Product Overview

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, Figure-2, and Figure-3 for

typical control wiring diagrams.

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

Note:

As shown in Figure-12, 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-523x Series is provided with a factory-installed damper

linkage. No separately-ordered linkage is required.

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-5.

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-14) or closed position (Figure-15) 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-21).

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-16). This is the recommended mounting position. It may

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

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.

Conduit Lock Nut

Figure-13 Attachment of Conduit Box to Conduit Bushing.