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Commissioning
2.1.7
Checking the gas/air ratio and adjust as required
Turn mains power switch to "0" (fig. 49, item 1).
Remove the casing of the boiler.
Shut the gas shut off valve underneath the boiler
(see fig. 50, item 1).
Open at least two radiators.
Open the top measuring nipple (see fig. 52, 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. 52, item 2)
Open the gas shut off valve (see fig. 50, item 2).
Set the mains switch to "1" (fig. 49, 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. 53).
The optimum gas/air ratio is - 5 Pa (-0.05 mbar).
The pressure difference should be between -10 and 0 Pa
(see fig. 54).
If this is not the case then adjustment is needed:
Remove the safety screw with a flat head screwdriver
(fig. 55, item 1).
Adjust the adjustment screw of the burner pressure to the
correct gas/air ratio using a (4 mm) socket head wrench
and by referring to fig. 54.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for Buderus 500 - 24/C and 500 - 28/C • 02/2005
fig. 52 Check the gas/air ratio
F
"
fig. 53 DBA with open-end spanner
-15
-0.15
fig. 54 Pressure difference of gas/air ratio at partial load
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
wrong
correct
wrong
-10
-5
0
-0.10
-0.05
0.00
left turn
right turn
2
5 (Pa)
0.05 (mbar)
37
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