Ferroli PEGASUS 119 LN 2S Instrucciones De Uso página 32

Combustion analysis
A fume sampling point has been included in the upper part of the anti-backflow device
inside the boiler (see fig. 8).
To take the sample:
1. Remove the top panel of the boiler
2. Remove the insulation covering the anti-backflow device
3. Open the fume sampling point;
4. Insert the probe;
5. Adjust the boiler temperature to maximum.
6. Wait 10-15 minutes for the boiler to stabilise*
7. Take the measurement.
fig. 8 - Combustion analysis
Analyses made with a non-stabilised boiler can cause measurement errors.
A
Removing and cleaning the burner assembly
To remove the burner assembly:
• Disconnect the electrical power supply and turn off the gas ahead of the boiler.
• Undo the two screws securing the electronic flame controllers to the gas valve (de-
tail A - fig. 9) and remove them from the gas valves (detail B - fig. 9).
• Undo the screws fixing the connectors to the gas valves and remove them.
• Disconnect the ignition and ionisation cables from the electrode assembly.
• Undo the nuts fixing the gas supply pipe ahead of the gas valves (detail C - fig. 9).
• Undo the two nuts fixing the combustion chamber door to the cast iron elements of
the boiler (detail D - fig. 9).
• Remove the burner assembly and combustion chamber door.
Check and clean the burners. Only use a non-metallic brush or compressed air to clean
the burners; never use chemical products.
Afterwards, refit everything in reverse order to removal.
fig. 9 - Burner removal and cleaning
32
EN
Pilot burner assembly
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. 11):
• Close the gas cock ahead of the boiler and disconnect the power supply
• Remove the front panel of the boiler (fig. 7).
• Lift the casing cover by pressing upwards.
• Remove the insulation 5 covering the anti-backflow device.
• Remove the fume 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 evacuation 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 take care not to damage the fume thermostat bulb at the
back of the fume chamber.
1 Casing cover
2 Fume chamber closing plate
3 Flue brush
4 Combustion analysis plug
5 Insulation
cod. 3540T612 - Rev. 01 - 02/2015
PEGASUS LN 2S
3 ÷ 4 mm
3
4
5
8
fig. 10 - Pilot burner
fig. 11 - Boiler cleaning
1
5
2
4
3