Bedienungsanleitung Bosch Condens GC7000WP (Seite 23 von 52) (Englisch)

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Commissioning

Condens 7000 WP – 6721841195 (2022/01)

8.3 Setting options for air/gas ratio control valve

Different air/gas ratio control valves are used depending on the rating

of the boiler. The positions of the various test ports and adjusting

screws vary accordingly.

Overview of air/gas ratio control valve GC7000WP 50, GC7000WP

Fig. 30 Overview of test ports and adjusting screws ≤ 70 kW

[1] Adjusting screw CO2/O2

[2] Gas pre-charge pressure test port

[3] Gas/air ratio test port

[4] Gas/air ratio adjusting screw

Overview of air/gas ratio control valve GC7000WP 85, GC7000WP

100

Fig. 31 Overview of test ports and adjusting screws ≥ 85 kW

[1] Adjusting screw CO2/O2

[2] Gas pre-charge pressure test port

[3] Gas/air ratio test port

[4] Gas/air ratio adjusting screw

[5] Without function

8.4 Measuring the gas standing pressure (static)

The gas standing pressure must be stable to guarantee correct

operation of the boiler. The measurement is carried out when the boiler

is switched off.

▶ Switch off the appliance.

▶ Remove the front panel.

▶ Open the gas standing pressure 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.

▶ Measure the static gas standing pressure.

▶ Make a note of the value in the commissioning report ( § 15.7,

p. 50).

▶ Close the inlet pressure test port.

8.5 Measuring the gas working pressure (dynamic)

The gas working pressure must be stable to guarantee correct operation

of the boiler. The measurement is performed at full load.

As the measurement is taken at the air/gas ratio control valve and not the

gas valve, the permissible gas working pressure may be reduced due to

the pressure drop between the gas valve and air/gas ratio control valve.

Example: GC7000WP 100 to natural gas H, G20.

• Permissible gas pre-pressure: min. 17 mbar – max. 25 mbar (

Tab. 24, p. 48).

• Pressure drop between gas valve and air/gas ratio control valve is

2.7 mbar ( Tab. 10).

Permissible limit values on the air/gas ratio control valve:

Min. 17 mbar – 2.7 mbar = 14.3 mbar.

Max. 25 mbar – 2.7 mbar = 22.3 mbar.

Table 10 Pressure drop between gas valve and air/gas ratio control valve

▶ Calculate the permissible minimum and maximum gas pre-pressure.

▶ Switch off the appliance.

▶ Remove the front panel.

▶ Open the gas inlet pressure test port by turning the adjusting screw

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

▶ Set the pressure gauge to“0”.

▶ Connect the pressure gauge to the test port.

▶ Make sure the heating system can release its heat.

▶ Operate the appliance.

▶ Open the menu Function check > Burner.

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

▶ Check whether the measured value lies within the calculated limit

values.

If the measured value lies outside the calculated limit values, do not

commission the boiler. The cause must be established and the fault

rectified. If this is not possible, shut off the gas supply to the system and

contact the gas supplier.

▶ Make a note of the measured value [mBar] after 1 minute in the

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

▶Deactivate Function check.

▶ Close the working pressure test port.

0010034262-001

32 4 1

0010034263-001

32 4

Max. pressure drop for each gas type

[mbar]

Type G20 G25 / G25.3

GC7000WP 50 1.5 2.0

GC7000WP 65 2.5 2.8

GC7000WP 85 2.6 3.3

GC7000WP 100 2.7 3.7

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