Installing The Wall Exit For Air Supply Pipe - Buderus Logano plus GB312 Applications Manual

GB312 Applications Manual
5.1 Connecting the air supply (for direct vent
operations)
The combustion air is supplied to the boiler either through
an external wall connection, through a chimney fl ue or
through a separate pipe in the chimney fl ue. For balanced
fl ue operation, a suitable air supply system must be used
(made of PVC or CPVC, or galvanized steel).
The fl ue and air supply system (for design of fl ue connection
Section 6, page 21) must be designed for a max.
pressure of 0.40 inches W.C. for the overall system (exhaust
and air supply system).
We recommend that the air supply pipe
diameter matches the flue pipe diameter.
Boiler rat- Required air supply
ing volumetric flow rate
3
[ft /min]
9 0 - 4 9 5
120 - 4 95
1 6 0 - 5 1 3 0
200 - 6 160
2 4 0 - 7 1 9 0
280 - 8 220
Tab.9 Air supply volumetric flow rate/Air supply pipe
diameter
10 Min
Fig. 9 Vertical flue system
1 Roof penetration
2 Fire protection collar
3 Fastening the flue pipe
4 Flue pipe adaptor (available separately)
Logano plus GB312 applications manual | 04.2008
Recommended air supply
pipe diameter
[inches]
5
6
6
8
8
8
1
2
3
3
4
7 747 010 720-14.2RS
• Remove the side panel if not already removed.
• Unscrew the cover plate from the rear panel.
Fig. 10 Connecting the air supply for balanced flue
operation
1 Screw
2 Cover plate
Use a 90° elbow for the combustion air inlet
at the entrance to the boiler to avoid an
interference with the gas connection.
• Connect the air pipe 90° elbow to the air pipe socket
through the rear panel and seal.
• Construct the air supply pipe using a standard air pipe
system according to the national requirements.
• After making the connection at the boiler, increase air
supply pipe to sizes shown in Table 9 external to boiler
We recommend the fi tting of a protective grille (bird
screen) to the air pipe terminal. For details of correct
dimensioning, contact the manufacturer concerned.

5.2 Installing the wall exit for air supply pipe

To prevent possible recirculation of exhaust gas, the exhaust
system installer must take account of effects such as the
prevailing wind conditions, any eddy zones, the specifi cs
ofthe site, etc. in the design of the fl ue and air supply sys-
tems. Buderus can not be held responsible for such poten-
tially detrimental effects on boiler operation. The
clearances detailed or illustrated in Fig. 12 and Fig. 16
should be seen as the absolute minimum and may in some
circumstances not be adequate for specifi c installations.
Technical specifi cations are subject to change without prior notice
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