Installation And Position Of Inspection Ports; Plastic (Pp) Balanced Flue System For Routing In A Shaft - For Room Sealed Operation; 93X To Cen/Tr 1749); Internal Shaft Dimensions To Din V 18160 - Viessmann Vitodens 100-W Technical Manual

Design and sizing information for connection on the flue gas side

Installation and position of inspection ports

Correct position of the in-
spection port
A
A Inspection port
2.3 Plastic (PP) balanced flue system for routing in a shaft – for room sealed operation
(type C to CEN/TR 1749)
93x
For room sealed operation, a coaxial flue (internal pipe for flue gas,
external pipe for combustion air) is required as a connection piece
between the Vitodens and the shaft.
The connection piece is fitted to the boiler flue connection and must
contain an inspection port.
Note
Gas condensing boilers with a total rated heating output greater than
100 kW may only be installed in rooms that provide ventilation air
apertures to the outside; see page 35.
For routing through shafts or ducts with longitudinal ventilation which
meets the requirements for chimneys to DIN V 18160-1, or have a
fire rating of 90 minutes (L90), or a fire rating of 30 minutes (L30) for
buildings in categories 1 and 2 (max. 2 storeys).
Prior to installation, the relevant flue gas inspector should check that
the shaft to be used is suitable and approved for this purpose.
Ventilation air ducts with which oil or solid fuel boilers were previ-
ously used must not contain any sulphur or soot deposits on the
inner surfaces of the chimney. Sulphur and soot deposits cause
faults. If thorough cleaning is not possible, a balanced flue pipe must
be laid through the shaft. Alternatively, a separate balanced flue can
be routed. Viessmann accepts no liability for damages caused by a
failure to observe these stipulations.
Close off and seal any other connection apertures with appropriate
materials.
This does not apply to any cleaning or inspection apertures that are
provided with chimney cleaning covers and that are identified with an
appropriate test mark.
Check prior to installation whether the shaft runs straight from top to
bottom or if it is offset (check with mirrors).

Internal shaft dimensions to DIN V 18160

a
b
VITODENS, VITOSOLAR
Incorrect position of the inspec-
tion port
A
A
A Inspection port
a
c
Design the inspection ports to ensure that no condensate can collect
around them. Collected condensate would lead to an increase in
acid concentration and possible gasket damage. Install the inspec-
tion pieces with the port at the top/in the upper section.
If the chimney is offset, we recommend installing a flexible flue pipe
(see page 18).
In the installation room, at least one inspection port must be provi-
ded in the flue system for inspection, cleaning and pressure testing
(if required). If the flue pipe is inaccessible from the roof, a second
inspection port must be provided in the attic behind the chimney
cleaning hatch. For further information, see the FeuVO [check local
fire regulations]
Provide an inspection port at the base of the shaft for checking the
secondary ventilation. Safeguard the unrestricted draining of the
condensate from the flue into the boiler through an appropriate fall of
at least 3°.
The flue system must be routed to above the roof (protrusion above
the roof in accordance with the Landes-FeuVO – check local fire reg-
ulations).
Alternative CE designated flue pipes may be used, e.g. if a larger
pipe diameter is required for longer flue lengths. The performance
verification to EN 13384 should then be provided by the respective
flue manufacturer.
If flue pipes other than those offered as accessories (certified as a
system with the Vitodens) are used, the flue system must be
checked for tightness by the flue gas inspector prior to commission-
ing.
This may be carried out, in accordance with the flue system approval
certificate, by measuring the CO
Check the flue system for tightness if this test results in a CO
tent above 0.2 % or an O content lower than 20.6 %.
2
(cont.)
or O value inside the annular gap.
2 2
con-
2
VIESMANN
2
13