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7 Unscrew the fastening screws "C" and remove the Venturi unit + gas valve
8 Unscrew the three fastening screws "D" and separate the gas valve and the Venturi
9 Replace the diaphragm "E", making sure the new restrictor and the gasket are repositioned correctly
inside the housing in the valve body
10 Reassemble the gas valve, ignition device, connections, following the previous instructions in the
reverse order
11 Check the seal of the gas connections
12 Insert the probe of a combustion analyzer in the outlet flue gas of the boiler
13 Turn on the boiler and bring the burner to the maximum power: it is advised to open one or more
DHW taps and verify on the display that the parameter 8 (boiler power) arrives to 99.
14 By means of the analyzer, note the CO
15 If necessary, slowly operate on the regulation screw F (fig.19) placed on the Venturi to bring the CO
content to the nominal value (within +/- 0.1%) expected in the table for the correspondent gas type.
It is recommended to operate only on the screw F and not on the gas valve: this operation could
compromise the correct functioning of the appliance
16 Once the regulation has been made, apply the orange plate contained in the transformation kit next
to the data plate and reassemble the boiler casing and the lower protection plate.
26
E
Fig. 20
content in the flue gas with boiler to maximum power
2
ARENA 30 A
2
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