What should an operator do when suction pressure rises?

When suction pressure rises in a refrigeration system, this often indicates that the system is experiencing a reduced ability to absorb heat, which could lead to inefficiencies or even operational issues. Starting another compressor can help balance the load by increasing the capacity of the system to remove heat from the refrigerant, effectively lowering the suction pressure.

The reason for selecting this action lies in the mechanics of how refrigeration systems operate. A higher suction pressure usually suggests less cooling capacity or an overload condition, meaning there is not enough refrigerant flow or cooling action taking place. By introducing another compressor, you help to manage the refrigerant flow and pressure more effectively, ensuring the system runs as designed.

Adjusting other components, such as increasing refrigerant flow or changing fan speed, may not address the fundamental issue of rising suction pressure as effectively. These strategies may also complicate the operation without addressing the underlying capacity problem. Opening the discharge valve is not typically a common practice to address suction pressure increases and could lead to additional complications in the system's operation.