PEGASUS F3 N 2S
35
EN
Pilot burner assembly
fig. 8 - 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. 9):
•
Turn off the gas ahead of the unit and disconnect the power
•
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 smoke chamber closing plate.
•
Remove the burner assembly (see next section).
•
Clean from the top downwards, using a flue brush. The same operation can be car-
ried out from the bottom upwards.
•
Clean the fume exhaust ducts between the cast iron elements of the boiler shell with
a vacuum cleaner.
•
Carefully refit all the previously removed parts and check the tightness of the gas
circuit and the combustion ducts.
•
During cleaning operations be careful not to damage the fume thermostat bulb fitted
in the back of the smoke chamber.
fig. 9 - Cleaning the boiler
1
Casing cover
2
Smoke chamber closing plate
3
Flue brush
4
Combustion analysis plug
5
Insulation
4.4 Troubleshooting
A
To avoid unnecessary expense, before calling the After-Sales Service make
sure the boiler has not stopped due to no power or gas.
3
3 ÷ 4 mm
5
4
8
Fault
Cure
After several lighting attempts , the
electronic controller shuts down the
boiler.
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
fig. 8).
Make sure the boiler is connected to an efficient earth connection.
Check the connections to the ignition and ionisation electrodes.
The electrodes are not discharging
in the ignition phase.
Make sure the electrodes are correctly positioned and free of deposits (see
fig. 8).
Control thermostat adjusted too low.
Check the power supply.
Check the connections to the ignition and ionisation electrodes.
Check the connections to the electronic flame controller.
Make sure the LINE -NEUTRAL are not inverted and that the earth contacts are
efficient.
Check the inlet gas pressure and any open gas pressure switches.
Reset the safety thermostat.
Make sure the room thermostat is closed.
The burner burns poorly: flames too
high, too low or too yellow
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.
Smell of unburnt gas
Make sure the boiler is clean.
Check the flue draught.
Make sure gas consumption is not excessive.
The boiler works but the tempera-
ture fails to increase
Check correct operation of the 2-stage control thermostat.
Make sure the gas valve 2nd stage operator (max. power) is fed.
Make sure 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 the water to system
too high or too low
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.
Explosion at burner. Ignition delays Make sure the gas pressure is sufficient and that the boiler casing is not dirty.
The control thermostat switches
back on with too great a tempera-
ture difference
Make sure the bulb is properly inserted in the sheath.
Check correct operation of the 2-stage thermostat.
The boiler produces condensation
water
Make sure the boiler is not operating at too low temperatures (below 50°C).
Make sure gas consumption is regular.
Check the efficiency of the flue.
The boiler goes out for no apparent
reason
Safety thermostat activation due to an overtemperature.
1
5
3
4
2
cod. 3540T624 - Rev. 01 - 04/2018
