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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.
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 ...
ZB 7-27 HE
N.G to L.P.G
ZB 11-27 HE
L.P.G to N.G
Table 12
• Instructions are sent with each conversion kit.
6 720 610 596 GB (01.07)
3
and 20 mbar supply
Order no.
7 710 149 045
7 710 239 081
Converting the appliance to different gas types
7.1
Setting the gas/air ratio
y Switch off the appliance at the master switch (O).
y Remove the outer case (see page 14, refer to
fig. 12).
y Switch on the appliance at the master switch (I).
y Set room thermostat to maximum temperature.
y Open thermostatic radiator valves.
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 Press and hold
button until the display shows – –.
The
button will light up.
6 720 610 332-32.1O
Fig. 40
y Turn the temperature control
shows 2.0 .
After a short delay, the current operating mode set-
ting will be displayed ( (0. = Normal mode).
6 720 610 332-60.1O
Fig. 41
until the display
29
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