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Required components that are not supplied by A.O.Smith:
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The installation pump;
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The installation water filter;
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Gas filter;
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Regulation valve;
6.2 Expansion vessel
The CH-installation has to be fitted with an expansion vessel. The expansion vessel used
has to comply with the water contents of the installation.
It is not necessary to install an expansion vessel to each boiler. One single, central instal-
led expansion vessel is sufficient. When using a single expansion vessel the handles of
the valves on the flow and return pipes below the boiler have to be removed whilst open.
A boiler expansion vessel can be connected on the cross union inside the return pipe
to each boiler, if required. The connection is fitted with a 3/4" outer thread blanking cap.
6.3 Water quality
Fill the installation with drinking water.
In most cases, a heating system can be filled with water according to national standards
for water and treatment of this water is 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:
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The use of groundwater, demi-water and distilled water is prohibited. (on the next
page you will find an explanation of these definitions)
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If the drinking water quality meets the specifications mentioned in table 6.3.a, you
can start flushing the installation before installing the boiler(s).
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Whilst flushing, corrosion products (magnetite), fitting products, cutting oil and other
undesirable products have to be removed.
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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.
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In this case, the whole piping system should be taken into consideration.
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The CH-installation has to be properly vented before using the system. For that pur-
pose, we refer to the commissioning chapter.
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If a regular water top up is required (>5% on an annual basis), then there is a struc-
tural problem and an installer has to solve the problem. Adding regularly 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.
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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.
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Chemical additions are to be avoided and should only be used after A.O.Smith has
approved their corresponding use.
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Should you wish to achieve the required water quality by using chemical additives, then
this is your own responsibility. The warranty on the product delivered by A.O.Smith
expires, if the water quality does not meet A.O.Smith´s specifications or the chemical
additives have not been approved by A.O.Smith.
- The condensate discharge system.
- Air and dirt separator
- Hot water supply
17
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