What You'll Learn
Our HVAC online training consists of 19 specialized lessons and once you graduate, you’ll be set up to take the EPA Section 608 certification exam. Successful completion of this exam will satisfy the federal government’s refrigerant handling qualifications applicable to residential and commercial air conditioner technicians.
Your lessons guide you from fundamental concepts to more challenging, hands-on skills. Practical review exercises help reinforce key topics, including how to...
- Install and troubleshoot valves, compressors, water chillers, thermostats and heat pumps
- Fix defective connections, controls and switches
- Adjust refrigerant levels
- Work with gas, oil and electric heat
- Apply successful soldering and brazing techniques
Lesson 1: Hand Tools and Fasteners
Lesson 2: Tubing and Pipe
Essential HVAC hand tools—their uses and advantages; screw types and sizes; using bolts, nuts, washers, anchors, setscrews, bind rivets, and threaded rods; caring for tools.
Lesson 3: Soldering, Brazing and Flame-Cutting
Types and sizes of copper tubing and fittings; cutting, bending, and flaring; swaged and flared connections; using steel and plastic pipe; pipe fittings and tools; repairing pipe leaks; how to solvent-weld rigid plastic pipe.
Lesson 4: Math for Technicians
Soldering vs. brazing; selecting proper alloys and fluxes; soldering safely and correctly; air-fuel torches and gas cylinders; connecting and operating pressure regulators; air-fuel brazing and the brazing process; selecting appropriate cylinders and torches; oxyacetylene equipment for brazing and cutting metal; safety procedures.
Lesson 5: Thermodynamics, Temperature and Pressure
Place values; fractions; decimals; two- and three-dimensional linear measurements; Fahrenheit vs. Celsius temperature; area; volume; computing percentages easily.
Lesson 6: The Refrigerant System Cycle
How heat is transferred; sensible, specific, and latent heat; BTU's; saturated conditions; superheat; subcooling; measuring refrigeration and pressure; the compound gauge; Boyle's and Charles' Laws.
Lesson 7: Refrigerants and Their Recovery
The refrigeration cycle; domestic and commercial refrigeration system components; valves; variations in accessory components; the gauge manifold.
Lesson 8: Refrigerant Blends and Troubleshooting
Refrigerant types and applications; using temperature-pressure charts; determining superheat; pumping ratio problems; safety precautions; ozone layer depletion; complying with the Federal Clean Air Act; recovery and recycling methods.
Lesson 9: Refrigerant Controls
Fractionation; bubble point; dew point; temperature glide; interpreting a temperature-pressure card for blends; selecting lubricants; performing a system retrofit to a blend; refrigerant contamination problems; detecting leaks; using refrigerant cylinders; correcting pressure problems; charging a system.
Lesson 10: Valves, Troubleshooting Flow Controls
Installing and adjusting automatic and thermostatic expansion valves and capillary tubes; when and how to use equalized valves; multiplexed evaporator operations.
Lesson 11: Compressors and Their Lubrication
Hand and check valves; installing and troubleshooting solenoid, EPR, and CPR valves; how to install and adjust head pressure control and hot gas bypass valves; diagnosing and repairing AEV and TEV system problems; correcting EPR and CPR valve problems.
Lesson 12: Water Chillers
Compressor types and designs; compliant scroll compressors and disc-type valve designs; reciprocating compressors; aligning pulleys and flywheels; how to select, size, and replace V-belts; adding and removing oil; controlling liquid migration; vibration eliminators; the compressor data plate.
Lesson 13: Basic Electricity
Vapor compression, centrifugal, low pressure, and absorption chiller operation; open- and closed-loop systems; ammonia and lithium bromide absorption cycles; refrigerant leaks.
Lesson 14: Electrical Circuits and Motors
Using the voltmeter, ammeter, and ohmmeter; Ohm's Law; open and short circuits; wire sizes; using the right insulation for conductors; connecting loads and switches; using and installing plugs, receptacles, and switches; using portable power tools.
Lesson 15: Solenoids, Relays and Motor Controls
How electrical power is transmitted; transformers explained; overcurrent; circuit protection devices; ground fault circuit interrupters; single- and three-phase motors; multi-speed motors; dual-voltage motors; induction motors; motor connections; capacitors; transformers; compressor terminals; fans and blowers; motor bearings.
Lesson 16: Defrost Cycles
Electromagnetic control devices; solenoid valves; relays; connecting and troubleshooting contactors and line starters; reading diagrams; adjusting and troubleshooting motor controls and thermostats; adjusting pumpdown cycles and safety controls.
Lesson 17: Gas and Oil Heat With Air Conditioning
Installing and adjusting time clocks; defrost cycles; connecting and troubleshooting defrost terminator thermostats; temperature and pressure termination adjustment.
Lesson 18: Electric Heat With Air Conditioning and Heat Pumps
Gas heat system components; adjusting burner flames, fan/limit controls, and heat anticipators; wiring heating and cooling system components; combustion; setting the electrodes; the primary control; the flame safeguard; stack control; oil furnace problems.
Lesson 19: Customer Relations and Your Career
Components of electric heating systems; wiring connections; two-stage heating systems; isolating low-voltage control circuits from line-voltage circuits; how heat pumps work.
Striving for excellence in customer service; secrets of establishing good customer relations; learning and using customers' names; shaking hands; your appearance; how to begin and end service calls; certification and licensing requirements for technicians.
Close Curriculum Details
What You Get
Begin our HVAC online training on your terms. Study at your own pace and get assistance when you need it. We’ve removed the obstacles so you can move ahead fast!
Air conditioning training courses at Ashworth College make the subject come alive. Your tuition covers:
- Comprehensive HVAC lesson book and study guides
- Starter set of tools
- Digital multimeter (Graduation Gift)
- Online open-book exams
- A 12-page EPA Section 608 study guide issued by the ESCO Institute ($12.95 value)
- After you graduate: A $75 voucher that will cover all or some of the cost of writing the core section as well as sections 1,2 and 3 of the EPA Section 608 Certification exam at the ESCO Institute proctored location nearest you.
- Participation in the Student Community
- Career Services powered by CareerBuilder®
Graduates of our HVAC online training receive a personalized diploma and may attend our annual graduation ceremony. You’ll be ready to move forward in the HVAC profession, whether you want to start as an apprentice, work for a franchise or start your own business.
We’ve cleared the way. Start your air conditioning training courses today. Speak with an Admissions Advisor at 1-800-957-5412 or enroll online now.