Electrothermal heads are essential components in hydronic systems where precise flow control is required. They are commonly used in commercial and residential buildings to regulate the operation of balancing valves in heating and sanitation systems. Installers and technicians often encounter these devices in HVAC systems, where they ensure accurate modulation of flow rates to maintain system balance and efficiency. The integration of electrothermal heads into such systems allows for automated control based on thermal demand, reducing manual adjustments and improving overall system performance.

These heads are typically installed in conjunction with motorised balancing valves, where they act as actuators responding to temperature or control signals. The system compatibility is crucial, as the electrothermal head must align with the valve's specifications and the control system's requirements. Proper installation ensures that the system operates within its design parameters, maintaining stable flow and preventing issues such as over- or under-supply of heat to specific zones.

Technical parameters

Weight	0.62 kg
Code	311024NO
Brand	IVAR

The technical parameters of this electrothermal head are critical for correct sizing and system integration. The M30 x 1.5 ensures compatibility with the designated valve model, while the time constant of 5 minutes indicates the speed at which the head responds to control signals. The IP54 rating confirms that the device is protected against dust and splashes, making it suitable for use in environments with moderate exposure to moisture and particulates.

Installation and connection

The electrothermal head is installed directly onto the IVAR.CIM 788 balancing valve using the M30 x 1.5 thread. Before installation, ensure the valve is fully closed and the system is depressurised. The connection should be tightened to the manufacturer’s recommended to prevent leaks or misalignment. A common mistake during installation is using an incorrect thread type or applying excessive force, which can damage the valve or head. After installation, verify the electrical connection to the control system and test the head's response to a signal to confirm correct operation.

Compatibility and accessories

This electrothermal head is specifically designed for use with the IVAR.CIM 788 balancing valve and is not compatible with other valve models. For full system functionality, it must be connected to a compatible control system that provides 24V power and appropriate control signals. No additional accessories are required for standard operation, but system designers should ensure that the control system is configured to match the head's specifications.

Technical background for designers

The electrothermal head operates by converting electrical energy into thermal energy, which is used to actuate the valve. The head's material is selected for durability and resistance to thermal cycling, ensuring long-term reliability in fluctuating temperature conditions. The integration into the system depends on the control logic and the valve's flow characteristics. The time constant of 5 minutes affects how quickly the head responds to changes in demand, which is important for maintaining system stability and efficiency. The IP54 rating ensures that the device can be installed in environments where it may be exposed to dust and water splashes, but it is not suitable for fully submerged or high-pressure conditions.

Service and operation

The electrothermal head requires minimal maintenance under normal operating conditions. Regular visual inspections should be carried out to check for signs of wear, , or damage to the electrical connections. The system should be tested periodically to ensure that the head responds correctly to control signals. If the head fails to operate as expected, the electrical supply and control signals should be checked first. No specific service intervals are provided in the technical data, but any issues should be addressed promptly to prevent system imbalance or inefficiency.

Frequently asked questions

Can this electrothermal head be used with other valve models?
No, it is specifically designed for the IVAR.CIM 788 balancing valve and is not compatible with other models.

What is the significance of the time constant of 5 minutes?
The time constant indicates how quickly the head responds to control signals. A 5-minute time constant means the head will reach its full actuation after this period under standard conditions.

Is this head suitable for use in outdoor installations?
The IP54 rating provides protection against dust and water splashes, making it suitable for use in semi-protected outdoor environments. However, it is not recommended for fully exposed or submerged installations.

Can this head be used in a 24V DC control system?
Yes, the head is designed to operate with a 24V power supply and is compatible with standard 24V DC control systems.