Installation & Servicing instructions
AT
AG XL
25
7.3 Connecting the flue gas outlet-/air supply system
XL-boilers can be used both in an “open” and in “closed" system.
Open:
The required combustion air is taken from the immediate environment (boiler
room). For this purpose, please comply with the applicable boiler room ven-
tilation regulations BS 6644.
When using boiler category B23 and B33 as an 'open boiler', the protection de-
gree of the boiler will be IPX0D instead of IPX4D.
An air filter must be fitted on the air intake of the boiler (available as an acces
-
sory with art.nr. AX00540U).
Closed:
The required combustion air is sucked in from the outside through a channel.
This improves installation possibilities within a building. In general, outside
air is cleaner than air from the boiler room.
The following flue gas outlet systems can be used for the XL-boiler:
- Individual flue gas outlet
See chapter 7.4
- Collective flue gas outlet under-pressure
See chapter 7.5, 7.5.1 and 7.6
- Collective flue gas outlet over-pressure
See chapter 7.5, 7.5.2 and 7.6
7.4 Individual flue gas outlet
Opting for an individual flue gas outlet is determined by:
- Favourable position of boilers with regard to outlet area (wall or roof)
- Limited space above the boilers
- Limited number of boilers
We suggest you design a simple flue gas system and air supply system. For further
information about the available components of the flue gas and air supply system we
recommend you consult the ATAG Duopass flue literature.
ATAG supplies the following roof and wall ducts:
RV15RPS0
Roof terminal Ø100 - 150 PP - MZ
RV15WPS0
Wall terminal Ø100 - 150 PP - MW
The flue gas systems described in this document are solely suited for ATAG central
heating boilers. For this purpose the CE Certificate has been supplemented under the
Gastec nr: 0063BQ3021, 0063BT3195 and 0063CM3648.
The flue gas system should be built up using only ATAG Duopass program products.
Combinations with other brands or systems, without permission in writing from ATAG
Heating UK, are not allowed.
When the boiler is operational, it produces a white plume of condensation. This
condensation plume is harmless but may cause some inconvenience, particu-
larly in the case of wall terminal. As a result, roof terminals are preferred.
In a closed installation, roof terminals should be at the same height prevent
-
ing flue gas from being sucked in by the other boiler (recirculation). Outlets in
recesses and near erected walls may also bring about flue gas recirculation.
Recirculation has to be prevented at all times.
The ATAG flue gas system is meant, and designed, solely for the use on ATAG central
heating boilers adjusted to Nat gas or LPG. The maximum flue gas temperatures are
below 70°C (full load 80/60°C)
The proper operation may be adversely influenced by changes of or adjustments to the
correct set up.
