CSLB C-20 HVAC ContractorCooling and RefrigerationMedium
A technician arrives to recover refrigerant from a system whose compressor has burned out and no longer runs. Which recovery method must be used?
- APassive recovery is required by EPA regulation for all compressor failures
- BActive (self-contained) recovery, using a dedicated recovery machine since the system's compressor is inoperable
- CVenting to atmosphere is permitted because EPA exempts systems with burned-out compressors
- DPassive (system-dependent) recovery, using the system's own compressor since it recovers refrigerant more thoroughly
Show answer & explanationAnswer & explanation
Correct answer: B. Active (self-contained) recovery, using a dedicated recovery machine since the system's compressor is inoperable
Passive (system-dependent) recovery relies on the appliance's own compressor to push refrigerant into the recovery cylinder, which is impossible if the compressor has failed. An active (self-contained) recovery machine with its own compressor and pump must be used instead. Venting is never permitted regardless of compressor condition.
Why the other options are wrong
- A. Passive recovery cannot function without an operable compressor, making this option physically impossible.
- C. EPA Section 608 venting prohibitions have no exemption for compressor failure.
- D. This method requires a working compressor, which is unavailable in this scenario.
Active vs. Passive Recovery
Passive (system-dependent) recovery uses the appliance's own compressor to move refrigerant; active (self-contained) recovery uses a dedicated recovery machine's compressor.
- Passive method fails if the system's compressor is inoperable
- Active recovery machines have independent pumping capability
- Venting to atmosphere is prohibited under EPA Section 608 regardless of compressor condition
Memory trick: No compressor, no passive — go active instead