What component enables the use of a single compressor to control multiple cases at different temperatures?

The component that allows a single compressor to manage multiple cases at different temperatures is the evaporator pressure regulator. This device plays a crucial role in HVAC refrigeration systems by regulating the pressure in the evaporators, which can be necessary when different cases require varying temperature settings.

The evaporator pressure regulator works by adjusting the flow of refrigerant to each evaporator based on the temperature needs of the cases. It ensures that the refrigerant evaporates at the correct temperature and pressure, optimizing the cooling efficiency for different applications. This capability is essential in commercial refrigeration setups where items such as perishable goods may need to be stored at specific and varied temperatures.

In contrast, while an expansion valve is critical for controlling the refrigerant flow and pressure drop before entering the evaporator, it does not inherently manage the operational temperature differences between multiple cooling cases. The condenser coil is responsible for rejecting heat from the refrigerant but does not interact with multiple temperature zones directly. An accumulator’s function is to store excess refrigerant and prevent liquid from entering the compressor, but it also does not control operating temperatures across multiple applications.