Ferroli PEGASUS 2S Série Mode D'emploi page 33

PEGASUS 67 ÷ 107 2S
Cleaning the boiler and flue
For proper cleaning of the boiler (see fig. 10):
• 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. 10 - Boiler cleaning
1 Casing cover
2 Fume chamber closing plate
3 Flue brush
4 Combustion analysis plug
5 Insulation
4.4 Troubleshooting
Fault
After several lighting attempts, the
electronic controller shuts down the
boiler.
The electrodes are not discharging
in the ignition phase.
1
5
2
The burner burns poorly: flames
too high, too low or too yellow
4
3
Smell of unburnt gas
The boiler works but the tempera-
ture does not increase
Temperature of water to the system
too high or too low
Explosion at burner. Delay on igni-
tion
The control thermostat is reacti-
vated with too great a temperature
difference
The boiler produces condensate
The boiler shuts down for no appar-
ent reason
To avoid unnecessary expense, before calling the After-Sales Service make
A
sure the boiler has not stopped due to no electricity or gas.
cod. 3540S434 - Rev. 00 - 10/2020
Cause / Cure
Clean the pilot burner nozzles with compressed air.
Check the regular gas flow to the boiler and that the air has been eliminated
from the pipes.
Make sure the electrodes are correctly positioned and free of deposits (see ).
Make sure the boiler is connected to an efficient earth connection.
Check the connections at the ignition and ionisation electrodes.
Make sure the electrodes are correctly positioned and free of deposits (see ).
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.
Gas valve filter dirty.
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.
Make sure the boiler is clean.
Check the flue draught.
Check that gas consumption is not excessive.
Check correct operation of the 2-stage control thermostat.
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.
Check correct operation of the 2-stage control thermostat.
Make sure the heating pump is not blocked.
Make sure the characteristics of the circulating pump are adequate for the sys-
tem.
Make sure the gas pressure is sufficient and that the boiler shell is not dirty.
Make sure the bulb is properly inserted in the sheath.
Check operation of the 2-stage thermostat .
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.
Safety thermostat activation due to an overtemperature.
Fume thermostat activation.
EN
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