Thermoregulating unit - with pump and non-return valve - DN 25; 80 °C IVAR.TERMOVAR-M

Product detailed description

Thermoregulating units with integrated pumps are essential components in modern heating systems, particularly in installations requiring precise temperature control and boiler protection. These units are commonly found in residential and commercial buildings where solid fuel boilers are used. Installers and technicians working on such systems often encounter requirements for maintaining stable output temperatures while preventing condensation and corrosion within the boiler. This unit is designed to address these challenges by combining a thermoregulating element with a circulation pump and non-return valve.

The unit is suitable for integration into central heating systems, especially those with solid fuel boilers. It ensures a consistent temperature output and helps prevent low-temperature corrosion by maintaining minimum return temperatures. The system is typically installed between the boiler and the heating circuit, allowing for the separation of boiler water from the distribution circuit. This configuration supports the use of a secondary circuit, which is crucial for protecting the boiler from thermal stress and condensation.

Technical parameters

Installation and connection

Installation should be carried out by a qualified technician following the manufacturer's guidelines. The unit is connected using standard DN 25 threaded connections, which must be verified for compatibility with the existing piping system. Prior to installation, the system should be drained and flushed to remove debris that could damage the internal components. The pump should be positioned with adequate clearance for maintenance access and with a slope to allow for proper drainage. Common installation errors include incorrect orientation of the non-return valve, improper pump alignment, and failure to secure all connections properly. After installation, the system should be tested for leaks and correct operation of the pump and temperature regulation.

Compatibility and accessories

This thermoregulating unit is compatible with standard heating systems and solid fuel boilers. It includes three ball valves and three temperature gauges, allowing for system isolation and monitoring. The Grundfos UPM3 AUTO L-50 circulation pump is pre-installed and must be checked for correct flow rate and pressure during commissioning. Additional accessories such as expansion vessels, pressure relief valves, and system controllers may be required depending on the overall system design. No specific related products are listed for this model.

Technical background for designers

The unit operates by regulating the temperature of the fluid passing through the heating circuit. The thermoregulating element adjusts the flow based on temperature feedback, ensuring a constant output temperature. The body is made of DZR brass, a material known for its corrosion resistance and durability in hot water environments. The unit is designed to integrate seamlessly with solid fuel boilers, where it acts as a buffer to maintain minimum return temperatures and prevent condensation. The service life and efficiency of the unit depend on the quality of the installation, regular maintenance, and the stability of the system's operating conditions.

Service and operation

Periodic inspection of the unit is recommended to ensure continued performance. The pump should be checked for unusual noise, vibration, or overheating. The non-return valve and ball valves should be inspected for leaks and proper operation. The temperature gauges should be verified for accuracy. No specific service intervals are provided in the technical documentation. If issues arise, the unit should be isolated using the ball valves and inspected for blockages, worn seals, or damaged components. The Grundfos pump has a self-priming feature but may require manual priming if the system has been drained.

Frequently asked questions

Can this unit be used with a condensing boiler?
It is not recommended for use with condensing boilers due to the risk of condensation forming in the unit, which could lead to corrosion and reduced efficiency.

What is the function of the non-return valve in this unit?
The non-return valve prevents backflow of fluid from the heating circuit into the boiler, ensuring that the boiler remains isolated and protected from thermal shock.

Is the circulation pump adjustable for different flow rates?
The Grundfos UPM3 AUTO L-50 pump is designed for automatic flow adjustment based on system demand, but manual settings are not available for this model.

Can the thermoregulating element be replaced separately?
Yes, the thermoregulating element is a replaceable insert, allowing for maintenance without the need to replace the entire unit.