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INSTALLER
USERMAINTENANCE TECHNICIAN
TECHNICAL DATA
1.28 FLUE EXHAUST TO FLUE/CHIMNEY.
Flue exhaust does not necessarily have to be connected to a
branched type traditional ue for type B appliances with natural
draught (CCR).
e ue exhaust, for indoor units installed in C conguration, can
be connected to a special LAS type multiple ue.
For B
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congurations, exhaust is only allowed into individual
chimney or directly into the external atmosphere via a relevant
terminal, unless otherwise provided by local regulations.
e multiple ues and the combined ues must also only be con-
nec te d t o t y p e C appl ia nc es of t he s ame t y pe (c onden sa tion), hav-
ing nominal heat inputs that do not dier by more than 30% less
with respect to the maximum that can be attached and powered by
the same fuel.
e thermo-uid dynamic features (ue ow rate, % of carbon di-
oxide, % humidity etc.) of the appliances attached to the same
m u l t i p l e u e s o r c o m b i n e d u e s , m u s t n o t d i e r b y m o r e t h a n 10 %
w i t h r e s p e c t t o t h e a v e r a g e i n d o o r u n i t a t t a c h e d .
Multiple and combined ues must be specially designed accord-
ing to the calculation method and requirements of the standards
(such as UNI 13384), by professionally qualied technical sta.
Chimney or ue sections for connection of the ue exhaust pipe
must comply with requisites of technical standards in force.
It is possible to replace a type C conventional device with one pro-
vided with condensation only, if the derogation conditions estab-
lished by the regulations in force have been veried.
1.29 FLUES, CHIMNEYS AND CHIMNEY CAPS.
e ues, chimneys and chimney caps for the evacuation of com-
bustion products must be in compliance with applicable stand-
ards.
Chimneys and roof-installed exhaust terminals must comply
with the outlet height and with the distance from technical vol-
umes set forth by the technical standards in force.
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Positioning the wall ue exhaust terminals.
e wall ue exhaust terminals must:
- be installed on external perimeter walls of the building
(Fig. 41);
- be positioned according to the minimum distances specied 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.
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