In an air conditioning system, low discharge head pressure associated with a reciprocating compressor can be the result of what condition?

Correct Answer: Option A — leaky suction valves

Leaky suction valves allow high-pressure discharge gas to bypass back into the cylinder during the compression stroke. This internal leakage reduces the effective volumetric efficiency and lowers the discharge head pressure, as the compressor fails to build the required pressure differential across the system components.