Measure Gas/Air Ratio - Bosch Condens 5000W Installation And Maintenance Instructions Manual

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Fig. 43 Open the burner pressure nipple at the type 100
▶ Set the pressure gauge to "0".
▶ Connect test hose to the plus connector of pressure gauge and the
test nipple for the gas supply pressure [1].
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Fig. 44 Connecting the pressure gauge at type 70
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Fig. 45 Connecting the pressure gauge at type 100
▶ Open gas isolation valve.
▶ Bring wall mounted gas condensing boiler into operation.
▶ Make sure that the wall mounted gas condensing boiler can release its
heat.
▶ Start the flue gas inspector mode ( Chapter 7.3).
▶ Set the output to 100%.
▶ Measure the gas supply pressure.
▶ Enter value in maintenance protocol.
▶ Check that the measured value is not less than the permissible value
( tab. 3, page 3).
Condens 5000W – 6720813952 (2019/02)
Never commission the appliance above or below these values. The cause
must be established without fail and the fault rectified. If this is not
possible, shut off the gas supply and contact the gas supplier.
▶ Take the wall mounted gas condensing boiler out of operation.
▶ Close gas isolation valve.
▶ Remove the pressure gauge.
▶ Close test nipple for gas supply pressure.
▶ Open gas isolation valve.
▶ Bring wall mounted gas condensing boiler into operation.
▶ Check gas tightness of wall mounted gas condensing boiler.
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8.8

Measure gas/air ratio

NOTICE:
Damage to wall mounted gas condensing boiler due to incorrect
setting.
The gas valve is exceptionally reliable and therefore requires no
adjustment:
▶ Only the gas/air ratio may be measured.
▶ If the measurement is out of spec, the gas valve must be replaced.
▶ Take the wall mounted gas condensing boiler out of operation.
▶ Close gas isolation valve.
▶ Undo the nozzle pressure test nipple [1] by turning it through
2 revolutions.
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Fig. 46 Open the burner pressure nipple at the type 70
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Fig. 47 Open the burner pressure nipple at the type 100
▶ Connect pressure gauge.
▶ Set pressure gauge to "0".
Hold the pressure gauge at the same height when the measurement
is in progress.
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Commissioning
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