation. A cross pin
on the motor shaft provides positive direct drive to the damper shaft without
a coupling or set screws. Motor drive time from full open to full close is 30
seconds. A red LED will be illuminated on the damper terminal board to
indicate when the damper is being powered closed. The LED will remain on
when the damper is fully closed and cycle off when the damper is opening or
in the full opened position. Since this is a spring open damper, in the event of
power failure the damper fails to the full open position.
RECTANGULAR MEDIUM PRESSURE ZONE DAMPERS (101MRTD W x H)
Zonex Systems
rectangular medium pressure dampers are recommended for systems under 7.5 tons with a maximum differential static pressure of 1”.
These are power open, power close dampers. They are constructed from heavy duty aluminum and stainless steel. The damper is an opposed blade
type that slips into a 3-1/4” wide cutout in the existing duct and attaches with screws via a duct mounting plate. The duct mounting plate is 5” wide.
Power consumption is 6VA. The motors are designed for continuous full stall operation. Special winding and heavy duty gearing provide for long
motor life.
RECTANGULAR HEAVY DUTY ZONE DAMPERS
(101CD W x H)
Zonex Systems
rectangular heavy duty dampers are recommended for systems
7.5 tons or larger with a maximum differential static pressure of 1.75”. These are
power open, power close dampers made of 20 gauge “snap-lock” steel frame
with S and Drive duct connections. Allow a 16” gap in the duct for the damper.
Formed steel blade stops incorporate a gasket for quiet operation and improved
structural rigidity. Rectangular dampers under 10” in height incorporate a
single blade design. Dampers 10” or over use opposed blade design. A full stall
motor, drawing 6 VA and a relay board control the damper position.
MEDIUM PRESSURE (101MRTD W x H) AND
HEAVY DUTY (101CD W x H) RECTANGULAR DAMPERS
LOW PRESSURE (TREC W x H) RECTANGULAR DAMPER
RECTANGULAR ZONE DAMPERS
