What should the cut-in pressure be compared to the cut-out pressure on a low pressure control?

The cut-in pressure should be lower than the cut-out pressure on a low pressure control. This design is fundamental to the operation of pressure controls in refrigeration and air conditioning systems.

When the system pressure falls below the cut-in set point, the control device activates the compressor to restore the pressure. Conversely, once the desired higher pressure (cut-out pressure) is reached, the control device deactivates the compressor to prevent over-pressure conditions.

This difference between the cut-in and cut-out pressures creates a differential that allows the compressor to cycle on and off efficiently. Such cycling helps maintain the desired refrigerant pressure in the system while avoiding excessive wear on the compressor and preventing potential damage from operating under unsuitable conditions.

In contrast, if the cut-in pressure were higher than the cut-out pressure, it would lead to erratic system behavior, as the compressor would never operate effectively within the designed pressure range, risking higher operational costs and inefficiencies.