Thermal Actuator 920059PL
The 920059PL Thermal Actuator is a Normally Closed electrothermal valve actuator designed for underfloor heating manifolds and hydronic zone control. Manufactured by Legom with a durable glass-fiber reinforced PA66+30%GF housing, it converts a low-voltage control signal from a room thermostat into smooth, silent valve actuation, delivering an operating force of 100±10N and a stroke of ≥4mm while drawing only 2W of power.
Offered across a wide range of voltage versions and built to the EN 60730 standard for automatic electrical controls, the 920059PL fits standard manifold valves through an M30x1.5mm adapter. Its Normally Closed action shuts off flow whenever power is removed, making it a safe default for underfloor heating, and its 3 to 5 minute opening and closing time provides the gradual, wear-free control that thermal actuators are valued for in residential and commercial heating systems.
Key Benefits
- Normally Closed fail-safe action – The valve closes automatically when power is lost, stopping flow to the circuit, which is the preferred safe default for underfloor heating and zone control
- Wide voltage range – Available in multiple versions to match mains-powered and low-voltage control systems from a single product family
- Low 2W power consumption – Minimal holding load keeps energy use down across multi-zone manifolds running many actuators in parallel
- Silent, wear-free actuation – The thermal operating principle uses no motor or solenoid, giving quiet operation and long service life with no mechanical switching wear
- EN 60730 compliant – Meets the international standard for automatic electrical controls for household and similar use
- Standard M30x1.5mm adapter – Fits the majority of underfloor heating manifold valves and common zone valve bodies without custom hardware
- IP41 protection grade – Suited to protected indoor manifold and cabinet locations
- PA66+30%GF housing – Glass-fiber reinforced nylon resists heat and mechanical stress for reliable performance in warm manifold environments
- OEM and ODM customization available – Voltage, adapter thread, cable length, and housing can be adapted to specific product and market requirements
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 920059PL |
| Voltage | 230V / 220V / 210V / 4V / 12V (version dependent) |
| Control Direction | Normally Closed (NC) |
| Power Consumption | 2W |
| Working Temperature | -5°C to 60°C |
| Force | 100±10N |
| Stroke | ≥4mm |
| Protection Grade | IP41 |
| Standard | EN 60730 |
| Adapter | M30x1.5mm |
| Closing and Opening Time | 3 to 5 minutes |
| Housing Material | PA66+30%GF |
Specifications are typical values for the standard configuration. The voltage supplied depends on the ordered version. Refer to the user manual for complete wiring details and dimensional drawings.
Application & Use Cases
- Underfloor heating manifolds – The primary application, where one actuator per loop opens and closes the manifold valve in response to each zone thermostat, enabling room-by-room temperature control
- Zone valve control – Drives manifold-mounted and two-port zone valves in multi-zone hydronic systems, switching flow to individual circuits on demand
- Radiator and HVAC valves – Actuates control valves in heating and cooling distribution assemblies that use an M30x1.5 valve interface
- Fan coil units – Controls water flow to fan coils in commercial HVAC installations for on/off zone regulation
- Thermostat-driven systems – Wired to room thermostats or heating controllers, translating the call-for-heat signal into valve movement with no external motor or linkage
Installation Notes
- Mount the actuator on a compatible valve using the M30x1.5mm adapter. Confirm the valve thread before installation
- Match the voltage version to the control system supply. Applying the wrong voltage can damage the actuator
- Because the actuator is Normally Closed, the valve remains shut until the actuator is energized. Verify this matches the intended control logic for the zone
- Allow for the 3 to 5 minute opening and closing time. Thermal actuators are slow-acting by design and do not respond instantly like solenoid valves
- Observe the IP41 rating. The unit is protected against vertically dripping water only and must be installed in a dry, protected indoor location, not exposed to spray or outdoor conditions
- Wire the unit in accordance with EN 60730 and local electrical regulations, and keep it within the -5°C to 60°C ambient working range
- Install the actuator in the recommended upright orientation on the valve to ensure reliable operation and correct ingress protection
- For OEM integration, confirm two key parameters in writing before finalizing the order: voltage and adapter thread
Frequently Asked Questions
What does Normally Closed mean, and why is it used for underfloor heating?
A Normally Closed (NC) actuator keeps the valve closed when it is not powered and opens only when energized. If power is lost, flow to the circuit stops automatically. This fail-safe behavior is the preferred default for underfloor heating, since it prevents unwanted heating when the control system is off or has failed.
Why does the actuator take 3 to 5 minutes to open or close?
Thermal actuators operate by heating an internal expansion element rather than using a motor or solenoid, so movement is gradual by design. This slow, silent, wear-free actuation is ideal for underfloor heating, where rapid switching is unnecessary and smooth flow control improves comfort and valve life.
Which valves is the 920059PL compatible with?
The actuator connects through an M30x1.5mm adapter, which fits the majority of underfloor heating manifold valves and common zone valve bodies. Confirm that your valve uses the M30x1.5 thread before ordering.
Which voltage version should I order?
The 920059PL is available in several voltage versions. Select the one that matches the output of your thermostat, wiring center, or heating controller. If you are integrating the actuator into a larger system, our team can advise on the correct voltage for your setup.
Where can the 920059PL be installed given its IP41 rating?
The IP41 rating means the actuator is protected against solid objects larger than 1mm and against vertically dripping water. It is intended for dry, protected indoor locations such as a manifold cabinet or utility space, and should not be installed where it may be exposed to spray, jets, or outdoor weather.
Can the 920059PL be customized for OEM projects?
Yes. Legom offers full OEM and ODM services. Voltage, adapter thread, cable length, and housing details can be adapted to your product requirements. Written confirmation of two key parameters is required before a customization project begins: voltage and adapter thread. Contact us via WhatsApp or email to start the process.
OEM & ODM Customization
Legom supports full OEM and ODM services for the 920059PL Thermal Actuator. Our engineering team can customize the voltage version, adapter thread, cable length, and housing to match your product requirements. Before any commitment, written confirmation of two key parameters is required: voltage and adapter thread. All customization projects are handled with strict confidentiality. Contact us via WhatsApp or info@legomsmart.com.
User Manual
Product information last reviewed by the Legom Technical Team. For the most current specifications, refer to the official user manual 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.
