Mikrofill Ethos RS 350, Техническая документация инструкция

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INSTALLATION
18 TECHNICAL DOCUMENTATION
FLUE LENGTH
Since the boiler is equipped with a ‘premix burner’ with a fan, an over pressure is created in the boiler. This over
pressure is sufficient to overcome the resistance of the burner, the heat exchanger and the chimney.
The back pressure on the boiler depends on:
• the resistance of the flue pipe.
• the degree of cooling of the combustion gases.
• the resistance of the air inlet and discharge outlet.
The degree of cooling of the combustion gases depends on the following:
• the insulation value of the flue.
• the ambient temperature.
• the flue system and outlet.
There is a maximum over pressure of around 2.0 mbar (200 Pa) for the ETHOS RS 350 and 2.5 mbar (250 Pa) for
the ETHOS RS 550 in the boiler for the flue gas discharge system.
The maximum draught permissible is 0.2 mbar (20 Pa), this should be checked with the flue warm and boilers
not firing. If the draught is above this then flue stabilisers are recommended.
CALCULATION OF DIAMETER AND LENGTH
For the calculation and control of the inner diameter of a discharge system with mechanical discharge,
please refer to the applicable national and local standards and regulations.