Product Overview

Linkage Assembly Damper

Note:

Each actuator in the MA-5x3x series is provided with a factory-installed damper

linkage. No separately-ordered linkage is required.

Caution:

Do not twist or exert any force on the actuator housing during installation. Either

turn the base by hand or, if necessary, use a 1-5/8" (41 mm) open-ended wrench (TOOL-

37) on the flats provided on the actuator base, or on the valve body mounting nut. (Refer to

Figure-2.)

1. Determine the best mounting position for the actuator as follows:

a. Determine, from the system requirements, if the damper should spring-return to the

open position (refer to Figure-12) or closed position (refer to Figure-13) whenever

power is lost to the actuator. For example, an outside air damper actuator is typically

linked so as to retract (spring-return) to the damper’s fully closed position (safe

position).

Figure-12 Dampers Open When Actuator Retracts

(Spring-Returns Open on Power Loss).

Figure-13 Dampers Open When Actuator Extends

(Spring-Returns Closed on Power Loss).

b. Be sure to allow adequate working space around the actuator mounting location to

mount the actuator, link it to the damper, and wire it into the system (refer to

Figure-20).

c. If possible, select a mounting position such that, at mid-stroke, the actuator crank

arm and the damper crank arm on the drive shaft are each at a 90° angle to the

damper rod (Refer to Figure-14). This is the recommended mounting position. It

may be necessary to swivel the actuator linkage to arrive at this mounting location.

Spring returns open

on loss of power

Open

ExtendRetract

Damper Shaft

Spring returns open

on loss of power

Open

Extend Retract

Damper Shaft