3 | Design Information
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M2250322_en | Installation instructions Wood chip boiler T4e 200-350
3.8 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.
3.9 Return temperature control
As long as the hot water return is below the minimum return temperature, part of the hot
water flow is added. This function is assumed by the function which increases the
temperature inside the boiler.
3.10 Boiler ventilation
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Fit the automatic ventilating valve at the highest point on the boiler or at the ventilation
connection (if present).
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This ensures that air in the boiler is constantly expelled, thus preventing
malfunctions caused by air in the boiler
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Check that the boiler ventilation is working properly
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After installation and periodically according to manufacturer’s instructions
Tip:
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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:
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Fit a microbubble separator in the pipes to the boiler
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Follow the manufacturer's instructions!
