Ace Your HVAC EPA Certification 2025 – Chill with Confidence and Conquer the Exam!

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What does a thermal expansion valve do in an HVAC system?

Regulates the flow of refrigerant into the evaporator coil

The thermal expansion valve plays a critical role in an HVAC system by regulating the flow of refrigerant into the evaporator coil. This component is essential for maintaining the proper pressure and temperature of the refrigerant, ensuring that it evaporates effectively within the coil.

When the refrigerant enters the evaporator, it must be in a specific state to absorb heat from the indoor environment efficiently. The thermal expansion valve controls the amount of refrigerant that flows into the evaporator based on the cooling load requirements of the space. It ensures that the refrigerant is neither overfed nor underfed, allowing for optimal heat exchange and efficient cooling.

By accurately managing the refrigerant flow, the thermal expansion valve helps maintain system efficiency and performance while preventing issues such as low cooling capacity or compressor damage from liquid refrigerant returning to the compressor.

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Filters impurities from the refrigerant

Controls the compressor speed

Recaptures lost heat

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