Brochure

5
The way a typical variable air volume (VAV) application works
is that the rooftop unit provides airflow with a constant
temperature. The damper actuator in each VAV terminal
box controls the temperature in its zone by opening and
closing a damper.
What this means is that the actuator is constantly being
repositioned to maintain the zone’s correct air temperature.
A potential pain point that may be experienced is failure of
the actuators due to these constant repositions. One thing
for sure is that a durable damper actuator is needed for this
application and one of the features of Siemens VAV damper
actuators is that they are rated for 5 million repositions
and 100,000 full cycles to ensure a long product life.
Another potential pain point in VAV applications is incorrect
installation of the actuator to the VAV terminal unit.
Improperly installed actuators can put undo strain on the
damper, potentially causing damage to the damper which in
turn would cause the VAV terminal unit to fail prematurely.
Siemens’ single screw, self centering shaft adapter helps to
ensure correct installation. Our patented design not only
aids in correct installation, but it also simplifies installation to
save. Whether installing the actuator offsite or in the field,
easier and more accurate installation will always save
installers time and money.
Variable Air Volume
(VAV)
Variable Air Volume (VAV):
Type of heating, ventilating, and/or air-conditioning system which supplies a variable airflow at a constant temperature;
compared to the Constant Air Volume (CAV) which provides a constant supply of airflow at a variable temperature.
Concerns when specifying a damper actuator:
• Constant repositioning of VAV terminal unit damper is required in order to maintain correct zone temperature
• Correct engagement of damper actuator to damper drive shaft is imperative in order to get the full life out of
a VAV terminal unit