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NATE HVAC Certification Master Study Tool

Core + Specialty Review • Flashcards • Randomized Exam Simulation

Study Guide
Flashcards
Quiz

NATE Core – Safety & Fundamentals

Safety & Regulations +

EPA 608 Types I, II, III, Universal
Refrigerant recovery procedures
Lockout/Tagout (LOTO)
PPE requirements
Combustion safety & CO testing
Refrigerant cylinder handling

Basic Science & Thermodynamics +

Heat transfer: Conduction, Convection, Radiation
Sensible vs Latent heat
BTU definition
Pressure-Temperature relationship
Superheat calculation
Subcooling calculation
Enthalpy concept
Psychrometric chart fundamentals

Tools & Measurements +

Digital manifold gauges
Manometers (static pressure)
Clamp meters & multimeters
Psychrometer (wet bulb / dry bulb)
Micron gauge & evacuation procedures
Combustion analyzer

NATE Specialty – Air Conditioning

Refrigeration Cycle Deep Dive +

Compressor types: Scroll, Reciprocating, Screw
Evaporator function & load absorption
Condenser heat rejection
Metering devices: TXV, Piston, Cap Tube
Suction vs Liquid line analysis
Flash gas issues
Floodback & slugging risks

Charging & Diagnostics +

Fixed orifice charging (superheat method)
TXV charging (subcooling method)
High superheat causes
High subcooling causes
Low suction pressure diagnosis
High head pressure diagnosis
Airflow-related refrigeration faults

Electrical Diagnostics +

Ohm’s Law (V = I × R)
Voltage drop testing
Capacitor testing (microfarads)
Contactor & relay troubleshooting
Single vs Three-phase systems
ECM vs PSC motors
Reading ladder diagrams

NATE Specialty – Heat Pumps

Heat Pump Operation +

Reversing valve operation
Heating vs Cooling mode pressures
Balance point concept
Auxiliary heat staging
Defrost control strategies

Airflow & System Performance +

Manual J load calculation overview
Manual D duct design
Static pressure testing
CFM per ton rule (approx 400 CFM/ton)
Duct leakage impacts
Air balancing procedures

Installation & Commissioning +

Proper evacuation to 500 microns
Nitrogen pressure testing
Line set sizing
Proper airflow verification
Temperature split verification (16–22°F typical)
System startup checklist