Bedienungsanleitung A.O. Smith Upsilon UB-70 (Seite 24 von 68) (Englisch)

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Installation and Service Manual Upsilon-Series

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boilertobeconstructedortted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 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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