Product Overview

F-15070-14 Copyright 2008 TAC All Rights Reserved. 11
Figure-14 Recommended Actuator/Damper Mounting.
d. Consider the damper rod length when positioning the actuator in relation to the
damper. A damper rod that is too long is not rigid enough to provide good control,
while a damper rod that is too short makes adjustment difficult.
2. Position the actuator on the duct and mark the location of the mounting holes, using the
actuator mounting bracket as a template (refer to Figure-20).
3. Drill or punch the mounting holes in the duct for the appropriate 1/4" (6 mm) diameter
screws or bolts. The actuator must be mounted firmly enough to prevent excessive
actuator movement under normal damper loading. If there is excessive actuator
movement, the damper may not fully open or close.
4. Mount a ball joint connector in the slot on the damper crank arm. To achieve 90° of
damper rotation, position the connector 1-1/2" (38 mm) from the centerline of the shaft
hole on the crank arm. For 60° of damper rotation, position the connector 2" (50 mm)
from the shaft hole centerline. Typically, 60° to 70° of rotation (maximum is 90°) is
sufficient to permit almost maximum air flow through the dampers. (Refer to Figure-14).
5. Rotate the damper to its open position. Install and secure the damper crank arm
(with ball joint connector) to the damper shaft, positioning the crank arm as follows
(Refer to Figure-14):
a. To achieve 60° of damper rotation, position the crank arm so that it is pointed
towards the actuator at 30° from its mid-stroke position.
b. To achieve 90° of damper rotation, position the crank arm so that it is pointed
towards the actuator at 45° from its mid-stroke position.
6. Install the damper rod by sliding one end through the ball joint connector mounted on
the damper crank arm, and the other end through the straight connector on the actuator
crank arm. Tighten the nut on the actuator crank arm’s straight connector. Cut off any
excess length of damper rod.
7. For normally open dampers, tighten the nut on the ball joint connector on the damper
crank arm. To ensure that the damper closes completely, make adjustments so that the
actuator is 1/16" (1.6 mm) from the extended end of stroke when the damper closes.
Verify and, if necessary, make final adjustments during system checkout.
8. For normally closed dampers, rotate the damper crank arm until the damper is closed.
While holding the damper closed, tighten the nut on the ball joint connector on the
damper crank arm. To ensure that the damper closes completely, make adjustments so
that the actuator is 1/16" (1.6 mm) from the retracted end of stroke when the damper
closes.
Final adjustment of the actuator and damper must be performed when the system is
powered and functioning. Refer to the CHECKOUT section to ensure that the damper is
linked correctly.
Mounting
Points
Actuator
Crank Arm
Mid-Stroke Position
Angle from Mid-Stroke
Position (See Table)
Position of Linkage
Connector (See Table)
Damper
Shaft
Damper
Crank Arm
Linkage
Connectors
Damper
Rod
Mounting
Points
Required
Damper
Rotation
Angle
from
Mid-Stroke
Position
Position of
Linkage
Connector
60°
90°
30°
45°
2" (50 mm)
1-1/2" (38 mm)