Connecting The Flue Gas Outlet/Air Supply System; Individual Flue Gas Outlet - A.O. Smith Upsilon Installation And Service Manual

7.3 Connecting the flue gas outlet-/air supply system
7.4 Individual flue gas outlet
24
Upsilon-boilers can be used both in an "open" and in "closed" system.
Open: The required combustion air is taken from the immediate environment (boi-
ler room). For this purpose, please comply with the applicable boiler room
ventilation regulations BS 6644.
When using boiler category B23 and B33 as an 'open boiler', the protection degree
of the boiler will be IPX0D instead of IPX4D.
A.O.Smith recommends the application of an air filter on the air intake of the boiler
(available as an accessory with art.nr. 0310288). If no filter is placed there must be
a device (eg. grid) on the air intake of the boiler to be constructed or fitted such a
way that an object with a diameter Ø 16 mm cannot be pushed in.
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 Upsilon-boiler:
-

Individual flue gas outlet

- Collective flue gas outlet under-pressure
- Collective flue gas outlet over-pressure
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
You may opt for:
- Roof terminal (pitched or flat roof)
- Wall terminal
When the boiler is operational, it produces a white plume of condensation. This
condensation plume is harmless but may cause some inconvenience, particularly
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 preventing 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.
A.O.Smith supplies the following roof and wall ducts:
0304264 Roof terminal Ø100 - 150
0302505 Wall terminal Ø100 - 150
Accessory options:
0306017 Lead roof tile ø150 for angled roof
0302509 Roof connection plate ø150 for flat roof
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 A.O.Smith flue literature.
The A.O.Smith flue gas system is meant, and designed, solely for the use on A.O.Smith
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.