The Refrigeration Cycle

Course: ATS 431
Description: Introduces the basic concepts needed for an understanding of refrigeration. Traces the basic refrigeration cycle. Explains the concepts of heat, temperature, humidity, dewpoint, enthalpy, and simple psychrometrics. Concludes with a lesson on the tools and instruments needed for refrigeration servicing and safe work practices.
Duration: 2.5 days

Refrigerants and Refrigerant Oils

Course: ATS 432
Description: Covers the physical properties of refrigerants, including pressure-temperature relationships. Discusses various kinds of refrigerant and their safe handling. Examines the effects of refrigerants on the atmosphere and related EPA requirements. Discusses filters, driers, leak detection equipment, gauge manifold set. Explains system charging, evacuation and dehydration, refrigerant.
Duration: 3.5 days


Course: ATS 433
Description: Explains the function of the compressor in a refrigeration system. Introduces information on the construction and use of reciprocating, rotary, helical, scroll, and centrifugal compressors. Covers compressor motors, control, and protection. Concludes with a lesson on preventive maintenance for compressors as well as troubleshooting and repair.
Duration: 3.5 days

Evaporators and Metering Devices

Course: ATS 434
Description: Explains the function and construction of evaporators. Covers direct-expansion, dry-expansion, and flooded evaporators, as well as systems using multiple evaporators. Discusses ways to boost evaporator performance. Explains evaporator defrosting, maintenance, and troubleshooting. Describes the function, operation, and maintenance of various metering devices, including hand-operated, automatic, thermostatic, thermal-electric devices.
Duration: 2.5 days

Condensers and Cooling Towers

Course: ATS 435
Description: Covers the function, construction, and operation of both air- and water-cooled condensers and related devices. Discusses cooling towers and spray ponds, including maintenance and troubleshooting. Includes a lesson on evaporative condensers. Concludes with a discussion of water-related problems and how to solve them.
Duration: 2.5 days


Course: ATS 436
Description: Examines piping system materials and sizing. Includes coverage of codes, valves and fittings, and the cutting and joining of piping and tubing. Explains the function and unique requirements of the discharge line, liquid line, and suction line. Concludes with a lesson on piping system maintenance, including handling dirt and scale, expansion, vibration, corrosion, and leaks.
Duration: 2.5 days

Control Systems

Course: ATS 437
Description: Introduces the need for control, control methods, and system basics. Includes information on self-powered, pneumatic, hydraulic, electric, and electronic systems. Covers various sensors and controlled devices. Covers the basics of two-position, floating, and proportional control systems and their maintenance and troubleshooting. Discusses the various processes requiring control in a refrigeration or air-conditioning system.
Duration: 2.5 days

Air-Handling Systems

Course: ATS 438
Description: Begins with coverage of airflow basics, including how air moves, types of airflow, and pressure relationships. Compares and contrasts various types of fans and fan motors. Examines types of ducts, fittings, connections, insulation, and terminal devices. Covers various methods of cleaning and filtering air, as well as balancing and troubleshooting the air-handling system. Concludes with a lesson on indoor air quality and sick building syndrome.
Duration: 3 days

Absorption Chillers

Course: ATS 439
Description: Covers the basic principles of absorption refrigeration as compared to mechanical refrigeration. Introduces absorption terminology and common absorption fluid pairs. Examines water/lithium bromide systems, ammonia/water systems, and evolving systems. Concludes with a discussion of chiller selection factors, cost of operation, and absorption system applications.
Duration: 3 days

Heat Pumps

Course: ATS 441
Description: Introduces the heat pump concept and related terminology. Covers water-to-water, water-to-air, ground-to-air, air-to-air, solar-assisted, geothermal, dual- fuel, and split systems, as well as packaged units. Defines balance points, coefficient of performance, energy efficiency ratio, and degree days. Covers components, controls, installation, checkout, and startup.
Duration: 3.5 days

Heating System Basics

Course: ATS 442
Description: Covers fundamental information on all types of heating systems. Begins with the concept of heat energy, heat transfer, and temperature scales. Examines factors affecting human comfort. Introduces all types of heating equipment and its operation. Includes a Lesson on combustion and thermal efficiency. Concludes with a lesson on duct systems.
Duration: 2.5 days

Heating System Equipment

Course: ATS 443
Description: Covers the hardware associated with heating systems, including gas and oil furnaces, electric systems, solid-fuel and hydronic systems, and finally some alternative systems (solar heating, heat pumps, and fuel cells). Includes a discussion of furnace performance criteria, return air systems, and the importance of filters.
Duration: 3 days
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