HVAC Training – Course Curriculum

Theory

  • Define temperature
  • Describe molecular motion at absolute zero
  • Define the British thermal unit
  • Describe heat flow between substances of different temperatures
  • Explain the transfer of heat by conduction, convection, and radiation
  • Discuss sensible heat, latent heat, and specific heat
  • State atmospheric pressure at sea level and explain why it varies at different elevations
  • Describe the two types of barometers
  • Explain psig and psia as they apply to pressure measurements

Matter and Energy

  • Define Matter
  • List the three states in which matter is commonly found
  • Define density
  • Discuss Boyle’s Law
  • Discuss Dalton’s Law as it relates to the pressure of different gases
  • Define specific gravity and specific volume
  • State two forms of energy important to the air conditioning, heating and refrigeration industry
  • Define horsepower
  • Convert watts to British thermal units

Refrigeration and Refrigerants

  • Discuss applications for high, medium, and low-temperature refrigeration
  • Describe the meaning of ” one ton of refrigeration”
  • Describe the basic refrigeration cycle
  • Explain the relationship between vapor pressure and the boiling point of water or other liquids
  • Describe the function of the evaporator or cooling coil
  • Explain the purpose of the compressor
  • List the compressors normally used in residential and light commercial buildings
  • Discuss the function of the condensing coil
  • State the purpose of a metering device
  • List four characteristics to consider when choosing a refrigerant for a system

General Safety Practices

  • Describe proper procedures for working with each of the following: Pressurized systems and vessels, electrical energy, heat, cold, rotating machinery, and chemicals. For moving heavy objects. Utilizing proper ventilation.
  • How to work safely, avoiding safety hazards.

Tubing and Piping

  • List the different types of tubing used in heating, air conditioning, and refrigeration applications
  • Describe two common ways of cutting copper tubing
  • List procedures used for bending tubing
  • Discuss procedures used for soldering and brazing tubing
  • Describe two different methods for making flared joints
  • State the procedures for making swaged joints
  • Describe procedures for preparing and threading steel pipe ends
  • List four types of plastic pipe and describe uses for each

System Evacuation

  • Describe a standing pressure test
  • Choose a leak detector for a particular type of leak
  • Describe a deep vacuum
  • Describe two different types of evacuation
  • Describe two different types of vacuum measuring instruments
  • Choose a proper high-vacuum pump
  • List some of the proper evacuation practices
  • Describe a high-vacuum single evacuation
  • Describe a triple evacuation

System Charging

  • Describe how refrigerant is charged into systems, in the vapor and liquid states
  • Describe system charging using two different weighing methods
  • State the advantage of using electronic scales for weighing refrigerant into a system
  • Describe two types of charging devices
  • Charge refrigerant blends incorporating a temperature glide and fractionation potential
  • Charge fixed orifice, capillary tube, and piston air conditioning systems using charts and curves
  • Charge air conditioning equipment and heat pump systems incorporating a thermostatic expansion valve (TXV) as the metering device using the subcooling method of charging.
  • Use modern pressure/temperature charts incorporating dew point and bubble point values for calculating subcooling and superheat amounts
  •  Air Conditioning Troubleshooting
  • Select the correct instruments for checking an air conditioning unit with a mechanical problem
  • Calculate the correct operating suction pressure for both standard and high-efficiency air conditioning equipment under various conditions
  • Calculate the standard operating discharge pressure at various ambient conditions
  • Select the correct instruments needed to troubleshoot electrical problems in an air conditioning system
  • Use an ohmmeter to check the various components of the electrical system

Basic Electricity and Magnetism

  • Describe the structure of an atom
  • Identify atoms with a positive charge and atoms with a negative charge
  • Explain the characteristics that make certain materials good conductors
  • Describe how magnetism is used to make electricity
  • State the differences between alternating current and direct current
  • List the units of measurement for electricity
  • Explain the differences between series and parallel circuits
  • State Ohm’s Law
  • State the formula for determining electrical power
  • Describe a solenoid
  • Explain inductance
  • Describe the construction of a transformer and the way a current is induced in a secondary circuit
  • Describe how a capacitor works
  • Describe procedures for making electrical measurements

Introduction to Automatic Controls

  • Define bimetal
  • Make general comparisons between different bimetal applications
  • Describe the rod and tube
  • Describe fluid-filled controls
  • Describe partial liquid, partial vapor-filled controls
  • Distinguish between the bellows, diaphragm, and Bourdon tube
  • Discuss the thermocouple
  • Explain the thermistor

Automatic Control Components and Applications

  • Discuss space temperature control
  • Describe the mercury control bulb
  • Describe system overshoot and temperature swing
  • Describe the difference between low and high voltage controls
  • Name components of low and high voltage controls
  • Name two ways motors are protected from high temperature
  • Describe the difference between a diaphragm and a bellows control
  • State the uses of pressure-sensitive controls
  • Describe a high-pressure control
  • Describe a low-pressure control
  • Discuss the range and differential of a control
  • Describe pressure transducers
  • Describe a pressure relief valve
  • Describe the functions of mechanical and electromechanical controls

Troubleshooting Basic Controls

  • Describe how a voltmeter is used to troubleshoot electrical circuits
  • Identify some typical problems in an electrical circuit
  • Describe how an ammeter is used to troubleshoot an electrical circuit
  • Recognize the components in a heat-cool electrical circuit
  • Follow the sequence of events in a heat-cool electrical circuit

Types of Electric Motors

  • In HVAC training Describe the different types of open single-phase motors used to drive fans, compressors, and pumps
  • Describe the applications of the various types of motors
  • State which motors have higher starting torque
  • List the components that cause a motor to have a higher starting torque
  • Describe a multi-speed permanent split-capacitor motor and indicate how the different speeds are obtained
  • Explain the operation of a three-phase motor
  • Describe a motor used for a hermetic compressor
  • Explain the motor terminal connections in various compressors
  • Describe the different types of compressors that use hermetic motors
  • Describe the use of variable-speed motors

Application of Motors and Motor Controls

  • In HVAC training Identify the proper power supply for a motor
  • Describe the application of three-phase versus single-phase motors
  • Describe other motor applications
  • Explain how the noise level in a motor can be isolated from a conditioned space
  • Describe the different types of motor mounts
  • Identify the various types of motor drive mechanisms
  • Describe the differences between a relay, a contractor, and a starter
  • State how the locked-rotor current of a motor affects the choice of a motor starter
  • List the basic components of a contactor and starter
  • Compare two types of external motor overload protection
  • Describe conditions that must be considered when resetting safety devices to restart electric motors

Troubleshooting Electric Motors

  • Describe different types of electric motor problems
  • List common electrical problems in electric motors
  • Identify various mechanical problems in electric motors
  • Describe a capacitor checkout procedure
  • Explain the difference in troubleshooting a hermetic motor problem and an open motor problem

Typical Operating Conditions (Air Conditioning)

  • In HVAC training Explain what conditions will vary the evaporator pressures and temperatures
  • Define how the various conditions in the evaporator and ambient air affect condenser performance
  • State the relationship of the evaporator to the rest of the system
  • Describe the relationship of the condenser to the total system performance
  • Compare high-efficiency equipment and standard-efficiency equipment
  • Establish reference points when working on unfamiliar equipment to know what typical conditions should be
  • Describe how humidity affects equipment suction and discharge pressure
  • Explain the three methods that manufacturers use to make air-conditioning equipment more efficient

Troubleshooting

  • Select the correct instruments for checking an air conditioning unit with a mechanical problem
  • Calculate the correct operating suction pressure for both standard and high-efficiency air conditioning equipment under various conditions
  • Calculate the standard operating discharge pressure at various ambient conditions
  • Select the correct instruments to troubleshoot electrical problems in an air conditioning system
  • Use an ohmmeter to check the various components of the electrical system

Air Source Heat Pumps

  • In HVAC training describe a reverse-cycle heat pump
  • List the components of a reverse-cycle heat pump
  • Explain the four-way valve (reversing valve)
  • State the various heat sources for heat pumps
  • State how heat pump efficiency is rated
  • Determine by the line temperature whether a heat pump is in cooling or heating
  • Discuss the terminology of heat pump components
  • Define coefficient of performance
  • Describe the control sequence of an air-to-air heat pump
  • Describe the techniques being used to improve the efficiency of heat pump performance
  • Discuss the recommended preventive maintenance

Ron Walker
Ron Walker

After retiring from the U.S. Marines and achieving his B.S. degree, Ron Walker entered the HVAC field. He has been an HVAC technician, service manager, and business owner. Working as a service manager, he spent many years training HVAC technicians to be more technically competent and really understand their trade. His passion for teaching and helping others resulted in the creation of HVAC Training Solutions, LLC.