Expansion vessel
The iC & iS boilers are featured with a built-in expansion vessel with a capacity of 8 litres
and a pre-pressure charge 1 bar. Where the system volume is more than 100 litres or
exceeds 2.65 bar at maximum heating temperature, then the expansion vessel size is
insucient for the CH system, an additional expansion must be installed. The additional
expansion vessel must be installed as close as possible to the appliance in the central
heating return. The additional expansion vessel should, together with the built-in
expansion vessel, be sized to the water content of the installation. The pre-pressure
charge depends on the height of the installation above the installed expansion vessel.
Pressurise the extra expansion vessel to the same figure as the expansion vessel built
into the appliance.
Appliance
expansion
vessel
Extra
expansion
vessel
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