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Installation and Service Manual Upsilon-Series
24
7.3 Connectingtheuegasoutlet-/airsupplysystem
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lterontheairintakeoftheboiler
(availableasanaccessorywithart.nr.0310288).Ifnolterisplacedtheremustbe
adevice(eg.grid)ontheairintakeoftheboilertobeconstructedorttedsucha
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 ue gas outlet systems can be used for the Upsilon-boiler:
- Individual ue gas outlet
- Collective ue gas outlet under-pressure
- Collective ue gas outlet over-pressure
7.4 Individualuegasoutlet
Opting for an individual ue 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 at 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ue
gasfrombeingsuckedinbytheotherboiler(recirculation).Outletsinrecesses
andnearerectedwallsmayalsobringaboutue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 at roof
We suggest you design a simple ue gas system and air supply system. For further
information about the available components of the ue gas and air supply system we
recommend you consult the A.O.Smith ue literature.
The A.O.Smith ue 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 ue gas temperatures
are below 70°C (full load 80/60°C)
The proper operation may be adversely inuenced by changes of or adjustments to the
correct set up.
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