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Air Conditioning Flashcards

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

Read the first 6 Air Conditioning flashcards as text

  1. Which type of compressor uses scroll technology and is common in modern residential AC units?

    Answer: Scroll

    Scroll compressors use two interlocking spirals and are favored in residential equipment for efficiency and quiet operation.

  2. What is the minimum SEER2 requirement for a new split-system AC unit installed in the US Southeast after January 1, 2023?

    Answer: 14 SEER2

    The US Department of Energy set the minimum SEER2 efficiency standard at 14 for split systems in the Southeast and Southwest regions effective January 2023.

  3. What is the function of a crankcase heater on a compressor?

    Answer: Prevent refrigerant from migrating into the compressor oil during off cycles

    Crankcase heaters keep compressor oil warm to prevent refrigerant absorption and potential liquid slugging on startup.

  4. When charging a system with R-410A, the refrigerant cylinder should be held in which orientation?

    Answer: Upright for vapor, inverted for liquid

    R-410A must be charged as a liquid (cylinder inverted through a valve) to maintain the correct blend ratio.

  5. What does a TXV (thermostatic expansion valve) use to control refrigerant flow?

    Answer: Suction line superheat sensed by a bulb

    A TXV senses evaporator outlet superheat via a sensing bulb and adjusts flow to maintain a set superheat.

  6. What is the primary reason refrigerant recovery is required before opening a sealed refrigeration system?

    Answer: To comply with EPA Section 608 and prevent refrigerant release into the atmosphere

    EPA Section 608 prohibits knowingly venting refrigerants; recovery captures refrigerant before system access.