Worcester GREENSTAR 29

6 720 611 137 GB (03.02)
Converting the appliance to different gas types
31
7.2 Testing combustion air/flue gas at set heat output
7.2.1 Testing the O
2
or CO
2
level in the combus-
tion 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. 47).
B Insert testing probe about 80 mm into the testing
point and seal testing point.
Fig. 47
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 boiler flow temperature.
7.2.2 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. 47).
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 boiler 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
or 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 7 2 0 6 1 0 3 3 2 - 6 5 . 2 R
2 3 4
2 3 4 . 1
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.