Buderus 600 - 11R Installation And Servicing Instructions page 37

2.2.8 Check the gas/air ratio and adjust as required
Turn power switch (fig. 32, item 2) and chimney
sweep switch (fig. 32, item 4) to "0".
Unscrew the sealing closure of the burner-pressure
testing nipple by one turn (fig. 33).
Connect the positive port of the pressure gauge with
a hose to the burner pressure measuring nipple
(fig. 33).
Zero the pressure gauge.
Make sure that the system pump is running.
Turn power switch to "I" and chimney sweep switch
to "1".
If the burner has fired after approx. 30 seconds, keep
the service button (fig. 32, item 3) pressed until "Y"
appears on the display.
Turn the hot-water temperature controller (fig. 32,
item 1) to "1".
Read the differential pressure.
The differential pressure (p
-5 Pa to 5 Pa (-0.05 mbar – 0.05 mbar) (display on
measuring gauge: -10 Pa to 0 Pa).
If the gas/air ratio does not conform to specifications,
re-adjust at the setscrew (fig. 33, item 1).
Turn power switch and chimney sweep switch to "0".
Remove the measuring equipment and retighten the
screw in the burner-pressure measuring nipple.
Re-adjust the hot water temperature controller to its
original setting.
Turn the power switch to "I".
2.2.9 Record readings
Unscrew the corresponding sealing closure (fig. 34)
on the connection adapter for the combustion-
air/flue-gas system and replace it once the meas-
uring operation in question has been carried out.
Carbon monoxide content
CAUTION
The carbon monoxide values under
vacuum must be smaller than 400 ppm or
CAUTION!
0.04 Vol%. Values around or exceeding
400 ppm indicate a faulty burner
adjustment, a dirty gas burner or heat
exchanger, or a defective burner. Ensure
that the cause of the fault is remedied
immediately.
Subject to modifications resulting from technical improvements!
Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
– p ) should total
GAS AIR
2
Fig. 32 Power switch, service button and chimney sweep
switch
Fig. 33 Check the gas/air ratio
Fig. 34 Measuring points on exhaust conduit
Key to fig. 34:
item 1: Exhaust-fume temperature, CO
Buderus • http://www.buderus-domestic.co.uk
Commissioning
3
11
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1 2
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37