Table of Contents
Advertisement
Standard values for water quality
Protecting the heating water from oxygen ingress
■
Prevent continuous oxygen ingress and the entry of
airborne oxygen into the system during operation.
■
Apply technical rules, specifically VDI Guideline
2035-2.
Ensure that the heating system is designed correctly
■
(dimensions, system pressure).
Operate the heating system in line with regulations.
■
■
Equip sealed unvented systems with a diaphragm
expansion vessel, for example.
Recommendation for diaphragm expansion vessel
Check the pre-charge pressure during the annual serv-
ice at the latest.
Pressure maintaining systems and corrosion
"General engineering information" chapter in the
technical guide
Operate the system with positive pressure
In the entire boiler system
■
■
On the pump suction side
■
In every system operating state
(cont.)
Additional protection against oxygen ingress
■
Add an oxygen binder (excess of 5 - 10 mg
Na
SO
/l).
2
3
■
Adjust the pH value of the heating water to 8.2 - 9.5.
Use of aluminium components
Bear in mind that different conditions may apply.
Corrosion protection with chemicals:
Obtain a safety declaration from the chemical manu-
facturer regarding the interaction of the chemicals with
the materials used in the steam boiler, the hot water
boiler and the other components of the heating sys-
tem.
Recommendation
Consult the relevant contractor regarding water treat-
ment.
Detailed information
VDI Guideline 2035-2 and EN 14868
Water quality
11
Advertisement
Table of Contents
