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Initial start-up
2.1.8
Checking the gas/air ratio and adjust as required
Turn mains power switch "0" and make sure that the boiler
is not in chimney sweep mode.
Remove the casing of the boiler.
Shut the gas shutoff valve underneath the boiler (see
fig. 42, item 1).
Open at least two radiators.
Open the top measuring nipple (see fig. 44, 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. 44, item 2)
Open the gas shutoff valve (see fig. 42, item 2).
Set the mains switch to "1".
Set the boiler in service mode by pressing the chimney
sweep button until a non-blinking LED appears in the lower
right hand corner of the display.
Press the chimney sweep button and the service button at
the same time, until "L--" appears in the display.
Adjust the capacity to "L25" by pressing the reset button.
The optimum gas/air ratio is - 5 Pa (-0.05 mbar).
The pressure difference should be between -10 and 0 Pa
(see fig. 45).
If this is not the case then adjustment is needed:
Remove the safety screw with a flat head screwdriver
(fig. 46, 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. 45.
Replace the safety screw.
Set mains power switch to "0".
Shut the gas shutoff valve (see fig. 42, item 1).
Remove the tube from from the burner-pressure testing
nipple.
Tighten the screw on the burner-pressure testing nipple.
Open the gas shutoff valve (see fig. 42, item 2).
Turn the mains power switch to "1".
Set the boiler in service mode by pressing the chimney
sweep button, until a non-blinking LED appears in the
lower right hand corner of the display.
Check the testing nipples for gas tightness.
Turn off the boiler again by pressing the mains power
switch to "0".
Turn the boiler on by setting the mains power switch to "1".
CAUTION
Check the test nipples for gas tightness.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
fig. 44 Check the gas/air ratio
wrong
correct
-15
-10
-0.15
-0.10
-0.05
leftturn
fig. 45 Pressure difference at gas/air at "L25"
fig. 46 Idjust gas/air ratio
Boulter Buderus Ltd. • http://www.boulter-boilers.com
wrong
-5
0
5 (Pa)
0.00
0.05 (mbar)
rightturn
2
29
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