Question 80Refrigeration & AC - 1st Asst/Chief

The correct answer is D) Adjust compressor's unloader to reduce operating cylinders. When a reciprocating multi-cylinder air conditioning or refrigeration compressor starts cycling on and off, it indicates an imbalance between the system's refrigerant demand and the compressor's capacity. By adjusting the compressor's unloader to reduce the number of operating cylinders, the compressor's capacity is decreased, which can help prevent the cycling behavior. This allows the compressor to better match the system's refrigerant demand, stabilizing the operation. The other options are not the best solutions in this scenario. Adjusting the system thermostatic control valve(s) (option A) may not be effective, as it does not directly address the compressor's capacity. Stopping the compressor and waiting for the system to stabilize (option B) is a temporary fix and does not provide a long-term solution. Adjusting the cylinder unloader to increase the system operating refrigerant pressure (option C) may not be appropriate, as it could lead to other issues, such as increased energy consumption or potential system damage.