7
2.
For the Installer
2.2.3 Accumulator tank
The installation of a buffer tank is required by the following standards / laws:
– EN 303-5
– 1st Federal Immission Control Ordinance (Germany)
– Art. 15a of the Small Combustion Devices Agreement (Austria)
– Air Protection Ordinance (Switzerland)
Having a correctly sized accumulator tank is essential for correct operation of a wood-fired heating system. The
fuel must always be selected and the heat load of the building calculated. Heating characteristics (e.g. bringing
the hot water tank up to temperature in summer) and the system configuration (ground and/or radiator heating
circuits) should also be taken into consideration.
Information!
Rooms that are not heated at times (guest rooms, living areas only used at weekends, etc.) must be
subtracted from the calculated heat load (QH) for the accumulator tank configuration!
Recommended accumulator tank content
Wood gasification
Boiler model
Recommended accumulator tank content:
LogWIN Klassik
LWK 180 – 300
2000 l
Note!
Refer to planning documents for how to calculate the minimum buffer tank volume.
2.2.4 Heating circuits
Several heating circuits:
In-line regulating valves should be installed to permit better regulation of the system. In a building without insu-
lation (new building, not yet plastered) the calculated and actually required heating requirements often differ to a
considerable extent.
Minimum heat consumption:
The smallest possible boiler power must be continuously dissipated from the boiler during operation. Suitable
measures to ensure minimum heat consumption should be maintained throughout the entire burning time, e.g.:
– Correctly dimensioned buffer tank - see 2.2.3.
– Function of the MES plus–controller in the WVF+ function module on the master user module
incl. no thermostatic valves
– Non-blockable heating circuit, e.g. never fully close manual mixing valve, incl. no thermostatic valves
Note!
If operating with a manual mixing valve or the MES plus–function, elevated room temperatures may
sporadically occur.
Mixer valve:
A 3-way mixer valve is always necessary; in conjunction with outside temperature control, there must be a 3-way
motorised mixing valve and a buffer tank.
Underfloor heating:
Only possible with a buffer tank (with outside temperature control, motorised mixing valve).
