ESCO Air Conditioning Practice Exam

Low operating pressures and low system amperage draw in a residential split system are often indicative of low airflow across the evaporator. When there is insufficient airflow, it means that the air is not effectively moving across the evaporator coil. This lack of airflow prevents proper heat exchange, resulting in lower pressures in the system and reduced current draw.

In a split system, the evaporator coil's primary function is to absorb heat from the indoor air. When airflow is blocked or insufficient due to problems like dirty filters, closed vents, or obstructed ducts, the evaporator coil may not receive adequate air. Consequently, this can lead to low refrigerant evaporation rates and lower operating pressures. The drop in amperage is a result of the compressor not being able to function optimally due to reduced load from insufficient heat absorption.

Addressing airflow issues can restore optimal function and efficiency to the system, enhancing comfort and performance.