Room air-independent appliance
The pellet boiler is suitable for room air-independent operation up to a maximum
permissible room-side under-pressure of 8 Pa. Provided the permissible room-side
under-pressure limit is not exceeded, there are no restrictions regarding simultaneous
operation of air-drawing systems (e.g with a room ventilation system). If the under-
pressure in the installation room is higher than the permissible under-pressure limit,
the appliance is classified as room air-dependent and must be equipped with a safety
systems (under-pressure monitoring system).
In Germany, the following additional requirement must be observed: Only use DIBt-
certified components for supply air lines and the flue gas system. Flexible aluminium
pipes must be protected against mechanical loads.
Room air-dependent appliance
In the case of room air-dependent appliances, some restrictions apply regarding
simultaneous operation of air-drawing systems (e.g. with a room ventilation system,
etc.). Safety equipment is required in these cases.
As a basic rule:
▪ When operating air-drawing systems (e.g. room ventilation, etc.) simultaneously
with a room air-dependent appliance, the room-side under-pressure must not
exceed 4 Pa.
In addition, at least one of the following three requirements must be met:
(Source: Section 4 MFeuV 2007 / 2010)
▪ Use safety equipment that prevents simultaneous operation of appliance and other
air-drawing systems
OR
▪ Monitor the extraction of the flue gas using special safety equipment
OR
▪ Make sure that the outside air lines required for the appliance are isolated from the
outside air lines required for the ventilation system. This ensures that no
dangerous under-pressure can develop while operating the appliance.
Simultaneous operation
A safety system must ensure that no dangerous under-pressure can develop when the
systems are operated simultaneously. In the event of a fault, the safety system will
switch off one of the air-drawing systems (e.g. the room ventilation system, etc.).
Alternating operation
An approved safety system (e.g. based on under-pressure or temperature readings)
must ensure that the air-drawing system and the appliance cannot be operated at the
same time. Any further processing of the signals must also comply with this safety
philosophy. Shutting down the power supply is permitted and sufficient.
2
Safety
Design Information
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Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com
