Bedienungsanleitung Bosch Condens GC7000WP (Seite 24 von 52) (Englisch)

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Commissioning

Condens 7000 WP – 6721841195 (2022/01)

8.6 Measuring of CO2 and CO (full load)

The CO content in the flue gases must be less than 250 ppm (0.025 %

by volume) during combustion without excess air. If the CO content

exceeds 250 ppm, this will be due to pollution of the burner, malfunction

of the burner or recirculation of the flue gases.

▶ Switch off the appliance.

▶ Remove the plug on the test point for flue gas [1].

Fig. 32 Remove the plug on the flue outlet

[1] Test point for flue gas

[2] Test point for air supply

▶ Make sure that the boiler can release its heat.

▶Insert the lance of the flue gas analyser 10 cm into the test point.

▶Operate the appliance.

▶Open the menu Function check > Burner.

▶Start the Function check by setting the value to 100%.

▶Measure the CO content.

▶Determine and eliminate the cause of the potentially high CO

content.

▶Make a note of the CO content in the commissioning report ( §

15.7, p. 50).

▶Measure the CO percentage.

▶Check the measured value ( table 11, p. 24).

▶ Only modify the CO level if the measurement is outside

the specified range.

▶Make a note of the measured CO2 slevel in the commissioning

report

 § 15.7, p. 50).

▶Deactivate Function check.

▶Remove the flue gas analyser.

▶Fit the plug on the test point for flue gas.

Setting data

Table 11 Setting data

8.7 Measuring the gas/air ratio (minimum load)

▶ Switch off the appliance.

▶ Make sure the heating system can release its heat.

▶ Open the gas/air ratio test port by turning the adjusting screw

through 2 revolutions (§ 8.3, p. 23).

▶ Set the pressure gauge to “0”.

▶ Connect the pressure gauge to the test port.

▶ Open the menu Function check > Burner.

▶Start Function check by setting the smallest possible value.

▶ Check the measured value ( table 11, p. 24).

▶ Only modify the gas/air ratio if the measurement is outside the

specified range.

The gas/air ratio adjusting screw is underneath the cover.

▶ Make a note of the measured value [Pa] in the commissioning report

( § 15.7, p. 50).

▶Deactivate Function check.

▶ Close with the gas/air ratio test port.

8.8 Reading off the ionisation current

▶ Open the menu Function check > Burner.

▶Start Function check by setting the smallest possible value.

▶ Open the menu Info > Ionisation current.

▶ Reading off the ionisation current.

The ionisation current must be at least 2 A.

▶ If the value is lower, check the gas/air ratio and the igniter.

▶ Make a note of the value that has been read off [A] in the

commissioning report ( § 15.7, p. 50).

▶Deactivate Function check.

Appliance type: Gas type CO2

percentage

Gas/air ratio

[%] [Pa]

GC7000WP 50 Natural gas H

(G20)

9.3 ± 0.3

-5 ± 4

Natural gas L

(G25)

9.1 ± 0.3

Propane L

(G31)

10.0 ± 0.3

0010034264-002

GC7000WP 65 Natural gas H

(G20)

9.3 ± 0.3

-5 ± 4

Natural gas L

(G25)

9.1 ± 0.3

Propane L

(G31)

10.0 ± 0.3

GC7000WP 85 Natural gas H

(G20)

9.1 ± 0.3

-5 ± 4

Natural gas L

(G25)

9.1 ± 0.3

Propane L

(G31)

10.0 ± 0.3

GC7000WP 100 Natural gas H

(G20)

9.1 ± 0.3

-5 ± 4

Natural gas L

(G25)

9.1 ± 0.3

Propane L

(G31)

10.0 ± 0.3

Appliance type: Gas type CO2

percentage

Gas/air ratio

[%] [Pa]

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