Expansion Vessel; Water Quality - A.O. Smith Epsilon EB-40 Installation And Service Manual

6.2 Expansion vessel

6.3 Water quality

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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 6.2.a.
installation height above
the expansion vessel
5 m
10 m
15 m
choice of expansion vessel
The Solo boilers EB 40 and EB 50 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.
Fill the installation with drinking water.
In most cases, a heating system can be filled with water according to national standards
for water and is treatment of this water not necessary.
In order to avoid problems with the CH-installations, the quality of the filling water has to
meet the specifications mentioned in table 6.3.a:
If the filling water does not meet the required specifications, you are advised to treat the
water to such an extent that it does meet the required specifications.
The warranty becomes invalid, if the installation is not being flushed and/or the
quality of the filling water does not meet the specifications recommended by
A.O. Smith. Always contact A.O. Smith in advance, if things are not clear or you
wish to discuss any deviations. Without approval, the warranty becomes invalid.
Installation:
- The use of groundwater, demi-water and distilled water is prohibited. (on the next
page you will find an explanation of these definitions)
- If the drinking water quality meets the specifications mentioned in table 6.3.a, you
can start flushing the installation before installing the device.
- Whilst flushing, corrosion products (magnetite), fitting products, cutting oil and other
undesirable products have to be removed.
- Another possibility is to remove the pollution by installing a filter. The filter type has
to fit the type and grain size of the pollution. A.O. Smith recommends filter usage.
- In this case, the whole piping system should be taken into consideration.
- The CH-installation has to be properly vented before using the system. For that pur-
pose, we refer to the commissioning chapter.
- If a regular water top up is required (>5% on an annual basis), then there is a structural
problem and an installer has to solve the problem. Regularly adding fresh water to the
system also adds additional calcium and oxygen implying that magnetite and calcium
residues can continue. The result may be blockages and/or leakages.
- The use of anti-freeze and other additives requires periodical quality checks of the
filling water in accordance with the period laid down by the additives supplier.
- Chemical additions are to be avoided and should only be used after A.O. Smith has
approved their corresponding use.
pre-charge pressure
of the expansion vessel
0,5 bar
1,0 bar
1,5 bar
table 6.2.a