6 720 610 576 GB (03.02)
30
Converting the appliance to different gas types
7 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.
7.1 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, 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. 41.
B Insert testing probe about 135 mm into the flue gas
testing point and seal testing point.
Fig. 41
B Press and hold button until the display shows – –.
The button will light up.
Fig. 42
B Turn the temperature control until the display
shows 2.0 .
After a short delay, the current operating mode set-
ting will be displayed (0. = Normal mode).
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.
Model
For conversion
from ... Order no.
ZWB 7-25
HE combi
N.G to L.P.G 7 710 149 044
ZWB 11-25
HE combi
L.P.G to N.G 7 710 239 080
ZWB 7-30
HE combi
N.G to L.P.G 7 710 149 048
ZWB 11-30
HE combi
L.P.G to N.G 7 710 239 084
Table 15
6 7 2 0 6 1 0 3 3 2 - 5 7 . 2 R
2 3 4
6 720 610 332-32.1O
6 720 610 332-60.1O
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