Automatic air separator - for solar systems - 3/4" IVAR.DISCAL SOLAR 251

Product detailed description

Automatic air separators are essential components in closed-loop solar thermal systems where air accumulation can reduce efficiency and cause operational issues. Installers working on residential or commercial solar installations often encounter air pockets in the system, especially after commissioning or maintenance. These separators are typically installed in the primary circuit of solar collectors, near the pump or expansion vessel, to ensure continuous and efficient heat transfer. The compact design allows for installation in tight spaces, such as under floor slabs or in technical rooms, without requiring frequent manual intervention.

Correct selection and installation of an air separator are critical to system performance. The unit must be sized to handle the expected air load and installed in a location that allows for easy access for inspection and maintenance. The operating conditions, including temperature and pressure, must also be considered to ensure long-term reliability and prevent premature failure.

Technical parameters

Material	Brass CW617N
Operating temperature	+110 °C
Nominal pressure	PN 10
Code	251003
Brand	IVAR

The operating temperature limit of +110°C makes this model suitable for solar thermal systems where heat transfer fluids can reach elevated temperatures. The PN 10 pressure rating ensures compatibility with standard domestic and commercial solar system piping. The brass CW617N body provides good corrosion resistance and mechanical strength, while the stainless steel internal components ensure durability in contact with water and antifreeze solutions.Installation and connection The air separator is connected via a 3/4 inch thread, typically using a male or female thread depending on the system configuration. Installers should ensure that the connection is fully tightened and sealed with a suitable sealing compound or tape to prevent leaks. The unit should be installed in a vertical position, with the air venting direction upwards, to allow for efficient air removal. A common mistake is incorrect orientation, which can prevent air from being effectively vented. It is also important to ensure that the separator is not installed in a location where it could be subject to freezing or excessive vibration.Compatibility and accessories This air separator is compatible with standard solar thermal systems using glycol-based or water-based heat transfer fluids. It is typically used in conjunction with circulators, expansion vessels, and temperature sensors. No additional accessories are required for standard installation, but it is recommended to check the system's technical documentation for specific requirements. Related products include other IVAR air separators and control valves suitable for solar applications.Technical background for designers The automatic air separator operates by allowing air to rise to the top of the chamber, where it is vented through a controlled orifice. The design ensures that only air is released, preventing the loss of heat transfer fluid. The brass CW617N body is chosen for its resistance to corrosion and mechanical stress, while the stainless steel components ensure compatibility with a wide range of fluids. The unit is integrated into the system via a threaded connection and is designed to operate without manual intervention. The service life is influenced by the quality of the installation, the operating conditions, and the presence of contaminants in the system fluid.Service and operation The unit requires no regular maintenance under normal operating conditions. However, it is recommended to inspect the connection for leaks and to check the venting function during routine system checks. No service intervals are specified in the technical documentation, but any signs of blockage or reduced performance should be investigated by a qualified technician. The unit should be replaced if it shows signs of internal corrosion or mechanical failure.Frequently asked questions

Can the IVAR 551 be used in a closed-loop solar system with glycol?
Yes, the separator is suitable for use with glycol-based heat transfer fluids, provided the system is within the specified operating temperature and pressure limits.

Is the unit suitable for installation in a horizontal position?
No, the unit must be installed vertically with the air venting direction upwards to ensure proper air removal.

Can the separator be used in a domestic hot water system?
It is not recommended for use in domestic hot water systems unless specifically designed for that application. This model is intended for solar thermal circuits only.

What is the maximum allowable operating temperature for this model?
The maximum operating temperature is +110°C, as specified in the technical data.