Check The Combustion - Baxi POWER HT+ Series Installation And Service Manual

10 Maintenance
Fig. Connecting the flue gas analyser
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MW-3000110-01
C C aution
Respect the torque of the burner fastening screws: 5 N.m +/- 0.5.
Caution
Always use a new tightness gasket to reconnect the gas supply.
3. Reconnect the ignition electrode, the safety thermostat on the com­
bustion chamber door and the flame detection sensor.
Note
Do not forget to remount the ignition transformer on the burner.
4. Open all valves.
5. Check the tightness of the burner using a leak detection spray.
6. Put the covers back in place on the boiler.
Note
For the POWER HT+ 1.50 and POWER HT+ 1.70 models, put the
panel located in front of the burner back in place.
7. Reconnect the ground wire.
8. Start up the boiler again.
See
Commissioning procedure, page 57.

10.2.7 Check the combustion

Checking combustion (maximum 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 100%.
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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