Expansion Tank Cimm SOLAR 50 L

Product detailed description

Solar thermal systems require expansion tanks to manage the volume changes caused by temperature fluctuations in the heat transfer fluid. These tanks help maintain stable pressure and prevent damage to components such as pumps, collectors and valves. In residential and commercial buildings, the Cimm SOLAR 50 L is typically installed in systems with medium storage capacity, ensuring efficient operation over the long term.

Installers working on rooftop or ground-mounted solar systems will find this tank suitable for both new installations and system retrofits. Its cylindrical shape and compact dimensions make it adaptable for mounting in mechanical rooms, utility areas or near the collector array. The red-coloured tank provides visual identification and can be integrated with standard piping layouts using standard thread connections.

Technical parameters

Height	565 mm
Article number	400050
Name/volume	SOLAR 50 L
Diameter	380 mm
Connection thread	M 3/4 inch G
Operating pressure	2.5 bar
Maximum overpressure	10.0 bar
Operating temperature	-10+100 °C
Color	red
EAN	8033003530177
Code	400050
Brand	Cimm

The 50 L nominal volume ensures sufficient space for thermal expansion in systems with moderate flow rates. The maximum pressure rating of 10 bar allows safe operation even under peak conditions. The working temperature range from -10°C to +100°C supports seasonal variations and ensures reliable performance in diverse climates.

Installation and connection

To connect the Cimm SOLAR 50 L, locate the tank in a position that allows access for inspection and prevents freezing. The M 3/4 inch G inlet should be aligned with the system's expansion line, using a compatible pipe fitting. Ensure the tank is mounted vertically with the connection at the top to allow proper fluid movement. Before securing the tank, verify the system pressure settings and ensure the pressure relief valve is correctly sized. Common errors include incorrect orientation, failure to isolate the tank during commissioning, or neglecting to bleed air from the system after installation. Always follow the manufacturer’s guidelines for torque specifications when tightening threaded connections.

Compatibility and accessories

The Cimm SOLAR 50 L is compatible with most solar thermal systems using glycol-based or water-based heat transfer fluids. For optimal system function, it should be used with a pressure relief valve, a differential pressure sensor and a properly sized circulation pump. Additional components such as isolation valves and expansion pipe fittings may also be required depending on the system layout.

Technical background for designers

This expansion tank operates based on the principle of hydraulic separation between the heat transfer fluid and the compressed air or gas charge inside the tank. The internal diaphragm separates the two media, allowing the tank to absorb thermal expansion without losing pressure. Constructed from durable materials, it is resistant to corrosion and thermal cycling. The tank integrates seamlessly into closed-loop solar systems, helping to stabilise pressure and reduce stress on components. Long-term efficiency depends on correct sizing, regular pressure checks and avoidance of overfilling. Proper insulation of the tank and associated piping further enhances performance in cold environments.

Service and operation

During routine maintenance, check the tank’s internal pressure using a manometer and compare it with the system pressure. If the pressure is significantly lower than expected, it may indicate a leak or loss of gas charge. Visually inspect the tank for signs of corrosion or physical damage. No scheduled service intervals are specified; however, periodic checks are recommended following major system modifications or after periods of non-use.

Frequently asked questions

Can the Cimm SOLAR 50 L be used with antifreeze solutions?
Yes, the tank is suitable for systems using glycol-based antifreeze mixtures within the specified temperature range.

Is vertical installation mandatory?
Yes, the tank must be mounted vertically to ensure correct operation of the internal diaphragm and pressure equalisation.

What is the maximum allowable pressure for continuous operation?
The working pressure limit is 2.5 bar. Operation beyond this level could affect the tank’s integrity.

Can this tank be used in combination with a traditional boiler?
It is specifically designed for solar thermal applications and may not be suitable for direct connection to a boiler unless the system design accounts for differing pressure characteristics.

Documents for download

• Documentation for downloading (PDF)
• Documentation for downloading (PDF)
• Documentation for downloading (PDF)