Technical data

6 720 611 447 GB (03.11)
Converting the appliance to different gas types
35
8.2 Testing combustion air/flue gas at set heat output
8.2.1 Testing the O
2
or CO
2
level in the
combustion air
B Press and hold the button until the display
shows ––.
“Chimney sweep” mode is now active.
The button will light up and the display shows the
CH flow temperature.
B Remove sealing plug from combustion air testing
point (234.1, fig. 45).
B Insert testing probe about 80 mm into the testing
point and seal testing point.
Fig. 45
B Measure O
2
and CO
2
levels.
B Refit sealing plug.
B Press and hold button until the display shows ––.
The button will stop flashing and the display
shows the CH flow temperature.
8.2.2 Testing CO and CO
2
B Press and hold the button until the display
shows ––.
“Chimney sweep” mode is now active.
The button will light up and the display shows the
CH flow temperature.
B Remove sealing plug from flue gas testing point
(234, fig. 45).
B Insert testing probe about 135 mm into the testing
point and seal testing point.
B CO- and CO
2
levels.
B Refit sealing plug.
B Press and hold button until the display shows ––.
The button will stop flashing and the display
shows the CH flow temperature.
i
By testing the O
2
or CO
2
level in the com-
bustion air the gas tightness of a type C
13
,
C
33
flue system can be checked. The
O
2
level must not be less than 20,6 %.
The CO
2
level must not exceed 0,2 %.
i
In “chimney sweep” mode, the appliance
switches to max. rated heat output or the
set heating output. You then have 15 min-
utes in which to measure the levels. After
that, the appliance switches back from
“chimney sweep” mode to normal mode.
6 720 610 599 - 01.TD
234.1
234
i
You have 15 minutes in which to measure
the levels. After that, the appliance switch-
es back from “chimney sweep” mode to
normal mode.