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

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Components
A
Manual adjuster (with slide switch)
B
Wiring knockouts
C
Position indication
D
Status indication
E
Housing cover
F
Valve stem coupling
G
Yoke
H
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.
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.

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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.
A
Plug-in space for…
Auxiliary switch VA-ASC10.51.
B
Plug-in space for…
Function module VA-AZX61.1 or Auxiliary switch VA-ASC10.51
C
LED
D
DIP Switches
E
Calibration Slot
F
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
ON
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

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
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.

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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
1
The manual override always has priority 1,
thus overriding all signals active at “Z“ or
“Y“, independent of whether or not power is
applied.
2
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.
Z
3
The position is determined via positioning
signal ”Y”. The manual override is not used
and on "Z" there is no active signal.
Y
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.

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LED
Indication
Operating state
Remarks,
troubleshooting
Green
On
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
On
Calibration error
Start calibration again
Blinking
Detection of
foreign object
Check valve / actuator
Off
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%)
6V
Y
5V
12 mA
Actuator’s stem
retracts (50%)
5V
“Z” connected to “G”
Actuator’s stem
extends to 100%
10V
“Z” connected to
“G0”
Actuator’s stem
retracts to 0%
0V
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.

©, Distech Controls Inc., 2016. All rights reserved.
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
A
B
C
C1
C2
D
E
►
►►
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)

©, Distech Controls Inc., 2015. All rights reserved.
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).