Safety, Environmental, and Regulatory Compliance
Safety First
A/C service involves high-pressure refrigerant, rotating belts, and electrical systems. Wear eye protection and gloves; liquid refrigerant causes frostbite. Never heat a closed system or cylinder; never weld near refrigerant lines. Use proper lifting and support for heavy roof units. Disconnect battery before electrical work, and be aware of airbag and high-voltage systems on some buses.
Environmental and Regulatory Rules
Refrigerant must not be vented. Technicians must be certified to handle refrigerant, use approved recovery equipment, and follow labeling and recordkeeping rules. Recovery cylinders must be approved, not overfilled, and clearly labeled. Used oil and contaminated refrigerant are handled as regulated waste. Questions test whether you know venting is prohibited, that only certified technicians may service refrigerant, and that recovery is required before opening a system.
Traps to Watch
A common trap: a question suggesting it is acceptable to vent a small amount of refrigerant during service - it is not. Another trap is using an unapproved or disposable container for recovered refrigerant. Watch for questions about mixing refrigerants or topping off a leaking system; both are non-compliant. Also be alert to safety questions about refrigerant contact with skin or eyes - flush with water and seek medical attention, do not rub.
Worked Rule of Thumb
Before any service that opens the refrigerant circuit: verify certification, connect approved recovery equipment, recover refrigerant, and cap or plug open lines to keep moisture and debris out. If refrigerant contacts skin or eyes, flush immediately with cool water and seek medical attention.