Intergas Heating Ltd
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10.3 Combustion
During routine servicing, and after any maintenance or change of part of the
combustion circuit the following must be checked:
• The integrity of the flue system and the flue seals, as described in § 8.5 and the
British Standards codes of practices, specifically BS 5440.
• The integrity of the boiler combustion circuit and the relevant seals, as described in §
12.3.
The operational (working) gas inlet pressure at maximum rate, as described
in § 0.7.2.
• The combustion performance, as described in § 10.7 and § 10.8.
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
assesment, which covers the use of electronic portable combustion gas analysers in
accordance with BS7967, Parts 1 to 4.
Connect the flue gas analyser to the flue gas sampling point (X) and check combustion as
described in § 10.7. If the CO
2
percentage reading of the combustion gases at low setting
falls into the bandwith stated in § 10.8 the combustion setting is correct and no further
adjustment is needed. If the combustion reading falls outside the prescribed tolerance
band and the integrity of the complete flue system and combustion circuit seals have
been verified as well as the inlet gas pressure proceed to adjust the gas/air ratio as
descibed in § 10.8. When the CO
2
percentage at high setting is not within the prescribed
tolerance band please contact Intergas Heating.
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