EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Medium
A technician is using a self-contained (active) recovery unit to recover R-407C from a high-pressure appliance. Which of the following best describes the primary mechanism by which a self-contained recovery unit operates?
- AIt relies solely on the pressure difference between the system and the recovery cylinder.
- BIt uses an internal compressor to actively draw refrigerant from the system and force it into the recovery cylinder.
- CIt cools the recovery cylinder to create a vacuum, drawing refrigerant out of the system.
- DIt relies on the system's own compressor to transfer refrigerant to the recovery cylinder.
Show answer & explanationAnswer & explanation
Correct answer: B. It uses an internal compressor to actively draw refrigerant from the system and force it into the recovery cylinder.
Self-contained (active) recovery units contain their own compressor, which actively pumps refrigerant out of the system and into a recovery cylinder, allowing for faster and more complete recovery compared to passive methods.
Why the other options are wrong
- A. This describes a system-dependent (passive) recovery method, not a self-contained one.
- C. While cooling the cylinder can assist, it's not the primary mechanism of a self-contained unit; the compressor is.
- D. Self-contained units are independent of the system's compressor; they have their own.
Self-Contained Recovery Unit Mechanism
A self-contained (active) recovery unit is an independent piece of equipment that uses its own compressor to remove refrigerant from a system.
- Contains an internal compressor.
- Actively pumps refrigerant from the system to the recovery cylinder.
- Does not rely on the system's own pressure or compressor.
- Allows for faster and deeper vacuum recovery compared to passive methods.
Memory trick: ACTIVE means it ACTS with its OWN muscle.