SIRO Stepping Motor NC

230V NC Mini actuator for heating valves

The SIRO Mini actuator uses an advanced wax-PTC element for virtually silent operation and long-lasting reliability. As a compact heating actuator, it blends inconspicuously into any system installation and ensures trouble-free valve movements.

Precise control with travel distance and position display.

With a 4.5 mm stroke and a maximum tensile force of 110 N, this valve actuator enables precise control of thermostat and 2/4-way valves. The integrated position indicator clearly displays the current travel path at all times and ensures maximum control.

Automatic spring return in case of power failure

The integrated spring return function closes the valve immediately as soon as the power supply is interrupted. This NC actuator thus provides reliable protection for your underfloor heating circuit and prevents unwanted flooding in the event of a power failure.

Robust IP54 protection rating and double insulation

Designed to protection class II with double insulation and an IP54 housing, the mini actuator withstands dust, splashing water and humid environments. This high protection rating makes the actuator ideal for long-term use in heating and industrial environments.

Compact design and easy assembly

With dimensions of only 62 × 30 × 39 mm and a 100 cm connecting cable, the actuator fits even into tight back spaces. The tool-free mounting via nut connection enables quick replacement and uncomplicated installation without special tools.

Our WEEE registration number is: WEEE-Reg.-Nr. DE59943004

* No guarantee given

Scope of delivery

• 1xActuator

Technical Details

• Supply voltage:230V AC
• Type of operation:NC (normally closed)
• Protection class:IP54
• Insulation:Protection class 2 (double insulation)
• Dimensions:62 x 30 x 39 mm
• Connecting cable:1m
• Assembly:Mother's nipple
• Operating temperature range:-5°C to +60°C

Frequently Asked Questions about the SIRO Actuator NC:

How do I connect the SIRO Actuator NC to my existing wires?

You connect the SIRO Actuator NC directly to the 230V connections of your heating system. The exact wiring diagram can be found in the included instruction manual – typically you only need phase and neutral for connection.

Is the actuator suitable for my 230V normally closed valves?

Yes, the SIRO Actuator NC is specifically designed for 230V normally closed (NC) valves. It opens the valve when power is supplied and closes it automatically when power is off.

How many watts does the SIRO Actuator NC consume during operation?

The actuator requires about 2-3 watts during the opening phase. When open, power consumption is reduced to less than 1 watt, making it particularly energy-efficient.

Can I use the actuator without Wi-Fi?

The SIRO Actuator NC also works without a Wi-Fi connection if you operate it with a conventional room thermostat. However, the smart functions and app control will not be available.

What does the IP54 protection class mean for installation?

The IP54 classification means that the actuator is protected against dust and can withstand splashing water from all directions. This means you can use it without hesitation even in damp rooms such as bathrooms.

Which room thermostats are compatible with the SIRO Actuator NC?

The actuator works with all 230V room thermostats. It works optimally with the SIRO Smart Room Thermostat, but other Smart-Life compatible thermostats also enable full functionality.

How long does it take to install the actuator?

Mounting on the valve takes only a few minutes – simply screw it on and connect the electrical connections. Setup in the Smart Life app takes another 5-10 minutes.

Can the underfloor heating be switched off for a longer period?

With the SIRO Actuator NC, you can switch off the heating in unused rooms for any length of time. Individual room control allows each room to be controlled individually, thus saving energy.

User Manual