4
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Set-up and installation
FA ROTEX A1 BOe - 02/2014
11
The Oil condensing boiler series A1 BO are basically designed
for operation in the
room-air independent
mode. They are fitted
with a concentric flue gas /air supply pipe DN 80/125.
4.2.1 Operation independent of ambient air
Set-up version 1
The ROTEX A1 BO is connected to the chminey or a suitable
installation shaft using the concentric LAS connector line
Set C
or
Set D
.
– The combustible air supply from the outside runs through the
chimney or through an installation shaft.
– The flue gas discharge using a flue gas pipe to the outside
runs through the same shaft as the air supply.
– Minimum distance between flue gas exit and roof ridge:
40 cm
.
Set-up version 4
The ROTEX A1 BO is connected by the
Set C
or
Set D
concentric LAS connection lines to the
SET G
exterior wall
system.
– The combustible air supply from the outside runs through the
ring-shaped gap in the dual tube, through the outer wall (suc-
tion from below).
– The flue gas discharge to the outside runs through a concen-
tric pipe, through the outer wall and then up to at least
40 cm
over the roof surface. In the external area, the outer air gap
serves as heat insulation for the flue gas pipe.
Set-up version 5
The ROTEX A1 BO is placed directly under the roof. Connected
with
SET F
.
– The combustible air supply and flue gas discharge run
through a concentric dual pipe.
– The combustible air supply from the outside runs through the
outer ring-shaped gap of the dual tube and the flue gas dis-
charge to the outside runs through the inner tube.
– Minimum distance between flue gas exit and roof surface:
40 cm
.
– Minimum height of the flue gas pipe:
2 m
.
Set-up version 6
The ROTEX A1 BO does not stand directly under the roof. The
dual tube for the combustible air supply and flue gas pipe runs
through the roof truss.
– The combustible air supply and flue gas discharge run
through a concentric dual pipe (such as Set-up version 5).
– In the area of the roof truss, the dual tube for the combustible
air supply and the flue gas pipe must be laid through a protec-
tive pipe with sufficient fire resistance or be structurally sepa-
rated from the roof truss.
4.2.2 Operation partially independent of ambient air
If the flue gas pipe is too high (see tab. 4-4), it may be advisable
to suction the supply air through a separate air supply line with
lower resistance.
The ROTEX A1 BO is operated with separately routed inlet air/
flue gas lines (2 line system).
– Combustion air inlet is routed from the outside via the ade-
quately sealed inlet air through the external wall. The air inlet
line should be sized so that the
suction resistance
at nomi-
nal power is
less than 50 Pa
.
– Flue gas dissipation to the outdoors is via the chimney or an
installation shaft. If the connection line between the ROTEX
A1 BO and the installation shaft is single-walled or is not com-
pletely surrounded by combustion air, a
ventilation opening
of at least
150 cm
2
is required.
Appropriate measures must be taken to ensure that the
burner cannot be operated if the ventilation opening is closed.
– The installation shaft where the flue gas line runs must be rear
ventilated. In the lower area there must be a rear ventilation
opening of at least
150 cm
2
must be provided.
Use of the ROTEX A1 BO in operation independent of
room air with concentric flue gas/air intake is recom-
mended by ROTEX. If possible, choose this set-up!
In the event of limited room-air independent operation
(separate flue gas/ air intake) and in the event of room-
air dependent operation, the installation room must
have a ventilation opening of at least
150 cm
2
to the
outside.
This reduces the overall energy efficiency of the
building in the framework of the European Guideline
2010/31/EU: EPBD.
In some cases, the resonance in the flue system can
amplify the noise at the mouth of the flue gas pipe. The
noise level can be effectively reduced with the applica-
tion of a silencer (
E8 MSD,
15 45 78
bzw.
E11 MSD,
15 45 79
).
Air suction noises are generated during ambient air-
dependent operation. The noise level can be effectively
reduced with the application of a silencer (
G ZLSD,
15 45 77
).
If the wall penetration is at a height of less than a meter
above the ground, ROTEX recommends introducing
the combusion air through a separate intake air pipe
(installation height: about 2 m).
W8 ZR,
15 50 79.00 66
or
W11 ZR,
15 50 77.00 30
.
