Atag XL-F 105, Manual

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Gas condensing boiler XL - F
Models and output
Application possibilities
Value propositions
Models and output
The XL - F is a condensing and
modulating gas boiler with one or
two pre - mix burners and
avaliable in 7 types within an
output range from 60 to 200 kW.
Application possibilities
The XL - F is applicable for all
central heating sytems built
according to EN12828 with a
maximum target temperature of
90*C.
In cascade applications (max. 8
boilers with boiler/cascade con-
troller) the XL - F can cover instal-
lations up to 1600 kW.
Preferred applications are
central heating and sanitary hot
water production in multi - family
buildings, municipal and
industrial buildings.
Value propositions
A large modulation range that
guarantees along
Description
The XL - F is a fully modulating con-
densing boiler with one or two pre -
mix burners. The control unit of the
boiler adapts the modulation ratio
automatically to the heat demand
requested by the system. This is
done by controlling the speed of
the fan. As a result, the mixing
system will adapt the gas ratio to
the chosen fan speed, in order to
maintain the best possible combus-
tion figures and therewith the best
efficiency. The flue gases created
by the combustion are transported
downwards through the heat ex-
changer and leave at the boiler at
the top into the chimney connec-
tion.
The return water from the system
enters the boiler in the lower sec-
tion, where is the lowest flue gas
temperature in the boiler. In this
section condensation takes place.
The water is being transported
upwards through the heat ex-
changer, in order to leave the boil-
er at the flow connection. The
cross flow working principle (water
up, flue gas down) ensures the
most efficient combustion results.