Boiler assembly - non-mixed - DN 32; without pump IVAR.KS 550

Product detailed description

Non-mixed boiler assemblies are commonly used in heating systems where the return flow is not mixed with the supply flow. This configuration is typical in systems with high thermal demand and where precise temperature control is not required. Installers working on commercial or large residential buildings often use such assemblies to ensure stable and efficient heat distribution. The DN 32 size is suitable for medium to large boilers, where the flow rate and pressure requirements are higher than standard domestic systems. The assembly is designed for integration into systems with a nominal pressure of PN 10 and a maximum operating temperature of 120°C, making it suitable for a wide range of heating applications.

During installation, the assembly is typically connected to the boiler’s primary circuit and integrated into the overall heating system. The components included in the assembly are selected to ensure reliable operation and ease of maintenance. The brass construction provides good corrosion resistance and mechanical strength, while the thermal insulation minimises heat loss and ensures safe handling of hot components. The internal and external threading (5/4“ F × 5/4” M) ensures compatibility with standard piping systems and fittings.

Technical parameters

Material	Brass CW617N
Operating temperature	+120 °C
Maximum flow rate	3000 l/h
Nominal pressure	PN 10
Code	550610B
Brand	IVAR

The operating temperature of +120°C and PN 10 rating are key factors in determining the suitability of this assembly for a given system. The maximum flow rate of 3000 l/h indicates the capacity of the assembly to handle high-volume flow applications. These parameters are essential for correct sizing and selection, ensuring that the assembly can meet the system’s hydraulic and thermal demands without exceeding its operational limits.

Installation and connection

The installation process begins with verifying the alignment of the assembly with the boiler’s primary circuit. The internal and external threading (5/4“ F × 5/4” M) must be matched with the corresponding piping components. The assembly includes a horizontal distribution manifold, supply and return piping, a circulation pump, two thermometers, a ball valve, two filling/drain valves, a manual air vent, a check valve, and thermal insulation. During installation, it is important to ensure that all connections are properly sealed and that the pump is correctly aligned with the flow direction. Common installation mistakes include incorrect orientation of the pump, improper sealing of threaded connections, and failure to bleed the system after installation. A pressure test should be conducted to confirm the integrity of the system before commissioning.

Compatibility and accessories

This boiler assembly is compatible with a range of heating systems that use non-mixed return circuits. It is designed to integrate with standard boiler systems and can be used in conjunction with additional components such as expansion vessels, pressure relief valves, and control systems. Accessories that may need to be ordered separately include mounting brackets, insulation materials, and control panels. Installers should ensure that all components are compatible with the system’s operating parameters and that the assembly is correctly integrated into the overall circuit.

Technical background for designers

The non-mixed boiler assembly operates by allowing the return flow to pass through the system without being mixed with the supply flow. This design is suitable for systems where the return temperature is not critical and where high flow rates are required. The brass CW617N material provides good mechanical strength and resistance to corrosion, making it suitable for use in heating systems with high thermal loads. The thermal insulation reduces heat loss and ensures that the assembly remains safe to handle. The efficiency of the system depends on the correct sizing of the flow rate and the pressure rating, as well as the proper integration of the circulation pump and control components.

Service and operation

Regular maintenance of the boiler assembly includes checking the integrity of all connections, inspecting the circulation pump for signs of wear, and ensuring that the thermal insulation remains intact. The manual air vent should be checked periodically to ensure that it is functioning correctly. The ball valve and check valve should also be inspected for leaks or blockages. No specific service intervals are provided in the brief, but it is recommended to perform routine checks in accordance with the manufacturer’s guidelines.

Frequently asked questions

Can this boiler assembly be used in systems with a higher operating temperature than 120°C?
No, the maximum operating temperature is specified as +120°C, and exceeding this may compromise the integrity of the assembly.

Is the circulation pump included in the assembly?
Yes, the assembly includes an integrated circulation pump as part of the standard configuration.

What type of valves are included in the assembly?
The assembly includes a ball valve, two filling/drain valves, a manual air vent, and a check valve.

Can this assembly be used in a mixed return system?
No, this is a non-mixed boiler assembly and is not designed for use in mixed return systems.