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Adjusting pump rate of integral circulation pump
Curve
Pump rate, circulation pump
A
B
C
D
E
F
G
H
K
L
Checking the balanced flue system for leaks (annular gap check)
Fig. 32
Combustion air aperture (ventilation air)
A
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
or O
2
2
tion air at the annular gap of the balanced flue pipe.
If the CO
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.
10 %
20 %
30 %
40 %
50 %
60 %
70 %
80 %
90 %
100 %
A
concentration in the combus-
2
Commissioning, inspection, maintenance
(cont.)
If actual CO
values are greater or O
2
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.
values are lower,
2
43
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