Viessmann VITOPLEX 200 Type SX2A Technical Manual page 36

Design information
At least one inspection aperture for checking and cleaning as well as
for checking the pressure must be provided in the flue system.
If the flue pipe is inaccessible from the roof, a second inspection aper-
ture must be provided in the attic behind the chimney cleaning hatch.
Safeguard the unhindered return of the condensate from the flue into
the boiler through an appropriate slope of at least 3º.
The flue system must protrude clear of the roof.
Where the flue pipe is to be installed in an existing chimney, seal any
apertures with appropriate materials and clean the inside of the chim-
ney.
This does not apply to any cleaning or test apertures that are provided
with chimney clean-out covers and that are identified with an appro-
priate test mark.
Minimum distance for secondary ventilation between the internal
cross-section of the duct and the female connection
10
20 b 20
c
VIESMANN
36
(cont.)
30 b 30
d
Note
A flue gas temperature protection is not required in conjunction with
the Vitoradial 300-T. The flue gas high limit safety cut-out ensures that
the max. permissible flue gas temperature of 120 ºC (flue pipe type B)
is not exceeded.
Subject to duct size, install spacers every 2 to 5 m and at each profiled
piece of the flue pipe (e.g. inspection piece or bend).
System size External Minimum internal duct dimension
dimension D
(Ø mm) (mm)
a b c
rectangular
mm
150 184 224 x 224
200 227 267 x 267
d
round
Ø mm
244
287
OIL/GAS BOILERS