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Checks during operation
•
Make sure the fuel circuit and water systems are tight.
•
Check the efficiency of the flue and fume ducts while the boiler is working.
•
Make sure the water is circulating properly between the boiler and the systems.
•
Check correct lighting of the boiler, by turning it on and off several times.
•
Make sure the fuel consumption indicated on the meter matches that given in the
technical data table on cap. 5.3.
•
Check the correct delivery of domestic hot water with the t given in the technical
data table: do not trust measurements made with empirical systems. The measure-
ment should be made with specific instruments and as close as possible to the boil-
er, also considering the heat loss from the pipes.
4.3 Maintenance
B
The following operations must only be carried out by Qualified Personnel.
Seasonal inspection of the boiler and flue
It is advisable to have the following checks carried out at least once a year:
•
The control and safety devices (gas valve, thermostats, etc.) must function correctly.
•
The fume ducts must be clean and free of obstructions.
•
The gas and water systems must be tight.
•
The burner and exchanger must be clean. Follow the instructions in the next section.
•
The electrodes must be free of scale and properly positioned (see fig. 21).
•
The water pressure in the system when cold must be approx. 1 bar; otherwise bring
it to that value.
•
The expansion tank must be filled.
•
The gas flow and pressure must correspond to that given in the respective technical
data tables.
•
The circulating pumps must not be blocked.
Opening the front panel
To open the front panel, see the sequence in fig. 18.
B
Before carrying out any operation inside the boiler, disconnect the electrical
power supply and close the gas cock upstream.
fig. 18 - Front panel opening
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cod. 3540U174 - Rev. 04 - 11/2018
Cleaning the boiler and flue
To clean the boiler properly (fig. 19):
•
Close the gas cock ahead of the boiler and disconnect the electrical power.
•
Remove the front panel of the boiler.
•
Lift the casing cover by pressing upwards.
•
Remove the insulation placed over 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.
•
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 be careful not to damage the fume thermostat bulb at
the back of the fume chamber.
fig. 19 - Boiler cleaning
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Casing cover
2
Fume chamber closing plate
3
Flue brush
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 nut fixing the gas supply pipe ahead of the gas valve;
•
Undo the two nuts fixing the combustion chamber door to the cast iron elements of
the boiler (fig. 20)
•
Remove the burner assembly and combustion chamber door.
Then check and clean the main burners and pilot burner. Use a non-metal brush or com-
pressed air to clean the burners; never use chemical products.
fig. 20 - Removing the burners
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