A technician is removing a compressor that suffered a motor burnout, and the oil coming out of it is dark and smells sour. What precautions belong on that job?
Correct Answer
A) Gloves and eye protection together with good ventilation, because the oil and residue carry acid and irritating breakdown products
A motor burnout cooks the refrigerant and oil together, producing acid and sooty breakdown products that stay in the oil and coat the inside of the system. That residue irritates and burns skin and eyes on contact and gives off fumes that should not be breathed. Gloves, eye protection and ventilation are the baseline, along with care in handling and disposing of the contaminated oil. The acid does not neutralize on exposure to air, which is exactly why filter driers and a full cleanup procedure are required.
Why This Is the Correct Answer
Burnout residue is acidic and irritating, and it is present in the oil, on internal surfaces and in the vapor coming out of the opened system. Skin contact, eye contact and inhalation are all real routes of exposure, so hand and eye protection plus ventilation cover the actual hazards of the job.
Why the Other Options Are Wrong
Option B: A grounding strap, because a burned motor leaves a static charge in the oil that can discharge when the shell is opened
Oil does not hold a static charge from a burned motor, and grounding addresses an electrical hazard that is gone once the unit is disconnected. It does nothing about the corrosive residue actually in the oil.
Option C: Nothing beyond the usual gloves and glasses, because the acid in the oil neutralizes as soon as the system is opened to the atmosphere
Acid in burnout oil does not neutralize on contact with air. That belief is what leads technicians to handle the oil bare-handed and to skip the filter driers the cleanup procedure depends on.
Option D: A respirator only, because the breakdown residue is hazardous to breathe but does no harm to the skin it touches
The residue is corrosive to skin as well as irritating to breathe. Protecting only the lungs leaves hands and eyes exposed to the material that is easiest to get on them while pulling the compressor.
Memory Technique
Black oil, sour smell, acid. Gloves and glasses before anything else comes apart.
Reference Hint
Motor burnout produces acidic decomposition products in the oil and refrigerant; skin, eye and respiratory protection plus ventilation are required.
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