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

NOTICE: Risk of boiler damage from contaminated
combustion air!
▶ Never use cleaning agents containing chlorine and
never use halogenated hydrocarbons (as, for
example, contained in spray cans, solvents, cleaning
agents, paints and adhesives).
▶ Do not store or use these substances in the boiler
room.
▶ Avoid excessive dust accumulation.
If impurities in the combustion air are possible (e.g.
installation near swimming pools, dry cleaners or
hairdressing salons), sealed combustion is
recommended.
Total air supply from inside the building
Make sure that the boiler room has two permanent air vents that are
connected to one or more other rooms. When calculating the cross-
sectional areas of the vent apertures, the total burner output of all gas-
fired appliances in the connected rooms must be taken into account.
Each vent must have a minimum cross-section of one square inch per
2
1000 Btu/h (2200 mm /kw) of the total burner output of all gas-fired
appliances inside the connected rooms. Make sure that the cross-
sectional area of each vent is at least 100 square inches (0.06 m
of the vents must be no more than 12 inches (300 mm) from the ceiling
and the other no more than 12 inches (300 mm) from the floor of the
boiler room, measured from the outer edge of the vent aperture.
The smallest dimension of all air intake and outlet openings must be not
less than 3 inches (80 mm).
Total air supply from outside the building
Make sure that the boiler room has two permanent air vents, one of
which must not be more than 12 inches (300 mm) from the ceiling and
the other not more than 12 inches (300 mm) from the floor of the boiler
room, measured from the outer edge of the vent aperture. The vents
must be connected either directly or via air ducts to the outside or to
rooms that have an unobstructed connection to the open air (crawl
passage or roof space). The smallest dimension of all air intake and
outlet openings must be not less than 3 inches (80 mm).
• If there is a direct connection to the outside, each opening must have
a minimum cross-section of one square inch (25 mm
2
h (550 mm /kW) of the total combustion output of all gas-fired
appliances inside the closed room.
• If there is a connection to the outside through a ventilated attic with
vertical ventilation ducts, each vent aperture must have a minimum
cross-section of one square inch per 4000 Btu/h (550 mm
the total burner output of all gas-fired appliances inside the closed
room.
• If there is a connection to the outside through a ventilated attic with
vertical ventilation ducts, each vent aperture must have a minimum
cross-section of one square inch per 2000 Btu/h (1100 mm
the total burner output of all gas-fired appliances inside the closed
room.
• If the openings are connected to ventilation ducts, the ducts must
have the same cross-section area as the openings.
Logano G234X – 6 720 804 886 (2012/08)

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.
Boiler capacity
38
45
55
64
Table 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
2
). One
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.
Test the venting system by the following procedure:
Carry out these steps with every heating system that remains connected
2
to the venting system when the boiler is separated from a common
) per 4000 Btu/
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.
2
/kW) of
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.
2
C If necessary, close all doors and windows of the building. Close
/kW) of
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.
Boiler installation
Diameter of the flue gas connection
[inches]
7
7
7
8
5
15