Expansion tank Cimm ERE CE 1500

Product detailed description

Expansion tanks are essential components in closed-loop heating systems, particularly in large residential complexes, commercial buildings, and industrial facilities where significant thermal expansion occurs. Installers working with central heating, solar thermal systems or hot water storage units encounter these devices when ensuring system stability and preventing overpressure. The Cimm ERE CE 1500 provides reliable compensation for thermal expansion in such applications.

When installing in multi-zone systems or hybrid systems with heat pumps or solar collectors, the tank must be sized correctly according to the system’s total water volume and expected temperature fluctuations. It is typically mounted vertically near the boiler or circulation pump, ensuring accessibility for inspection and maintenance. Proper orientation and secure mounting are essential to avoid mechanical stress on the piping connections.

Technical parameters

Height	2130 mm
Item number	821500
Name/volume	ERE CE 1500 L
Diameter	1000 mm
Connection thread	M 2 1/2 inch G
Operating pressure	2.5 bar
Maximum overpressure	8.0 bar
Operating temperature	-10+100 °C
Colour	Red
Code	821500
Brand	Cimm

The 1500 L nominal volume corresponds to the air chamber capacity, which determines how much thermal expansion can be absorbed without triggering the safety valve. The working pressure of 2.5 bar indicates the recommended pre-charge pressure when the system is cold. The maximum overpressure of 8.0 bar defines the upper limit before the safety device activates. These values influence the tank’s suitability for specific system configurations and pressure levels during normal operation.

Installation and connection

The M 2 1/2 inch G threaded connection requires appropriate pipe fittings and sealing materials. Before installation, verify the pre-charge pressure using a manometer and adjust it if necessary. The tank should be positioned vertically with the air valve at the top. Ensure that the inlet and outlet ports are aligned with the system piping to prevent misalignment stresses. Common mistakes include incorrect pre-charging, neglecting to isolate the tank during commissioning, or failing to secure the tank properly against vibration and lateral forces. Always check the integrity of the membrane inside the tank before connecting it to the system to avoid internal leakage and premature failure.

Compatibility and accessories

This model is compatible with most closed heating systems, including those with condensing boilers, heat pumps and solar thermal collectors. It requires a pressure gauge and safety valve to be connected upstream for monitoring and protection. A bleed valve may also be needed for system venting. No related products are listed for this model.

Technical background for designers

The tank operates based on the principle of separating water and compressed air within a flexible diaphragm. As the system heats up and expands, the water pushes into the tank, compressing the air cushion until the pressure returns to equilibrium. The tank body is constructed with a robust steel shell and a durable rubber membrane, ensuring long-term resistance to thermal cycling and chemical exposure from antifreeze agents or corrosion inhibitors. The tank integrates directly into the return line or primary circuit, depending on the system design. For optimal performance, the tank must be sized in relation to the system’s total water volume and the difference between minimum and maximum operating temperatures. Regular monitoring of the pre-charge pressure and membrane condition ensures continued efficiency and prevents system instability.

Service and operation

Periodic checks of the pre-charge pressure and membrane integrity are essential. If the pressure drops below the specified level, it must be adjusted using an air compressor and manometer. No scheduled service intervals are provided in the brief, but visual inspections and pressure tests should be performed during annual system maintenance. Replace the tank if the membrane fails or the pressure cannot be maintained.

Frequently asked questions

Can the Cimm ERE CE 1500 be connected to a solar thermal system?
Yes, provided the system is closed and the thermal expansion is calculated according to standard sizing methods. Ensure the tank is located near the collector array or heat exchanger.

Is the tank suitable for use with glycol-based antifreeze solutions?
Yes, as long as the membrane is compatible with the fluid. Check the manufacturer’s technical documentation for confirmation.

How is the pre-charge pressure set?
The pre-charge pressure is adjusted using a manometer and air compressor. Set it to match the system’s cold pressure before initial commissioning.

Can multiple tanks be connected in parallel for larger systems?
Yes, but ensure all tanks have identical pre-charge pressures and are installed in accordance with the system layout and flow dynamics.

Documents for download

• Dokument na stiahnutie (PDF)
• Dokument na stiahnutie (PDF)
• Dokument na stiahnutie (PDF)