LB 429 Blu 170 ÷ 350 P /P AB B
pag.21
MAINTENANCE
YEARLY CHECKS:
The periodical checks of the burner (combustion head, electrodes etc.) must be carried out by authorised
technicians once or twice in a year, according to burner’s duty conditions. Before going on with maintenance
operations, it is advisable to proceed through a control of the burner’s general state as follows:
- Unplug the burner from supply mains.
- Close the gas cock.
- Remove burner’s cover and clean fan and air intake’s duct.
- Clean the combustion head and check electrodes position.
- Reassemble the whole.
- Check fittings seal. - Check the chimney.
- Restart the burner and check combustion values
(CO2 = 9,7% (G 20); 11,7% (G 30); 11,7% (G 31); CO lower than 75 ppm).
Before any intervention verify that:
- The system is supplied with power and the burner is plugged in.
- Gas pressure is the correct one and the gas cock is open.
- The control devices are suitably connected.
- If all such a conditions are satisfied, start the burner by pressing the lockout rearm button and check
its ignition sequence.
SHORT TROUBLESHOOTING:
- The burner does not start:
check power switch, thermostats, motor, gas pressure, leakage control device (if any).
- The burner runs the pre-purging but switches to lockout at the end of cycle:
check air pressure, fan and air pressure switch.
- The burner runs the pre-purging but does not ignite:
check electrodes installation and position, ignition cable, ignition transformer, control box and gas
solenoid valves.
- The burner ignites but switches to lockout at the expiring of safety time:
check that phase and neutral are properly connected; check ionization probe’s position and
connection; check control box.
- The burner ignites properly but switches to lockout after few minutes of working:
check gas pressure governor and filter, gas pressure, detection value (1,5-3µA min.) and combustion
values.
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