Plastic (Pps) Balanced Flue System For Routing Through A Shaft With Balanced Flue Oper- Ation; Internal Shaft Dimensions - Viessmann Vitoladens 300-C Technical Manual

Design and sizing information for the Vitoladens 300-C, -T, and Vitorondens 200-T, 222-F
2.1 Plastic (PPs) balanced flue system for routing through a shaft with balanced flue
operation (type C
For balanced flue operation, a coaxial flue (internal pipe for flue gas,
external pipe for combustion air) is required as a connection piece
between the boiler and the shaft.
Up to 35.4 kW:
Internal flue diameter: Ø 80 mm
Internal diameter, ventilation air pipe: Ø 125 mm
From 42.8 kW:
Internal flue diameter: Ø 100 mm
Internal diameter, ventilation air pipe: Ø 150 mm
2
The connection piece is fitted to the boiler flue connection and must
provide an inspection port.
For installation through shafts or channels with longitudinal ventilation
which meet the requirements for domestic chimney stacks to DIN V
18160-1, or with 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 flue gas inspector should check that the shaft
to be used is suitable and approved for this purpose.
Shafts that were previously connected to oil or solid fuel boilers must
be thoroughly cleaned by a chimney sweep. Loose deposits compris-
ing sulphur and soot must not remain on the inside of the chimney. If
this is not possible, the ventilation air can be routed separately (see
page 31).
Close off and seal any other connection apertures with appropriate
materials.
This does not apply to any cleaning or test apertures that are provided
with chimney cleaning covers and to which an appropriate test mark
has been affixed.

Internal shaft dimensions

a
b
Minimum shaft dimensions to DIN V 18160
Note
According to the approval certificate, internal shaft dimensions smaller
than shown in the table may also be used for balanced flue operation,
if this is indicated by the performance verification to DIN EN 13384.
System size A
80
80 (flexible)
100
100 (flexible)
VIESMANN
10
to TRÖI 2009)
63
a
c
External diameter;
female connection a
Ø mm
94
100
128
125
Check prior to installation whether the shaft runs straight from top to
bottom or if it is corbelled (check with mirrors).
If it is corbelled, we recommend the installation of a flexible flue pipe
(see page 28).
Inside the installation room, at least one inspection port must be pro-
vided in the flue system for checking and cleaning as well as for check-
ing the pressure (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.
Provide an inspection port at the base of the shaft for checking the
secondary ventilation. Safeguard the draining of the condensate from
the flue pipe to the boiler with a fall of at least 3º.
The flue system must be routed to above the roof (protrusion above
the roof according to local regulations).
Alternative plastic flue pipes with Building Regulation approval may be
used, for example, if a larger pipe diameter is required because of
greater flue length. The performance verification to EN 13384 should
then be provided by the respective flue manufacturer.
If flue pipes other than those offered as accessories are used, the flue
system must be checked for tightness by the flue gas inspector prior
to commissioning.
This may be carried out, in accordance with the flue system approval
certificate, by measuring the CO
If this test results in a CO content of more than 0.2 % or an O
2
below 20.6 %, check the flue system.
Minimum internal shaft dimension
b
square or rectangular
(short side)
mm
135
140
170
165
VITOLADENS, VITORONDENS
or O value inside the annular gap.
2 2
content
2
c
round
Ø mm
155
160
190
185