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Ensure that all disturbed joints and connections are checked
for gas tightness on completion of tasks.
2.1.6
Checking the gas/air ratio and adjust as required
Turn mains power switch to "0" (fig. 51, item 1).
Remove the casing of the boiler.
Shut the gas shut off valve underneath the boiler (see
fig. 52, item 1).
Open at least two radiators.
Open the top measuring nipple (see fig. 54, item 1) with
two turns.
Set the pressure gauge to "0".
Connect a tube from the "+" side of the pressure gauge to
burner-pressure testing nipple (see fig. 54, item 2)
Open the gas shut off valve (see fig. 52, item 2).
Set the mains switch to "1" (fig. 51, item 1).
Set the boiler to partial load by pressing the service
button "A" once. A symbol of an open-end spanner "
appears in the upper left hand corner of the display
(see fig. 55).
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
fig. 53 Measuring the gas-supply pressure
fig. 54 Check the gas/air ratio
F
"
fig. 55 DBA with open-end spanner
Commissioning
Buderus • http://www.buderus-domestic.co.uk
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