Cascade Operation - Flue Gas System Design - Wolf COB Technical Manual And Installation Instructions

Air/flue gas routing
Cascade control with separate, vertical, concentric balanced flue routing, type C33x.
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25 Cascade operation - Flue gas
system design
Oil condensing boilers with a separate, concentric, balanced flue outlet (DN 80/125 or
DN 110/160) above the roof, type C33 x, may only be installed in attics, or in rooms
where the ceiling also forms the roof, or where only the roof construction is located
above the ceiling.
If the pipework for the combustion air supply and flue gas routing crosses different
floors in the building, route the pipes outside the boiler room inside a duct with a fire
resistance of at least 90 minutes, and in living spaces of low height with a resistance
of at least 30 minutes.
To prevent flue gas being drawn back through adjacent roof outlets
Note
where several flue outlets are arranged next to each other and boiler
faults linked to this, arrange the outlets at approximately the same
height and with at least 600 mm between them.
The maximum permissible straight length for concentric balanced flue routing must
not exceed 16 m with an internal diameter DN 80/125, or 21 m with DN 110/160. The
calculated length of the balanced flue routing comprises the straight pipe length and
the length of the pipe bends. In this calculation, an 87° bend is calculated as being
1.5 m and a 45° bend as being 1 m.
min. 600
min. 600
min. 600
KM module
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