What is the correct procedure to put an additional pump online in a refrigeration system?

The procedure for bringing an additional pump online in a refrigeration system is best represented by the action of opening the suction valve while gradually opening the discharge valve. This approach is critical because it prevents potential issues that could arise from sudden pressure changes in the system. By first ensuring that the pump has suction flow before opening the discharge, you minimize the risk of cavitation and other operational hazards.

The gradual opening of the discharge valve allows for a controlled increase in pressure and flow rates, ensuring that the system can accommodate the new pump without causing shock that could lead to damage or inefficiency. Balancing the suction and discharge in this manner is crucial for maintaining the integrity of the entire refrigeration cycle.

Other options might suggest actions that either overlook the importance of pressure management or focus on general maintenance checks instead of the specific operational steps needed when integrating a pump into the system. This option highlights the procedural nuances that are essential for the safe and effective operation of refrigeration systems.