By how much does the AC cut in pressure exceed the system pressure?

The correct answer indicates that the AC cut-in pressure exceeds the system pressure by 10 psi. This value is significant in understanding the operational parameters of an air conditioning system, particularly regarding how the system responds to pressure fluctuations.

The cut-in pressure is the threshold at which the compressor is activated to maintain desired system pressure levels. A difference of 10 psi ensures that the compressor kicks in appropriately to stabilize the refrigerant flow and maintain efficient operation. This helps in providing adequate cooling while preventing short cycling, where the compressor turns on and off too frequently.

Additionally, maintaining this specific pressure differential contributes to the longevity and reliability of the AC system. It also allows for a margin that accounts for pressure drops in the system due to various factors like temperature changes, refrigerant state, and system load.

Understanding this pressure differential is critical for anyone working in the field, as it directly impacts the performance and efficiency of HVAC systems.