Which devices control the high side float?

The control of the high side float in a refrigeration system primarily involves the condenser and receiver. In this context, the condenser's role is to condense the refrigerant vapor from the compressor into a liquid form by dissipating heat. This process allows the refrigerant to transition from a gas to a liquid, which is crucial for maintaining the proper flow and pressure in the system.

The receiver, on the other hand, serves as a storage vessel for the condensed refrigerant before it moves into the expansion device (like an expansion valve). It also helps to ensure that only liquid refrigerant enters the system's low side, which includes the evaporator. The high side float works by monitoring and controlling the level of refrigerant in the receiver, ensuring optimal performance of the system and preventing issues such as flooding or starvation of the evaporator.

Both components – the condenser and receiver – play a vital role in managing the refrigerant's pressure and flow, which is essential for the efficient operation of the refrigeration system. This synergy is what makes the combination of these devices the correct answer for controlling the high side float.