Baxi POWER HT+ Series Installation And Service Manual page 114

10 Maintenance
Fig. Connecting the flue gas analyser
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MW-3000112-01
C C hecking combustion (reduced thermal flow rate)
1. Unscrew the plug in the flue gas measurement point.
2. Connect the flue gas analyser.
Note
Ensure that the opening around the sensor is completely sealed
when taking measurements.
Insert the sensor into the flue gas measurement point opening
to at least 8 cm for POWER HT+ 1.50 and POWER HT+ 1.70.
Insert the sensor into the flue gas measurement point opening
to at least 9 cm for POWER HT+ 1.90 and POWER HT+ 1.110.
3. Set the boiler's thermal flow rate to 0%.
See
Using the boiler according to thermal output, page 94.
4. Measure the percentage of CO
5. Compare the values measured with the set point values in the Con­
trol and setting values table.
See
CO2 checking and setting values, page 62.
Note
A tolerance of +/- 0.5% is acceptable when the front panel is
closed.
6. If necessary, modify the air/gas ratio.
See
Setting the air/gas ratio (maximum thermal flow rate), page 59.
in the flue gases.
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