HVACR Level 3 – ToolBox Trades Academy

HVACR Level 3

175h

Last Updated: May 18, 2026

HVACR Level 3

13 Sections
13 Lessons
175h Duration

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Control Circuit Troubleshooting

1 Lesson

Module ID 03317: Many problems that occur in HVACR systems are caused by a failure in the control circuits or in the electrical loads they serve. Technicians must understand how various control components function and interpret equipment schematics, wiring diagrams, and other service literature.

Motor Testing and Troubleshooting

1 Lesson

Module ID 03318: Motors are the workhorses in HVACR systems. Motors also represent the most significant electrical loads in most systems. As a technician, your ability to test and troubleshoot motors will play a significant role in your success. New technologies such as variable-frequency speed control and electronically commutated motors have improved system performance and efficiency, but these products also require a different approach to testing and troubleshooting.

Troubleshooting Cooling

1 Lesson

Module ID 03210: The refrigerant circuit is a closed-loop system, so identifying the source of a problem is not always easy. Because the operation of a refrigerant circuit is affected by external conditions, it can also be challenging to determine if a problem is inside the system or the result of an external influence.

Troubleshooting Heat Pumps

1 Lesson

Module ID 03311: This module reviews the operation of heat pumps and presents methods and procedures for their troubleshooting and repair.

Troubleshooting Gas Heating

1 Lesson

Module ID 03209: Gas furnaces have advanced a great deal in the last 25 years in the pursuit of safety and higher efficiency. Today’s furnaces are controlled by printed circuit boards that integrate the various safety controls with the operating and ignition controls. HVACR service technicians must understand how to test the various inputs and outputs to identify problems.

Troubleshooting Oil Heating

1 Lesson

Module ID 03310: Oil-fired furnaces and boilers are often used in homes in northern sections of the United States that have limited access to other reliable fuels. Oil-fired heating systems have provided reliable comfort to homes and businesses for many years, and are relatively simple to maintain and repair.

Troubleshooting Accessories

1 Lesson

Module ID 03312: HVAC systems, especially in cold, dry climates, are often equipped with humidifiers to maintain a healthy moisture level indoors. Electronic air cleaners may also be installed in both residential and commercial environments. Economizers, which take advantage of cool outside air to provide free cooling indoors, are common in commercial rooftop systems. Energy and heat recovery ventilators are another important indoor air quality (IAQ) accessory that are applied in both residential and commercial systems.

Sheet Metal Duct Systems

1 Lesson

Module ID 03213: HVAC ductwork can be made of sheet metal or fiberglass ductboard. Because the interior surfaces of sheet metal ducts are smooth, metal offers less resistance to airflow than fiberglass ductboard. However, in most cases, metal duct must be insulated to reduce noise transmission, minimize heat transfer, and prevent condensation.

Introduction to Hydronic Systems

1 Lesson

Module ID 03203: A hydronic system uses water as a medium to provide heating and cooling for comfort or processes. In hydronic comfort-heating systems, water travels from the boiler through pipes to terminal devices where the heat is transferred to the air.

Steam Systems

1 Lesson

Module ID 03306: Steam has a wide variety of uses in commercial and industrial sectors. It can carry large quantities of stored energy and be applied in comfort heating, process heating, and even power generation.

Fiberglass and Fabric Duct Systems

1 Lesson

Module ID 03214: Fiberglass ductboard has been applied successfully in both residential and commercial installations for many years. It is lightweight, easy to handle, and creates a very quiet air distribution system.

Retail Refrigeration Systems

1 Lesson

Module ID 03304: Retail refrigeration systems are found everywhere. Various refrigerated coolers, freezers, cases, and dispensers are used wherever food and beverages are served. Out of public view, much larger refrigeration systems protect stored products used to replenish the retail systems.

Zoning, Ductless, and Variable Refrigerant Flow Systems

1 Lesson

Module ID 03315: Installing a zoning system that distributes air throughout a conditioned space in a more controlled manner makes a standard HVAC system more effective. The popularity of zoning systems has dramatically increased over the years as a result. Ductless systems may be single zone or multizone, with both cooling-only and heat pump systems available. This module describes innovative approaches to comfort and prepares you to install and service the related systems.

HVACR, Level 3, is the third installment of a four-part HVACR curriculum. In Level 3 of the series, you’ll build competence in troubleshooting a range of HVAC issues, while mastering the inspection and installation of various types of refrigeration, hydronic and duct systems. By meeting HVAC Excellence accreditation standards, the curriculum will prepare you for success on HVAC Excellence certification exams.

The 6th Edition revision incorporates coverage of refrigeration, as well as the latest technology and equipment. New on-the-job case studies will prepare you for the scenarios you’ll encounter in the field. Plus, enhanced electrical safety content supports safe interaction with electrical systems, across HVACR functions.

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