Installation & Servicing instructions
AT
AG XL
17
Required components that are not supplied by ATAG:
- The installation pump;
- The condensate discharge system.
- The installation water filter;
- Air and dirt separator
- Gas filter;
- Hot water supply
- Regulation valve;
- Flue system
- Expansion vessel(s);
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 in-
stalled 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.
Expansion DHW cylinder circuit
When applying a DHW cylinder connected directly to the boiler (ATAG cylinder connec-
tion with use of 3-way valve) the circuit between the three-way valve and the separation
of the DHW cylinder should be provided of an expansion tank.
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
ATAG. Always contact ATAG 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 1, you can
start flushing the installation before installing the boiler(s).
- 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. ATAG 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.
