Installation Of The Roof Penetration Of A Vertical Flue System; Connecting The Air Supply (For Direct Vent Operations) - Buderus LOGANO PLUS GB312 Installation Instructions Manual

6
Installing the boiler
6.4 Installation of the roof penetration of a vertical flue
system
All instructions issued by the flue system manufacturer
concerned regarding the fitting of the roof termination
must be followed. Use only those that are required for
the necessary flue pipe diameter. The use of a T-piece or
a 90°-elbow as the external terminal for the flue pipe is
required.
Always make sure that the flue is connected with a
downward slope towards the boiler ( ¼ " per foot).
Observe the clearances for the roof termination above the roof
( Fig. 14).
If the flue passes through ceilings at any points, fire plates
( Fig. 14, [2]) must be installed.
10 Min
Fig. 14 Vertical flue system
[1] Roof penetration
[2] Fire protection collar
[3] Fastening the flue pipe
[4] Flue pipe adaptor (available separately)
20
6.5
The combustion air is supplied to the boiler either through an external
wall connection, through a chimney flue or through a separate pipe in the
chimney flue. For direct vent operation, a suitable air supply system
must be used (made of PVC or CPVC, galvanized steel or other suitable
material).
The flue and air supply system (for design of flue connection
 Section 6, page 17) must be designed for a max. pressure of
0.40 inches W.C. for the overall system (flue and air supply system).
Use tab. 9 or refer to the GB312 Application Manual for detailed
descriptions of maximum permissible vent lengths and dimensioning of
exhaust venting systems.
Boiler
capacity
120 - 4
1
160 - 5
200 - 6
2
240 - 7
280 - 8
Table 9 Air supply volumetric flow rate/Air supply pipe diameter
▶ Remove the side panel if not already removed.
▶ Unscrew the cover plate from the rear panel.
3
3
4
▶ Connect the air pipe 90° elbow to the air pipe socket through the rear
panel and seal.
7 747 010 720-14.2RS
▶ Construct the air supply pipe using a standard air pipe system
according to the national requirements.
We recommend the fitting of a protective grille (bird screen) to the air
pipe terminal. For details of correct dimensioning, contact the
manufacturer concerned.
Fig. 15 Connecting the air supply for balanced
[1]
[2]

Connecting the air supply (for direct vent operations)

We recommend that the air supply pipe diameter
matches the flue pipe diameter.
Required air supply
volumetric flow rate
3
[ft /m]
N
90 - 4 95
95
130
160
190
220
To avoid problems when fitting the gas connection, it is
best to fit a 90° elbow for the air pipe connection.
flue operation
Screw
Cover plate
Logano plus GB312 – 6 720 647 367 (2012/11)
Recommended air supply
pipe diameter
[inches]
5
6
6
8
8
8