In our online automotive hvac essentials certificate program, youll take hvac classes and learn automotive engine heating and cooling systems, airconditioning systems basics, rules, epa regulations, and safety practices for working with refrigerants, and how to troubleshoot techniques of automotive heating and airconditioning assemblies. This makes understanding how your system works just a bit easier, especially if you imagine your much larger system in your house. During routine maintenance on 18feb2020 between 11. To get the best out of your air conditioning, you have to keep every window and door closed. In addition, there is the refrigerant that flows through this system. There are two basic types of automotive air conditioning systems. Your car is in good hands with these expert auto technicians, and they will examine your cars ac system to see if there is a leak and if there is, theyll stop it in their tracks before it can. Pdf motor vehicle mechanic free ebooks download free. This is known as the law of heat transfer, and is the basis of air conditioning operation. This basic technology introduction will be presented together with the introduction of the latest technology. By 1996, air conditioners were being installed as standard in more than. If you have a window open, air from outside flows in and gets cooled.
Hvac02, air conditioning troubleshooting and repair introduction since im constantly receiving questions on 944 air conditioning systems, i figured its time to come up with come helpful troubleshooting tips. The haynes 10425 automotive heating and air conditioning manual, shows you the basic theory of ac and heating system operation this diy manual covers both r12 and r4a ac systems as well as converting to an r4a system, types of automotive ac systems, service and diagnostic tools, and much more. As you start the car and turn the air conditioner to the highest notch, determine how warm the air is. Online automotive hvac program curriculum ashworth college. R4a entering the condenser will be a highpressure high temperature vapor. Feb 06, 2018 automotive air conditioning services checking for the air flow. Is it necessary to switch off ac while starting the engine. In humid climates, provide allair systems for air conditioning. Figure 16 a combination meter that measures and displays both the temperature and the humidity is useful to use. The air conditioning system is made up of the following. Selfstudy programme 208 air conditioner in the motor vehicle.
It must circulate the air it must purify the air it must dehumidify the air these functions are essential if passenger comfort is to be maintained when the ambient temperature and humidity are high. Fundamentals of hvac controls the application of heating, ventilating, and air conditioning hvac controls starts with an understanding of the building and the use of the spaces to be conditioned and controlled. The text focuses on the generic theory that underlies the operation, diagnosis, and repair of the. To be effective, the automotive air conditioner must control four 4 conditions within the vehicle interior. Automotive air conditioning came about in the 1940s. Packard invented automotive ac all the way back in 1939, and in 1940 was the first car company to offer factoryinstalled air conditioning.
It could even be cool but not as cold as it should be. Introduction to air conditioning systems ced engineering. Halderman, automotive heating and air conditioning, 8th. Basic automotive air conditioning repair what to do when. Air conditioning troubleshooting and repair clarks garage. The pressure of thef evaporator will control its temperature. By 1996, air conditioners were being installed as standard in more than one in four newly registered vehicles. Feb 19, 2015 8 b explain how air conditioning load affect the engine performance.
In this issue fundamentals of car air conditioning functions of car air conditioners components of car air conditioners. If you need to do some work on your car or trucks ac system, be sure to have a repair manual specific to your vehicle. This document is a revision of prior publication 630140. Four seasons, a member of the smp family of brands, manufactures and distributes a comprehensive line of replacement mobile climate control products. We are the largest aftermarket climate control parts supplier in the industry and the largest compressor remanufacturer in the world. This is an introduction to air conditioning systems frequently referred to as hvac systems heating, ventilating and air conditioning systems.
In our online automotive hvac essentials certificate program, youll take hvac classes and learn automotive engine heating and cooling systems, air conditioning systems basics, rules, epa regulations, and safety practices for working with refrigerants, and how to troubleshoot techniques of automotive heating and air conditioning assemblies. The main function of this fan is to move air to and from the room. Understanding the basics of auto air conditioning systems. In the present the design of air conditioning is done for a volvo bus, a fully equipped automotive air conditioning system consists of five main components. Haynes automotive heating and air conditioning systems manual. That means, starting as a liquid in the evaporator, the refrigerant changes to vapor, is compressed to high pressure vapor, passes through the condenser, changes back. Jun 28, 20 automotive air conditioning came about in the 1940s. Enable the reader to understand the fundamental principles and. It serves one very fundamental purpose, as well, and that is to cool you down. In time the coffee will reach the temperature of the surrounding air. Customer demand for air conditioning is rising continually. It must cool the air the four major functions it must circulate the air it must purify the air it must dehumidify the air these functions are essential if passenger comfort is to be maintained when the ambient temperature and humidity are high.
Sep 22, 2015 the automotive air conditioning system includes thecompressor, condenser, evaporator, receiverdehydrator and connecting lineswhich includes expansion valve, orifice tube, suction throttling valve,positive operating absolute valve, evaporator pressure regulator valve, thermal sensor, high pressure cut off switch and cycling compressor switch. Environmental concerns have dictated more stringent standards s. Working on the 944 ac system is no different than working on any other automotive ac system. Following are the main equipment or parts used in an air conditioning system. This book gives a very good overview of the operation and repair of an air conditioning system which i found informative and intriguing. Heating and airconditioning principles 5 element that expands and contracts, based on the humidity. The a weighting scale is used to better estimate how the human ear hears sound pressure. Understanding electrical schematics part 1 revised.
Since then, technologies such as computerized automatic temperature control, which allow you to set the desired temperature automatically. The basic goal of the technician training and certi. Heating and airconditioning principles 3 212f 212f 212f 1 gram of vapor 540 calories 1 gram water 1 pound of vapor 970 btus 1 pound water heat heat figure the latent heat of vaporization that water vapor stores is released when the vapor condenses to a liquid. The air conditioning system is made up of the following components. As youll soon see, these principles explain how the refrigerant in an air conditioning system can absorb and carry off heat. Componentscondensersthe condenser function is to act as a heat exchanger and allow heat to flow from the hotrefrigerant to the cooler outside air. Having said that however, i would have liked to see more detail into actually charging the ac system with freon, effects of overcharging, etc.
Any automotive air conditioning system employs four basic partsa mechanical compressor, driven by the vehicles engine. Evaporator it is a device that looks like another heat exchanger and is place just behind the ac vent over a. J2064 for the coupling of automotive air conditioning hoses. Edu4 duct design basics includes powerpoint presentations additionally, the manual j portion of the curriculum provides instruction on how to perform the load calculation using the acca mj8ae speedsheet, which is an excel spreadsheet you can use in conjunction with the abridged edition of manual j to facilitate the learning process. Opportunities directly related to automotive technology a.
The automotive air conditioning system includes thecompressor, condenser, evaporator, receiverdehydrator and connecting lineswhich includes expansion valve, orifice tube, suction throttling valve,positive operating absolute valve, evaporator pressure regulator valve, thermal sensor, high pressure cut off switch and cycling compressor switch. How air conditioning works the essential ingredients in an air conditioning system are a fan to blow air around, a cold surface to cool and dehumidify the air, a warm surface and a source of water vapour. Give an overview of the historical development of the heating and ventilation system and introduction of the air conditioning ac system. It is a unit, which consists of cooling and dehumidifying processes for summer air conditioning or heating and humidification processes for winter air conditioning. Jan 03, 2019 jan 3, 2019 pdf motor vehicle mechanic free ebooks download. Online automotive hvac program curriculum our online automotive hvac program curriculum presents advanced concepts in automotive and light truck hvac service and repair. Automotive air conditioning services checking for the air flow. Describe the different classifications of ductwork.
Automotive heating and air conditioning 8th edition. Anytime a liquids change to a gas vapor, it must give up its heat and the heat is carried off in the. An air conditioner ac in a room or a car works by collecting hot air from a given space, processing it within itself with the help of a refrigerant and a bunch of coils and then releasing cool air into the same space where the hot air had originally been collected. Certification training manual mobile air conditioning. Provide the reader with a case study on the design and optimisation of an air conditioning ac system. It is intended for those engineers, architects and construction professionals who are only peripherally involved with hvac systems in their professional activities, but would like to learn more about. Read this hvac for dummies article and learn hvac in less than 5 minutes is it surprising that the average person cares very little about how their air conditioning. Expansion valve it is a device used in car air conditioning system to expand the high pressure, low temperature liquid refrigerant sent by the condenser in order to release pressure of the refrigerant before sending it to evaporator for the further process. Air conditioning equipment a detailed discussion of air conditioning equipment is beyond the scope of this presentation, but a few comments can be offered. The basics of an auto air conditioning system all types of air cooling systems from home to auto air conditioning units all operate on the same principles and have the same basic parts. Air conditioners exploit this feature of phase conversion by forcing special chemical compounds to evaporate and condense over and over again in a closed system of coils. Heat moves out of the hot 90 c coffee into the cooler 25 c surrounding air. All control systems operate in accordance with few basic principles but before we discuss these, lets address. Automotive ac systems fox valley electric auto association.
Theory of air conditioning how air conditioning works governmental regulations system inspection. They think that an air conditioner functions by pumping cool air into their home. The system conditions the air by cooling it and removing moisture to make you more comfortable while you drive. Performance automotive air conditioning the basics 18865 goll st. Water is a common material that can exist in all three states. An amendment to the united states clean air act has mandated that we phase out r12 as the refrigerant of choice since air conditioning systems with r12 are susceptible to leaks, ozone damage and environmental concerns pushed for the replacement of this refrigerant. That means, starting as a liquid in the evaporator, the refrigerant changes to vapor, is. Theory automotive air conditioning training manual 3. Hygrometers typically resemble a clock, with the scale reading from 0% to 100% relative humidity. When a hot cup of coffee is set aside for some time, it becomes cold. Basics of air conditioning most people dont realize how their central air conditioner actually works.
It can be normalized by replacing the cabin air filter of your car. Jul 26, 2018 10 best auto mechanic books to learn by yourself updated july 26, 2018 december 16, 2019 jee book, how to become an auto mechanic, resources, school we always get a lot of questions as of where to learn auto mechanic online and there sure is a lot of good auto mechanic online courses and schools already out there. Air conditioners have become a factor in active safety, and today can almost be considered as an integral part of a vehicles safety specification. Automotive air conditioning system theory freeautomechanic. But before we dive into the operation of a basic air conditioning system, theres one more set of rules we need to examine. Describe the purpose, components, and certification of automotive air conditioning. As a matter of fact, it would be quite difficult to imagine a modern vehicle without some means of providing a cooler and more comfortable ride especially when. Air conditioning basics prev next air conditioners use refrigeration to chill indoor air, taking advantage of a remarkable physical law. When a liquid converts to a gas in a process called phase conversion, it absorbs heat.
Singlepath systems have heating and cooling elements in a series configuration. As a flagship brand of standard motor products, four seasons. But your air conditioner actually removes warm air and recirculates it as cool air. At firestone complete auto care, all ac repair and ac services are handled by asecertified technicians. Automotive air conditioning ppt linkedin slideshare. With central systems, the primary conversion from fuel such as gas or electricity takes place in a central location, with some form of thermal energy distributed throughout the building or facility.
Automotive heating and air conditioning, 8e provides a complete, stateoftheart source on automotive heating, ventilation, and air conditioning systems, as well as the practical skills that students must master to be successful in the industry. Most important components of the ac system air conditioning compressor on average, it takes about 1 minute for refrigerant to complete a cycle within a typical auto ac system. The type of system is determined by the device used to control the expansion of the high pressure, high temperature liquid to a low pressure, low temperature liquid. R12 r4a refrigerants problems with evs and ac there are a few things to consider when trying to retain your ac system. These variations are specific to the make and model of different vehicles. In a large system there will also be a tangle of tubes to distribute the air. Of course, this early system didnt have a thermostat, but it was better than not having anything at all. The air conditioning in a car is a great example of this in action. Cdx learning systems automotive technician training. In 1954 the nash ambassador was the first american automobile to have a front end fully integrated heating ventilating and air conditioning system. Describe the components of air conditioning systems. Air conditioners use refrigeration to chill indoor air, taking advantage of a remarkable physical law. By performing these functions, the air conditioner maintains the body comfort of the passengers.
All air conditioning systems have these basic parts, although different systems use various forms of sensors to monitor pressure and temperatures. Describe the major components and controls associated with air conditioning. Automotive air conditioning system diagram automotive. Any automotive air conditioning system employs four basic parts. An automotive air conditioning system works a lot like the ac system that you have at home or the office. Part ii, mohinder s bhatti, ashrae journal, september 1999 and section 50. They have also completed training through epaapproved ac programs. Refrigerant there are two types of refrigerants used in automotive applications.
Use these systems for applications where several spaces with uniform loads will be served by a single apparatus and where. On older automotive air conditioning systems the factory installed refrigerant was r12. These systems are central systems which provide complete sensible and latent heating and cooling of the air supply. Air conditioning clinic trgtrc018en american standard inc. A simple air conditioning circuit and cycle diagram that you.
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