When could a reciprocating compressor be damaged if energized? (A) A) When the demand for cooling is at a steady state. (B) B) When the discharge service valve is open. (C) Q) When the suction service valve is open. (D) When the discharge service valve is closed

A reciprocating compressor can be damaged if energized under certain conditions that prevent normal operation and can lead to excessive pressure buildup or lack of lubrication. Let's analyze each option: **(A) When the demand for cooling is at a steady state.** - **Analysis:** Operating at steady state typically means the compressor is functioning under normal conditions without sudden changes that could cause damage. This scenario is generally safe for the compressor. **(B) When the discharge service valve is open.** - **Analysis:** If the discharge valve is open, the compressor can operate without significant back pressure, which is generally safe. However, continuous operation without adequate load can lead to overheating over time, but it's not an immediate cause of damage upon energizing. **(C) When the suction service valve is open.** - **Analysis:** The suction valve is intended to be open during normal operation to allow refrigerant to enter the compressor. This is a standard operating condition and does not inherently cause damage. **(D) When the discharge service valve is closed.** - **Analysis:** Closing the discharge valve while energizing the compressor prevents the refrigerant from exiting. This leads to a rapid buildup of pressure within the compressor, which can cause mechanical stress, overheating, and ultimately damage the compressor components. **Correct Answer:** **D) When the discharge service valve is closed.**