Applicable Standards:
ÖNORM / DIN EN 12828 Heating systems in buildings
The following prior standards still apply:
Austria: - Closed systems as per ÖNORM B 8131
- Open systems as per ÖNORM B 8130
Germany: - Closed systems as per DIN 4751 Part 2
- Open systems as per DIN 4751 Part 1
Combination with storage tank
NOTICE
It is not generally necessary to use a storage tank for the system to run
smoothly. However we recommend that you use it with a storage tank, as this
allows you to achieve continuous reduction within the ideal performance range
of the boiler.
For the correct dimensions of the storage tank and the line insulation (in
accordance with ÖNORM M 7510 or guideline UZ37) please consult your
installer or Fröling.
Return feed lift
If the hot water return feed is below the minimum return feed
temperature, some of the hot water outfeed will be mixed in.
CAUTION
Risk of dropping below dew point/condensation formation if operated
without return feed lift.
Condensation water forms an aggressive condensate when combined
with combustion residue, leading to damage to the boiler.
Regulations stipulate the use of a return feed lift.
The minimum return feed temperature is 55 °C. We recommend fitting
some kind of control device (e.g. thermometer).
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