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Bringing an additional pump online in a refrigeration system requires careful management of the suction and discharge valves to ensure the system operates correctly and safely. Opening the suction valve first is crucial because it allows the pump to draw refrigerant into the system, which is necessary for the pump to function effectively. If the suction valve were closed when the pump starts, it could create a vacuum on the suction side, leading to potential damage or overheating of the pump due to cavitation.

After ensuring that the suction line is clear, the next step involves gradually opening the discharge valve. This approach allows you to control the flow and pressure in the system, preventing any sudden changes that could cause fluctuations or system shocks. By performing these steps in the correct sequence, you maintain the integrity of the refrigeration system and reduce the risk of issues that could arise from improper valve management.

This method emphasizes the importance of a systematic approach to starting up pumps within complex systems, highlighting the interactions between various components and the need for careful handling of pressure and flow to ensure smooth operation.