40
Curve
Pump rate, circulation pump
A
10 %
B
20 %
C
30 %
D
40 %
E
50 %
F
60 %
G
70 %
H
80 %
K
90 %
L
100 %
Checking the balanced flue system tightness (annular gap check)
A
Fig. 32
A
Combustion air aperture (ventilation air)
For balanced flue systems tested together with the
heat generator, there is no requirement for a tightness
test (overpressure test) during commissioning by the
flue gas inspector.
In this case, we recommend that a simple tightness
test is carried out during system commissioning. For
this, check the CO
2
or O
2
concentration in the combus-
tion air at the annular gap of the balanced flue pipe.
If the CO
2
concentration is less than 0.2 % or the O
2
concentration is greater than 20.6 %, the flue pipe is
deemed to be sufficiently gas-tight.
If actual CO
2
values are greater or O
2
values are lower,
then pressure test the flue pipe with a static pressure
of 200 Pa.
!
Please note
If the test port is not sealed, combustion air is
drawn in from the room.
After the tightness test, re-seal the test port with
the plug.
Commissioning, inspection, maintenance
Adjusting the pump rate of the integral…
(cont.)
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