Compare the CO
2
value measured against the value measured under full load.
The CO
2
value at partial load must be within ±0.3 vol% of the CO
2
value measured
or adjusted under full load.
If necessary, adjust the CO
2
value using the adjuster screw until the value is within
0.3 vol% of the CO
2
value under full load.
Fig. BFC 28 to 60 - CO
2
adjustment (partial load)
Fig. BFC 80 to 120 - CO
2
adjustment (partial load)
Note
Turning to the left (anticlockwise) means more less (lower CO
2
level) and turning to the
right (clockwise) means more gas (higher CO
2
level).
Note
After conversion, you must check that the gas control valve is gastight.
Remove the CO
2
measurement probe from the measurement nipple of the flue gas
outlet pipe.
Put the cap back on the measurement nipple of the flue gas outlet pipe.
Shut off the gas supply.
Replace the covers.
7.8.5 Switching pressure measurement
To measure the switching pressure, proceed as follows:
Isolate the appliance from the power supply (see section 4.2.2).
Carefully remove the covers from the appliance.
21.
22.
n
23.
24.
25.
26.
1.
2.
0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17 73
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