Thermal Actuator 920039PL
The 920039PL Thermal Actuator is an electrically-operated valve actuator designed for zone control in underfloor heating, radiant cooling, and hydronic HVAC systems. Available in both Normally Closed (NC) and Normally Open (NO) configurations, the 920039PL opens or closes a manifold valve in response to signals from a room thermostat or heating controller – giving precise, room-by-room temperature control across the entire system.
Compatible with multiple voltage options including 230V, 220V, 210V, 24V, and 12V, the 920039PL fits a wide range of system configurations. The housing is constructed from PA66 + 30% glass fiber reinforced material for durability, and the unit carries IP54 protection and meets EN 60730 standard. Adapter threads of M30x1.5mm and M28x1.5mm ensure compatibility with the most common manifold valve heads on the market.
Key Benefits
- Multiple voltage options – Available in 230V, 220V, 210V, 24V, and 12V to suit both European and global system standards without additional transformers
- NC and NO configurations – Choose Normally Closed for energy-saving fail-safe operation, or Normally Open for systems requiring default flow when power is off
- Low power consumption – Draws only 2W during operation, minimizing energy costs across multi-zone installations with many actuators
- High actuation force – Delivers 100 ± 10N of force, providing reliable valve opening and closing even on valves with higher spring resistance
- IP54 protection grade – Sealed against dust ingress and water splashing, suitable for installation in manifold boxes and utility areas
- EN 60730 compliant – Meets European standard for automatic electrical controls, ensuring safety and compatibility with certified heating systems
- Dual adapter compatibility – M30x1.5mm and M28x1.5mm threads fit the most widely used manifold valve heads from leading manufacturers
- Glass fiber reinforced housing – PA66 + 30% GF construction provides structural rigidity and long-term dimensional stability under thermal cycling
- OEM and ODM customization available – Voltage, control direction, adapter size, and cable length can be customized for specific product requirements
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 920039PL |
| Voltage | 230V / 220V / 210V / 24V / 12V |
| Control Direction | Normally Closed (NC) / Normally Open (NO) |
| Power Consumption | 2W |
| Working Temperature | -5°C to 60°C |
| Force | 100 ± 10N |
| Stroke | ≥ 4mm |
| Protection Grade | IP54 |
| Standard | EN 60730 |
| Adapter | M30x1.5mm / M28x1.5mm |
| Closing and Opening Time | 3 – 5 minutes |
| Housing Material | PA66 + 30% GF |
Application & Use Cases
- Underfloor heating systems – Mounted on manifold valves to open and close individual zone circuits in response to room thermostat signals, enabling room-by-room temperature control
- Radiant cooling systems – Controls chilled water flow through floor or ceiling circuits in zones that require independent cooling management
- Hydronic HVAC systems – Used in multi-zone water-based heating and cooling distribution systems where electrically-controlled zone isolation is required
- Fan coil unit systems – Regulates hot or chilled water supply to individual fan coil units based on thermostat demand
- District heating connections – Applied at zone-level valve positions where reliable, low-power electric actuation is needed for remote or automated control
- Smart home and building automation – Compatible with 24V control systems used in modern smart thermostats and building management systems
Installation Notes
- Select the correct adapter thread before installation – the 920039PL is compatible with M30x1.5mm and M28x1.5mm valve heads. Confirm the thread size on the manifold valve before ordering
- Choose Normally Closed (NC) for systems where the valve should default to closed when power is off, which is the most common configuration for underfloor heating zone control
- Choose Normally Open (NO) for systems where continuous flow is required as the fail-safe default, such as some district heating or gravity circulation configurations
- Ensure the supply voltage matches the actuator specification – do not mix voltage variants on the same wiring circuit
- The actuator does not require a separate power supply if wired directly to a compatible room thermostat output rated for the actuator’s voltage and current draw
- Mount the actuator vertically or horizontally on the valve head – the 920039PL is not position-sensitive during operation
- Allow the actuator sufficient space to complete its 3 to 5 minute opening and closing cycle without mechanical obstruction
- Do not install in environments where ambient temperature exceeds 60°C or falls below -5°C
- IP54 protection allows installation in manifold boxes and enclosed utility spaces, but the actuator must not be submerged or exposed to direct water jets
- For multi-zone systems with many actuators, ensure the thermostat or controller output is rated to handle the combined current load
Frequently Asked Questions
What is the difference between Normally Closed and Normally Open thermal actuators?
A Normally Closed (NC) actuator keeps the valve closed when no power is supplied and opens it when energized by a thermostat signal. A Normally Open (NO) actuator does the opposite – it holds the valve open at rest and closes it when energized. NC is the standard choice for underfloor heating zone control, as it stops water flow automatically during a power outage. NO configurations are used where maintaining flow by default is the safer operating condition.
Which voltage variant should I choose?
Select the voltage that matches your room thermostat or heating controller output. Most European residential systems use 230V actuators wired directly to the thermostat. Systems using a central heating controller or smart home platform often operate at 24V. The 12V variant is suited to low-voltage DC control systems. If unsure, check the output voltage specification of your thermostat or controller before ordering.
Which manifold valves is the 920039PL compatible with?
The 920039PL is compatible with manifold valve heads using M30x1.5mm or M28x1.5mm adapter threads. These are the two most common thread standards across major manifold manufacturers. If your manifold uses a different thread, contact the Legom team to discuss adapter options.
How long does the 920039PL take to open or close?
The actuator completes its opening or closing cycle in 3 to 5 minutes. This gradual actuation speed protects the valve seat and reduces hydraulic shock in the system compared to fast-acting solenoid valves.
Is the 920039PL compatible with smart thermostats?
Yes. When ordered in the 24V variant, the 920039PL is compatible with most 24V smart thermostats and building automation systems. The 230V variant is compatible with standard on/off thermostat outputs rated for the actuator’s load. Always verify the thermostat’s output rating against the actuator’s power consumption before installation.
Can the 920039PL be customized for different specifications?
Yes. Legom offers full OEM and ODM customization including voltage, control direction, adapter thread size, cable length, and housing color. Contact our team to discuss your project requirements.
OEM & ODM Customization
Legom supports full OEM and ODM services for the 920039PL Thermal Actuator. Our engineering team can customize voltage rating, control direction, adapter thread size, cable length, and housing specifications to match your product requirements. All customization projects are handled with strict confidentiality. Contact us via WhatsApp or info@legomsmart.com.
Product information last reviewed by the Legom Technical Team. For the most current specifications, refer to the official datasheet or contact our sales team.
Custom OEM & ODM Solutions
Legom is a direct manufacturer offering end-to-end OEM and ODM services. With our in-house engineering and production capabilities, we work closely with distributors and system integrators to deliver fully customized solutions under strict NDA.
