Use heat-insulated fireclay flues that are
insensitive to damp.
The flue gas temperature can be less
than 100°C.
The system must only be connected to the flue if the flue
meets the legal requirements and the technical specifications.
The flue must be matched to the boiler output and
dimensioned in accordance with DIN 4705. In order to be able
to accurately dimension the flue, the calculations must be
based on the flue gas figures. When designing new flues, high
thermal insulation chimneys (DIN 18160 T1 heat transmission
resistance group I) or suitable fireclay flues that are
insusceptible to damp and have general building regulation
approval should be used. It is advisable to involve those
responsible for approving the flue system early on in the
planning phase.
Flue height The minimum flue height is 5 - 10 m depending on boiler
output. The flue must terminate at least 0.5 m above the
highest part of the building. In the case of flat rooves, the flue
must terminate at least 1.5 m above the surface of the roof.
Flue diameter The flue hast to adjust on the fire power. The following datas
are approximate values and could be used for planning. We
recommend to calculate the flue by a professional.
PH 30 / 50 / (PC 50-S)
PH 75 / (100)
eff. high above 6 m D = 160 (180) mm
eff. high under 6 m D = 180 (200) mm
eff. high above 6 m D = 220 (250) mm
eff. high under 6 m D = 250 (250) mm
Flue dimensioning data Dimension the flue for rated output!
(Averaged figures with used heat exchanger)
Rated output:
Type Flue gas CO2 Mass flow rate
Required
draught
PH 30 180°C 12,5% 0,025 kg/s 15 Pascal
PH 50 190°C 13,0% 0,040 kg/s 15 Pascal
PC 50-S 185°C 12,5% 0,040 kg/s 15 Pascal
PH 75 180°C 12,5% 0,065 kg/s 15 Pascal
PH100 195°C 12,5% 0,082 kg/s 15 Pascal
Sub-maximum output:
Type Flue gas CO2 Mass flow rate
Required
draught
PH 30 130°C 9,5% 0,010 kg/s 2 Pascal
PH 50 145°C 10,0% 0,015 kg/s 2 Pascal
PC 50-S 140°C 9,5% 0,015 kg/s 2 Pascal
PH 75 140°C 9,5% 0,020 kg/s 2 Pascal
PH100 150°C 10,5% 0,025 kg/s 2 Pascal