The digital burner controller regulates the frequency of the power supply to the VSD, which in turn controls the rotational speed of the burner’s fan motor. This is said to be particularly appropriate for low fire regimes, providing greater control of air flow when the fan motor speed is slowed and the gas intake is reduced for low load operations. The conversion can deliver an improvement in the ratio of maximum burner output to minimum burner output (turn down ratio) of 6:1.

The company claims that the retrofit is capable of fuel savings of between 3 and 6%, dependent upon the existing control. The digital conversion provides for precise actuator positioning and repeatability, with the digital servomotor accurate to 0.1° of rotation, for more efficient combustion systems.

The conversion is also said to reduce fan motor power consumption by up to 50% for further energy savings. The reduction in burner on/off cycling and the fact that there are no linkages on the digital servomotors result in is less wear and tear.