Why are two low side floats placed in parallel?

The correct answer is that two low side floats are placed in parallel primarily to ensure that each float feeds its own evaporator. This configuration enhances the system's reliability and functionality by allowing multiple evaporators to operate independently. If one float goes out of service or needs maintenance, the other can continue to feed refrigerant, ensuring that the evaporators remain operational. This redundancy is crucial in systems where maintaining a steady and reliable cooling process is essential.

In scenarios where there are multiple evaporators in a system, having individual floats allows for more precise control of the refrigerant flow to each evaporator based on its demand and conditions, leading to better overall system performance.