American Home Inspectors Training (AHIT) Practice Test

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What is the purpose of an expansion valve in an air conditioning system?

  1. To increase the refrigerant pressure

  2. To regulate the flow of refrigerant

  3. To condense the refrigerant gas

  4. To heat the refrigerant

The correct answer is: To regulate the flow of refrigerant

The purpose of an expansion valve in an air conditioning system is to regulate the flow of refrigerant. This component plays a critical role in controlling the amount of refrigerant that enters the evaporator coil. By managing the flow, the expansion valve ensures that the refrigerant is metered properly, allowing it to expand and cool as it absorbs heat from the indoor air. This process is essential for maintaining efficient cooling within the system. In addition, the expansion valve also helps to maintain the pressure differential between the high-pressure side and the low-pressure side of the system, which is crucial for the overall operation of the air conditioning system. Maintaining this pressure helps optimize the cooling performance and efficiency of the entire setup.