Distech Controls VA-024ZS Series Manuel

Hardware Installation Guide

VA-024ZS Series

Zone Valve Actuator, 24lb., Spring Return

Figure 1: VA-024ZS Series zone valve actuator

Product Description

This document describes the hardware installation procedures for the

following VA-024ZS Series zone valve actuators:

VA-024ZSC120D

24lb., Spring Return, Normally-Closed, 120V,

Digital

VA-024ZSC024D

24lb., Spring Return, Normally-Closed, 24V,

Digital

VA-024ZSO120D

24lb., Spring Return, Normally-Open, 120V,

Digital

VA-024ZSO024D

24lb., Spring Return, Normally-Open, 24V,

Digital

General Installation Requirements

For proper installation and subsequent operation of each actuator, pay

special attention to the following recommendations:

- Upon unpacking the product, inspect the contents of the carton for

shipping damages. Do not install damaged actuators.

- Avoid areas where corroding, deteriorating or explosive vapors,

fumes or gases may be present.

- Ensure that all equipment is installed according to local, regional,

and national regulations.

Personal injury or loss of life may occur if you do not follow a

procedure as specified.

Equipment damage or loss of data may occur if you do not

follow a procedure as specified.

Take reasonable precautions to prevent electrostatic

discharges to the controller when installing, servicing or

operating the controller. Discharge accumulated static

electricity by touching one’s hand to a well-grounded object

before working with the controller.

Mounting Instructions

Required Tools

- Small flat-blade screwdriver

- Wire stripper

Estimated Installation Time

- 20 minutes

1. If mounting the actuator to a valve already in line:

- Close the shut-off valves in the piping (upstream first,

then downstream).

- Switch off the pump to allow the differential pressure in

the valve to drop.

2. Disconnect the controller power before replacing the

actuator.

2/4

The vertical position is recommended for mounting.

Figure 2. Acceptable Mounting Positions.

Actuators must not be exposed to condensed/dripping

water. If the actuators are installed below piping that can

drip condensate, either the actuator needs to be protected

by shielding to deflect the water drip or the piping needs to

be insulated to prevent condensation.

Actuator housing must not be in contact, or close proximity

to adjacent hot water supply or return piping.

Loosen retaining ring and rotate actuator if necessary, to

avoid proximity or contact with hot water supply or return

piping, then re-tighten ring to maintain desired orientation.

Installation

The black actuator attachment support ring must be in place

on top of the valve bonnet before installing the actuator.

If the support ring is not in place, damage to the actuator

connection may result.

Mounting the VA-024ZSO Series Actuator to a Valve

1. Place the actuator on the valve and firmly hand-tighten the coupling

piece.

2. Connect the wires. See Wiring.

Mounting the VA-024ZSC Series Actuator on a Valve

1. Rotate the manual override lever and latch.

2. Place the actuator on the valve and firmly hand-tighten the

coupling piece.

Failure to fully rotate the manual override handle beforehand

tightening will hinder proper valve close off.

3. Release manual override handle.

4. Connect the wires. See Wiring.

Figure 3. Mounting the Actuator on a Valve.

The installation is now complete.

Removing the Actuator from a Valve

1. Disconnect the wiring.

2. Unscrew actuator-coupling piece from the valve body threads.

3. Remove the actuator from the valve.

Wiring

- All wiring must conform to NEC and local codes and regulations.

- Use earth ground isolating step-down Class 2 transformers.

Do not use autotransformers.

- Determine the supply transformer rating by summing the total VA

of all actuators used. The maximum rating for a Class 2 step-

down transformer is 100 VA.

It is recommended that one transformer power no more

than 10 actuators

- VA-024ZSC024D / VA-024ZSO024D, 24 Vac actuators: Wiring

connection can be made inside the actuator housing (remove the

housing top for access).

- VA-024ZSC120D/VA-024ZSO120D, line voltage actuators: Wiring

connection requires junction box and flex conduit no further than

15 inches (381 mm) from actuator.

G0 and G must be properly wired for correct function and full

life of the actuator.

Figure 4. 24 Vac Actuator Wiring Diagram.

Figure 5. 120 Vac Actuator Wiring Diagram.

Manual Override

For manual positioning, rotate the manual override handle clockwise

180°, and squeeze it to latch around protruding stop. See Figure 6.

The actuator will automatically unlatch when power is

applied.

3/4

NOTE:

The "0" and "1"

position markings

are intended for

reference only and

not stroke

measurement.

Override handle

at position 0.

Override handle at

position 1.

Figure 6. Manual Override Handle Position.

Start-Up

When the manual override handle is at the "0" position, the output shaft

is retracted if the actuator is normally open, or extended if normally

closed. See Figure 7.

When the Manual Override handle is rotated to position 1, the reverse

is true. See Figure 8.

Check the wiring and the position indication.

(A) Allow handle to turn counterclockwise to retract spindle.

(B) Turn handle clockwise to extend spindle.

Figure 7. Normally Open (VA-024ZSO Series).

(A) Allow handle to turn counterclockwise to extend spindle.

(B) Turn handle clockwise to retract spindle.

To avoid damage to actuator, DO NOT manually assist

spring return.

Figure 8. Normally Closed (VA-024ZSC Series).

Service Envelope

Minimum access space recommended: 8 inches (200 mm) above the

actuator.

Troubleshooting

Check the wiring for the proper connections.

While all efforts have been made to verify the accuracy of information in this manual, Distech Controls is not responsible for damages or claims arising from the use of this

manual. Persons using this manual are assumed to be trained HVAC specialist / installers and are responsible for using the correct wiring procedures and maintaining safe

working conditions with fail-safe environments. Distech Controls reserves the right to change, delete or add to the information in this manual at any time without notice.

Distech Controls, the Distech Controls logo, and Innovative Solutions for Greener Buildings are trademarks of Distech Controls Inc. All other trademarks are property of their

respective owners.

4/4

VA-024ZS Series_IG_10_EN

Dimensions

Figure 9. Dimensions of the Actuator Shown in Inches (Millimeters).

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