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00BNO9168-I (U0606551)
VARMAX -
Installation, Use and Maintenance
7.7. Checking combustion quality
This check is performed using a calibrated
combustion case. To do this, insert the measuring
stick into the flue outlet (see diagram opposite).
The boiler's starting temperature must be above
70°C.
Do not forget to re-position the stopper on
the orifice from where the sample is taken
afterwards.
For the G20, the CO
2
content measured in these circumstances must be
between 8.3% and 8.7% at Qmini (0% on display) and between 8.8% and
9.2% at Qmaxi (100% on display).
If this is not the case, it is necessary to alter the setting of the gas valve (see
next paragraph).
After this check, it is necessary to either take a measurement of the
"gas" throughput or the ∆P valve on boilers from 120 to 450 kW. These
measurements check the state of soiling of the combustion circuit (burner,
body, exchanger(s)).
For the G31 (relevant modls only), the CO
2
content measured in these
circumstances must be between 9,8% and 10,2% at Qmini (0% on
display) and between 10,4% and 10,8% at Qmaxi (100% on display).
If this is not the case, it is necessary to alter the setting of the gas valve (see
next paragraph).
After this check, it is necessary to either take a measurement of the "gas"
throughput or the ∆P valve. These measurements check the state of soiling
of the combustion circuit (burner, body, exchanger(s)).
For installations with B23 and B23P, we recommend you take this
measurement using a new air filter.
The measurement must be done for a duration of more than 3 minutes to
obtain a sufficiently precise measurement.
If the gas throughput is less than 20% in relation to the value indicated in
paragraph
3.3, page 16, it is necessary to clean the main exchanger and
the burner (see § 7.10 and 7.11).
If you choose to take a measurement of the ∆P valve, refer to the next
paragraph to find out how to do it. If the value measured is lower than the
values defined in the table on page
, it is necessary to clean the main
exchanger and the burner (see § 7.10 and 7.11).
figure 42 -
Sample taking
Flue-gas sample
point
U0501961-A
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