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Dodge Engineering & Controls, Inc.
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Installation
EN221 and EN310 Non-Spring Return Electronic Actuators
Sizing Actuators for Damper Applications
The number of actuators required depends on several factors. To determine the quantity of actuators required for
the installation:
• Obtain damper torque ratings (ft-lb/ft
2
or Nm/m
2
) from the damper manufacturer.
• Determine the area of the damper.
• Calculate the total torque required to move the damper:
Total Torque = Torque Rating x Damper Area
• Select the total quantity of actuators, required:
Number of Actuators =
Total Damper Torque required
SF
(see note
below)
Actuator Torque
(refer to
specifications)
x
NOTE: When calculating the number of actuators required, a safety factor (SF) should be included for
unaccountable variables such as slight misalignments, aging of the damper, etc. A suggested
safety factor is 0.80 (or 80% of the rated torque).
• Mechanical coupling of the actuator is allowed if:
− The same type of actuator is used.
− The power trunk can handle added components.
− The same control input goes to both actuators (parallel wiring).
UL Doc. No. 129-272 EAI/EN-13 Dodge Engineering & Controls, Inc.
Rev. 5, Jan., 2005