Viessmann VITOCROSSAL 300 Service Instructions Manual page 26

Water quality requirements
(cont.)
Where chemicals are used as part of the
corrosion protection, we recommend
that the manufacturer of the chemicals
issues a certificate of suitability of the
additives with regard to the boiler mate-
rials and the materials of the other heat-
ing system components. We recom-
mend you refer questions regarding
water treatment to an appropriate spe-
cialist.
Further details can be found in VDI
Directive 2035-2 and EN 14868.
26