User Guide

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-16):

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.

Valve

For valve assembly details refer to

AV-600, Valve Linkage Kit General Instructions, F-26279

for VB-9xxx valves, or

AV-7600-1, Valve Linkage Kit General Instructions, F-26235

for

VB-7xxx valves, with

AV-601, Linkage Extension Kit General Instructions, F-26280

. Refer to

Figure-22 for external dimensions of the valve actuator.

Adjustments Auxiliary Switch (MP-52xx-500)

The switching point is adjustable over the entire actuator stroke and is pre-set at the factory

to close the N.C. contacts at the retracted end of stroke. Turning the switch adjustment

screw CW (using TOOL-12), adjusts the make (or break) point closer to the extended end

of stroke. Refer to Figure-17.

Figure-17 Auxiliary Switch Point Adjustment and

Position Indication for MP-5200 Series.

Position Indication and

Switch Action Cam

Auxiliary Switch

Adjustment Screw

MP-52XX-500

Series