The load demand is determined by the outdoor temperature and follows a certain curve. The combustion control is based on O2 control with excess air set-point around 2.5 %. To keep the correct O2 level, secondary air fans are adjusted, and if that is not sufficient, primary air fans are also adjusted. In case of high CO levels, O2 is regulated according to set-points following a curve. If the O2 levels drop, the system has three minutes to adjust or the fuel feeding system shuts down (R. Assarsson, personal communication, November 1, 2010).
The load demand is determined by the outdoor temperature and follows a certain curve. The combustion control is based on O2 control with excess air set-point around 2.5 %. To keep the correct O2 level, secondary air fans are adjusted, and if that is not sufficient, primary air fans are also adjusted. In case of high CO levels, O2 is regulated according to set-points following a curve. If the O2 levels drop, the system has three minutes to adjust or the fuel feeding system shuts down (R. Assarsson, personal communication, November 1, 2010).
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