10
“Murelle 20 BFR-BF” models
“Murelle 25 BF” model
KEY
A Discharge pipe
B Intake pipe
It is not allowed to replace SIME accessories with other
devices. Some of the connecting systems that may be
adopted are shown in Fig. 12.
2.7
“MURELLE BF” SEPARATE AIR
INTAKE-FLUE OUTLET PIPES
The sum of the development of the air intake-flue outlet
pipes enables a maximum distance of 16 m to be rea-
ched without change of direction.
When installing the pipes, follow closely the requirements
of current standards, as well as the following practical
pointers:
– the temperature on the surface of the discharge pipe,
in the portions that pass through masonry and/or
come into contact with walls should not exceed room
temperature by more than 60°C (pr EN 483);
– with direct intake from outside, when the pipe is longer
than 1 m, you are recommended to insulate the piping
so as to prevent formation of dew on the outside of the
piping during particularly severe periods of the year;
– with the outlet pipe outside the building or in cold
indoor environments, insulation is necessary to pre-
vent burner failure in starting. In such cases, provide
for a condensate-collector system on the piping.
2.7.1
Assembly of separate-pipe kit
The accessories needed for assembly are available on
request in a kit (Code 8089902). The kit includes (Fig.
13/a):
– Discharge pipe flange ø 80 mm with fixing screws and
lip seal ø 90
– Sponge-rubber gasket
– Air diverter with fixing screws (“20 BF” vers.)
– Air-intake pipe collar ø 80 with fixing screws, sectored
diaphragm ø 38 and lip seal ø 90
The sectored diaphragm ø 38 is to be used according to
the maximum head loss allowed in both pipes, as given
in Table 6.
KEY
1 Vertical extension L. 200
2 Extension L. 855
3 Tile with articulation joint
4 Roof outlet terminal
5 Supplementary 90° elbow
Fig. 12
Fig. 13
