What is one of the main functions of the compressor in an HVAC system?

• A. To lower the pressure of the refrigerant
• B. To circulate the refrigerant throughout the system
• C. To condense the refrigerant vapor
• D. To trap moisture in the refrigerant

Answer: (B)

The main function of the compressor in an HVAC system is to circulate the refrigerant throughout the system, which is crucial for the refrigeration cycle to operate effectively. The compressor compresses the refrigerant gas, raising its pressure and temperature, thereby allowing it to flow through different components of the system. This pressurized gas travels to the condenser, where heat is released, and the refrigerant then continues to flow through the evaporator, absorbing heat from the environment and cooling the area being serviced. This circulation is essential for transferring heat from the inside of a building to the outside, thereby maintaining a consistent temperature within the space.

While other functions such as lowering pressure (which occurs in the evaporator) or condensing the refrigerant vapor (which happens in the condenser) occur at different stages of the refrigeration cycle, the key role of the compressor is primarily focused on the movement and circulation of refrigerant. Additionally, trapping moisture in the refrigerant is not a function attributed to the compressor; moisture control is typically managed by other components like the filter-drier or accumulator in the system.