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1.26 CONFIGURATION TYPE B, OPEN CHAMBER AND
FAN ASSISTED FOR INDOORS.
The appliance can be installed inside buildings in B
23
or B
53
mode;
in this case, all technical rules and national and local regulations
in force, must be complied with.
For installation the cover kit must be used, referred to in (Par. 1.19
)
.
1.27 FLUE EXHAUST TO FLUE/CHIMNEY.
Flue exhaust does not necessarily have to be connected to a branched
type traditional flue for type B appliances with natural draught (CCR).
The flue exhaust, for boiler clots installed in C configuration, can be
connected to a special LAS type multiple flue. For B
23
configurations,
exhaust is only allowed into individual chimney or directly into the
external atmosphere via a relevant terminal, unless otherwise pro-
vided by local regulations. The multiple flues and the combined flues
must also only be connected to type C appliances of the same type
(condensation), having nominal heat inputs that do not differ by more
than 30% less with respect to the maximum that can be attached and
powered by the same fuel. The thermo-fluid dynamic features (flue
flow rate, % of carbon dioxide, % humidity etc.) of the appliances
attached to the same multiple flues or combined flues, must not
differ by more than 10% with respect to the average boiler attached.
Multiple and combined flues must be specially designed according
to the calculation method and requirements of the standards (such
as EN 13384), by professionally qualified technical staff. Chimney
or flue sections for connection of the flue exhaust pipe must comply
with requisites of technical standards in force. It is possible to replace
a type C conventional device with one provided with condensation
only, if the derogation conditions established by the regulations in
force have been verified.
1.28 FLUES, CHIMNEYS AND CHIMNEY CAPS.
The flues, chimneys and chimney caps for the evacuation of com-
bustion products must be in compliance with applicable standards.
Chimneys and roof-installed exhaust terminals must comply with
the outlet height and with the distance from technical volumes
set forth by the technical standards in force.
Positioning the wall flue exhaust terminals.
The wall flue exhaust terminals must:
- be installed on external perimeter walls of the building (Fig. 36);
- be positioned according to the minimum distances specified in
current technical standards.
Combustion products exhaust of natural draught or fan assisted
appliances in open-top closed environments.
In spaces closed on all sides with open tops (ventilation pits,
courtyards etc.), direct combustion product exhaust is allowed for
natural draught or fan assisted gas appliances with a heat input
range from 4 to 35 kW, provided the conditions as per the current
technical standards are respected.
