4 Planning and installation – Connections
27
• Location of the chimney in the roof
– The opening of the chimney must be at least 0.5m above the
highest edge of roofs with a slope of more than 20° or at least
1.0 m higher than roof surfaces which slope at 20° or less.
• The effective height of a chimney is measured from the flue
entrance into it to the end of the chimney.
C
ONNECTING THE BOILER TO
THE CHIMNEY
The firing system must be connected with a connecting piece which
is as short as possible, at an angle which is less than 30 - 45° to the
chimney. You should aim for a connecting piece with a maximum
length of 1 m using just one fitting.
Every additional fitting results in a greater pressure loss in the
exhaust path and should thus be avoided. The same is true for overly
long connecting pieces. If, for constructional reasons, these must be
longer than 1 m, they should be adequately insulated (at least 5 cm
of mineral wool or equivalent material) and, if possible, fitted with an
upward inclination.
The following should also be considered:
• The connecting piece may not protrude into the chimney.
• If the system flue gas pipe has a larger diameter than the chimney,
the connecting piece must reduce its diameter to that of the
connection. In this case, the connecting piece should taper as
gently as possible.
• Use bends rather than elbows; the radius of the elbow may not be
less than the diameter of the pipe.
• The chimney should be vertical and straight, if possible without
deformations (take particular care in older buildings).
• All of the cleaning doors and measurement hatches on the
chimney must have tight seals.
• To reduce the entry of additional cold air, only attach one heat
generator per chimney.
• To prevent dust from escaping, the flue pipe must be sealed with
heat-resistant silicone.
1 Auxiliary air unit
2Cleaning door
A) Chimney approx. 30° - 45°
B) Clearance at least 50 cm
Figure 4/3 - Chimney connection
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