What is the function of a receiver in an HVAC system?

The function of a receiver in an HVAC system is to store excess refrigerant, particularly in systems using vapor-compression refrigeration. The receiver acts as a reservoir that holds refrigerant during its transition between different stages in the refrigeration cycle. When the refrigerant leaves the condenser, it is in a liquid state and might vary in quantity depending on system demand and operational conditions. The receiver helps manage this excess refrigerant, ensuring a stable supply to the expansion device, which regulates the flow of refrigerant into the evaporator. This storage capability is crucial for maintaining system efficiency and preventing any issues that could arise from fluctuations in refrigerant levels.

Other functions mentioned in the available choices, such as controlling air temperature or filtering refrigerant, are accomplished by separate components in the HVAC system, like thermostats and filters. Additionally, while the receiver does contain refrigerant under pressure, its primary role is not to increase system pressure; that function is typically performed by the compressor. Thus, assessing the role of the receiver clarifies its essential purpose in stabilizing the refrigerant flow within the system.