User Guide

Mounting

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 the valve body mounting nut. Refer to Figure-4 .

Figure-4 Housing and Base Location.

Dampers

The actuator is not position sensitive. It can be mounted in any position in an NEMA Type 1

location.

Valves

Allow 3" (76 mm) of clearance above the actuator valve assembly for the removal and

reattachment of the actuator to the installed valve.

1. Install all two-way valves so that they close against the flow. An arrow on the valve body

or tag indicates proper flow direction.

2. Always install three-way mixing valves with two inlets and one outlet.

3. Always install three-way diverting valves with one inlet and two outlets.

4. For steam applications only, mount the actuator above the valve body at 45° from

vertical.

5. Actuators can be mounted in any upright position above the centerline of the valve

body.

Wiring Requirements Control Leads

The control leads may be connected to a Class 2 circuit if routed separately from Class 1

circuit wiring. Refer to Figure-9 .

Caution:

• Use either 18 gage, two- or three-conductor twisted, shielded wire when it becomes

necessary to install the control leads in the same conduit with power wiring or when high

RFI/EMI generating devices are near.

• Do not connect the shield to earth ground or any other leads.

135 Ω Slidewire Controller: Use 18 gage, three-conductor, twisted leads (TAC Part

Number W-103 or equivalent) for runs of up to 500 ft. (152 m) between the 135 Ω slidewire

controller and the actuator. Use larger-gage wires for longer runs.

4 to 20 mAdc Controller: Use 18 gage, two-conductor, twisted leads (TAC Part Number

W-102 or equivalent) for runs of up to 500 ft. (152 m) between the 4 to 20 mAdc controller

and the actuator. Use larger-gage wires for longer runs.

Power Leads

The low voltage (24 Vac) actuators may be connected to a Class 2 circuit.

Line voltage (120 Vac and 240 Vac) power leads must be connected to a Class 1 circuit and

routed separately from Class 2 circuit wiring. Refer to Figure-9 .

Housing

Base

Wrench Flats