Buderus Logano plus GB312 Applications Manual page 18

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Flue/air supply system installation must comply with Part
10, Venting of Equipment, of the National Fuel Gas Code
NFPA 54 (ANSI Z223.1), or CAS B.149 or other applicable
local building code regulations.
The fl ue and air supply system (for design of air supply
connection Section 5.5 ) must be designed
for a max. pressure of 0.40 inches W.C. (100 Pa) for the
overall system (exhaust and air supply system).
Observe the following points when installing the fl ue ducting:
– The cross-sectional area of the fl ue pipe must be
calculated according to the applicable regulations.
– Select the shortest possible route for the exhaust pipe.
– Install fl ue pipes with an upward slope from the boiler
(¼" per foot minimum).
We recommend the fi tting of a protective grille (bird
screen) to the fl ue pipe terminal.
For details of correct dimensioning, contact the venting
manufacturer concerned providing a complete sizing
dimensions of the venting system.
All instructions relating to all parts of the flue
system, and especially the instructions of the
flue system manufacturer, must be followed.
Use only flue pipes with the appropriate di-
ameter for the output rating of the boiler and
made by the recommended manufacturers
listed in Table 6, 7 or 8.
Flue system for multi-boiler systems (cascading
systems)
These instructions relate only to single-boiler systems.
Flue/air supply systems for multi-boiler systems must be
designed by qualifi ed heating engineers and approved
and guaranteed by the fl ue system manufacturer. The fl ue
system must prevent back-fl ow of fl ue gas through boilers
that are not in operation.
In the case of exhaust systems sealed with silicon
from a cartridge, the slilicon must be allowed
to cure for 24 hours before commissioning the
boiler.
Danger: Risk of fatal injury from escaping
flue gases in the boiler room.
• The seal in the condensate pan flue con-
nection must be present, undamaged and
correctly inserted.
• Fitting a barometric damper in the flue
system is not permitted.
Technical specifi cations are subject to change without prior notice
GB312 Applications Manual
Caution: Risk of system damage due to in-
adequate condensate drainage.
• The condensate that forms in the flue pipe
must be drained away from the boiler via
the condensate drain on the condensate
pan.
• Always use a condensate neutralizer.
• Provide periodic maintenance to the
condensate drain piping and neutralizer
system to ensure proper operation.
Caution: Risk of system damage due to in-
adequate condensate drainage.
• In high temperature applications it
is necessary to use mineral oil in
the condensate trap to maintain a
.
trap seal so CO gases do not
escape into the boiler room.
Caution: Disruption of operation due to high
wind.
If no T-piece or 90° downward-turned elbow is
fitted on the end of flue pipe, high winds may
cause the boiler to shut down.
• Always make sure that there is a T-piece
or a 90° downward-turned elbow fitted
depending on the design of the flue system.
• Use only a T-piece or 90° downward-turned
elbow Category IV) made by the selected flue
system manufacturer.
With regard to possible restrictions and in-
spections for flue systems, consult the local
building and fire safety authorities. Observe
the national regulations.
In the Commonwealth of Massachusetts the
legal requirements concerning the installation
and maintenance of carbon monoxide detectors
must be followed.
Danger: Risk of fatal injury due to poisoning
by escaping flue gas.
• After carrying out any of the installation in-
structions referred to, check that all con-
nections throughout the entire flue system
are properly joined and sealed.
• Check seams and joints for leaks.
• Have the entire flue system checked once
a year by a qualified heating contractor.
Logano plus GB312 applications manual | 04.2008