Expansion vessel for Domestic Hot Water IBAIONDO 18L

Product detailed description

Expansion vessels for domestic hot water are essential components in systems where thermal expansion must be accommodated without overpressure. These vessels are commonly used in DHW storage tanks, combination boilers, and systems where potable water is heated. Installers working in residential and commercial buildings must ensure correct sizing and integration to maintain system efficiency and safety. The vessel's design must account for fluctuating temperatures and pressures, which are typical in DHW systems.

Proper installation of an expansion vessel involves assessing the system's thermal expansion volume and ensuring the vessel's pre-charge pressure matches the system's operating conditions. The vessel must be mounted in a location that allows for easy access for maintenance and inspection. It is also important to verify that the vessel is compatible with the system's materials and operating parameters to avoid premature failure or inefficiency.

Technical parameters

Type	Expansion vessel for domestic hot water
Volume	18 l
Max. working pressure	10 bar
Pre-charge pressure	3 bar
Operating temperature	-10°C to +100°C
Membrane	Fixed EPDM
Material	Steel with powder coating, wall thickness 1 mm
Color	White
Connection	3/4 inch
Net weight	3.120 kg
Warranty	2 years
EAN	5900308748756
Code	NP.CWU.18.IB
Brand	Hydroland

The 18L capacity is suitable for systems with moderate thermal expansion requirements. The maximum working pressure of 10 bar ensures compatibility with standard DHW systems, while the pre-charge pressure of 3 bar must be adjusted to match the system's cold pressure. The operating temperature range from -10°C to +100°C allows the vessel to function in environments with significant temperature variations. The EPDM membrane provides resistance to both high temperatures and chemical exposure, making it suitable for potable water applications.

Installation and connection

The vessel is connected using a 3/4 inch thread, which is standard for many DHW systems. Installers should ensure the connection is clean and free from debris before tightening the fittings. The pre-charge pressure must be verified using a pressure gauge and adjusted if necessary. A common mistake is failing to account for the system's cold pressure when setting the pre-charge, which can lead to improper operation. The vessel should be mounted vertically with the pressure relief valve accessible for inspection and maintenance. It is also important to ensure the vessel is not subject to mechanical stress from adjacent components.

Compatibility and accessories

This expansion vessel is designed for integration with DHW storage tanks and combination boilers. It is compatible with systems that operate within the specified pressure and temperature ranges. The pressure relief valve is included in the package, eliminating the need for additional components. Installers should verify that the system's piping and fittings are compatible with the 3/4 inch connection. No additional accessories are required for standard installations, but it is recommended to have a pressure gauge on hand for initial setup and periodic checks.

Technical background for designers

The operating principle of the expansion vessel relies on the separation of water and compressed air by a fixed EPDM membrane. As the water in the system heats and expands, the membrane compresses the air in the vessel, preventing overpressure. The membrane's EPDM material is resistant to both high temperatures and chemical exposure, making it suitable for potable water applications. The vessel's steel construction with a powder-coated finish provides durability and resistance to corrosion. The 1 mm wall thickness ensures structural integrity under the specified operating conditions. Proper integration into the system requires consideration of the vessel's location and orientation to ensure optimal performance and accessibility for maintenance.

Service and operation

Periodic checks of the pre-charge pressure are recommended to ensure the vessel continues to function correctly. If the pressure drops below the system's cold pressure, the vessel may not provide adequate expansion capacity. The pressure relief valve should be inspected for signs of wear or blockage. No specific service intervals are provided, but it is advisable to check the vessel during routine system maintenance. If the membrane is damaged or the vessel shows signs of corrosion, it should be replaced immediately to prevent system failure.

Frequently asked questions

Can the expansion vessel be connected to a DHW storage tank?
Yes, the vessel is specifically designed for use with DHW storage tanks and combination boilers. It must be connected to the system at a point where thermal expansion is expected.

Is the pressure relief valve included in the package?
Yes, the pressure relief valve is included and is part of the standard package. No additional components are required for installation.

Can the vessel be used in systems with higher operating pressures?
No, the maximum working pressure is 10 bar. Using the vessel in systems with higher pressures may result in damage or failure.

What is the recommended pre-charge pressure for the vessel?
The pre-charge pressure is set to 3 bar. This value should be adjusted to match the system's cold pressure for optimal performance.