Question 160Refrigeration & AC - Assistant Engineer

The correct answer is B) suction valve. When starting a reciprocating refrigeration compressor that has been shut down for a period of time, you should manually throttle the suction valve. This is done to prevent a sudden rush of refrigerant into the compressor, which could damage the compressor. Throttling the suction valve allows the compressor to gradually build up pressure and draw in refrigerant at a controlled rate, protecting the system. The other options are incorrect because the king valve is not involved in this process, the expansion valve controls the flow of refrigerant into the evaporator, and the sea water valve is not directly related to starting the compressor.