HDG M299, Operation Manual

Page: 36 / 176

4 Planning and installation – Connections
36
• Chimney well-sealed to avoid outside air leaking in. Air
penetrating from the outside speeds up the cooling of the flue
gases.
These requirements correspond to chimneys of the type conforming
to DIN EN 13384-1: 2003-03 “Thermal and fluid dynamic calculation
methods”.
Free-standing chimneys require particularly good insulation.
C
HIMNEY DIMENSIONS
The system may only be connected to a chimney which has been
dimensioned in accordance with DIN EN 13384-1, taking into
account the fuel planned and the expected load, and which meets
local building regulations for the installation site.
A chimney can only be designed with full knowledge of the on-site
conditions. This includes taking into account the following factors:
• Building location
– 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 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, 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.
1 Auxiliary air unit
2 Cleaning door
A) Chimney approx. 30° - 45°
B) Clearance at least 50 cm
Figure 4/4 - Connection to the chimney
2
A
B
1