oventrop Regumaq X-45 Operating Instructions Manual page 70

Special notes for corrosion protection
NOTICE
High media temperatures (>60 °C) increase the risk of corrosion
!
Do not set the hot water temperature and the flow temperature of the heating water higher than necessary.
NOTICE
Long stagnation periods increase the risk of corrosion
!
Flush the system manually or automatically on a regular basis if longer stagnation periods are to be expected
all the time (VDI/DVGW 6023).
•
Caution is always advised with the combination of hydrogen carbonate and chloride. Low hydrogen carbonate contents
combined with high chloride contents increase the risk of corrosion.
•
Caution is advised with the combination of hydrogen carbonate and sulphate. For copper brazed heat exchangers, the
hydrogen carbonate content in the water must not be lower than the sulphate content. If this is the case, a nickel
brazed, stainless steel brazed heat exchanger or a heat exchanger with protective layer must be used.
•
If the water constituents are not within the specified limits, a water treatment system must be installed if necessary.
NOTICE
An incorrectly operated water treatment system can increase the risk of corrosion!
•
In mixed installations, the "flow rule" must be observed when using copper brazed heat exchangers in conjunction
with galvanised steel pipes. You can find more information on this in the DIN EN 12502 standard.
•
Flush all supply pipes before mounting the station (DIN EN 806-4) to remove any dirt particles and residues from the
system.
•
When maintaining the station, take into account that cleaning agents can also promote corrosion of the heat
exchanger. In this context, observe the DVGW specifications, such as work sheets W291 and W319.
•
When using a copper brazed heat exchanger without protective layer, the electrical conductivity of the water may range
between 50 and 500 µS/cm. Take this into account, among other things, during water treatment in accordance with
VDI2035.
NOTICE
Corrosion and stone formation in the system
!
It is the responsibility of the system designer and system operator to take into account water constituents and
factors that influence the corrosion and stone formation of the system and to evaluate them for the specific
application. In critical water supply areas, coordination should therefore take place in advance with the local
water supply company.