Design Information | 3
M1820921_en | Installation instructions Dual fuel boiler SP Dual compact
17
Germany
The first BImSchV (Ordinance on small and medium-sized heating plants of 26 January
2010, BGBl. I P. 38) stipulates a minimum water heat storage tank volume of 55 litres per
kilowatt of rated heat output; a water heat storage tank with a volume of 12 litres per litre
of fuel loading chamber is recommended.
Switzerland
In accordance with the Swiss Federal Ordinance on Air Pollution Control (LRV 2018),
appendix 3, paragraph 523 “Special requirements for boilers”, hand-fed boilers up to 500
kW rated heat output must be fitted with a minimum heat storage tank volume of 12 litres
per litre of fuel loading chamber. The volume may not fall below 55 litres per kW rated
heat output.
3.9 Return lift
If the hot water return is below the minimum return temperature, some of the hot water
outfeed will be mixed in.
CAUTION
Risk of dropping below dew point/condensation formation if operated without return
temperature control.
Condensation water forms an aggressive condensate when combined with
combustion residue, leading to damage to the boiler.
Take the following precautions:
r
Regulations stipulate the use of a return temperature control.
Ä
The minimum return temperature is 60 °C. We recommend fitting some sort of
control device (e.g. thermometer).
3.10 Boiler ventilation
r
Fit the automatic ventilating valve at the highest point on the boiler or at the ventilation
connection (if present).
Ä
This ensures that air in the boiler is constantly expelled, thus preventing
malfunctions caused by air in the boiler
r
Check that the boiler ventilation is working properly
Ä
After installation and periodically according to manufacturer’s instructions
Tip:
r
Fit a vertical pipe as a calming section in front of the automatic ventilating valve in
such a way that the ventilating valve is positioned above the water level in the boiler
Recommendation:
r
Fit a microbubble separator in the pipes to the boiler
Ä
Follow the manufacturer's instructions!
