EPA Section 608 Universal Certification ExamCoreMedium
A technician is installing a new split system that uses R-410A. Which of the following components helps to prevent liquid refrigerant from returning to the compressor, especially during low-load conditions?
- AReceiver
- BFilter-drier
- CAccumulator
- DSight glass
Show answer & explanationAnswer & explanation
Correct answer: C. Accumulator
An accumulator is installed in the suction line before the compressor. Its primary function is to temporarily hold excess liquid refrigerant, preventing it from entering the compressor and causing slugging or damage, particularly during periods of low load or sudden changes in system operation.
Why the other options are wrong
- A. A receiver stores excess liquid refrigerant on the high-pressure side after the condenser, not to protect the compressor from liquid slugging.
- B. A filter-drier removes moisture and contaminants but does not prevent liquid slugging.
- D. A sight glass is used to visually inspect the refrigerant charge and condition, not to prevent liquid from returning to the compressor.
Suction Line Accumulator
A component installed in the suction line of a refrigeration system, just before the compressor, designed to prevent liquid refrigerant from returning to the compressor, thus protecting it from damage.
- Located in the suction line.
- Protects compressor from liquid slugging.
- Temporarily stores excess liquid refrigerant.
- Especially important in heat pump systems or systems with varying loads.
Memory trick: An 'Accu'mulator 'Accu'rately prevents liquid to the compressor.