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▶ Undo the test nipple for the gas supply pressure [1] by turning it
through 2 revolutions.
Fig. 65 Open the burner pressure nipple at the 50-V2 and 65-V2
1
Fig. 66 Open the burner pressure nipple at the 85-V2 and 100-V2
▶ 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].
1
Fig. 67 Connecting the pressure gauge at 50-V2 and 65-V2
6720814332 (2018/04)
1
Fig. 68 Connecting the pressure gauge at the 85-V2 and 100-V2
▶ Open the gas isolation valve.
▶ Bring the boiler into operation.
6 720 807 034-61.1DDC
▶ Make sure that the boiler can dissipate the heat generated.
▶ Start the chimney sweep 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. 6, page 10).
▶ Take the boiler out of operation.
▶ Close the gas isolation valve.
▶ Remove the pressure gauge.
6 720 807 034-024.1DDC
▶ Close test nipple for gas supply pressure.
▶ Open the gas isolation valve.
▶ Bring the boiler into operation.
▶ Check gas tightness of the boiler.
8.8
▶ Take the boiler out of operation.
▶ Close the gas isolation valve.
▶ Undo the nozzle pressure test nipple [1] by turning it through
2 revolutions.
6 720 807 034-62.1DDC
Fig. 69 Open the burner pressure nipple at the 50-V2 and 65-V2
1
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.
Measure gas/air ratio
NOTICE: Damage to the 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.
Commissioning
6 720 807 034-025.1DDC
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6 720 807 034-67.1DDC
33
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