26
Installation
Water and hydraulic system
Heating water quality
Fill the installation with
drinking water.
In most cases, a central heating
installation can be filled with water
according to the nationally valid
regulations, whereby a treatment of the
water is not necessary.
To avoid problems, the quality of
the filling water must meet the
requirements in Table 1.
If the filling water should not meet
these requirements, then it is
recommended to treat the water
correspondingly (see VDI2035).
Warranty claims become invalid if the
system has not been flushed during
installation, or if the filling water quality
does not meet the ATAG requirements
(see Table 1).
If anything should not be clear, or in
case of deviations, always get in touch
with ATAG first. The warranties lapse, if
any changes are made without an prior
agreement/release by ATAG.
Installation:
- The use of groundwater,
demineralized water and distilled
water, is not permitted (an
explanation of these terms can be
found on the next page).
- If the drinking water quality lies
within the limits of the values in
Table 1, then one can proceed
with the installation of the
system and the flushing of the
equipment.
- Residues of corrosion products
(magnetite), assembly materials,
cutting oil and other undesirable
products, must be removed during
the flushing operation.
- Another possibility for removing
dirt is the use of a filter. The filter
type must meet the system-specific
requirements and the type of
contamination. ATAG recommends
the use of a filter.
In such a case, one should make
sure to take the entire system into
consideration.
- The central heating installation must
be de-aerated properly, before it is
taken into operation. Please check
the Chapter “Commissioning”
in this regard.
- If a regular topping up of water
is required (> 5% per year), then
there is a problem with the system
that must be rectified by a certified
technician. Regular topping up
with fresh water adds oxygen and
lime to the system, which leads
to deposits.
- If an anti-freeze agent or other
additives are used, then it must be
regularly checked to ensure that the
filling water quality meet the ATAG
requirements.
- Inhibitors may only be used after
consultation with ATAG.
- The use of such agents must be
protocolled.
Floor heating
When a floor heating system is
connected that uses plastic pipes,
it must be ensured that it meet the
standard DIN 4726-4729. If the system
does not fulfil the standard, then a
system separation must be used.
If the regulations with regard to
plastic piping are not met, then
warranty claims become null and
void (see the warranty conditions).
Parameters
Value
Water type
Drinking water
Softened water
pH
6.0-8.5
Conductivity (at 20°C in µS/cm)
Max. 2500
Iron (ppm)
Max. 0.2
Hardness (°dH / °fH)
Installation volume/performance
<20 l/kW
1-12 °dH / 1-21.5 °fH
Installation volume/performance
>=20 l/kW
1-7 °dH / 1-12.5 °fH
Oxygen
Oxygen diffusion is not permitted during operations.
Max. 5% of the system volumes may be topped up annually.
Corrosion inhibitors
See the Chapter "System water additives (inhibitors)"
pH raising or lowering agents
See the Chapter "System water additives"
Anti-frost additives
See the Chapter "System water additives"
Other chemical additives
See the Chapter "System water additives"
Solid substances
Not permitted
Residues in the heating water, which are not a component of
the drinking water are
Not permitted
Table 1
