Product Overview

5. Loosely install the conduit box and the locknut onto the conduit bushing. Refer to Figure-12.

6. Tighten the locknut as follows:

a. Tilt the conduit box approximately 30 degrees counterclockwise, relative to the actuator.

b. Finger-tighten the locknut against the conduit box.

c. Rotate the conduit box clockwise until it is aligned with the actuator. This will tighten the locknut.

7. Make the required wiring connections. Refer to Figure-1 and Figure-2 for typical control wiring diagrams.

8. Install the conduit to the conduit box as required.

Note:

As shown in Figure-11, the hole in the actuator’s cover plate is also sized to accept both British standard M20 (20 mm)

conduit connectors and 20 mm-to-PG16 adaptors for use with DIN PG16 connectors. (Follow the steps for installing the conduit

box to the actuator.)

Linkage Assembly

Damper

Note:

Each actuator in the MP-543X 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" open-ended wrench (TOOL-37) on the flats provided on the actuator base, or on the valve body

mounting nut. (Refer to Figure-3)

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 (Figure-13) or closed

position (Figure-14) 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).

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-18).

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-15). This is the recommended mounting position.

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

Conduit Lock Nut

Figure-12 Attachment of Conduit Box to Threaded Adaptor.