Commissioning
2
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
37
Subject to modifications resulting from technical improvements!
Buderus • http://www.buderus-domestic.co.uk
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
z
Turn mains power switch to "
0
" (fig. 51, item 1).
z
Remove the casing of the boiler.
z
Shut the gas shut off valve underneath the boiler (see
fig. 52, item 1).
z
Open at least two radiators.
z
Open the top measuring nipple (see fig. 54, item 1) with
two turns.
z
Set the pressure gauge to "
0
".
z
Connect a tube from the "+" side of the pressure gauge to
burner-pressure testing nipple (see fig. 54, item 2)
z
Open the gas shut off valve (see fig. 52, item 2).
z
Set the mains switch to "
1
" (fig. 51, item 1).
z
Set the boiler to partial load by pressing the service
button "
A
" once. A symbol of an open-end spanner "
F
"
appears in the upper left hand corner of the display
(see fig. 55).
fig. 53 Measuring the gas-supply pressure
fig. 54 Check the gas/air ratio
fig. 55 DBA with open-end spanner
