Air Conditioning Repair Certification (ETI) 2025 – 400 Free Practice Questions to Pass the Exam

Expansion valves are crucial components in air conditioning systems that serve the primary function of controlling the flow of refrigerant to the evaporator. By regulating the amount of refrigerant that enters the evaporator, the expansion valve ensures that the evaporator operates efficiently, absorbing heat from the indoor air and allowing the cooling process to occur effectively.

When the refrigerant passes through the expansion valve, it experiences a drop in pressure. This pressure reduction cools the refrigerant, which is then directed into the evaporator coils. By managing this flow, the expansion valve helps maintain the desired temperature within the system and prevents both excess pressure buildup in the evaporator and flooding of the coils, which can lead to inefficiency or system damage.

Understanding this role is essential for anyone involved in air conditioning repair and maintenance, as proper operation and adjustment of the expansion valve can directly impact the performance and efficiency of the entire cooling system.