A/C and Refrigeration (AIR) at Northern Virginia Community College
Distance Learning
Time of Day
Term
- AIR 111 - Air Conditioning and Refrigeration Controls I
- Presents electron theory, magnetism, Ohm's Law, resistance, current flow, instruments for electrical measurement, A.C. motors, power distribution controls and their application. Part I of II.Lecture 1-2 hours. Laboratory 2-3 hours. Total 3-5 hours per week.
2-3 credits - AIR 121 - Air Conditioning and Refrigeration I
- Studies refrigeration theory, characteristics of refrigerants, temperature, and pressure, tools and equipment, soldering, brazing, refrigeration systems, system components, compressors, evaporators, metering devices. Presents charging and evaluation of systems and leak detection. Explores servicing the basic system. Explains use and care of oils and additives and troubleshooting of small commercial systems. Part I of II.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 122 - Air Conditioning and Refrigeration II
- Studies refrigeration theory, characteristics of refrigerants, temperature, and pressure, tools and equipment, soldering, brazing, refrigeration systems, system components, compressors, evaporators, metering devices. Presents charging and evaluation of systems and leak detection. Explores servicing the basic system. Explains use and care of oils and additives and troubleshooting of small commercial systems. Part II of II.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 134 - Circuits and Controls I
- Presents circuit diagrams for air conditioning units, reading and drawing of circuit diagrams, types of electrical controls. Includes analysis of air conditioning circuits, components, analysis and characteristics of circuits and controls, testing and servicing. Introduces electricity for air conditioning which includes circuit elements, direct current circuits and motors, single and three-phase circuits and motors, power distribution systems, and protective devices. Studies the electron and its behavior in passive and active circuits and components. Demonstrates electronic components and circuits as applied to air conditioning system. Part I of II.Lecture 2-3 hours. Laboratory 2-6 hours. Total 4-9 hours per week.
3-4 credits - AIR 154 - Heating Systems I
- Introduces types of fuels and their characteristics of combustion; types, components and characteristics of burners, and burner efficiency analyzers. Studies forced air heating systems including troubleshooting, preventive maintenance and servicing. Part I of II.Lecture 2-3 hours. Laboratory 2-6 hours. Total 4-8 hours per week.
3-4 credits - AIR 199 - Supervised Study
- Assigns problems for independent study incorporating previous instruction and supervised by the instructor.May be repeated for credit. Variable hours.
1-5 credits - AIR 205 - Hydronics and Zoning
- Presents installation, servicing, troubleshooting, and repair of hydronic systems for heating and cooling. Includes hot water and chilled water systems using forced circulation as the transfer medium.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 207 - Heat Loads and Psychrometrics
- Studies air and its properties, characteristics and measurements as they apply to human comfort. Considers control of temperature, humidity and distribution of air and air mixtures. Studies heat loss and heat gain factors. Considers the effect, the selection and layout of residential air conditioning and refrigeration systems.Lecture 3 hours. Laboratory 3 hours. Total 6 hours per week.
4 credits - AIR 213 - Air Conditioning and Refrigeration Controls III
- Introduces electrical, pneumatic and electronic control circuits as applied to year-round air conditioning systems. Includes reading wiring and schematic diagrams, troubleshooting, and designing high and low voltage control systems. Part I of II.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 231 - Circuits and Controls IV
- Applies controls and control circuits to air conditioning and refrigeration, including components, pilot devices and controls, and circuit diagrams.Lecture 3-4 hours. Laboratory 3 hours. Total 6-7 hours per week.
4-5 credits - AIR 232 - Circuits and Controls V
- Presents application and design of wiring and schematic diagrams of commercial refrigeration systems. Teaches fundamentals of operation and applications of pneumatic controls including basic pneumatic control circuits.Lecture 2 hours. Laboratory 3 hours. Total 5 hours per week.
3 credits - AIR 235 - Heat Pumps
- Studies theory and operation of reverse cycle refrigeration including supplementary heat as applied to heat pump systems, including service, installation and maintenance.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 238 - Advanced Troubleshooting and Service
- Presents advanced service techniques on wide variety of equipment used in refrigeration, air conditioning, and phases of heating and ventilation and controls.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 240 - Direct Digital Controls (DDC) I
- Studies the principles of direct digital controls. Presents common terms used within the HVAC control industry. Covers the function and operating characteristics of sensors, controllers, and final control devices. Highlights transfer function for a control devise and details the development of equations for typical control transfer functions.3 Credits. Lecture 2 hours. Laboratory 2 hours. Total 4 hours per week.
3 credits - AIR 251 - Air Conditioning Systems I
- Studies air conditioning, sizing selection, and application, servicing, repairing of coils and compressors. Includes troubleshooting the cooling system. Studies piping design and sizing, installation, condensers and water towers. Includes valves, strainers and accessories, duct systems and air distribution design and their relationship with volume, static pressure and velocity. Part I of II.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 252 - Air Conditioning Systems II
- Studies air conditioning, sizing selection, and application, servicing, repairing of coils and compressors. Includes troubleshooting the cooling system. Studies piping design and sizing, installation, condensers and water towers. Includes valves, strainers and accessories, duct systems and air distribution design and their relationship with volume, static pressure and velocity. Part II of II.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
3-4 credits - AIR 257 - Gas Fired Warm Air Furnaces
- Covers the study of mid and high efficiency gas-fired warm air furnaces and their components. Includes equipment components, installation, servicing and maintenance.Lecture 2-3 hours. Laboratory 2-3 hours. Total 4-6 hours per week.
Prerequisite: AIR 155.3-4 credits - AIR 276 - Refrigerant Usage EPA Certification
- Prepares HVAC technicians for a refrigerant certification test mandated by the Environmental Protection Agency (EPA). Reviews refrigerant recovery, recycle, and reclamation procedures for service work associated with air conditioning and refrigeration. Examines environmental impact including ozone depletion resulting from refrigeration utilization.Lecture 1-2 hours. Total 1-2 hours per week.
Students should have previous training and/or working knowledge of vapor-compression, common service equipment and procedures in HVAC/R.1-2 credits - AIR 297 - Cooperative Education
- Supervises in on-the-job training for pay in approved business, industrial and service firms, coordinated by the college's cooperative education office. Is applicable to all occupational- technical curricula at the discretion of the college.Credit/work ratio not to exceed 1:5 hours. May be repeated for credit. Variable hours.
1-6 credits - AIR 298 - Seminar and Project
- Requires completion of a project or research report related to the student's occupational objectives and a study of approaches to the selection and pursuit of career opportunities in the field.May be repeated for credit. Variable hours.
1-5 credits
