Distech Controls VA-056P Series Manuale

Hardware Installation Guide

VA-056P Series

PICV Actuator, 56lb., 24V

Figure 1: VA-056P Series : VA-056PNX024P (left) and VA-056PSX024P (right)

Product Description

The VA-056P Series PICV actuators require a 24 Volt power supply

and a 0 to 10 Vdc or floating control signal to control the 1/2-inch to 1-

1/4-inch VA-599 Series Pressure Independent Control Valves with a

1/10-inch (2.5 mm) or 7/32-inch (5 mm) stroke.

This document describes the hardware installation procedures for the

following VA-056P actuators:

VA-056PSX024P

56lb., Spring Return, 24V, Proportional 0-

10V

VA-056PNX024P

56lb., Non-Spring Return, 24V, Proportional

0-10V

VA-056PSX024F

56lb., Spring Return, 24V, Floating

VA-056PNX024F

56lb., Non-Spring Return, 24V, Floating

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

Contents

VA-056PNX024P/F:

- One actuator

- One terminal plug

- One terminal connector

VA-056PSX024P/F:

- One actuator

Required Tools

- 3 mm hex wrench

- Small flat-blade screwdriver

- Small, Phillips screwdriver

- Wire stripper

Expected Installation Time

20 minutes

2/6

Mounting Positions

Figure 2. Acceptable Mounting Positions.

Vertical mounting position is recommended.

Figure 3. Acceptable Mounting Position with Valve.

Vertical mounting position is recommended.

If mounting the actuator to a valve already in line, either

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

then downstream), or switch off the pump to allow the

differential pressure in the valve to drop.

Disconnect the controller power before replacing the

actuator. See Removing a VA-056PSX024P/F Actuator

from a Valve.

- Before applying power, make certain a valve is

connected to the actuator.

- If applying power to the actuator when a valve is

not connected, the actuator will respond to a

control signal and the shaft will extend until it

reaches its maximum end stop. Thereafter, it will

not respond to any signal.

- If this occurs, disconnect the power. Insert a 3mm

hex wrench into the manual override feature and

retract the actuator to the zero position. Verify the

actuator shaft is retracted completely. See Figure

15.

- Connect a valve to the actuator, reapply the

power, and the actuator will return to normal

operation.

Installation

Mounting an VA-056PNX024P/F Actuator on a Valve

1. Remove the protective plastic cap from the valve. See Figure 4.

Figure 4. Remove Plastic Cap.

2. Using a 3 mm hex wrench, turn the manual-position indicator on

the top of the actuator to "0".

3. Attach the wires to the terminal plug. (Reference Wiring, See

Figure 9 and Figure 12.)

4. Insert the terminal plug into the terminal connector. See Figure 5.

Figure 5. Terminal Plug and Terminal Connector.

5. Place the terminal connector and plug into the actuator, fitting the

nut into the recess in the bottom of the actuator. See Figure 6.

Figure 6. Insert Terminal Connector.

6. Tighten the screw to hold the connector in place. See Figure 7.

Figure 7. Tighten the Screw.

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

coupling clockwise. See Figure 8.

3/6

Figure 8. Hand-Tighten Clockwise.

Be sure the visual position indicator is at the “0”position

Installation is complete.

Mounting an VA-056PSX024P/F Actuator on a Valve

1. If you are attaching the actuator to a new valve, remove the

protective plastic cap from the valve stem.

2. Use a 3mm hex wrench to retract the actuator to the 0 position

(Figure 15).

3. Using a Phillips head screwdriver, remove the terminal cover

(Figure 17).

4. Remove wiring retention screw.

5. Remove plenum cable adapter.

6. For plenum applications, complete wiring as follows:

a) Route cable through plenum cable adapter so there is

sufficient cable to complete wiring terminations.

b) Insert plenum cable adapter into flex conduit adapter and

secure in place with wiring retention screw.

Insert wiring retention screw in hole of the flex conduit

adapter. (The hole nearest the wiring terminals is to

secure the terminal cover in place.)

c) Continue with Step 8.

7. For 3/8-inch flex conduit applications, complete wiring as follows:

a) Discard plenum cable adapter.

b) Insert flex conduit into flex conduit adapter and secure in

place with wiring retention screw.

Insert wiring retention screw in hole of the flex conduit

adapter. (The hole nearest the wiring terminals is to

secure the terminal cover in place.)

c) Route wiring through flex conduit for wiring terminations.

8. Connect wires to wiring terminals per the Wiring section of this

document.

9. Secure the terminal cover in place over the wiring terminals (Figure

17) using a Phillips head screwdriver,

10. Place the actuator on the valve and firmly hand-tighten (Figure 8).

Hand-tighten the actuator to the valve. The use of tools

to tighten the assembly together will cause damage.

The installation is complete.

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-056PNX024F

Figure 9. VA-056PNX024F Wiring Diagram.

Table 1. VA-056PNX024F Terminal Designations.

24 Vac Operating Voltage

Output shaft extends

Output shaft retracts

VA-056PSX024F

G, G0: 24 Vac Operating voltage

Y2: Retracts actuator shaft

Y1: Extends actuator shaft

G: System neutral

G0: System potential (switched)

Figure 10. VA-056PSX024F Floating Control SR Hot-Switch.

Terminals must be properly wired for correct function

and full life of the actuator.

4/6

G, G0: 24 Vac Operating voltage

Y2: Retracts actuator shaft

Y1: Extends actuator shaft

G: System potential

G0: System neutral (switched)

Figure 11. VA-056PSX024F Floating Control SR Neutral Switching

Applications.

For proper operation, it is recommended no more than

three actuators be assigned to any single control signal

VA-056PNX024P / VA-056PSX024P

Figure 12. VA-056PNX024P / VA-056PSX024P Wiring Diagram.

Table 2. VA-056PNX024P Terminal Designations.

G,G0

24 Vac operating voltage

System potential, 24 Vac

System neutral

0 to 10 Vdc control signal

On the VA-056PNX024P/VA-056PSX024P the wire

connection G is 24 Vac, system potential (HOT), not

System neutral (ground).

G0 and G must be properly wired for the correct

function and full life of the actuator.

Start Up

Check the wiring and the position indication. See Figure 13 for referred

positions “0”and “1” on the position indicator.

- When the position indicator disc rotates to position "1", the output

shaft is extended.

- When the position indicator disc is at the "0" position the output

shaft is retracted.

Position 1

Position 0

Figure 13. Visual Position Indication.

Calibration Stroke

The VA-056PSX024P writes its calibration stroke parameters to non-

volatile memory on the first start-up of the actuator. Successive start-

ups bypass the calibration stroke unless the memory is manually

cleared. If installing the actuator on a different valve (such as on a

replacement valve), manually clear the calibration stroke from memory

as follows:

1. Remove the terminal cover using a Phillips head screwdriver.

2. Locate hole on the circuit board with the shorting bars. See Figure

14.

3. With power applied to the unit, insert and gently twist a flat-blade

screwdriver to electrically connect the shorting bars. The VA-

056PSX024P then performs a new calibration stroke.

4. Secure the terminal cover back in place.

Figure 14. Manually Clearing Calibration Stroke from VA-

056PSX024P Non-volatile Memory.

Note:

The "0" and "1"

position

markings are

intended for

reference only

and not for

stroke

measurement.

5/6

Manual Override

A 3 mm hex wrench can be used to move the actuator to any position

between 0 and 1.

A control signal from the controller takes priority in

determining the position.

To retain the manually set position, unplug the

connecting cable or switch off power and the control

signal.

Turn the wrench clockwise to extend the actuator shaft

(counterclockwise to retract). The actuator will maintain its position

until power is provided or restored.

VA-056PNX024P/VA-056PSX024P: If an override is

performed while the power supply is connected, the

actuator will not track accurately when the control signal

is applied. A short power off/power on sequence is

required to recalibrate the actuator.

(A) Turn hex wrench counterclockwise to retract the shaft.

(B) Turn hex wrench clockwise to extend the shaft.

Figure 15. Manual Override.

Removing an VA-056PNX024P/VA-056PNX024F Actuator from

a Valve

1. Loosen the terminal connector with a flat-blade screwdriver.

2. Remove the terminal connector and the terminal plug from the

actuator.

Figure 16. Removing Terminal Plug.

3. Remove the terminal plug from the connector and save.

4. Loosen the actuator coupling, turn counterclockwise.

5. Remove the actuator from the valve.

Removing an VA-056PSX024P/VA-056PSX024F Actuator from

a Valve

1. Remove the terminal cover (Figure 17) using a Phillips head

screwdriver.

2. Identify and disconnect wiring from the terminals.

3. Remove wiring retention screw.

4. Do one of the following:

a) Remove plenum cable adapter and plenum cable; or

b) Remove flex conduit.

5. Loosen the actuator coupling on the valve (Figure 8, reverse #2).

6. Remove the actuator from the valve.

Figure 17. VA-056PSX024P/VA-056PSX024F Actuator Components.

Troubleshooting

- Check the wiring for the proper connections.

- If actuator becomes inoperable, replace the unit.

Service Envelope

Minimum access space recommended:

1. 8 inches (200 mm) above the actuator.

2. 8 inches (200 mm) beside the terminal cover.

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.

6/6

VA-056P Series_IG_10_EN

Dimensions

Figure 18. VA-056PNX024P/VA-056PNX024F Actuator in Inches (Millimeters).

Figure 19. VA-056PSX024P/VA-056PSX024F Actuator Dimensions in Inches (Millimeters).

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