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Safety Practices Flashcards

7 cards from real HVAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Safety Practices flashcards as text

  1. Which safety device is required on a refrigerant recovery cylinder to prevent over-pressurization?

    Answer: A pressure relief valve or fusible plug

    Recovery cylinders must have a pressure relief valve or fusible plug to safely vent refrigerant if internal pressure becomes dangerously high.

  2. What is the purpose of evacuating an HVAC system to 500 microns or lower before charging with refrigerant?

    Answer: To remove air and moisture that would cause system damage and reduced efficiency

    Deep evacuation removes non-condensables (air) and moisture, both of which degrade system performance and can cause acid formation and corrosion.

  3. A technician needs to work on an HVAC unit energized at 480V. According to NFPA 70E, what PPE category likely applies for this voltage level?

    Answer: PPE Category 2 or higher — arc flash suit and face shield

    480V systems typically require PPE Category 2 or higher per NFPA 70E, including arc-rated clothing, face shield, and insulated gloves.

  4. Why should a technician NEVER use oxygen to pressurize an HVAC refrigerant system for leak testing?

    Answer: Oxygen combined with refrigerant oil can create an explosive mixture

    Oxygen combined with compressor oil and refrigerant can form an explosive mixture that can detonate under pressure.

  5. Which OSHA standard specifically governs lockout/tagout procedures for HVAC equipment with stored energy?

    Answer: 29 CFR 1910.147 — Control of Hazardous Energy

    OSHA 29 CFR 1910.147 (Control of Hazardous Energy) governs lockout/tagout procedures to prevent unexpected energization of equipment during maintenance.

  6. What is the primary reason technicians should never mix different types of refrigerant oils in an HVAC system?

    Answer: Mixing oils can cause chemical reactions, sludge formation, and compressor failure

    Incompatible oil mixtures can cause chemical reactions, form sludge that clogs the system, and lead to premature compressor failure.

  7. When a technician is working in a mechanical room with a carbon monoxide alarm sounding, what is the correct response?

    Answer: Evacuate immediately and call emergency services — do not re-enter until cleared

    Carbon monoxide is colorless and odorless, making immediate evacuation and emergency services contact critical — a dust mask provides no CO protection.