Testing Combustion Air/Flue Gas At Set Heat Output - Worcester ZWBR 7-30 R 30 HE plus Installation And Servicing Instructions

Converting the appliance to different gas types
8.2

Testing combustion air/flue gas at set heat output

8.2.1 Testing the O
2
combustion air
By testing the O
i
bustion air the gas tightness of a type C
C flue system can be checked. The
33
O level must not be less than 20,6 %.
2
The CO level must not exceed 0,2 %.
2
B Press and hold the
shows – –.
"Chimney sweep" mode is now active.
The button will light up and the display shows the
CH flow temperature.
In "chimney sweep" mode, the appliance
i
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.
B Remove sealing plug from combustion air testing
point (234.1, fig. 43).
B Insert testing probe about 80 mm into the testing
point and seal testing point.
234.1
234
Fig. 43
B Measure O
and CO
2 2
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.
34
or CO level in the
2
or CO level in the com-
2 2
13
button until the display
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levels.
8.2.2 Testing CO and CO
B Press and hold the
shows – –.
, "Chimney sweep" mode is now active.
The button will light up and the display shows the
CH flow temperature.
You have 15 minutes in which to measure
i
the levels. After that, the appliance switch-
es back from "chimney sweep" mode to
normal mode.
B Remove sealing plug from flue gas testing point
(234, fig. 43).
B Insert testing probe about 135 mm into the testing
point and seal testing point.
B CO- and CO
B Refit sealing plug.
B Press and hold
The button will stop flashing and the display
shows the CH flow temperature.
2
button until the display
levels.
2
button until the display shows – –.
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