EPA Section 608 Universal Certification ExamCoreHard
A technician is preparing to recover refrigerant from a system that has experienced a compressor burnout. Which of the following precautions should be taken immediately before recovery?
- ABypass the compressor to prevent further damage.
- BAdd a new charge of refrigerant to flush the system.
- CInstall a suction line filter drier and discharge line filter drier.
- DTest the system for non-condensable gases.
Show answer & explanationAnswer & explanation
Correct answer: C. Install a suction line filter drier and discharge line filter drier.
When a compressor burns out, it often contaminates the entire system with acid, moisture, and sludge. Installing suction and discharge line filter driers (often called burn-out driers) is crucial to clean the system during recovery and subsequent operation, protecting the new compressor and other components.
Why the other options are wrong
- A. Bypassing the compressor isn't a recovery precaution; the compressor is likely already damaged and needs to be replaced after the system is cleaned.
- B. Adding new refrigerant before recovery is counterproductive and can worsen contamination, as the system is already contaminated.
- D. While testing for non-condensables is generally good practice, addressing the severe contamination from a burnout takes precedence and requires specific filtration during recovery and operation.
Compressor Burnout Recovery
Compressor burnout introduces severe contaminants (acid, moisture, sludge) into the refrigeration system, requiring specialized procedures during recovery and repair.
- Contaminates entire system with acid, moisture, and carbon deposits.
- Requires installation of filter driers (suction and discharge) during recovery and for system cleanup.
- The recovered refrigerant will likely be highly contaminated.
- New compressor installation requires thorough system cleaning and evacuation.
Memory trick: Burnout = Bad contaminants. Filter driers are your cleaning command.