EPA Section 608 Universal Certification ExamCoreMedium
A technician is performing maintenance on a residential split system that uses R-410A. The system has a liquid line filter drier. What is the primary function of this component?
- ATo remove non-condensable gases from the refrigerant.
- BTo regulate the flow of refrigerant into the evaporator coil.
- CTo increase the subcooling of the liquid refrigerant.
- DTo filter out moisture and solid contaminants from the refrigerant.
Show answer & explanationAnswer & explanation
Correct answer: D. To filter out moisture and solid contaminants from the refrigerant.
The liquid line filter drier is a crucial component in a refrigeration system designed to remove both moisture (using a desiccant material) and solid contaminants (using a filter screen) from the refrigerant, protecting other components like the expansion valve and compressor.
Why the other options are wrong
- A. Non-condensable gases are removed by evacuation, not by a filter drier.
- B. Refrigerant flow is regulated by an expansion valve or capillary tube, not the filter drier.
- C. Subcooling occurs in the condenser; the filter drier does not directly increase it.
Liquid Line Filter Drier
A component in the liquid line of a refrigeration system that serves to remove moisture (using a desiccant) and solid contaminants (using a filter) from the refrigerant, protecting the system from damage and ensuring efficient operation.
- Contains desiccant for moisture removal.
- Contains filter screen for solid particle removal.
- Protects expansion valve and compressor.
Memory trick: Filter drier: the system's clean-up crew.