Combustion Analysis - Ferroli PEGASUS LN 2S Serie Instructions D'utilisation, D'installation Et D'entretien

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
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Pilot burner assembly
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Cleaning the boiler and flue
For proper cleaning of the boiler (see fig. 11):
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cod. 3540T612 - Rev. 01 - 02/2015
PEGASUS LN 2S
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fig. 10 - Pilot burner
Combustion chamber door
Inspection door
Pilot burner
Ignition electrode
Detection electrode
Pilot nozzle
High voltage cable
Gas supply pipe
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.
fig. 11 - Boiler cleaning
Casing cover
Fume chamber closing plate
Flue brush
Combustion analysis plug
Insulation
3 ÷ 4 mm
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5
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