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Air Conditioning 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 Air Conditioning flashcards as text

  1. A technician finds that a TXV (thermostatic expansion valve) bulb has lost its charge. What symptom would this most likely cause?

    Answer: Low suction pressure and starved evaporator

    A TXV with a lost bulb charge will default to a closed or very restricted position, starving the evaporator and resulting in low suction pressure and low superheat at the bulb location.

  2. What is the purpose of the reversing valve in a heat pump system?

    Answer: Reverse the direction of refrigerant flow to switch between heating and cooling modes

    The reversing (four-way) valve switches refrigerant flow direction so the outdoor coil can act as an evaporator in cooling mode and a condenser in heating mode.

  3. Which term describes the process of refrigerant absorbing heat and changing from liquid to vapor in the evaporator?

    Answer: Evaporation (vaporization)

    Evaporation (or vaporization) is the process by which liquid refrigerant absorbs latent heat from the surroundings and changes to a vapor inside the evaporator coil.

  4. What SEER rating is required for new central air conditioners sold in the southeastern United States as of 2023?

    Answer: 15 SEER (SEER2)

    As of January 1, 2023, new AC systems sold in the Southeast and Southwest U.S. must meet a minimum of 15 SEER (or the updated SEER2 equivalent).

  5. A capacitor in an air conditioning system serves what primary purpose?

    Answer: Provide starting torque and improve running efficiency of motors

    Capacitors store electrical charge to provide the phase shift needed for starting single-phase motors (start capacitors) and to improve running efficiency (run capacitors).

  6. What does 'latent heat' refer to in HVAC applications?

    Answer: Heat absorbed or released during a phase change without a temperature change

    Latent heat is the heat energy absorbed or released when a substance changes phase (e.g., liquid to vapor) without any change in temperature.

  7. When recovering refrigerant from a system, the technician must use EPA-approved recovery equipment if the system contains more than how much refrigerant?

    Answer: Any amount — recovery equipment is always required

    Under EPA Section 608, certified technicians must use approved recovery equipment when servicing any appliance that uses a regulated refrigerant, regardless of charge size.