Riello DB 4 SM BLU Installation, Use And Maintenance Instructions page 36

5.7 Flame present check
The burner is fitted with an ionisation system which
ensures that a flame is present. The minimum cur-
rent for plant operation is 6 µA. The burner provides
a much higher current, so that controls are not nor-
mally required. However, if it is necessary to meas-
ure the ionisation current, disconnect the plug-
socket on the ionisation probe cable and insert a
direct current microamperometer with a base scale
of 100 µA. Carefully check polarities!
5.8 Periodic checks
We recommend carrying out the following checks:
LIST OF MONTHLY CHECKS
1 Inspect the flame detection device and check it is undamaged and clean.
2 Check the ignition device and clean if necessary.
3 Check the right pressure levels for fuel and air.
4 Check the correct movement and setting of the air damper and relative lifting assemblies.
5 Check the start up sequence and the safety interlocks, by simulating the relative anomaly situation.
LIST OF YEARLY CHECKS
1 Check the fuel blocking valves are still well sealed.
2 Check the settings on the pressure switches.
3 Visual check of the wires and connectors.
4 Check and clean the pressure test points.
5 Check the installation pipes for leaks.
6 Visual check of any damage and/or deformation of the following components:
- cylinder/distributor unit;
- flame disc;
- ignition unit;
- flame pipes.
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5
CHAPTER Preparation for start up
A
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D3097
Fig. 23