Electronic actuator DANFOSS Thermot NO 24V model 088H3218 for valves, normally open, 24 V

DANFOSS Thermot NO 24V electronic actuator model 088H3218 is a normally open electric actuator designed to automate valve operation in HVAC and industrial process systems. Powered by a 24 V supply, it converts electrical control signals into linear motion to open or close compatible valves, enabling remote and scheduled control. The unit is intended for retrofit or new installations where reliable, electrically driven valve actuation is required and where a normally open fail-safe behavior is preferred.

Advantages

The actuator offers compact construction and straightforward mounting to a range of valve bodies, ensuring minimal installation footprint. Its 24 V operation allows integration with standard building automation controllers and low-voltage control circuits. The normally open configuration ensures valves default to the open position in the absence of power, which can be important for specific HVAC or process safety strategies. The design emphasizes consistent stroke control and repeatable positioning for stable flow regulation.

Suitable for

• Automated control of heating, cooling and ventilation valves in HVAC systems
• Retrofit projects converting manual valves to electric actuation
• Process applications requiring normally open valve fail-safe behaviour
• Integration with building management systems and low-voltage controllers

Key specifications

• Operating voltage: 24 V (AC/DC compatible where specified by system)
• Actuator type: normally open (NO) electric linear actuator
• Intended function: motorized valve position control for regulation and on/off operation
• Mounting: direct-mount interface compatible with DANFOSS Thermot valve series
• Control input: electrical command signal for opening and closing the valve
• Environmental suitability: designed for indoor mechanical and HVAC installations

How to use

Mount the actuator onto the compatible valve following manufacturer mounting instructions and ensure correct alignment between actuator spindle and valve stem. Connect the 24 V supply and control wiring according to the system wiring diagram, verifying polarity and control signal type. After electrical connection, perform initial commissioning by exercising the actuator through its full stroke to confirm smooth movement and correct end positions. Adjust any mechanical end stops or settings on the valve as required to achieve the desired flow control.

Usage recommendations

Use the actuator with compatible DANFOSS Thermot valves or other valves explicitly specified as compatible. Ensure the control voltage is stable and protected against overvoltage. For reliable operation, install the actuator in dry, accessible locations and follow regular inspection for wiring integrity and mounting torque. When planning fail-safe behaviour, confirm that the normally open configuration aligns with system safety requirements.