Notes for operating a heating system | 3
B1300122_en | Operating instructions Lambdamat LM 800-1000
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3.6 Return lift
If the hot water return temperature is below the minimum return temperature, some of the
hot water outfeed will be mixed in.
NOTICE
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:
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Regulations stipulate the use of a return temperature control.
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The minimum return temperature is 60 °C. We recommend fitting some kind of
control device (e.g. thermometer).
3.7 Storage tank
NOTICE
In principle it is not necessary to use a storage tank for the system to run smoothly.
However we recommend that you use the system with a storage tank, as this ensures a
continuous supply of fuel in the ideal output 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.
Additional requirements for Switzerland in accordance with LRV Appendix 3, section 523
Automatic boilers with a rated thermal output ≤ 500 kW must be equipped with a heat
accumulator of a volume of at least 25 litres per kW rated thermal output.
3.8 Chimney connection/chimney system
EN 303-5 specifies that the entire flue gas system must be designed to prevent, wherever
possible, damage caused by seepage, insufficient feed pressure and condensation.
Please note in this respect that flue gas temperatures lower than 160K above room
temperature can occur in the permitted operating range of the boiler.
NOTICE! Please see the technical data contained in the assembly instructions for
further information about standards and regulations as well as the flue gas
temperatures when clean and the other flue gas values!
