Gas Type Changeover - MBM GF4772V Instructions Pour L'installation

6.

GAS TYPE CHANGEOVER

6.1 UPSTREAM DYNAMIC PRESSURE CONTROL
Check the pressure by referring to the procedure described in par. 5.3
6.2 INJECTOR PRESSURE CONTROL
The pressure is measured with a 0 ÷ 80 mbar pressure measurer.
The pressure intake is placed usually above the nozzle holder,
• Close the cut-off cock upstream the machine (Fig. 1);
• unscrew the pressure intake screw (Fig. 4);
• place the instrument for the detection (pressure measurer);
• Open the cut-off cock upstream the equipment (Fig. 2);
• turn on the burners at the maximum power and detect the pressure
read by the instrumen
Once the read-out is finished:
• Close the cut-off cock upstream the machine(Fig. 1).
• Reassemble the screw with gas seal washer in the appropriate seat,
open the cut-off cock upstream the machine (Fig. 2) and check by turn-
ing the burner on, that there are no gas leakages.
If the measured pressure is lower than the 20% compared to
the entry pressure, suspend the installation and contact the
authorized customer care service
If the measured pressure is higher than the entry pressure,
suspend the installation and contact the authorized customer
care service
6.3 REPLACEMENT OF PILOT BURNER INJECTOR
•
Close the cut-off cock upstream the machine.
•
Demount if necessary, the plugs in order to avoid to damage it during the
injector replacement (Fig. 2).
• Unscrew the nut and demount the pilot injector (the injector is hooked to
the compression fitting).
• Replace the pilot injector (Fig. 1) with the one corresponding to the se-
lected gas according to what reported in the reference Table (see Gas
reference Table).
• Screw the nut with the new injector.
• Reassemble the plug.
• Turn on the pilot burner to check whether there are no gas leakages.
Make sure there are no gas leaks
THE PRESENT MANUAL IS PROPERT Y OF THE MANUFACTURER. ANY REPRODUCTION, EVEN PARTIAL, IS PROHIBITED.
Fig. 1
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Fig. 3
Fig. 1 Fig. 2
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Fig. 4
Fig. 2
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Fig. 4