Riello DB 3 LSM C13 Installation, Use And Maintenance Instructions page 54

7
Maintenance
7.1 Checking the flame detector
UV sensor
Minimum current for correct working is 70 µA.
If the value is lower, it could be due to:
• exhausted sensor;
• low current (lower than 187 V);
• bad regulation of the burner.
In order to measure the current, use a microamme-
ter of 100 A c.c., connected in series to the photo-
cell, as in the scheme, with a capacitor of 100 F - 1V c.c. at the same level of the instrument.
7.2 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.
Fig. 31
D1143
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