Ferroli PEGASUS 67 2S Instructions D'utilisation, D'installation Et D'entretien page 30

Pilot burner assembly
3
5
8
fig. 11 - Pilot burner
1 Combustion chamber door
2 Inspection door
3 Pilot burner
4 Ignition electrode
5 Detection electrode
6 Pilot nozzle
7 High voltage cable
8 Gas supply pipe
Cleaning the boiler and flue
For proper cleaning of the boiler (see fig. 12):
• Turn off the gas ahead of the unit and disconnect the power supply
• Remove the front panel of the boiler (fig. 5).
• Lift the casing cover by pressing upwards.
• Remove the insulation 5 covering the anti-backflow device.
• Remove the fume chamber closing plate and insulation.
• Remove the burner assembly (see previous par.)
• Clean from the top downwards, using a flue brush. The same operation can be car-
ried out from the bottom upwards.
• Clean the fume evacuation ducts between the cast iron elements of the boiler shell
with an aspirator.
• Carefully refit all the previously removed parts and check the tightness of the gas
circuit and the combustion ducts.
• During cleaning be careful not to damage the bulb of the fume thermostat fitted on
the back of the fume chamber.
fig. 12 - Boiler cleaning
1 Casing cover
2 Fume chamber closing plate
3 Flue brush
4 Combustion analysis plug
5 Insulation
30 EN
3 ÷ 4 mm
4
1
5
2
4
3
cod. 3540S433 - Rev. 02 - 04/2018
PEGASUS 67 ÷ 107 2S
4.4 Troubleshooting
Fault Cause / Cure
After several lighting attempts, the Clean the pilot burner nozzles with compressed air.
electronic controller shuts down the
Check the regular gas flow to the boiler and that the air has been eliminated
boiler.
from the pipes.
Make sure the electrodes are correctly positioned and free of deposits (see
fig. 11).
Make sure the boiler is connected to an efficient earth connection.
Check the connections at the ignition and ionisation electrodes.
The electrodes are not discharging Make sure the electrodes are correctly positioned and free of deposits (see
in the ignition phase. fig. 11).
Control thermostat adjusted too low.
Check the power supply.
Check the connections at the ignition and ionisation electrodes.
Check the connections at the electronic flame controller.
Make sure LINE-NEUTRAL are not inverted and that the earth contacts are effi-
cient.
Check the inlet gas pressure and any open pressure switches.
Reset the safety thermostat.
Reset the fume thermostat.
Make sure the room thermostat is closed.
The burner burns poorly: flames Gas valve filter dirty.
too high, too low or too yellow
Check the gas supply pressure.
Gas nozzles dirty.
Make sure the boiler is not dirty.
Make sure the ventilation in the room where the unit is located is sufficient for
proper combustion.
Smell of unburnt gas Make sure the boiler is clean.
Check the flue draught.
Check that gas consumption is not excessive.
The boiler works but the tempera- Check correct operation of the 2-stage control thermostat.
ture does not increase
Make sure the gas valve 2nd stage operator (max. power) is fed.
Check that gas consumption is not less than that provided for.
Make sure the boiler is perfectly clean.
Make sure the boiler is adequate for the system.
Make sure the heating pump is not blocked.
Temperature of water to the system Check correct operation of the 2-stage control thermostat.
too high or too low
Make sure the heating pump is not blocked.
Make sure the characteristics of the circulating pump are adequate for the sys-
tem.
Explosion at burner. Delay on igni- Make sure the gas pressure is sufficient and that the boiler shell is not dirty.
tion
The control thermostat is reacti- Make sure the bulb is properly inserted in the sheath.
vated with too great a temperature
Check operation of the 2-stage thermostat .
difference
The boiler produces condensate Make sure the boiler is not operating at too low a temperature (below 50°C).
Check regular gas consumption.
Check the efficiency of the flue.
The boiler shuts down for no appar- Safety thermostat activation due to an overtemperature.
ent reason
Fume thermostat activation.
A
To avoid unnecessary expense, before calling the After-Sales Service make
sure the boiler has not stopped due to no electricity or gas.