Electrothermal heads are essential components in hydronic systems where precise flow control is required. They are commonly used in commercial and residential heating installations to regulate the flow of water through balancing valves. Installers and service technicians typically work with these devices in systems where thermal expansion and temperature control are critical. The integration of electrothermal heads ensures that the system maintains stable and efficient operation, especially in applications with variable load conditions.

When installing or servicing such systems, it is important to understand the role of the electrothermal head in the overall system dynamics. It acts as a thermal actuator, responding to temperature changes by adjusting the position of the balancing valve. This helps in maintaining the desired flow rate and ensures that the system remains balanced under different operating conditions. The device is particularly suited for use in systems where manual adjustment is impractical or insufficient.

Technical parameters

Weight	0.67 kg
Code	311230NO
Brand	IVAR

The technical parameters of this electrothermal head are crucial for proper sizing and system compatibility. The M30 x 1.5 ensures a secure and standardised connection to the balancing valve. The time constant of 3 minutes indicates the of the actuator to temperature changes, which is important for system stability. The IP54 rating ensures protection against dust and splashing water, making it suitable for use in typical indoor environments.

Installation and connection

Installation of the electrothermal head requires careful attention to the connection dimensions and the orientation of the device. The M30 x 1.5 thread must be aligned with the corresponding port on the IVAR.CIM 788 balancing valve. Prior to installation, the technician should verify that the valve is correctly positioned and that the thermal head is compatible with the system's operating conditions. A common mistake is incorrect thread engagement, which can lead to leaks or improper operation. It is also important to ensure that the electrical supply is disconnected during installation to prevent accidental activation.

Compatibility and accessories

This electrothermal head is specifically designed for use with the IVAR.CIM 788 balancing valve and is not compatible with other models. It is supplied without an electrical current open function, which must be considered when designing the control system. No additional accessories are required for basic operation, but the system should be checked for compatibility with the overall control strategy and any associated sensors or controllers.

Technical background for designers

The electrothermal head operates by using a thermal element that expands or contracts in response to temperature changes. This movement is transferred to the valve stem, adjusting the flow rate accordingly. The materials used in the construction of the head are selected for their thermal stability and resistance to corrosion, ensuring long-term reliability. The integration of the head into the system must account for the time constant and the thermal response of the entire system to avoid instability or overshooting of the desired flow rate.

Service and operation

Regular inspection of the electrothermal head is recommended to ensure that it remains free from debris and that the connection to the valve is secure. The IP54 rating provides protection against dust and water, but in environments with high humidity or chemical exposure, additional precautions may be necessary. There are no specific service intervals provided in the brief, but any signs of mechanical wear or electrical faults should be addressed promptly to prevent system failure.

Frequently asked questions

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

What is the significance of the time constant of 3 minutes?
The time constant indicates how quickly the head responds to temperature changes, which affects the system's ability to maintain a stable flow rate.

Is it possible to retrofit this electrothermal head onto an existing balancing valve?
Only if the existing valve is an IVAR.CIM 788 and has the correct M30 x 1.5 connection. Otherwise, it is not compatible.

What does the IP54 rating mean for the installation location?
It means the head is protected against dust and splashing water, making it suitable for indoor use in typical environments.