EXTREMA
24
EN
cod. 3540S060 - 04/2010 (Rev. 00)
3.4 Routine servicing, maintenance & repair
General
PLEASE NOTE:
During routine servicing, and after any maintenance or change of part of the combustion circuit, we
recommend that the following is checked:
•
The integrity of the flue system and the flue seals;
•
The integrity of the boiler combustion circuit and the relevant seals;
•
The operational (working) gas inlet pressure at maximum rate, as described in cap. 4.4;
•
The gas rate, as described in cap. 4.4;
•
The combustion performance, as described in sec. Combustion check of cap. 3.4
Competence to carry out the check of combustion performance
PLEASE NOTE:
BS 6798: 2009
Specification for installation and maintenance of gas-fired boilers of rated input
not exceeding 70 kW net
advises that:
•
The person carrying out a combustion measurement should have been assessed as competent in the use of a flue
gas analyser and the interpretation of the results;
•
The flue gas analyser used should be one meeting the requirements of BS7927 or BS-EN50379-3 and be calibrated
in accordance with the analyser manufacturers’ requirements, and
•
Competence can be demonstrated by satisfactory completion of the CPA1 ACS assessment, which covers the use
of electronic portable combustion gas analysers in accordance with BS 7967, Parts 1 to 4.
Periodical check
To keep the unit working properly over time, it is necessary to have qualified personnel make an annual check that in-
cludes the following tests:
•
The control and safety devices (gas valve, flow meter, thermostats, etc.) must function correctly.
•
The fume extraction circuit must be fully efficient.
•
The airtight chamber must be sealed
•
The air-fume end piece and ducts must be free of obstructions and leaks
•
The condensate evacuation system must be efficient with no leakage or obstructions.
•
The burner and exchanger must be clean and free of scale. When cleaning, do not use chemical products or wire
brushes.
•
The electrode must be free of scale and properly positioned.
•
The gas and water systems must be airtight.
•
The water pressure in the cold water system must be about 1 bar; otherwise, bring it to that value.
•
The circulation pump must not be blocked.
•
The expansion tank must be filled.
•
The gas flow and pressure must correspond to that given in the respective tables.
A
The boiler casing, panel and aesthetic parts can be cleaned with a soft damp cloth, possibly soaked in soapy
water. Do not use any abrasive detergents and solvents.
Opening the casing
To open the boiler casing (see fig. 33)
1. Undo the screws
A
2. Turn the casing
3. Lift the casing
B
Before carrying out any operation inside the
boiler, disconnect the electrical power supply
and close the gas cock upstream
fig. 33 - Opening the casing
A
A
1
3
2
