16
The boiler is not suitable for installations that are equiped with “open” expansion tanks.
Additives in the installation water are only permitted in consultation with the country distributor. See
chapter 9.3 for detailed information.
9.2 Expansion vessel
The iC boilers are featured with a built-in expansion vessel with a capacity of 8 litres and a pre-pressure
charge 1 bar. If the expansion vessel size is insucient for the CH system, an additional expansion must be
installed. The additional expansion vessel should, together with the built-in expansion vessel, be sized to the
water content of the installation. The pre-pressure charge depends on the height of the installation above the
installed expansion vessel. See Table 9.2.a.
The (additional) expansion vessel should be connected as closely as possible in the return pipe near
the boiler.
Installation height above the expansion vessel pre-charge pressure of the expansion vessel
5m 0.5 bar
10m 1.0 bar
15m 1.5 bar
table 9.2.a
The pressure relief valve outlet is combined with the condensate outlet (see gure 9.9.e on page 31).
9.3 Water quality
Fill the installation with mains cold water.
In most cases, a heating system can be lled 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 lling water has to meet the
specications mentioned in table 9.3.a:
If the lling water does not meet the required specications, you are advised to treat the water to such an
extent that it does meet the required specications.
contact ATAG Heating Technology Ltd 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 nd an
explanation of these denitions)
- If the mains water quality meets the specications mentioned in table 9.3.a, you can start ushing the
installation before installing the device.
- Whilst ushing, corrosion products (magnetite), tting products, cutting oil and other undesirable products
have to be removed.
- Another possibility is to remove the pollution by installing a lter. The lter type has to t the type and
grain size of the pollution. ATAG Heating Technology Ltd recommends lter 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 purpose, 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 lling water in
accordance with the period laid down by the additives supplier.
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