Installation & Servicing Instructions ATAG Q-Series
12
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
pre-charge pressure depends on the installation height above the mounted expansion
vessel. See 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.
The Solo boilers Q15S, Q25S and Q38S are provided with an expansion vessel
connection. When this boiler is combined with a cylinder, the expansion vessel
connection is included in the internal piping of the cylinder circuit, to which the
expansion vessel can be connected.
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.
The Solo boilers Q51S and Q60S 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.
choice of expansion vessel table 4
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