Planning guide for expansion vessels
Sizing of membrane pressure expansion vessels
A requirement for the trouble-free functioning of the heating system or a solar heating system is the correct dimensioning of the size and the correct setting of the inlet pressure of the expansion vessel. The pre-pressure of the expansion vessel as delivered must not be used without checking, but must be adjusted carefully for the respective system.
The pre-pressure of the expansion vessel has always to be checked and adjusted in the pressureless operating state of the heating system!
With the below calculation example you can determine the size and the pre-pressure of the expansion vessel.