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

A liquid line filter-drier is an essential component in an air conditioning system, and its placement is crucial for effective operation. The filter-drier is designed to remove moisture and contaminants from the refrigerant before it enters sensitive components of the system. By placing the filter-drier between the accumulator and the compressor, it allows for the protection of the compressor, which can be severely damaged by the presence of moisture and debris.

Typically, the accumulator is responsible for ensuring that only vapor enters the compressor, and the filter-drier helps to maintain the cleanliness and dryness of the refrigerant that reaches the compressor from the accumulator. This strategic placement ensures that the compressor operates efficiently and extends its life by preventing issues related to contamination and moisture that could lead to mechanical failure.

In contrast, the other arrangements mentioned would not provide the same level of protection for the compressor as placing the filter-drier between the accumulator and the compressor. It is important to maintain the cleanliness of the refrigerant throughout the entire system, especially before it enters the compressor, which is one of the most critical components in the HVAC system.