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EPA 608 Refrigerant Certification 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 EPA 608 Refrigerant Certification flashcards as text

  1. What critical safety hazard is associated with refrigerant cylinders exposed to direct flame or excessive heat?

    Answer: BLEVE (Boiling Liquid Expanding Vapor Explosion)

    Overheated refrigerant cylinders can experience a BLEVE — a catastrophic explosion caused by rapid vaporization of liquid refrigerant exceeding cylinder pressure limits.

  2. What does a subcooling measurement tell a technician about a refrigeration system?

    Answer: How much the liquid refrigerant temperature is below its saturation temperature at the condenser outlet

    Subcooling is the number of degrees the liquid refrigerant has cooled below its saturation (condensing) temperature, ensuring solid liquid reaches the expansion device.

  3. Which type of metering device maintains a constant evaporator superheat regardless of load changes?

    Answer: Thermostatic Expansion Valve (TXV/TEV)

    The TXV (Thermostatic Expansion Valve) senses evaporator outlet temperature and adjusts refrigerant flow to maintain a constant superheat set point.

  4. Under EPA 608, which of the following is NOT a recognized method for verifying that a leak repair was successful?

    Answer: Visually inspecting for oil staining only

    Visual inspection for oil staining alone is not an accepted verification method; EPA requires leak testing with detectors, pressure testing, or operational verification.

  5. What is the GWP of R-410A relative to CO2?

    Answer: Approximately 2,088

    R-410A has a GWP of approximately 2,088, making it a significant greenhouse gas and a target for phase-down under AIM Act regulations.

  6. An HVAC technician discovers a system has non-condensables mixed with the refrigerant. What is the recommended procedure?

    Answer: Recover the refrigerant charge and send it to a certified reclaimer

    Refrigerant contaminated with non-condensables must be recovered and sent to a certified reclaimer; venting refrigerant to atmosphere is illegal under EPA 608.

  7. What is the purpose of the Schrader valve core on a refrigerant service port?

    Answer: To prevent refrigerant from escaping when service hoses are not connected

    The Schrader valve core acts as a check valve in the service port, preventing refrigerant loss when service hoses or gauges are not connected.