Three-position actuator Termojet 230 V (60 sec.) 405N

Termojet 405N actuator is a motorized servo-actuator for 3- and 4-way rotary mixing valves in heating systems. Supply voltage 230V AC, control type — 3-point (SPDT), torque 6 Nm, full travel time at 90° — 60 seconds, protection class IP42, power consumption 5 W. Manual control — provided. Compatible with Termojet valves DN20–DN50 and most standard mixing valves from leading manufacturers.

Technical Specifications

Operating Principle

The 3-point (floating) control type means three wires: common, "open" and "close". The controller applies 230V to the corresponding input — the actuator rotates the disc in the required direction. When the signal is removed, the motor stops and the disc is held in the current position. Full travel time from 0° to 90° — 60 seconds. This provides smoother control compared to faster actuators — water hammer in the system is minimal. The manual handle allows the disc to be turned to any position manually when de-energized.

Applications

• 3-way mixing valves DN20–DN50. Standard choice for boiler rooms with a 3-position controller output: supply temperature control for underfloor heating or radiator circuits.
• 4-way valves for boiler protection. Return line protection control for solid-fuel or gas boilers from a controller with a 3-point output.
• Simple schemes without weather-compensated automation. Boiler + one mixing valve + controller with 3-position output — the most common configuration in Ukraine.
• Replacement of a faulty or outdated actuator. Standard mounting compatible with most valves from leading manufacturers without additional adapters.

Advantages of Termojet 405N

• Torque 6 Nm — with a twofold reserve for DN20–DN32 valves (closing torque below 3 Nm) and sufficient reserve for DN40–DN50 (below 5 Nm).
• Travel time 60 s — smooth control without water hammer in the system.
• IP42 — protection against drips and dust, reliable operation in boiler room conditions.
• 5 W consumption — minimal power consumption in position-holding mode.
• Manual control — convenient adjustment and emergency positioning without power.

Compatible Valves

Termojet 405N actuator is suitable for automating the following valves:

• 3-way mixing valve DN20 Kvs 2.5
• 3-way mixing valve DN25 Kvs 6
• 3-way mixing valve DN32 Kvs 12
• 3-way mixing valve DN40 Kvs 18
• 4-way mixing valve DN25 Kvs 12
• 4-way mixing valve DN32 Kvs 18

Actuator and Heat Pump

If your system is controlled by a weather-compensated controller or a heat pump controller with an analog 0–10V output — consider the Termojet 411 actuator (0–10V, 24V). For systems with a 3-position controller output, the 405N actuator is the optimal choice. Learn more about heat pump wiring diagrams on the Termojet heat pumps website.

Frequently Asked Questions

Which signal type to choose: 3-point (405N) or 0–10V (411)?
It depends on the controller. If you have a boiler controller or heating controller with an open/close output — 405N (3-point). If you have a weather-compensated controller or a "smart home" with an analog output — 411 (0–10V). Clarify the output type of your controller before ordering.

Is the 405N compatible with valves from other manufacturers?
Termojet 405N actuator has a standard mounting compatible with most 3- and 4-way rotary valves from various manufacturers. Check the seat size and valve rotation angle (90°). All Termojet valves in the DN20–DN50 series are compatible without adapters.