To lessen short cycling, what would you do to the pressure control?

• A. Widen the differential
• B. Lower the cut-in setting
• C. Narrow the differential
• D. Raise the cut-out setting

Answer: (A)

Short cycling happens when a pressure-controlled system keeps starting and stopping because the operating range is too small. The pressure control uses a cut-in pressure to begin, and a cut-out pressure to stop; the differential is the gap between those two values. Widening this differential gives a larger gap between the start and stop points, so the system runs longer before stopping. That reduces how often it has to re-ignite, which minimizes wear and energy wasted on frequent cycling.

Lowering the cut-in setting would cause the system to begin earlier, which can actually increase the number of cycles. Narrowing the differential would make cycling happen even more often. Raising the cut-out setting changes when it stops but doesn’t address the frequency of starts as effectively as widening the differential.