Checking And, If Required, Adjusting The Gas/Air; Ratio - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

Inspection and maintenance
9.6.2 Checking and, if required, adjusting the gas/air ratio
▶ Switch off the appliance.
▶ Remove the front cover.
▶ Remove the burner cover.
Fig. 39 Removing the burner cover
▶ After converting a gas type, roughly adjust the gas type on the scale
of the gas adjustment nozzle.
– L = n.a.
– H = natural gas
– LPG = liquid propane
38
2.
1.
0010020558-003
1
Fig. 40 Adjusting the gas/air ratio
[1] Adjustable nozzle
▶ Operate the appliance.
▶ Remove the bung from the flue gas test port.
▶ Push the flue gas probe centrally into the flue gas test port.
▶ Seal the test point.
Fig. 41 Flue gas test port
▶ To ensure heat transfer: open the radiator valves.
▶ Set the chimney sweep mode and start up the device at maximum
rated output ( Chapter 9.7.1, page 40).
▶ Measure the CO or O content.
2 2
▶ Check the CO or O content at maximum rated output according to
2 2
Tab. and match if required.
▶ To increase the CO content, turn the adjustable nozzle to the left.
2
▶ To reduce the CO content, turn the adjustable nozzle to the right.
2
Maximum rated
heat output
Gas type CO
2
Natural gas 9.5 %
Liquid gas (LPG) Propane 10.8 %
Liquid gas (LPG) Butane 11.9
Table 25 CO and O contents
2 2
▶ Measure the CO content.
The CO content must be < 250 ppm.
▶ Set the minimum rated output.
▶ Measure the CO or O content.
2 2
Condens 8300i W – 6721841531 (2022/10)
0010040995-001
6 720 614 153-07.2O
Minimum rated
heat output
O CO O
2 2 2
4.0 % 8.6 % 5.5 %
4.6 % 10.2 % 5.5 %
3.2 11.2 5.0