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NCCER Certification HVAC (Heating, Ventilation, and Air Conditioning) Syllabus

The HVAC (Heating, Ventilation, and Air Conditioning) syllabus for NCCER Certification in full: 4 chapters, 12 topics and 13 sub-topics, every one listed below, plus 52 HVAC (Heating, Ventilation, and Air Conditioning) flashcards with answers.

4Chapters
12Topics
13Sub-topics
52Flashcards

HVAC (Heating, Ventilation, and Air Conditioning) syllabus: all 4 chapters

Expand any chapter to see its topics and sub-topics.

  1. HVAC Fundamentals and Safety

     3 topics
    • Principles of Heat and Refrigeration
      • Heat transfer, latent and sensible heat
      • The refrigeration cycle
      • Pressure-temperature relationships
    • HVAC Safety and EPA 608
      • Refrigerant handling and recovery
      • Section 608 certification requirements
    • Tools and Instruments for HVAC

  2. Refrigeration and Air Conditioning Systems

     3 topics
    • System Components
      • Compressors, condensers, evaporators, and metering devices
      • Refrigerant types and applications
    • Charging, Evacuation, and Leak Detection
    • Troubleshooting Refrigeration Circuits

  3. Heating Systems

     3 topics
    • Gas and Oil Heating
      • Furnace components and combustion
      • Venting and combustion air
    • Electric Heat and Heat Pumps
    • Hydronic Heating Basics

  4. Air Distribution and Controls

     3 topics
    • Air Distribution Systems
      • Duct design, sizing, and fabrication
      • Airflow measurement and balancing
    • HVAC Controls
      • Thermostats and control circuits
      • Electrical components and wiring diagrams
    • Indoor Air Quality and Ventilation

NCCER Certification HVAC (Heating, Ventilation, and Air Conditioning) flashcards — 52 questions with answers

  1. In refrigeration, what is the difference between sensible heat and latent heat?

    Sensible heat changes a substance's temperature with no change of state; latent heat changes the state (e.g., evaporating or condensing) at constant temperature.

  2. Define a British Thermal Unit (BTU).

    The amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit (at sea level).

  3. What is the latent heat of vaporization of water at atmospheric pressure?

    Approximately 970 BTU per pound.

  4. How many BTU/hr equal one ton of refrigeration?

    12,000 BTU/hr (the heat needed to melt one ton of ice in 24 hours).

  5. State the formula for converting Fahrenheit to Celsius.

    C = (F - 32) x 5/9.

  6. What are the four components that make up the basic vapor-compression refrigeration cycle, in order?

    Compressor, condenser, metering device (expansion valve), and evaporator.

  7. In the refrigeration cycle, what happens to the refrigerant in the evaporator?

    It absorbs heat from the conditioned space and boils/evaporates from a low-pressure liquid into a low-pressure vapor.

  8. In the refrigeration cycle, what is the function of the condenser?

    It rejects heat from the high-pressure refrigerant vapor, causing it to condense into a high-pressure liquid.

  9. What is superheat?

    The number of degrees a vapor is heated above its saturation (boiling) temperature at a given pressure.

  10. What is subcooling?

    The number of degrees a liquid is cooled below its saturation (condensing) temperature at a given pressure.

  11. Under EPA Section 608, what are the four technician certification types?

    Type I (small appliances), Type II (high-pressure systems), Type III (low-pressure systems), and Universal (all types).

  12. What does the EPA Section 608 regulation prohibit?

    The knowing venting (release) of CFC, HCFC, and HFC refrigerants to the atmosphere during service, maintenance, repair, or disposal.

  13. Which refrigerant property makes ozone depletion potential (ODP) a concern, and which refrigerant class is being phased out for it?

    Chlorine content damages the ozone layer; CFCs (already banned) and HCFCs (e.g., R-22) are being phased out.

  14. What PPE is required when handling refrigerant to prevent frostbite and eye injury?

    Safety glasses/goggles and gloves, because liquid refrigerant can cause frostbite and eye damage on contact.

  15. Why must you never use oxygen or compressed air to pressure-test a system containing refrigerant oil?

    Mixing oxygen or high-pressure air with oil can cause an explosion; nitrogen (an inert gas) must be used instead.

  16. What instrument set is used to read system high-side and low-side pressures and is the primary HVAC service tool?

    The refrigeration manifold gauge set (gauge manifold).

  17. On a gauge manifold, what color hose connects to the low side and what color to the high side?

    Blue hose for the low (suction) side and red hose for the high (discharge) side; yellow is the center/utility hose.

  18. What tool measures the moisture/non-condensable removal during evacuation by reading deep vacuum in microns?

    A micron gauge (electronic vacuum gauge).

  19. What instrument is used to measure superheat and subcooling temperatures on suction and liquid lines?

    A clamp/pipe thermometer or thermocouple temperature probe.

  20. What meter measures voltage, amperage, and resistance for electrical troubleshooting in HVAC?

    A multimeter (a clamp-on ammeter is used for measuring current).

Show the other 32 HVAC (Heating, Ventilation, and Air Conditioning) flashcards

  1. What is the function of the metering device (TXV or fixed orifice) in a refrigeration system?

    It creates a pressure drop, metering liquid refrigerant into the evaporator and dividing the high side from the low side.

  2. How does a thermostatic expansion valve (TXV) control refrigerant flow?

    It modulates flow to maintain a constant superheat at the evaporator outlet, using a sensing bulb on the suction line.

  3. What is the purpose of a filter-drier in a refrigeration circuit?

    It removes moisture and filters out particulates and contaminants from the refrigerant.

  4. What is the purpose of an accumulator, and where is it located?

    It is on the suction line before the compressor to prevent liquid refrigerant slugging by allowing only vapor to return to the compressor.

  5. What component is the 'heart' of the system that raises refrigerant pressure and circulates it?

    The compressor.

  6. Name three common compressor designs used in HVAC.

    Reciprocating, scroll, and rotary (also screw and centrifugal in larger systems).

  7. Why must a system be evacuated (pulled into a deep vacuum) before charging?

    To remove moisture and non-condensable gases (air), which cause acid formation, high head pressure, and reduced efficiency.

  8. What micron level is a common target for a properly evacuated residential system?

    500 microns or below, with the system holding the vacuum (no rise) after isolation.

  9. What is the preferred method of charging a system that uses a blended (zeotropic) refrigerant like R-410A?

    Charge as a liquid (inverting the cylinder), metering it so it does not slug the compressor, to keep the blend in correct proportion.

  10. Name three common methods of leak detection in a refrigeration system.

    Electronic leak detector, soap bubble solution, and ultraviolet (UV) dye with a UV light (also nitrogen pressure test).

  11. What does a high superheat reading combined with low suction pressure typically indicate?

    An undercharged system or a restriction/starved evaporator (insufficient refrigerant reaching the evaporator).

  12. What does low superheat with high suction pressure typically indicate?

    An overcharged system or a flooded evaporator (too much refrigerant).

  13. What does abnormally high head (discharge) pressure usually indicate?

    Overcharge, a dirty/blocked condenser, non-condensables in the system, or a failing condenser fan.

  14. What does low head pressure and low suction pressure together commonly indicate?

    An undercharge (low refrigerant) or a restriction in the metering device/liquid line.

  15. In a gas furnace, what safety device proves the burner flame is present before allowing gas to keep flowing?

    The flame sensor (flame rectification) or, in older units, a thermocouple/pilot safety.

  16. What is the sequence of operation start for a standing-pilot/electronic-ignition gas furnace once the thermostat calls for heat?

    Inducer/draft motor starts and proves pressure, igniter heats, gas valve opens, flame is sensed, then the blower starts after a delay.

  17. What device on a gas furnace proves proper venting/draft before the gas valve opens?

    The pressure switch (proving the induced-draft/inducer motor airflow).

  18. What is the function of the heat exchanger in a gas or oil furnace?

    It transfers heat from combustion gases to the circulating air while keeping flue gases (like CO) separated from the conditioned air.

  19. In an oil burner, what creates the high-pressure fuel spray and ignition?

    A fuel pump and nozzle atomize the oil, and a high-voltage transformer creates a spark across electrodes to ignite it.

  20. What is the basic operating principle of electric resistance heat?

    Current passes through high-resistance heating elements (nichrome wire) that convert electrical energy directly into heat.

  21. How does a heat pump differ from a standard air conditioner?

    A heat pump has a reversing valve, allowing it to move heat in both directions so it can heat in winter and cool in summer.

  22. What component in a heat pump changes the system between heating and cooling modes?

    The reversing valve (four-way valve).

  23. On a heat pump in heating mode, what is the outdoor coil and the indoor coil acting as?

    The outdoor coil acts as the evaporator (absorbing heat) and the indoor coil acts as the condenser (releasing heat).

  24. What is auxiliary (supplemental) heat on a heat pump and when does it run?

    Backup electric resistance or fossil-fuel heat that runs when the heat pump alone cannot meet demand or during defrost in cold weather.

  25. In a hydronic heating system, what fluid carries the heat and what device moves it?

    Heated water (or water/glycol) carries the heat, and a circulator pump moves it through the loop.

  26. What hydronic device allows expansion of heated water to prevent excessive pressure?

    The expansion (compression) tank.

  27. What are the two basic duct system layouts for air distribution?

    Supply (delivering conditioned air) and return (carrying air back); common designs include trunk-and-branch, radial, and perimeter loop.

  28. What instrument measures static pressure in a duct system, and what does excessive static pressure indicate?

    A manometer (or Magnehelic gauge); high static pressure indicates restricted airflow from dirty filters, undersized ducts, or closed dampers.

  29. What is the difference between a low-voltage control circuit and the line-voltage circuit in residential HVAC?

    The line-voltage circuit (120/240V) powers motors and elements; the low-voltage circuit (24V, via a transformer) powers the thermostat and controls.

  30. What do the standard thermostat terminals R, C, G, W, and Y control?

    R = 24V power, C = common, G = indoor blower fan, W = heating, Y = cooling (compressor).

  31. What is MERV rating and what does a higher number mean for an air filter?

    Minimum Efficiency Reporting Value; a higher MERV means the filter captures smaller particles more efficiently.

  32. What does ventilation accomplish for indoor air quality, and what device recovers energy while ventilating?

    It introduces fresh outdoor air to dilute indoor contaminants; an ERV (energy recovery ventilator) or HRV transfers heat/moisture between exhaust and intake air to save energy.

NCCER Certification HVAC (Heating, Ventilation, and Air Conditioning) FAQ

What is in the NCCER Certification HVAC (Heating, Ventilation, and Air Conditioning) syllabus?

NCCER Certification HVAC (Heating, Ventilation, and Air Conditioning) is split into 4 chapters: HVAC Fundamentals and Safety, Refrigeration and Air Conditioning Systems, Heating Systems and Air Distribution and Controls. Together they contain 12 topics and 13 sub-topics.

How many chapters are in NCCER Certification HVAC (Heating, Ventilation, and Air Conditioning)?

4 chapters, containing 12 topics and 13 sub-topics. The largest chapter is HVAC Fundamentals and Safety, with 3 topics.

Are there flashcards for NCCER Certification HVAC (Heating, Ventilation, and Air Conditioning)?

Yes — a 52-card HVAC (Heating, Ventilation, and Air Conditioning) deck, printed in full in the flashcards section of this page and available in the Examius app with spaced repetition. The free plan covers one exam of your choice, including its flashcards; Examius Pro, a one-time purchase, unlocks every other exam and deck.