Boiler module HEAT BLOC K34 - 3-way mixing valve - DN 32; without pump PAW.K34-DN 32

Product detailed description

Boiler modules are essential components in modern heating systems, particularly in residential and commercial buildings where precise temperature regulation and efficient heat distribution are required. This model is commonly used in systems where a boiler’s high-temperature output must be mixed with return water to maintain safe and consistent supply temperatures. Installers working on such systems often encounter challenges related to flow balancing and system integration, making the correct selection and installation of a boiler module critical for long-term performance.

When integrating a boiler module into a heating system, the installer must consider the overall system design, including the presence of a separate circulation pump, the need for thermal insulation, and the compatibility of the control system. The HEAT BLOC K34 is designed for direct connection to the boiler or via a distribution manifold, depending on the system layout.

Technical parameters

Material	Brass
Operating temperature	+110 °C
Total output up to	64 kW
Nominal pressure	PN 6
Code	39062M
Brand	IVAR

The operating temperature limit of 110°C ensures compatibility with standard heating circuits, while the maximum thermal output of 64 kW makes it suitable for medium-sized systems. The nominal pressure rating of PN 6 defines the hydraulic boundary conditions under which the module can operate safely. These parameters are crucial for determining whether the module meets the system’s flow and pressure requirements.

Installation and connection

The module includes inlet and return piping, a circulation pump, and a 3-way mixing valve with adjustable bypass functionality. Connection sizes and thread types should be verified against the system’s existing piping to ensure compatibility. Installers must also confirm that the control voltage (230 V) matches the available electrical supply and that the thermal insulation remains intact during installation. Key checkpoints during installation include verifying the correct orientation of the 3-way valve, ensuring that all threaded connections are sealed properly, and confirming that the bypass setting aligns with the system’s flow requirements. Common mistakes include incorrect bypass adjustment, which can lead to inefficient operation, and improper insulation of exposed components, potentially causing condensation or heat loss.

Compatibility and accessories

This boiler module is intended for use with IVAR heating systems and is compatible with standard distribution manifolds of type PAW.MV32. For complete system functionality, additional components such as a circulation pump (not included in this variant) and control system integration may be required. Accessories such as pressure gauges or expansion vessels should be selected based on the system’s specific requirements.

Technical background for designers

The 3-way mixing valve operates by diverting a portion of the return flow back into the supply line, thereby reducing the overall supply temperature to a safe level for the system components. The brass construction provides good corrosion resistance and mechanical strength, while the EPP thermal insulation minimizes heat loss and prevents surface condensation. The module integrates directly into the heating circuit and requires coordination with the boiler’s control system for optimal performance. System efficiency is influenced by the accuracy of the bypass setting and the hydraulic balance between the boiler and the rest of the system.

Service and operation

Routine checks should include verifying the integrity of the thermal insulation, inspecting the valve and pump for signs of wear, and ensuring that the bypass setting remains stable. While no specific service intervals are provided in the technical data, regular visual inspections are recommended to identify potential issues early. The presence of two built-in thermometers allows for real-time monitoring of supply and return temperatures, aiding in troubleshooting and system optimization.

Frequently asked questions

Can the bypass be adjusted during operation?
Yes, the bypass range of 0–50% allows for manual adjustment while the system is running, enabling fine-tuning of the supply temperature.

Is this module suitable for use with a condensing boiler?
It is compatible with condensing boilers provided that the system design accounts for the lower return temperatures typically associated with such systems.

What is the maximum flow rate supported by the module?
The module supports a flow rate up to 2760 l/h, as specified in the technical documentation.

Can the module be installed without a distribution manifold?
Yes, it can be connected directly to the heating system or via a distribution manifold, depending on the system configuration.