Distech Controls VA-045PNX024P Manual

Hardware Installation Guide

VA-045PNX024P

PICV Actuator, 45lb., Non-Spring Return, 24V, Proportional 0-10V Electronic Valve Actuator

Figure 1: VA-045PNX024P Electronic Valve Actuator

Product Description

This document describes the hardware installation procedures for the

VA-045PNX024P PICV Actuator, 45lb., Non-Spring Return, 24V,

Proportional 0-10V.

This actuator requires a 24 Vac supply and receives a 0 to 10 Vdc or a 4

to 20 mA control signal to proportionally control a valve. This actuator is

designed to work with 1-1/2- or 2-inch normally open (NO) Pressure

Independent Control Valves with a 5/8-inch (15 mm) stroke.

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.

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.

Mounting Instructions

Required Tools

- 4 mm hex key, or 10 mm wrench

- Flat-blade screwdriver or Phillips screwdriver to remove wiring

compartment cover

Estimated Installation Time

- 30 minutes for wiring a factory-installed actuator

- 45 minutes for field replacement of actuator

2/9

Components

Manual adjuster (with slide switch)

Wiring knockouts

Position indication

Status indication

Housing cover

Valve stem coupling

Yoke

Bonnet connection U-bracket

Accessories

Auxiliary switch

VA-ASC10.51

Auxiliary switch VA-ASC10.51 switches on or off

when a certain position is reached. The switching

point can lie between 0 to 100%.

Function

module

VA-AZX61.1

Function module VA-AZX61.1 offers the following

choices for changing control:

•Changeover of acting direction

•Sequence control (adjustable start and span)

Weather Shield

VA-ASK39.1

Weather Shield VA-ASK39.1 protects the actuator

when installed outdoors. Provides NEMA 3R

protection.

Mounting Positions

Figure 2: Acceptable Indoor Mounting Positions

Figure 3: Acceptable Outdoor Mounting Positions with Weather Shield for

NEMA 3R Protection

The vertical position is the recommended position for mounting. Figure 2

and 3 show the acceptable mounting positions.

Allow 8 inches (200 mm) above and on the wiring side of the actuator,

and four inches (100 mm) on all other sides of the actuator. This service

envelope is the minimum space required to access and service the

actuator. See Dimensions for actuator dimensions and the recommended

service envelope.

3/9

Installation

Do not damage or scratch the polished surface of the valve

stem.

Mounting an Actuator to a Valve

1. Ensure stem connection plate in the Valve Stem Coupling is in the

OPEN position. See Figure 4.

Figure 4.

2. Open the bonnet connection U-bracket.

Figure 5.

3. Pull the valve stem to the fully extended position. Then, slide the

actuator on the valve bonnet. See Figure 6.

Figure 6.

4. Completely close the bonnet connection U-bracket. See Figure 7.

Figure 7.

Position the actuator to accommodate the wiring. Hold the

actuator in place while tightening the actuator U-bracket bolt.

5. Tighten the U-bracket bolt using a 10 mm wrench (or 4 mm hex key)

to 5 Nm (44 in-lbs) torque. See Figure 8.

Figure 8.

6. Rotate the manual adjuster clockwise to manually extend the actuator

shaft until it covers the head of the valve stem See Figure 9.

Figure 9.

7. Close the stem connection plate securely over the valve stem. See

Figure 10.

8. Secure the stem connection plate by tightening the bolt, using a 10

mm wrench (or 4 mm hex key). See Figure 11.

Figure 11.

The mounting is now complete.

Do NOT rotate the actuator on the valve once the actuator

and valve stem are connected. Doing so will inadvertently

adjust the flow setting of the valve or damage the stem.

4/9

Removing the actuator from a valve

1. Loosen the stem connection plate in the Valve Stem Coupling by

loosening the bolt, using a 10 mm wrench (or 4 mm hex key).

2. Open the stem connection plate over the valve stem.

3. Manually retract the actuator shaft by turning the Manual Adjuster

counterclockwise until it reveals the head of the valve stem.

4. Loosen the U-bracket using a 10 mm wrench (or 4 mm hex key).

5. Completely open the bonnet connection U-bracket.

6. Push the valve stem to the fully retracted position. Then, slide the

actuator off the valve bonnet.

7. Remove the actuator from the valve, being careful not to damage the

valve stem.

8. Close the bonnet connection U-bracket.

Figure 12. VA-045PN Actuator with Cover Removed.

Plug-in space for…

Auxiliary switch VA-ASC10.51.

Plug-in space for…

Function module VA-AZX61.1 or Auxiliary switch VA-ASC10.51

LED

DIP Switches

Calibration Slot

Connection Terminals

Start-Up

Switch 1: Control Signal

Select between 0 to 10 Vdc or 4 to 20 mA input signal for terminal Y (0 to

10 Vdc default).

Switch 2: Flow Characteristic

Do not change the characteristic switch. The proper flow

characteristic is designed into the VA-599 Series Pressure

Independent Control Valve.

Changing the default setting will modify a linear valve to a fast-opening

flow characteristic. When set to default, the flow characteristic is

determined by the valve body.

Set the actuator switches as specified. These switches do

not reverse the action from NO to NC or vice versa. The PIC

valve body assembly determines the complete assembly

action as normally open.

Check the wiring for proper connections.

DIP Switch Settings

Positioning

Signal "Y"

Position

Feedback

"U"

Flow

Characteristic

OFF 1)

0 to 10

Vdc

0 to 10 Vdc

Default

DC 4 to

20 mA

0 to 10 Vdc

Modified

1) Factory setting: All DIP switches are set to OFF.

Table 1. DIP Switch Settings.

Pressure Independent Control Valve

Increasing the control signal extends the actuator (0 to 1): Valve closes.

Decreasing the control signal retracts the actuator (1 to 0): Valve opens.

If the application requires a reverse-acting, modulating

actuator (a control signal of 0V corresponds to the valve

being closed, and 10V to the valve being open), then the

Function Module (VA-AZX61.1) must be ordered and

installed in the VA-045PNX024P with DIP switch 1 set to

ON.

Wiring

Do not use autotransformers. Use earth ground isolating step-down Class

2 power supply transformers.

Determine supply transformer rating by summing total VA of all actuators

used.

The maximum rating for a Class 2 step-down transformer is 100 VA.

It is recommended that no more than 10 actuators are powered by one

transformer.

Up to 10 actuators can be driven in parallel from a single controller output

with a 1 mA rating. The VA-045PNX024P proportional actuator has an

input impedance of 100K ohm.

Figure 13. Connecting Terminals

System Neutral (SN)

System Potential (SP)

Positioning signal for 0 to 10 Vdc/4 to 20 mA

Measuring neutral

Position feedback 0 to 10 Vdc

Positioning signal forced control

If the application requires a reverse-acting, modulating actuator (a control

signal of 0V corresponds to the valve being closed, and 10V to the valve

being open), then the Function Module (AZX61.1) must be ordered and

installed in the VA-045PNX024P with DIP switch 1 set to ON.

Parallel Control of Actuators

Up to 10 actuators can be driven in parallel from a single controller output

with a rating of 1 mA. Modulating actuators have an input impedance of

100KΩ.

Use either a Phillips head screwdriver or a flat-blade

screwdriver to remove the wiring compartment housing

cover for access to the terminal block and DIP switches.

Wiring Diagrams

Accessories

A and/or B

1x VA-ASC10.51

Auxiliary Switch

1x VA-ASC10.51

Auxiliary Switch

Figure 14. Applications.

The wiring diagrams show all possible connections. The application

determines which connections are used. A and B are optional auxiliary

switches.

Wiring Terminals

24 Vac/Vdc, 0 to 10 Vdc, 4 to 20 mA, 0 to 1,000Ω

G0 - System neutral (SN)

G - System potential (SP)

Y - Positioning signal for 0 to 10 Vdc/4 to 20 mA

M - Measuring neutral

U - Position feedback 0 to 10 Vdc

Z - Positioning signal forced control

Manual Override

Automatic Mode

When the motor drives the manual adjuster turns. In Automatic Mode, the

manual adjuster is used for indication of travel. If the manual adjuster is

held firm in this mode, there is no transmission of power to the gear train.

Manual Operation

When pushing the manual adjuster down (1), it engages and the actuator

can be manually operated.

When turning the manual adjuster in a clockwise/counterclockwise

direction (2), the actuator’s stem extends/retracts. See Figure 15.

An overload protection prevents damage to the manual adjuster.

Figure 15.

Setting the Position

When the black slide switch is pushed out, the manual adjuster remains

engaged.

When in this mode, do not turn the manual adjuster.

Figure 16.

6/9

Disengaging the setting

When the black slide switch is pushed back in, and the manual adjuster is

not pressed down, the manual adjuster returns to Automatic Mode.

Figure 17.

Automatic Operation

The actuator will return to automatic operation when the manual adjuster

is released.

Signal Priorities

The actuators are controlled via different interlinked positioning signal

paths (positioning signal “Y“, forced control input “Z“, or manual override).

The signal paths are assigned the following priorities (1 = highest priority,

3 = lowest priority):

Priority

Description

The manual override always has priority 1,

thus overriding all signals active at “Z“ or

“Y“, independent of whether or not power is

applied.

As soon as a valid positioning signal is

active at input “Z“, the position is determined

via positioning signal “Z“ (forced control).

Prerequisite: The manual override is not

used.

The position is determined via positioning

signal ”Y”. The manual override is not used

and on "Z" there is no active signal.

Function Check and Calibration

Mechanical Check

Prior to making the function check, ensure that:

Actuator is mechanically connected to a Pressure Independent

Control Valve.

Actuator is in Manual Operation mode.

The actuator can be operated with the help of the Manual Adjuster.

Manual Adjuster Action

Actuator Response

Turning in clockwise direction

Actuator’s stem extends

Turning in counterclockwise

direction

Actuator’s stem retracts

Ensure that the actuator’s and valve’s stems are securely

connected in all positions.

If the actuator is forced to travel beyond its end positions,

overload protection responds.

Electrical Check

Prior to making the function check, ensure that:

Actuator is mechanically connected to a VA-599 Series Pressure

Independent Control Valve.

Actuator is in Automatic Operation mode.

Actuator and, if required, accessories are correctly fitted and

connected.

Power is applied.

Calibration

Calibration is required with modulating actuators, and before the function

check. Calibration must be performed manually.

Prior to calibrating, ensure that:

Actuator is properly connected to a valve.

Housing cover is removed.

Power is applied.

If required, calibration can be repeated any number of times.

To initiate the calibration process insert a flat-blade screwdriver into the

calibration slot to short out the two sides of the slot. See Figure 18.

Figure 18. Step 1—Bridge contact.

During calibration, the actuator detects the valve’s end positions and files

the exact stroke in its internal memory. Calibration takes place in three

phases:

Actuator drives to H0(1), retracting actuator stem. Detection of

upper end position.

Actuator drives to H100 (2), extending actuator stem. Detection of

lower end position.

The detected values are stored (3). Then the actuator follows the

applied control signal.

Observe the status indication (LED) during and after calibration. See

Figures Figure 19 and Table 2.

Figure 19. Step 2—Check LED.

7/9

LED

Indication

Operating state

Remarks,

troubleshooting

Green

Automatic mode

Normal operation

Blinking

Calibration

Wait until calibration is

finished

(then green or red light)

In manual mode

Manual adjuster in

MAN position

Red

Calibration error

Start calibration again

Blinking

Detection of

foreign object

Check valve / actuator

Off

No power or

electronics faulty

Check operating

voltage

Table 2. LED Indication and Status.

Function Check

Perform the function check for modulating actuators after calibration with

a point test according to the following table:

Connection

Terminals

Actuator Response

Position

Feedback (U)

Y

6V

13.6 mA

Actuator’s stem

extends (60%)

5V

12 mA

Actuator’s stem

retracts (50%)

“Z” connected to “G”

Actuator’s stem

extends to 100%

10V

“Z” connected to

“G0”

Actuator’s stem

retracts to 0%

Table 3. Modulating Function Check.

After successful completion of the function check, the actuator is ready

for normal operation.

Operation

The actuator accepts a 0 to 10 Vdc or a 4 to 20 mA control signal and a

microprocessor produces a stroke proportional to the input signal.

In the event of a power failure or with no control voltage, the damper

actuator holds its position.

If the application requires a reverse-acting, modulating actuator (a control

signal of 0V corresponds to the valve being closed, and 10V to the valve

being open), then the Function Module (VA-AZX61.1) must be ordered

and installed in the VA-045PNX024P with DIP switch 1 set to ON.

Position Indication

The actuator position indicated by the position output signal "U" is

calculated by a potentiometer that sends a feedback signal via the U

terminal.

Troubleshooting

Check that the wires are connected correctly and attached securely.

Check for adequate power supply.

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.

8/9

*VA-

045PNX024P_IG_1

1_EN*

VA-045PNX024P_IG_11_EN

129-591

Dimensions

Service Envelope

Minimum access space recommended

4 inches (100 mm) 8 inches (200 mm)

Product

Numbers

►

►►

Weight

lbs (kg)

VA-045PNX024P

9.53

(242)

4.88

(124)

5.91

(150)

2.68

(68)

3.23

(82)

3.15

(80)

3.94

(100)

3.94

(100)

7.87

(200)

4.1

(1.85)

With VA-ASK39.1

10.51

(267)

6.06

(154)

11.81

(300)

7.87

(200)

3.94

(100)

–

4.6

(2.08)

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 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, Innovative Solutions for Greener Buildings, and Allure are trademarks of Distech Controls Inc.; ARM Cortex is a registered

trademark of ARM Limited; BACnet is a registered trademark of ASHRAE; All other trademarks are property of their respective owners.

9/9

VA-045PNX024P_IG_11_EN

Figure 20. VA-045PN Series Dimensions in Inches (Millimeters).

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