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10 VAV-PRC003-EN
Features and
Benefits
VariTrac Zone Dampers
VariTrac zone dampers are fully-
modulating, pressure-dependent VAV
devices. The dampers control zone
temperature by varying the volume of
air flowing into a space. Each VariTrac
damper has a control box with a VAV
control board and actuator enclosed.
The dampers are designed to operate in
static pressures up to 1.75 in. wg.
Round Zone Damper
• Round dampers are available in 6, 8, 10,
12, 14, and 16 inch diameters
• Heavy gage galvanized steel cylinder
with rolled bend for high structural
integrity and corrosive resistance
• Metal-to-metal seal provides tight
shutoff
• 90° blade rotation for a wide control
range and stable operation
• Aerodynamic blade design provides
constant torque for stable operation at
high velocity
• Rated up to 2000 fpm at 1.75" of static
pressure
Rectangular Zone Damper
• Rectangular dampers are available in
sizes 8 x 12, 8 x 14, 8 x 16, 10 x 16,
10 x 20, and 14 x 18 inches
• Heavy gage G90 galvanized steel
frame assembled by a mechanical
joining process
• Single-ply, heavy gage G90 galvanized
steel blades
• Linkage has high impact ABS gears,
and is 3" nominal diameter
• Factory-installed 24 VAC direct-coupled
actuator
• Rated up to 2400 fpm at 2" of static
pressure
Figure 9. VariTrac rectangular and round zone dampers with UCMs
Unit Control Module
A unit control module (UCM) is the
individual zone controller for the
VariTrac air damper and is mounted on
each zone damper. The unit controller
continually monitors the zone
temperature to maintain space
temperature. The UCM varies the
damper position as needed to meet
zone setpoints and communicates
current space requirements and
system operating modes to the CCP.
The UCM can also control local heat.
Local heat may be duct- or space-
mounted, and can be staged electric,
pulse-width modulating electric, and
modulating or two-position staged
hot water.