6 720 610 597 GB (03.02)
Converting the appliance to different gas types
35
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.
Conversion kits
• Instructions are sent with each conversion kit.
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 16, 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. 40.
B Insert testing probe about 135 mm into the flue gas
testing point and seal testing point.
Fig. 40
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. 42.
Fig. 41
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.
Model
For conversion
from ... Order no.
ZWBR 7-30 N.G to L.P.G 8 719 001 012
ZWBR 11-30 L.P.G to N.G 8 719 001 013
ZWBR 11-35 N.G to L.P.G 7 710 149 047
ZWBR 14-35 L.P.G to N.G 7 710 239 083
Table 14
6 7 2 0 6 1 0 3 3 2 - 5 7 . 2 R
2 3 4
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