6 720 611 447 GB (03.11)
Converting the appliance to different gas types
33
8 Converting the appliance to different gas types
The setting is factory sealed at maximum. Adjustment to
the rated heat input and min. heat input is not neces-
sary.
Checking the gas supply pressure
B Check the gas supply pressure at the gas supply
pressure testing point.
Natural gas
•Appliances for natural gas type G20 are factory set
to Wobbe-Index 15 kWh/m
3
and 20 mbar supply
pressure and sealed.
8.1 Setting the gas/air ratio
The gas/air ratio may only be adjusted on the
basis of a CO
2
measurement at max. heat output
and min. heat output using an electronic tester.
B Switch off the appliance at the master switch (O).
B Remove the outer case (see page 14, refer to
fig. 13).
B Switch on the appliance at the master switch (I).
B Unscrew sealing plug from flue gas testing
point (234). Refer to fig. 42.
B Insert testing probe about 135 mm into the flue gas
testing point and seal testing point.
Fig. 42
B On the text display unit, select in the main menu Set-
tings, Service, Display service parameters.
B Press and hold the button (for about 5 sec-
onds) until the display shows Adjust service
parameters and the first service function to be set,
2.0 Operating mode. If a fault has occurred, the
display will show 0.0 and the last fault.
B Press or until the display shows 2.0
Operating mode normal.
B Press the button.
B Press or to select Max.
B Measure the CO
2
level.
B Prise off the seal on the gas flow restrictor.
B Adjust the gas flow restrictor (63) to obtain the CO
2
level given in Table 15. Refer to fig. 43
i
Natural gas appliances must not be oper-
ated if the gas supply pressure is below
18 mbar or above 24 mbar.
LPG appliances must not be operated if
the supply pressure is below or above
37 mbar.
6 720 610 599 - 01.TD
234
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