ESCO Air Conditioning Practice Exam 2025 - Free AC Certification Practice Questions and Study Guide

Positioning a liquid line filter-drier between the condenser and metering device is optimal for system performance for several reasons. The primary function of the filter-drier is to remove moisture and impurities from the refrigerant, which can cause corrosion, reduced efficiency, and operational issues within the system.

By placing it after the condenser, the filter-drier can effectively capture any debris generated during the condensing process and ensure that the refrigerant entering the metering device is clean and dry. The metering device is crucial for regulating the flow of refrigerant into the evaporator; any contaminants here could disrupt the operation of the system and potentially damage components downstream. Furthermore, this placement allows the filter-drier to act as a safeguard before the refrigerant enters the sensitive components of the evaporator, ensuring that only optimal-quality refrigerant is used for heat exchange.

Overall, this strategic positioning contributes to maintaining the efficiency and longevity of the air conditioning system by ensuring proper refrigerant quality before it cycles through the critical cooling components.