ESCO Air Conditioning Practice Exam

A thermostatic expansion valve is designed to maintain

1. Constant evaporator pressure

2. Constant evaporator superheat

3. Constant refrigerant flow

4. Variable refrigerant flow

The correct answer is: Constant evaporator pressure

A thermostatic expansion valve is designed to maintain a constant evaporator pressure. This is essential for the proper functioning of the air conditioning system as it ensures that the refrigerant evaporates at a consistent rate, leading to efficient cooling performance. By controlling the flow of refrigerant into the evaporator coil based on the superheat feedback, the expansion valve helps maintain a stable pressure level, allowing the system to operate effectively.