22
Heating systems with rated operating temperatures up to 100 ºC
(VDI 2035)
Prevent excessive scale build-up
(calcium carbonate) on the heating
surfaces. For heating systems with
operating temperatures up to 100 °C, the
VDI Directive 2035 sheet 1 "Prevention
of heating system damage in hot water
heating systems - scaling in DHW and
hot water heating systems" applies [in
Germany; check local regulations]:
At an output in excess of 600 kW, the
total of alkaline earths in the fill and top-
up water must not exceed 0.02 mol/m³.
Operating information:
■ Take the system into use step by step,
starting with the lowest boiler output
and at a high heating water flow rate.
This prevents a localised
concentration of lime deposits on the
boiler heating surfaces.
■ During expansion or repair work, only
drain the necessary pipework
sections.
■ Filters, dirt traps and other blow-down
or separating facilities in the heating
water circuit must be checked,
cleaned and activated more frequently
after commissioning or new
installations, and later on subject to the
water treatment applied (e.g. water
softening).
The build-up of lime deposits on the
heating surfaces will be minimised if
these instructions are observed.
Any scale deposits that have formed
because the requirements to VDI
Directive 2035 have not been observed,
will in most cases already have caused
a reduction in the service life of the
installed heating equipment. Removing
the lime deposits is one option to restore
the operational viability.
This measure must be carried out by a
specialist. Inspect the heating system for
possible damage prior to returning it into
use. It is essential that the faulty
operating parameters are corrected to
prevent renewed formation of excessive
scale deposits.
Water quality requirements
Water quality requirements
5692 798
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