On a low pressure boiler, what does cutout equal?

The concept of cutout in the context of a low-pressure boiler relates to the operation of the boiler’s control system, particularly in a pressure control scenario. Cutout refers to the pressure point at which the burner is turned off, while the cut-in point is where the burner is activated.

Cutout equals the cut-in pressure plus the differential because the differential represents the range of pressure over which the burner functions. When the burner is turned off at the cutout point, it has reached an adequate level of pressure that incorporates the necessary margin provided by the differential.

For instance, if the cut-in pressure is the point where the burner engages to increase pressure, the cutout point must be higher to ensure there is enough pressure difference (the differential) to operate efficiently and prevent short cycling of the burner. This establishes a clear operational band for the boiler’s pressure, ensuring stability and safe operation. Therefore, the correct calculation of the cutout level as cut-in plus the differential maintains the proper functioning of the boiler system.