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O2, oxygen, is a colourless, odourless, tasteless gas. It forms approximately 21 percent of air. Oxygen is an indispensible component of the combustion process.
- O2 trim (oxygen trim)
An O2 sensor or an electrode is used to measure combustion quality and, when the quality deviates, small adjustments are made to compensate. This reduces emissions and keeps combustion quality and efficiency at the highest level. O2 trim reduces fuel consumption and thus fuel costs for larger burner systems. Note: Larger burners use an O2 sensor; the gas-fired WTC condensing boiler uses an ionisation electrode, similar to the Lamda sensor in motor vehicle engines.
- Oil dosing pump
A pump fitted in the oil line which regulates the supply of fuel oil. The variable flow of fuel oil enables premix oil burners to modulate, i.e. to continually adjust their capacity.
- Oil feed pump
A pump fitted in the oil line which feeds oil at pressure to an oil-fired condensing boiler.
- Oil preheater
An oil preheater is a unit or a component that warms fuel oil to improve its viscosity. The oil preheating process is used, for example, when firing heavy oils, as the viscosity of those oils is not suitable for atomisation by the burner nozzles. Light fuel oil is also preheated in low-capacity burners, such as the WL5-purflam®, so that fine atomisation of the oil can be ensured even after long periods of inoperation or in low ambient temperatures. Benefits include a lower fuel throughput (and therefore lower ratings), improved combustion with reduced emissions, and an improved burner start.
- Oil supply pump
A pump fitted in the oil line which supplies oil under suction to an oil-fired condensing boiler.
- Oil-fired condensing boiler
A system by which the heating circuit water and usually also the domestic hot water supply is heated. The boiler is designed to recover additional heat by condensing the water vapour in the flue gases, thereby achieving a very high degree of efficiency. Fuel oil is used as the energy source.