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6.2
Expansion vessel
The central heating system must be provided with an expansion vessel. The expansion
vessel which is used should be geared to the water content of the installation. The precharge pressure depends on the installation height above the mounted expansion vessel.
See table 4.
installation height above
the expansion vessel
pre-charge pressure
of the expansion vessel
5m
0,5 bar
10 m
1,0 bar
15 m
1,5 bar
choice of expansion vessel
table 4
All Combi boilers are provided with an expansion vessel connection. This pipe is
connected with the three way valve and boiler pump. This prevent the expanding water,
during hot water production, is being closed off from the expansion vessel, when the
thermostatic radiator valves are fully closed. A second expansion vessel in the installation
is not a problem.
In connection with correct functioning of the boiler it is necessary for the
expansion vessel to be connected to the expansion vessel pipe of the boiler.
Installation Instructions Strebel Q-boiler range
The Solo boilers are not provided with an expansion vessel connection. When one of
these Solo boilers is combined with a cylinder then one has to take into account that the
expansion vessel should be connected between the three-way valve and the boiler
circulation pump.
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