Watts W-AR Series - User Manual

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Series W-AR actuator is widely used in auto-control system to

regulate the opening rate of electronic valves. Along with Series

W-PICV valve body, the actuator is able to control the system’s

temperature, pressure and flow through receiving different kinds of

signals.

Electric Actuator

Features

• Easy to debug on site, no need to remove the shell

• Electronic presetting facilitates on-site commissioning

• Manual operation facilitates on-site trouble-shooting

• Precise positioning achieved by self-calibration function

Series W-AR

Working Principle

Modulation Type W-AR2M

The modulation type electric actuator can realize equal percentage

flow control. By inputting 0 (2) - 10VDC and 0 (4) - 20mA control

signals, the feedback output signal of valve position can be

observed, and the automatic regulation and control of pipeline fluid

medium can be realized, which makes the application of control valve

more flexible. After the modulation type electric actuator is powered

on, by pressing the SW1 learning / reset button on the shell, the

actuator will firstly go down to find the valve closing position, and

then reverse the upward direction to return to the reference position

and stop. After the self-adaptation is completed, it will automatically

enter the operation state. MCU (chip) will automatically save the

parameters obtained during learning, and it will not be lost even after

power failure. At this time, the driver power indicator on long time

light indicates that the self-adaptive is over, and the coordination and

adjustment of valve body and driver are completed. Currently, the

running direction of the driver is controlled by the control signal.

When the driver is powered on, press the SW1 learning / reset button

on the shell to enter the adaptive state if it needs to be adaptive.

On-off Type W-AR1S

The W-AR1S motorized actuator accepts two-wire and one–control

on/off type control. When the power is switched on, the actuator

drives the screw downwards one-way to close the valve. When the

external power is cut off, auto reset is triggered electronically to drive

the screw upwards to keep the valve open.

Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and

without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

Specifications

Model No.

Thrust Output

Power Supply

Feedback Signal

Connecting Wire Spec.

Power Consumption

Operating Time

Max. Stroke

Protection Class

Temperature Limits

Max. RH

W-AR1S-16 W-AR1S-25 W-AR2M-16

＞160N

110~240VAC 50/60H

On/off type

(two-wire, one control)

< 2W

≈5s/mm

6.5mm

IP54

Operation: 2 ～ +55℃ Storage: - 20 ～ +65℃

< 90% and no condensation

——

Two-core Length 200mm（2X0.5mm²）

The screw is preset in the upwards position for easy connection to the valve.

The actuator drives the screw downwards to close the

valve when the power is on and drives the screw upwards

to open the valve when power is off.

0(2)~10V DC(input resistance 200KΩ)

Or 0(4)~20mA DC(input resistance 500Ω)

0~10V DC (1mA)

Four-core Lengt 400mm（4X0.3mm²）

24VAC/DC±10%

W-AR2M-25

＞250N ＞160N ＞250

Control Signal

Factory Preset

Switch JP1 setting: 0~10 V DC control,RA status: the actuator

drives the screw upwards to close the valve by 0V control signal and

drives the screw upwards to open the valve by 10V control signal.

Model Description

WATTS

Electric Actuator

Multi-turn

W- A 1R S- 16

Power Supply:

1=110~240VAC

2=24VAC/DC

Control Mode:

S =ON/OFF Type M=Modulation Type

Output Force:

16=160N 25=250N

W-AR-EN-2007

Material

Flame-Retardant ABS Engineering Plastics

Glass Fiber Flame-Retardant Nylon PA66+30%

Brass HPb59-1

Compontent

Upper Shell

Lower Shell

Center Crew

and gear

Connecting Nut

Material

10% Glass Fiber Reinforced POM

Installation Dimensions (mm)

Upstream installation dimension of 160N actuator=13.6mm

Upstream installation dimension of 250N actuator=15.8mm

M30X1.5

≥5075

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The Watts Series W-AR Electric Actuator is designed for auto-control systems to regulate the opening rate of electronic valves. When paired with a Series W-PICV valve body, it can control system temperature, pressure, and flow by responding to various signals.

Function Description

The actuator comes in two main types: Modulation Type W-AR2M and On/Off Type W-AR1S.

Modulation Type W-AR2M: This type provides equal percentage flow control. It accepts 0(2)-10VDC and 0(4)-20mA control signals and outputs a feedback signal of valve position, enabling automatic regulation of pipeline fluid medium. This makes the control valve application highly flexible. Upon power-up, pressing the SW1 learning/reset button initiates a self-adaptation process. The actuator first drives the screw downwards to find the valve's closing position, then reverses upwards to a reference position and stops. Once self-adaptation is complete, it enters operational state. The MCU (chip) automatically saves the learned parameters, which are retained even after power loss. A continuously lit driver power indicator signifies that self-adaptation is complete and the valve body and driver are coordinated. The running direction is controlled by the input signal. If re-adaptation is needed, the SW1 button can be pressed again.

On/Off Type W-AR1S: This motorized actuator accepts two-wire, one-control on/off signals. When powered on, the actuator drives the screw downwards to close the valve. When external power is cut off, an electronic auto-reset mechanism drives the screw upwards to open the valve.

Usage Features

Easy On-Site Debugging: The design allows for debugging without removing the actuator shell.
Electronic Presetting: Facilitates convenient on-site commissioning.
Manual Operation: Aids in on-site troubleshooting.
Precise Positioning: Achieved through a self-calibration function.
Installation: The actuator's screw is preset upwards (fully open valve position) at the factory for direct connection. If tested electrically and set downwards, it must be reset to the top via power-on or manual operation before installation. Sufficient space above the actuator is required for disassembly and maintenance. The actuator must be protected from water leakage. Manual operation is forbidden when the actuator is powered on.

Maintenance Features

Self-Stroking (W-AR2M): No housing disassembly is required. Pressing the Learn/Reset Button SW1 after power-on initiates self-stroking. The actuator drives the screw down to find the closing position, then up to the preset position, entering operational status. The MCU saves these parameters, which are retained even after power loss.
Control Signal and Status Shift (W-AR2M): To adjust control functions, disassemble the housing, set the JP1 switch according to the desired functions, then press the SW1 Learn/Reset button. The indicator light flashes during learning, and once self-stroking is complete, it stops flashing and remains on, indicating operational status.

Important Technical Specifications

Model Description:

W: WATTS
A: Electric Actuator
R: Multi-turn
Power Supply:
- 1: 110~240VAC
- 2: 24VAC/DC
Control Mode:
- S: ON/OFF Type
- M: Modulation Type
Output Force:
- 16: 160N
- 25: 250N

Materials:

Upper Shell: Flame-Retardant ABS Engineering Plastics
Lower Shell: Glass Fiber Flame-Retardant Nylon PA66+30%
Center Screw and Gear: 10% Glass Fiber Reinforced POM
Connecting Nut: Brass HPb59-1

Installation Dimensions:

Overall height: 82 mm
Width: 65 mm
Minimum clearance above: ≥50 mm
Connecting nut: M30x1.5
Upstream installation dimension:
- 160N actuator: 13.6mm
- 250N actuator: 15.8mm

Specifications Table:

Feature	W-AR1S-16	W-AR1S-25	W-AR2M-16	W-AR2M-25
Thrust Output	>160N	>250N	>160N	>250N
Power Supply	110~240VAC 50/60Hz	24VAC/DC±10%
Control Signal	On/off type (two-wire, one control)	0(2)~10V DC (input resistance 200KΩ) Or 0(4)~20mA DC (input resistance 500Ω)
Feedback Signal		0~10V DC (1mA)
Connecting Wire Spec.	Two-core Length 200mm (2X0.5mm²)	Four-core Length 400mm (4X0.3mm²)
Power Consumption	< 2W
Operating Time	≈5s/mm
Max. Stroke	6.5mm
Factory Preset	W-AR1S: Actuator drives screw downwards to close valve when power is on; drives screw upwards to open valve when power is off.	W-AR2M: Switch JP1 setting: 0~10V DC control, RA status: actuator drives screw upwards to close valve by 0V control signal and drives screw upwards to open valve by 10V control signal.
	The screw is preset in the upwards position for easy connection to the valve.
Protection Class	IP54
Temperature Limits	Operation: 2 ~ +55°C; Storage: -20 ~ +65°C
Max. RH	< 90% and no condensation

Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.