Thermal Actuator 920018PL
The 920018PL Thermal Actuator is an electrothermal valve actuator built for underfloor heating manifolds and zone control, distinguished by two commissioning-friendly features: a manual opening function and a visual position indicator. Manufactured by Legom with a glass-fiber reinforced PA66+30%GF housing, it converts a low-voltage control signal from a room thermostat into precise valve actuation, delivering an operating force of 100±10N and a stroke of ≥4mm while drawing only 2W of power.
Available in 230V, 24V, and 12V versions and in both Normally Closed and Normally Open configurations, the 920018PL adapts to almost any hydronic control logic. It carries an IP54 protection rating, complies with the EN 60730 standard for automatic electrical controls, and fits standard manifold valves through M30x1.5mm or M28x1.5mm adapters. With an opening and closing time of 3 to 5 minutes, it provides the smooth, silent, wear-free actuation that thermal actuators are valued for across residential and commercial heating systems.
Key Benefits
- Manual opening function – Allows the valve to be opened by hand during system filling, flushing, and commissioning before the actuator is wired or powered, simplifying installation and leak testing
- Visual position indicator – A clear open/closed indicator lets installers and service technicians confirm the actuator state at a glance without instruments or disassembly
- Three voltage versions – Supplied in 230V, 24V, and 12V to match mains-powered, transformer-based, and low-voltage control systems from a single product family
- Normally Closed and Normally Open options – Both control directions are available, so the actuator suits either fail-safe-closed or fail-safe-open zone logic
- Low 2W power consumption – Minimal standby and holding load keeps energy use down across multi-zone manifolds with many actuators running in parallel
- IP54 protection grade – Dust and splash protection makes the unit suitable for the typical manifold cabinet and utility-room environment
- EN 60730 compliant – Meets the international standard for automatic electrical controls for household and similar use
- Standard M30x1.5mm / M28x1.5mm adapters – Fits the vast majority of underfloor heating manifold valves and common zone valve bodies without custom hardware
- PA66+30%GF housing – Glass-fiber reinforced nylon resists heat and mechanical stress for long service life in warm manifold locations
- OEM and ODM customization available – Voltage, control direction, adapter thread, and housing can be adapted to specific product and market requirements
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 920018PL |
| Voltage | 230V / 24V / 12V (version dependent) |
| Control Direction | Normally Closed / Normally Open |
| 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 to 5 minutes |
| Housing Material | PA66+30%GF |
| Special Features | Manual opening, position indicator |
Specifications are typical values for the standard configuration. Voltage and control direction depend on the ordered version. Refer to the official datasheet for complete wiring diagrams 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 two-port and manifold-mounted zone valves in multi-zone hydronic systems, switching flow to individual circuits on demand
- Radiator and HVAC valves – Actuates thermostatic and control valves in heating and cooling distribution assemblies that use an M30x1.5 or M28x1.5 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 without any external motor or linkage
Installation Notes
- Mount the actuator on a compatible valve using the correct M30x1.5mm or M28x1.5mm adapter. Confirm the valve thread before installation
- Use the manual opening function to hold the valve open during system filling, flushing, and pressure testing, then release it before energizing the actuator
- Match the voltage version (230V, 24V, or 12V) to the control system supply. Applying the wrong voltage can damage the actuator
- Select the correct control direction (Normally Closed or Normally Open) for the intended fail-safe behavior of 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 IP54 rating. The actuator is protected against dust and splashing water but must not be submerged or installed in fully exposed outdoor locations
- 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
- Check the position indicator after commissioning to confirm each actuator reaches its intended open or closed state
- For OEM integration, confirm three key parameters in writing before finalizing the order: voltage, control direction, and adapter thread
Frequently Asked Questions
What is the difference between the Normally Closed and Normally Open versions?
A Normally Closed (NC) actuator keeps the valve closed when it is not powered and opens when energized, which is the most common choice for underfloor heating because flow stops if power is lost. A Normally Open (NO) actuator keeps the valve open when de-energized and closes when powered. Choose the version that matches the fail-safe behavior your control system requires. The 920018PL is available in both configurations.
What does the manual opening function do?
The manual opening function lets the installer open the valve by hand without electrical power. This is useful during system filling, flushing, and pressure testing before the actuator is wired, and as a temporary override during service. Remember to release it before normal operation so the actuator can control the valve.
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 920018PL compatible with?
The actuator connects through M30x1.5mm or M28x1.5mm adapters, which fit the majority of underfloor heating manifold valves and common zone valve bodies. Confirm the thread size of your valve before ordering to ensure the correct adapter version.
Which voltage version should I order?
The 920018PL is available in 230V, 24V, and 12V. Select the version 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.
Can the 920018PL be customized for OEM projects?
Yes. Legom offers full OEM and ODM services. Voltage, control direction, adapter thread, cable length, and housing details can be adapted to your product requirements. Written confirmation of three key parameters is required before a customization project begins: voltage, control direction, 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 920018PL Thermal Actuator. Our engineering team can customize the voltage version, control direction, adapter thread, and housing to match your product requirements. Before any commitment, written confirmation of three key parameters is required: voltage, control direction, and adapter thread. 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.
