Instructional DVDs by Subject

A 1989 videocassette from Lennox Industries. Includes an accompanying guide.

Bill Shaffer explains the purpose of a reversing valve in a heat pump system and describes troubleshooting and replacement procedures.

Program provides air conditioning simulation experiences in normal operations in different climates, charge adjustments, compression ratio, condenser and evaporator capacity calculations, and extreme subcooling designs.

Students aiming for a career in air conditioning repair and technology will encounter all the essentials in this program, which summarizes the ins and outs of operation and service. Typical systems for cooling or dehumidifying residential environments are covered. Details on condensing units and their components--including the condenser coil, compressor, motor, fan, and accumulator--are illustrated along with typical outside housings and insulation materials. The three methods of heat transfer--conduction, convection, and radiation--are outlined, along with the difference between high side and low side pressure systems. The refrigeration cycle is demonstrated, as are different types of compressors, such as scroll, reciprocating, and piston. Heat pumps, electrical controls, evaporators, and sight glasses are explained.

The program illustrates several different types of heating systems, including forced-air gas furnaces, high-efficiency furnaces, and hot air systems. Different types of ignition and fuels are covered, along with the major elements of gas furnaces, including solenoids, burners, manifolds, heat exchangers, and more. Air flow components such as supply and return plenums, air filters, and split capacitor motors are also explained, in addition to thermostats, pilot safety switches, and gas valves. Viewers will get a look at the automated service centers at the heart of many modern large office buildings, which maintain climate control using high-tech sensors and adjustment systems

This presentation explains the basics of modern heating systems and their components when installed in a residence. User's guide includes study objectives and a short quiz with answers.

Explains process to follow for troubleshooting thermal expansion valves, also known as TEV's.

Shows how to correct common furnace problems including pilot light malfunctions, limit switch cycling, indoor comfort problems, draft safeguard switch tripping, furnace and vent system corrosion, and unique problems of condensing furnaces.

Discusses preliminary inspection, insufficient air, improper defrost, excessive electrical consumption, proper refrigerant charge, and special components.

Contents: Presentation contents: Introduction -- Water source heat pump unit operation -- Water source heat pump system operation -- System advantages and disadvantages -- Product overview -- System overview -- System application topics -- Geothermal systems -- Codes and standards -- System sizing and layout tips -- System controls -- Summary.