Wolf FGB-K Series Installation And Maintenance Instructions For Contractors page 81

Connection to a moisture-resistant room sealed
balanced flue chimney, flue gas chimney or flue system,
type C 43x
Horizontal balanced flues must not be more than 2 m long
when connecting the system to a balanced flue chimney.
The room sealed balanced flue chimney must be certified
by DIBT - Deutsches Institut für Bautechnik [Germany] or
CE-designated and must be approved for condensing
operation with positive pressure / negative pressure
respectively.
For sizing, use calculations to EN 13384.
Connection to a moisture-resistant flue gas chimney or a
flue system type B33 for open flue operation
Horizontal balanced flues must be no longer than 2 m when
connecting the system to a flue gas chimney. In addition to
the boiler connection bend, up to two 90° diverters may be
installed.
The flue gas chimney must be certified by DIBT [Germany]
or CE-designated, and must be approved for condensing
operation.
If necessary, obtain the connection piece from the chimney
manufacturer.
The air apertures to the boiler room must be completely free
from obstruction.
Connection to a moisture-resistant flue type B23 for
open flue operation
For this version, observe the regulations concerning
ventilation for boiler rooms acc. to DVGW-TRGI.
Fig: Cascade
3064458_201811
31. Technical information, balanced flue
Connection to a moisture-resistant flue, type C53, C83x,
for room sealed operation
For horizontal air ducts, a maximum length of 2 m is
recommended. Observe special requirements for flues that
are not surrounded by combustion air acc. to DVGW-TRGI
2008 and all locally applicable combustion regulations.
Connection to a combustion air and flue gas system type
C63x that is not tested together with the gas combustion
equipment
Original Wolf components are designed for long-term use,
are designated with the DVGW quality seal and are matched
for use with Wolf gas condensing boilers. When using third
party equipment that is only DIBT certified or CD-designated,
the installer himself is responsible for the correct sizing and
trouble-free function of the system. Faults, material losses
and injuries resulting from incorrect pipe lengths, excessive
pressure drop, premature wear with escaping flue gas and
condensate or incorrect function, e.g. through components
working themselves loose, are excluded from our warranty if
non-approved third party equipment is used.
If the combustion air is drawn from the shaft, the shaft must
be free from contamination.
Multiple connections / cascade
These boilers are suitable for multiple connections to a shared
chimney in accordance with DVGW Code of Practice G 635.
An internal non-return valve is used to prevent a return flow of
flue gas. The plumb clearance between two gas boilers must
be at least 2,5 m. The installed flue system must be approved
for multiple connections to a shared chimney. The approval
must be verified by relevant calculations in accordance with
fire protection regulations.
Fig: Multiple connection
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