Technical data

Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006 37
Subject to modifications resulting from technical improvements! Buderus • http://www.buderus-domestic.co.uk
Commissioning 2
2.2.8 Check the gas/air ratio and adjust as required
z Turn power switch (fig. 32, item 2) and chimney
sweep switch (fig. 32, item 4) to “0”.
z Unscrew the sealing closure of the burner-pressure
testing nipple by one turn (fig. 33).
z Connect the positive port of the pressure gauge with
a hose to the burner pressure measuring nipple
(fig. 33).
z Zero the pressure gauge.
z Make sure that the system pump is running.
z Turn power switch to “I” and chimney sweep switch
to “1”.
z If the burner has fired after approx. 30 seconds, keep
the service button (fig. 32, item 3) pressed until “Y”
appears on the display.
z Turn the hot-water temperature controller (fig. 32,
item 1) to “1”.
z Read the differential pressure.
The differential pressure (p
GAS
–p
AIR
) should total
-5 Pa to 5 Pa (-0.05 mbar – 0.05 mbar) (display on
measuring gauge: -10 Pa to 0 Pa).
z If the gas/air ratio does not conform to specifications,
re-adjust at the setscrew (fig. 33, item 1).
z Turn power switch and chimney sweep switch to “0”.
z Remove the measuring equipment and retighten the
screw in the burner-pressure measuring nipple.
z Re-adjust the hot water temperature controller to its
original setting.
z Turn the power switch to “I”.
2.2.9 Record readings
z 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
Fig. 32 Power switch, service button and chimney sweep
switch
12
10
01
11
KW
10
1
1
1
3
4
2
Fig. 33 Check the gas/air ratio
Fig. 34 Measuring points on exhaust conduit
Key to fig. 34:
item 1: Exhaust-fume temperature, CO
2
, CO, NO
x
1
CAUTION!
CAUTION
The carbon monoxide values under
vacuum must be smaller than 400 ppm or
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.