PEGASUS LN 2S
32
EN
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
A
Analyses made with a non-stabilised boiler can cause measurement errors.
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
Pilot burner assembly
fig. 10 - 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. 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.
fig. 11 - Boiler cleaning
1
Casing cover
2
Fume chamber closing plate
3
Flue brush
4
Combustion analysis plug
5
Insulation
3
3 ÷ 4 mm
5
4
8
3
2
1
4
5
cod. 3540T612 - Rev. 01 - 02/2015
