Expansion vessel for domestic hot water CIMM ACS 05L, 5 L, 2.5/10 bar, -10–+100 °C

CIMM ACS 05L is a 5-litre expansion vessel intended for domestic hot water systems. The diaphragm-type design separates the water circuit from the precharged gas chamber to absorb thermal expansion and reduce pressure fluctuations. It is engineered for operating pressures from 2.5 to 10 bar and can be used in environments with temperatures between -10 °C and +100 °C. The compact cylinder fits typical residential installations, small boilers and hot water circulation loops where controlling pressure and protecting fittings and valves is required.

Advantages

The diaphragm construction provides reliable separation between the potable water and the gas charge, minimising the risk of contamination and loss of performance. A wide temperature range and rated working pressure make the vessel compatible with most domestic hot water systems. Its modest volume and standard fittings simplify installation in confined plant rooms or near service points while helping to stabilise system pressure during thermal cycling.

Suitable for

• Residential domestic hot water systems
• Small boilers and combi-boiler installations
• Hot water circulation loops and recirculation systems
• Pressure stabilisation and protection of fittings and valves

Key specifications

• Capacity: 5 litres
• Design: diaphragm-type expansion vessel
• Working pressure range: 2.5–10 bar
• Temperature range: -10 °C to +100 °C
• Application: domestic hot water (DHW) systems and small-scale hot water loops

How to use

Install the expansion vessel according to the system layout ensuring the connection matches the plant’s fitting size and orientation. Precharge the vessel to the system’s recommended static pressure and check the diaphragm integrity before commissioning. Position the vessel on a stable support or bracket and connect it to the return or feed line where it can absorb thermal expansion most effectively. After installation, perform a pressure test and adjust the precharge if necessary to achieve correct system operating pressure and expansion compensation.

Usage recommendations

For reliable performance, verify compatibility with potable water systems and use the vessel within the specified temperature and pressure limits. Periodically inspect the precharge pressure and diaphragm condition during maintenance intervals. If the system requires larger expansion capacity or operates above specified parameters, select a vessel with appropriate volume and rated pressure.