Digital combustion controls replace the old mechanical burner modulation control linkages with an extremely accurate electronic system. On an electronic system, the combustion components of a burner i.e. fuel, air and primary air are each driven by an individual actuator.
These actuators are controlled by a programmable controller. Once commissioned, the inherent hysteresis of the redundant mechanical linkage is removed so optimal combustion is maintained throughout the modulation range. It is also important to ensure that the minimum amount of fuel is burnt to maintain the steam pressure target set point.
At no point, irrespective of load change is this target exceeded or fallen short of. Actuators have an incredible repeatable high degree of accuracy (maximum error in degrees angular rotation is 0.1 degrees).
Minimum savings of 5% can rise to 8-9% dependent on the condition of the burner linkage.
See our case study: http://www.jbcindserv.co.uk/case-studies/4-boilers-1-oilon-ecosafe