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20 | Maintenance
Open the hot water tap.
Using the adjuster screw (Fig. 19, [2]) regulate the
pressure to the values indicated in table 15.
8.3 Changing gas type
Use only authentic conversion kits. Conversion must only be
carried out by an accredited technician. Authentic conversion
kits are supplied with installation instructions.
Close the gas valve.
Disconnect the main switch and remove the front cover.
Dismantle the burner.
Fig. 20
Dismantle both injectors groups and replace them.
Reassemble the burner.
Ensure there are no gas leaks.
Open electronic cover.
Set the jumper settings according to Fig. 21.
Fig. 21 Jumper (natural gas configuration)
Register the gas type modification on the characteristics
panel of the appliance.
9Maintenance
To minimise gas consumption and emissions, we recommend
that the appliance is checked, and possibly maintained,
annually.
Your appliance must only be serviced by a BOSCH
Technical Assistance delegate.
Natural gas H Butane Propane
Injector code WT11 8708202116
(1,25)
8708202129
(0,71)
Connection
pressure
(mbar)
WT11 20 28-30 37
Burner
pressure MAX
(mbar)
WT11 10 26 34
Burner
pressure min
(mbar)
WT11 13,6
Table 15 Burner pressure
DANGER:
Through electric shock!
Isolate the appliance from the power
supply (e.g. fuse, circuit breaker) before
carrying out any work on electrical parts.
WARNING:
Prior to commencing maintenance work:
Isolate the appliance from the power
supply.
Close the water shut-off valve.
Close the gas tap.
6720607047-05.2V
20


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