17
CHAPTER
5
Preparation for start up
5.6
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!
5.7
Periodic checks
We recommend carrying out the following checks:
LIST OF MONTHLY CHECKS
1
Verify the ionisation probe and possibly clean it.
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.
D3097
Fig. 23
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+
A
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