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
- 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
- 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
- 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.
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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