Brochure

8
What’s the voltage and control signal?
Consider the appropriate voltage needed along with choosing
the correct control signal. Choosing an incorrect control
signal could lead to improper use of equipment which leads
to lost dollars.
Selecting a fail position
Understanding the actuator's fail position (non-spring return vs. spring return) is important. If the power supply is lost, the
actuator will either fail in its current position, or the mechanical spring takes over and forces the actuator back to its original
starting position.
In certain cases when power is lost and the application requires protection to the internal components, the damper should be
forced to its original starting position. This would be a use case for fail-safe spring return actuators.
A situation where a fail-in-place non-spring return actuator would be used is in a damper near a fan. If power is lost, make sure
that damper is forced back to the fully closed position, so an actuator that has fail-safe can protect the internal components.
#3: Understand application requirements
The third step is understanding the application requirements.
Choose which actuator fail position is the best fit for the
project and decide what voltage and control signal
is needed.
Floating
Modulating
24 VAC/DC
120 VAC
230 VAC
DC
AC
Controlled Variable
Differential
Operating
Operating
Floating
Time
Controlled Variable
Integral
Proportional
Setpoint
Time
2-Position
Off
Controlled Variable
On On On
Differential
Time
Off Off
Spring Return vs. Non-Spring Return
Actuator Selection Checklist
1. Assess damper physical properties
2. Check the specifications
3. Understand application requirements

4. Adjust for mounting or accessories