Requirements For Connection To Chimneys Or Venting Systems - Buderus Logano G234X Installation And Maintenance Instructions Manual

5
Installing the boiler
5.7.2 Requirements for connection to chimneys
or venting systems
The flue connection must comply with the regulations of
the National Fuel Gas Code NFPA 54, Part 7, Venting of
Equipment, and the local building codes. In Canada the
regulations of CAN/CSA B 149.1 as well as local building
codes apply.
Flue connections of heating systems with natural venting
must not be connected with any component of a
mechanically operated venting system that operates with
overpressure.
The cross-section of the flue connection must not be less
than that specified in Tab. 10.
Diameter of the flue gas
Boiler capacity
38
45
55
64
Tab. 10 Cross-section of the flue gas connection
If the boiler is to be connected to a brick chimney, the
chimney must be thoroughly inspected before use. The
chimney must be clean, in compliance with construction
codes and of sufficient dimensions.
Chimneys with an internal liner are preferred and are only
permitted if the liner complies with all national, state and
local construction codes.
Liners of fire-glazed brick with moisture-proof joints and
liners of corrosion-resistant material are recommended.
Contact the local gas supply utility for advice and
recommendations for flue connection and chimney liners.
A flue pipe of single-walled sheet metal is required for flue
connections for type II models.
An adequate chimney height in compliance with the
tables of the National Fuel Gas Code, ANSI Z 223.1, is
required.
Separation of a boiler from a common flue system
If an existing boiler is separated from a common flue
system, the dimensioning of this flue system will be too
big. A proper venting for the remaining heating systems is
then no longer guaranteed.
24
connection
[inches]
7
7
7
8
Logano G234X - Technical specifications are subject to change without prior notice.
Test the venting system by the following
procedure:
Carry out these steps with every heating system that
remains connected to the venting system when the boiler
is separated from a common venting system. Every
heating system must be started in operation and the other
heating systems connected to the venting system must
remain switched off.
A All unused openings of the common system
must be sealed.
B Perform a visual inspection of the venting system
to ensure that it has the correct dimensions and
longitudinal inclination. Make sure that the
system is not blocked, leaking, corroded or has
any other faults that cause it to operate
improperly.
C If necessary, close all doors and windows of the
building. Close all doors between the space in
which the heating systems that remain
connected to the venting system are installed
and the other rooms of the building. Switch off
dryers and all appliances that are not connected
to the venting system. Run all venting fans and
bathroom exhaust fans at maximum speed. Fans
in use in summer must remain in operation and
oven exhaust system flaps must be closed.
D Start up the heating system to be tested. Follow
the instructions for commissioning. Set the
thermostat for continuous operation.
E After the main gas burner has been operating for
five minutes, check the opening at the back flow
check for drafts with a match flame or a candle,
or with the smoke of a cigarette, cigar or pipe.
F Check this way that all heating systems that
remain connected to the venting system have
been checked as above to ensure that the
venting operates properly. Then place all doors,
windows, venting fans, exhaust system flaps, and
all other gas fired appliances back into their
original state.