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OL GTE2 at-a-glance

This online course provides new technicians and people desiring a better understanding of electrical theory, components and troubleshooting as it applies in the HVAC industry. Topics covered include basic electrical theory, reading wiring diagrams, electrical meters, motors, electronic devices and electrical troubleshooting. This program consists of 9 modules and is available as each module or as a complete course. To receive FAD credit you must pass the final exam.

duration cost format register*
2 hrs per module $25/module
online Complete Course

*To register for individual modules, select the module from the list below and click 'Register'.


Course Overview

Servicing heating and air conditioning systems requires more than knowledge of mechanical system operation but also a very good understanding of electrical circuits and operation. This online training series provides the background to understand electrical circuits, the components used in them and how they function in heating and air conditioning systems. These modules are presented in simple language and concentrate on presenting the concepts in ways that can be easily understood by people new to the industry. After completing these modules, a student should possess the understanding of electrical circuits in air conditioning systems and basic electrical troubleshooting techniques. Each module is self-paced and contains a quiz and final exam for the section, each with reference to the appropriate section of the module, allowing students to evaluate their understanding of the concepts presented. The course includes section tests and a final exam. To receive FAD credit you must pass the module or final exam.

HVAC Training Objectives

Who Should Take This Training

This course is new technicians or others in the industry who wants to better understand electrical theory, components and troubleshooting of HVAC systems.

Training Methods Used

This course is a narrated online PowerPoint lecture with animations. Student’s achievement of the learning objectives is determined by successful completion of the module skill check and / or final online exam.

Course Details

Module 1 – Introduction to Electricity

Course Overview

Module 1 introduces the student to electrical terminology and basic concepts of electricity. This module is appropriate to students with limited knowledge of electricity and covers Ohm’s Law, power, series, and parallel circuits.

HVAC Training Objectives
  • Identify the basic sections of all electrical circuits
  • Properly use the basic electrical terms like voltage, current and resistance
  • Use Ohms law to calculate current, voltage and resistance
  • Calculate power
  • Properly show how to use an electrical meter to measure volts, amps and resistance
  • Use Ohms law to calculate voltage, current and power in series and parallel circuits
Topics Covered*
  • Terms and concepts (18)
  • Principles of Electricity (20)
  • Series and Parallel Circuits (21)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 2 – Electrical Components and Their Symbols

Course Overview

Module 2 introduces basic AC, magnetism, and common electrical components. It begins the coverage of wiring diagrams and their symbols by constructing a very basic circuit diagram.

HVAC Training Objectives
  • Identify the elements of a circuit as loads, power or control
  • Recognize how magentism is used in the control of electrical circuits
  • Identify by function and symbol, protective devices, transformers, compressors, heaters, relays, contactors and thermostats
Topics Covered*
  • Circuits (4)
  • Magnetism & components (10)
  • Common electrical components (10)
  • Circuits (28)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 3 – Wiring Diagrams

Course Overview

Module 3 discusses safety practices and introduces additional electrical components. A step-by-step construction of a simplified wiring diagram, covering power, control, and load circuits for a typical packaged air conditioner with electric heat, is developed.

HVAC Training Objectives
  • Identify the symbol and locate on a cooling wiring diagram switches, thermostats. Pressurestats, and overloads
  • Identify the symbol and locate on a heating diagram thermostats, limit switches, rollout switches, igniters and gas valves
  • Recognize the safety rules that apply to electrical troubleshooting
  • Identify the various types and sections of typical HVAC wiring diagrams
Topics Covered*
  • Cooling circuit diagrams (22)
  • Heating circuit diagrams (9)
  • Safety (6)
  • Circuit Diagrams (12)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 4 – Wiring Diagram Exercises

Course Overview

The fourth module covers step-by-step construction of a wiring diagram for a heat pump to teach more advanced diagram-reading skills and control circuit concepts.

Learning Objectives
  • Using wiring diagrams identify the operation of a heat pump unit in cooling, heating and defrost
  • Select the mode and function of heat pump components like reversing valve, supplemental heat and defrost board
  • Identify what is meant by thermal balance point
Topics Covered*
  • Heat pump function and operation (15)
  • Heat pump circuits (29)
  • Special heat pump controls (5)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 5 – Electric Meters and Their Uses


Module 5 discusses the construction of various types of meters and explains their applications. Sample problems illustrate the use of meters in electrical troubleshooting and testing.

Learning Objectives
  • Identify the types and use of ammeters for measuring current
  • Identify the types and use of voltmeters for measuring voltage
  • Identify the cautions and how to use an ohmmeter to measure resistance
  • Use the hopscotch method to troubleshoot an electrical circuit
  • Recognize how to use electrical meters to check a fuse and check for an open or shorted circuit
Topics Covered*
  • Meter operation (11)
  • Ammeters (10)
  • Voltmeters (6)
  • Ohmmeters (12)
  • Using meters (19)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 6 – Alternating Current Fundamentals


The sixth module expands on basic AC concepts covered in modules 1 and 2 as the basis for understanding AC motors and AC power. Also covered are the basic concepts of motors and generators, capacitors, phase shift, and power distribution systems.

Learning Objectives
  • Indicate how alternating current is different than direct current
  • Recognize the concepts associated with single and three phase
  • Identify how alternating current is used in relays, contactors, motors and transformers
  • Select what is meant by phase shift and how it impacts alternating current circuits
  • Identify the types of alternating current distribution systems
  • Select what is meant by phase imbalance
Topics Covered*
  • Alternating current and generation (10)
  • Alternating current characteristics (8)
  • Using alternating power to do work (19)
  • Alternating current distribution (16)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 7 – Motor Fundamentals and Motor Protection


Module 7 covers basic theory and operation of common single-phase and three-phase AC induction motors, including motor starting circuits. The module also describes the various types of protective devices used with motors.

Learning Objectives
  • Identify the components of alternating current induction motors and how they develop torque
  • Select how motor construction influences motor speed
  • Select reasons that a capacitor is used to improve motor torque
  • Identify the operation and diagrams for permeant split capacitor (PSC) and capacitor start single phase motors
  • Select what is meant by and types of stating kits used with single phase motors
  • Select the differences in operation of shade pole motors from capacitor controlled motors
  • Identify the delta and wye connections of 3-phase motors
  • Identify the types of motor protection and where these methods are applied
Topics Covered*
  • Induction motor principles (9)
  • Capacitor principles (9)
  • Single-phase motors (15)
  • Three-phase motors (5)
  • Motor protection (17)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 8 – Electronic Devices and Circuits


Module 8 discusses basic concepts, packaging, and troubleshooting of electronic circuits used in comfort air conditioning. The module covers semiconductors, timing and sensing devices, and the use of microprocessor controls in comfort applications.

Learning Objectives
  • Indicate how electronic circuits are different than electromagnetic circuits
  • Identify integrated circuit components like IC chip, transistor and semiconductor
  • Select what is meant by rectifiers and bridge circuits
  • Identify the function of an SCR, TRIAC, LED's and Varistors
  • Select the cautions to take to protect from static discharge when working on electronic circuits
  • Indicate the differences in thermistors as PTC or NTC
  • Select reasons to use electronic thermostats
  • Indicate how electronic control are used in controlling cycle operation like time delays and heat pump defrost
  • Recognize the operation of a stepper motor, and Electronically Commutated Motor (ECM)and where they are applied
  • Select methods to be used in troubleshooting electronic circuits
Topics Covered*
  • How electronic circuits are constructed (13)
  • Power supplies and power control circuits (13)
  • Temperature sensing and Temperature control (10)
  • Electronic cycle controls (7)
  • Microprocessor functions (6)
  • Electronic motor controls (15)
  • Troubleshooting electronic controls (5)
*All times are approximate and shown as (time in minutes).
Register for this Module

Module 9 – Electrical Troubleshooting


Module 9 describes and illustrates techniques for troubleshooting electrical and electronic circuits with a focus on control circuits and motors.

Learning Objectives
  • Select the steps to be used in troubleshooting and electrical circuit
  • Identify what aids should be used in troubleshooting and electrical circuit.
  • Use and example to troubleshoot an electrical circuit
  • Indicate the steps in the process of troubleshooting a motor
  • Use wiring diagrams to solve 3 troubleshooting exercises
Topics Covered*
  • Troubleshooting approach (7)
  • Troubleshooting guides (11)
  • Diagnosing and isolating faults (12)
  • Motor circuit testing (24)
  • Troubleshooting exercises (15)
*All times are approximate and shown as (time in minutes).
Register for this Module

Course Requirements

Completion Requirements

To receive a certificate for any module or for the complete course a student must receive a grade of 70% on the module skill check or final exam. Once you complete the exam you will be able to print a certificate.

Prerequisite requirements

Basic math skills are required to calculate electrical values in skill check problems.


This program is appropriate for anyone interested in a better understanding of the fundamentals of air conditioning systems.


This program uses a software program that uses flash animations and will run on most PC based computers. Some Apple and mobile devices may need a plugin / app to be able to run these programs.




Not applicable.

course HOURS

This course can be accessed 24/7 and is available for completion for 2 weeks after first login.


This program is located on the Carrier University Learning Management System. Access information and enrollment key are provided after registration.