Viessmann Flue gas system, Руководство по установке

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General installation instructions
(cont.)
Leak/soundness test
Flue gas system with Building Regulations approval -
Routing through a duct
After their installation, flue gas systems
routed through a duct must be tested for
soundness by a competent person as per
the Building regulations.
n
Pressurised flues inside buildings that are
not surrounded by combustion air (open
flue) must be pressure tested.
To pressure test a flue, air is pumped into
the flue that has been sealed at the top
and bottom using a flue test device, until
a pressure of 200 Pa has built. Whilst
maintaining this pressure, the volume
of air that escapes through leaks is
established.
Up to a leakage rate of 0,006 litres/ (s x
m
2
), relative to the internal surface area,
is considered as indication that the flue is
sound.
n
In pressurised flue gas systems that are
surrounded by combustion air (balance
flue), the soundness can be checked by
testing the O
2
content in the combustion
air (annular gap test).
The flue is reckoned to be sufficiently
sound if the O
2
content in the combustion
air deviates by no more than the following
values from the reference value. The
reference value results after the self-
adjustment of the test equipment:
– for flues with general Building
Regulations approval 0.4% by vol.
– for other flues 0.2% by vol.
Flue gas systems as technical units with Vitodens and Vitoladens
n
Balanced flue roof outlet (C
33x
)
n
Balanced flue external wall terminal (C
13x
)
n
Routing over external walls (C
53x
)
n
Separate ventilation and flue gas routing
(C
53x
)
We recommend that a simple soundness
test is carried out during the commissioning
of your system. For this it would be
sufficient to check the CO
2
concentration in
the combustion air at the annular gap of the
balanced flue pipe. The flue pipe is deemed
to be sound if the CO
2
concentration in the
combustion air is no higher than 0.2% or
the O
2
concentration is at least 20.6%.
If higher CO
2
or lower O
2
values are
measured, check the flue system for
soundness.
3
5458 035 GB