Question 82Refrigeration & AC - 1st Asst/Chief

The correct answer is A) suction valve. When starting a reciprocating refrigeration compressor that has been shut down for a period of time, the suction valve should be manually throttled. This is done to avoid a sudden rush of refrigerant into the compressor, which could potentially damage the compressor. Throttling the suction valve allows the compressor to gradually build up suction and pressure, ensuring a smooth and controlled start-up process. The other options are incorrect because the sea water valve, king valve, and expansion valve are not directly involved in the start-up procedure for a reciprocating refrigeration compressor.