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Burner Controls - Burner @ 1200kW or above

Gas fired burners with a thermal output at or below 1,200KW, must be fully modulating over a turndown range of at least three to one, and be continuously modulated in response to measured boiler temperature or pressure values using PID control or more advanced equivalents. The burner must be equipped with pneumatic or electronic air/fuel ratio controls, so oxygen levels in the exhaust gases can be set at a maximum of 3% at 100% rating, 4% at 50% rating and 4.8% at 33% rating. Carbon monoxide (CO) levels in the exhaust gases must not exceed 50 ppm throughout the range.

Oil fired burners with a thermal output at or below 1,200kW must have at least three stages of output or be fully modulating over a turndown ratio of at least two to one. They must be equipped with controls that enable oxygen levels in the exhaust to be set at a maximum of 3% at 100% rating and 4% at 50% rating. Carbon Monoxide (CO) levels in the exhaust gases must not exceed 100 ppm throughout the range. All burners must be fitted with air dampers that fully close on burner shutdown.

Note. The following amendments to the criteria for this category are planned to improve efficiency:

Date effective Measure
April 2004 All gas and dual fired burners rated above 400kW must have microprocessor-based controls and a variable speed drive fitted to the forced draught fan. All gas and dual fired burner control elements including combustion air dampers and fuel valves must be fitted with a precision servomotor, which must be separately controlled and include positional or flow based feedback control.