Three-position actuator Termojet 401N 230 V (120 sec.) AQUA401-3-230-120

Termojet 401N actuator is a compact motorized servo-actuator for 3- and 4-way rotary mixing valves. Supply voltage 230V AC, control type — 3-point (ON/OFF), torque 6 Nm, full travel time 90° — 120 seconds, protection class IP42. Designed for use with boiler controllers that have a standard 3-position open/close output. Power consumption — no more than 5 W.

Technical Specifications

Operating Principle

The actuator connects to the boiler controller with three wires: common (N), "open" and "close". When 230V AC is applied to one of the control inputs, the motor rotates the shaft in the corresponding direction — the valve moves. When the signal is removed, the shaft stops and holds the current position. The built-in indicator shows the current valve position. The unlock button allows manual rotation of the shaft — convenient during commissioning or an emergency without de-energizing the actuator.

Applications

• Underfloor heating mixing units. The 401N actuator controls the 3-way mixing valve DN25 paired with a standard boiler controller — maintains the set supply temperature to the floor heating circuit.
• Solid-fuel boiler protection. In a scheme with the 4-way valve DN32, the actuator automatically blends hot supply into the return line — preventing cold water from reaching the boiler.
• Boiler rooms with 3-position controllers. The 401N is the standard choice for systems where the controller has an open/close output at 230V AC: most boiler manufacturers use exactly this type of output.
• Radiator and mixed systems. Valves DN15–DN50 with a closing torque below 5 Nm — all within the actuator's 6 Nm range.
• On-site manual adjustment. The built-in unlock button and handle allow manual adjustment of the valve position without dismounting the actuator.

Advantages of Termojet 401N

• Standard 230V AC power supply — no transformers or additional power units, direct connection to the mains.
• 6 Nm with CE and RoHS certificates — reliability and compliance with safety requirements.
• Compact size — easy to install in narrow boiler room cabinets and distribution panels.
• Manual control without dismounting — convenient during commissioning and maintenance.
• Compatible with valves from leading manufacturers — standard mounting flange.

Actuator and Heat Pump

In systems with a heat pump, the 401N actuator can control a mixing valve to maintain the optimal supply temperature to the circuits. If your heat pump has an analog 0–10V output, consider the Termojet 411 actuator (0–10V, 24V) — it provides smoother proportional control for maximum efficiency. Learn more about controlling heating systems with a heat pump on the Termojet heat pumps website.

Frequently Asked Questions

What is the difference between the 401N and 405N actuators?
Both are 3-point, 230V, 6 Nm. The 401N has a travel time of 120 seconds — for systems requiring smoother, slower control (large circuits, high thermal inertia). The 405N — 60 seconds — for systems requiring faster response.

Does the 401N connect to any boiler controller?
Yes, provided the controller has a standard 3-position open/close output at 230V AC. This is the most common output type for controlling mixing valves. If the controller has an analog 0–10V output or 24V supply — the Termojet 411 is suitable.