Thermoregulating unit - with pump and non-return valve - DN 32; 80 °C IVAR.TERMOVAR-M

Product detailed description

Thermoregulating units with integrated pump and non-return valve are essential components in modern heating systems where precise temperature control and boiler protection are required. These units are commonly installed in residential and commercial buildings with heating systems based on solid fuel boilers, such as wood or pellet-fired units. Installers typically encounter these devices in central heating circuits where return temperatures need to be maintained at a minimum level to prevent condensation and corrosion inside the boiler. The unit ensures continuous circulation of the heat transfer medium even when the boiler is not in active operation.

In multi-room systems or larger properties, this type of unit helps maintain thermal stability and supports the efficient operation of the overall heating circuit. It is particularly suited for systems where the return water temperature can drop below safe levels during periods of low demand. The unit’s design includes a built-in non-return valve to prevent backflow and a circulation pump to maintain flow rates. The integration of these functions into a single compact unit simplifies installation and reduces the need for additional components.

Technical parameters

Material	Brass DZR
Operating temperature	+110 °C
Maximum power	65 kW
Nominal pressure	PN 6
Supply voltage	230 V
Weight	5 kg
Code	1400343
Brand	IVAR

The technical parameters define the operational limits and performance characteristics of the thermoregulating unit. The maximum power of 65 kW indicates the capacity of the unit to manage heat transfer within a given system size. The operating temperature of +110 °C allows the unit to function effectively in high-temperature environments typical of solid fuel boilers. The nominal pressure rating of PN 6 ensures compatibility with standard heating system piping and components. These parameters are critical for correct system sizing and to ensure long-term reliability.

Installation and connection

To install the thermoregulating unit, first ensure the heating circuit is depressurised and the power supply is disconnected. Position the unit in the return line of the heating circuit, ensuring correct orientation of the non-return valve. The unit features a DN 32 connection, typically using threaded (R or G) or flanged connections depending on the system configuration. Verify that the pump is wired correctly to a 230 V, 50/60 Hz power supply, and that all electrical connections are made in accordance with local regulations. Common installation errors include incorrect positioning relative to the boiler, improper alignment of the non-return valve, or failure to isolate the unit during maintenance. Always check for proper flow direction and ensure that the unit is fully accessible for future servicing. After installation, test the system for leaks and verify that the pump operates without unusual noise or vibration.

Compatibility and accessories

The unit is compatible with standard heating systems operating under PN 6 pressure conditions. It is designed for use with solid fuel boilers and should be integrated into the return circuit to ensure consistent flow and temperature control. Additional components such as expansion vessels, pressure relief valves and temperature sensors may be required depending on the system configuration. While no specific alternative or related products are listed, the unit is intended for use with Grundfos UPM3 AUTO L-50 circulation pumps, which are included in the package.

Technical background for designers

The thermoregulating unit operates by maintaining a constant minimum return temperature through controlled circulation. The built-in circulation pump ensures continuous flow, while the non-return valve prevents reverse flow that could compromise system performance. The body is constructed from DZR brass, a material known for its resistance to corrosion and mechanical strength in hot water environments. This makes the unit suitable for long-term operation in aggressive chemical conditions, such as those found in systems with high mineral content or fluctuating pH levels. The unit integrates into the system via standard pipe connections and is typically placed between the boiler and the main heating circuit. The effectiveness of the unit depends on proper sizing of the pump and accurate matching of the system’s hydraulic requirements. Long-term performance is influenced by the quality of the heat transfer medium, the presence of impurities and the frequency of maintenance checks.

Service and operation

The unit requires periodic inspection to ensure continued performance. Check the pump for unusual noise or vibration and verify that the non-return valve operates smoothly without sticking. Clean the internal components as necessary to remove sediment or debris that could affect flow. Inspect the electrical connections for signs of wear or overheating. As no specific service interval is provided, it is recommended to follow the manufacturer’s guidelines for routine maintenance.

Frequently asked questions

Can the thermoregulating unit be connected to a solid fuel boiler?
Yes, the unit is specifically designed for integration with solid fuel boilers to prevent low-temperature corrosion and soot accumulation.

What is the maximum power capacity of the unit?
The unit has a maximum power of 65 kW, making it suitable for medium-sized heating systems.

Is the unit compatible with Grundfos UPM3 AUTO L-50 circulation pumps?
Yes, the unit includes a Grundfos UPM3 AUTO L-50 pump as part of its standard configuration.

Can the unit be used in systems with varying return temperatures?
Yes, the unit maintains a constant output temperature and is suitable for systems where return temperatures may fluctuate.