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Converting the appliance to different gas types
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.
The gas/air ratio may only be adjusted on the
basis of a CO
measurement at max. heat output
2
and min. heat output using an electronic tester.
Checking the gas supply pressure
y Check the gas supply pressure at the gas supply
pressure testing point.
Natural gas appliances must not be oper-
i
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 not 37 mbar.
Natural gas
• Appliances for natural gas type G20 are factory set
to Wobbe-Index 15 kWh/m
pressure and sealed.
Conversion kits
For conversion
Model
from ...
ZWBR 7-28
N.G to L.P.G
ZWBR 11-28
L.P.G to N.G
ZWBR 11-35
N.G to L.P.G
ZWBR 14-35
L.P.G to N.G
Table 14
• Instructions are sent with each conversion kit.
34
3
and 20 mbar supply
Order no.
7 710 149 046
7 710 239 082
7 710 149 047
7 710 239 083
8.1
Setting the gas/air ratio
y Switch off the appliance at the master switch (O).
y Remove the outer case (see page 15, fig. 12).
y Switch on the appliance at the master switch (I).
y Unscrew sealing plug from flue gas testing
point (234). Refer to fig. 39.
y Insert testing probe about 135 mm into the flue gas
testing point and seal testing point.
Fig. 39
y On the text display unit, select in the main menu Set-
tings, Service, Display service parameters.
y Press and hold the
onds) until the display shows Adjust service
parameters and the first service function to be set,
2.0, Operating mode.
y Select operating mode Max.
y Measure the CO
level.
2
y Prise off the seal on the gas flow restrictor.
y Adjust the gas flow restrictor (63) to obtain the CO
level given in Table 15. Refer to fig. 41.
Fig. 40
button (for about 5 sec-
6 720 610 597 GB (01.07)
2
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