4 Planning and installation – Connections
38
Insulated chimneys used today, consisting of a fireclay or stainless
steel pipe with an insulating jacket and cladding bricks (three shell
design) are to be assigned to groups I - II.
Uninsulated chimneys made of bricks or similar material correspond
to design type III and are unsuitable.
Free-standing chimneys require particularly good insulation.
When evaluating the characteristics of the chimney, also consider
DIN 18160 “Flue systems”.
C
HIMNEY
DIMENSIONS
The system may only be connected to a chimney which has been
dimensioned in accordance with DIN 4705 Part 2, taking account of
the fuel planned and of the expected load. It must also meet local
building regulations (cf. DIN 18160 Part 1 “House chimneys”).
A chimney can only be designed with full knowledge of the on-site
conditions. This includes taking into account the following factors:
•
Location of the house
– Surrounding hills/slopes
– Wind direction
•
Location of the chimney in the roof
– The opening of the chimney must be at least 0.5 m 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 entrance
into the flue to the end of the chimney.
C
ONNECTING
THE
BOILER
TO
THE
CHIMNEY
The boiler must be connected to the flue 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
overlong connecting pieces. If, for constructional reasons, they have
to be longer than 1 m, they should be adequately insulated (at least
5 cm of mineral wool or equivalent material) and, if possible, should
be fitted with an upward inclination.
Summary of Contents for Pelletmaster 15
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