Air Conditioning Repair Certification (ETI) Practice Exam 2025 - Free Air Conditioning Repair Practice Questions and Study Guide

Question: 1 / 400

With an automatic expansion valve, an increase in evaporator load will cause what change?

Increased head pressure

Decreased refrigerant flow

Constant pressure

Increased refrigerant flow

An automatic expansion valve (AEV) is designed to maintain a constant pressure in the evaporator by automatically adjusting the flow of refrigerant based on the evaporator's load. When the evaporator load increases, such as during periods of higher heat absorption, the AEV responds by allowing more refrigerant to flow into the evaporator. This is necessary to ensure that the evaporator can absorb the increased heat load effectively.

As more refrigerant enters the evaporator under the increased load, the system maintains its efficiency and prevents freezing or overheating. Therefore, the correct choice reflects the valve's function to accommodate varying load conditions, which is to increase the flow of refrigerant. This dynamic adjustment keeps the system operating within optimal parameters and ensures proper cooling performance.

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