EPA Section 608 Universal Certification ExamCoreMedium
A technician is recovering refrigerant from a system that contains a large amount of moisture. Which of the following recovery methods is most effective in preventing moisture from freezing and potentially damaging the recovery equipment?
- AActive recovery with a recovery unit that heats the refrigerant.
- BVapor recovery without an inline filter drier.
- CLiquid recovery using a manifold gauge set.
- DPassive recovery by simply venting the refrigerant.
Show answer & explanationAnswer & explanation
Correct answer: A. Active recovery with a recovery unit that heats the refrigerant.
When recovering refrigerant from a wet system, moisture can freeze in the recovery unit, causing damage. Active recovery units with heating capabilities prevent this by keeping the refrigerant warm, thus stopping the water from freezing.
Why the other options are wrong
- B. Vapor recovery alone is slow, and without a filter drier, moisture can still enter and freeze in the recovery unit.
- C. Liquid recovery is faster, but a manifold gauge set does not prevent moisture from freezing in the recovery equipment.
- D. Venting refrigerant is illegal and environmentally harmful, not a valid recovery method.
Moisture in Recovery
Moisture in a refrigeration system can freeze during recovery, especially with rapid pressure drops, potentially damaging recovery equipment.
- Moisture forms ice at low temperatures and pressures.
- Ice can obstruct flow and damage internal components of recovery units.
- Heating the refrigerant or using a dehydrating filter helps prevent freezing.
Memory trick: Hot recovery keeps the ice away.