14
910.024.1 - EN (AUS)
INSTRUCTIONS PERTAINING TO THE INSTALLER
12. INSTALLATION OF FLUE AND AIR DUCTS
We guarantee ease and flexibility of instal lation for a gas-fired forced draft boiler thanks to the fittings and fixtures supplied
(described below).
The boiler is especially designed for connection to an exhaust flue / air ducting, with either coaxial, vertical or horizontal
terminal. By means of a splitting kit a two-pipe system may also be installed.
In case exhaust and intake flues not supplied by BAXI S.p.A. have been installed, these must be certified for the
type of use and must have a maximum pressure drop in according to the values reported in the table (par 12.1).
Warnings for the following types of installation:
C
13
, C
33
The terminals for the split flue must be provided
for within a square with 50 cm sides. Detailed
instructions are given together with each
accessory.
C
53
The terminals for combustion air intake and for
the expulsion of combustion products must not
be provided for on opposite walls of the building.
C
63
The maximum pressure drop of the ducts must
not exceed the values reported in the table. The
ducts must be certified for the specific use and
for a temperature of over 100°C. The chimney flue
must be certified in accordance with the prEN
1856-1 Regulation.
C
43
, C
83
The chimney or flue used must be suitable for the
use.
WARNING : To guarantee more operating insurance it
is necessary to assure the flue pipes to the wall using
the apposite clamps.
Figure 7
0310_0104
… coaxial flue - air duct (concentric)
990519_0400
Concentric outlet
Figure 8
This type of duct allows to disengage exhaust gases and to draw com-
bustion air both outside the building and in case a LAS flue is fitted.
The 90° coaxial bend allows to connect the boiler to a flue-air duct in
any direction as it can rotate by 360°. It can moreover be used as a
supplementary bend and be coupled with a coaxial duct or a 45° bend.
If the flue outlet is placed outside, the flue-air ducting must protrude
at least 18mm out of the wall to allow alluminium weathering tile to be
fitted and sealed to avoid water leakages.
Make sure there is a minimum downward slope of 1 cm per metre of
duct towards the boiler.
• A 90° bend reduces the total duct length by 1 metre.
• A 45° bend reduces the total duct length by 0.5 metre.
Flue duct terminal
Max. length
of flue duct
Each 90° bend
reduces the duct
max. length by
Each 45° bend
reduces the duct
max. length by
Flue
terminal
diameter
Outer
terminal
diameter
Coaxial
Ø 110/160 mm
10 m
1 m
0,5 m
163 mm
160 mm
Vertical two-pipe
27 m
0,5 m
0,25 m
163 mm
110 mm
Horizontal two-pipe
27 m
0,5 m
0,25 m
-
110 mm