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(cannot be closed by anyone other than authorized persons).
The closed expansion tank is not included in the equipment supplied with the
boiler and the project and assembly units are responsible for the selection and
installation of the equipment.
Minimum Controllers Required in Systems with Closed Expansion
Tank
For safe and economic operation of closed expansion systems, the following
controllers must be available in the system.
Water temperature controller (Boiler thermostat);
There must be a controller which controls and regulates the water temperature
required by the heating system. This temperature cannot be above the
adjustable maximum setting temperature of the controller, boiler operating
temperature. For stan
dard CGS2 and CGS3 boilers max. 90°C. All optional
boiler control panels have a water temperature controller (Boiler thermostat). If
the optional control panel is not supplied, this controller must be supplied and
installed by the installer. The temperature control thermostat must comply with
EN 60730-2-9 and/or bear CE-marking.
Water temperature gauge (thermometer);
The boiler must be more than 20% of its maximum operating temperature. The
boiler must be installed in the flow line (the water temperature gauge in the
boiler return line is not required by the standards but is recommended by us).
All optional boiler control panels have a water temperature gauge (Boiler
thermometer). If the optional control panel is not supplied, water temperature
gauge must be supplied and installed by the installer.
Water pressure gauge (manometer);
A monometer must be connected to the boiler flow line to show 50% more
pressure than the operating pressure in the heating system. All optional boiler
control panels have a water temperature gauge (Boiler monameter 4 bar). If the
optional control panel is not supplied or when the system pressure is above 2.5
bar, water pressure gauge must be supplied and installed by the installer.
System water level and pressure regulation system;
A regulation to keep the heating system water level and pressure at operating
values must be installed in the system. According to the prEN 806-2: It is
sufficient to connect the boiler water filling line to the cold water network with 1
pressure reducer, 1 check valve,