|
HEATING, VENTILATION, AND AIR CONDITIONING
Diploma Program
The American School of Technology is an approved training sponsor for the National Center for Construction Education and Research (NCCER). Our Heating Ventilation and Air Conditioning/Refrigeration program utilizes the (ContrenConnect) curriculum developed by NCCER. ContrenConnect is an interactive web-based tool that partners textbooks and internet driven materials to give the student a multi-dimensional learning experience.
Our HVAC/R environment is task oriented, so every student undergoes written and performance-based learning. This hands-on approach successfully prepares our students for employment in various HVAC/R positions in the field. Our instructors are NCCER Craft certified in the HVAC/R field and our facility is designed with technology including overhead projectors, an HVAC/R lab containing various HVAC/R equipment and components, a student-assisted tool crib and web based learning and research work stations for students.
Educational Objectives:
This program is designed for women and men regardless of previous training in heating, Ventilation, and Air Conditioning. The objective of the program is to provide the student with an understanding of HVAC/R systems, their operation, and diagnosis to obtain job entry skills or advancement within the heating and refrigeration industry. The graduate may have opportunities in many facets of the industry such as heating/Cooling Technician, Refrigeration Technician, industrial maintenance Technician.
Program Outline
Daytime Program: 720 Clock Hours; 2 Payment Period; 24 Semester Credit Hours; 40 Weeks
Evening Program: 720 Clock hours; 2 Payment Periods; 24 Semester Credit Hours; 40 Weeks
Course Outline:
|
Course Number |
Course Name |
Clock Hours |
Credit Hours |
|
H100-1 |
Core & Basic HVAC Skills |
180 |
6 |
|
H110-1 |
Advanced Heating |
180 |
6 |
|
H120-1 |
Advanced Cooling & Refrigeration |
150 |
5 |
|
H130-1 |
Advanced Associated Skills |
180 |
6 |
|
CD100 |
Career Development |
30 |
1 |
|
|
--------------------------- |
------ |
----- |
|
|
Totals |
720 |
24 |
H100-1 Core Curriculum and Basic HVAC Skills 6 credits
This course is designed to provide an orientation to and practical experience in the HVAC trade. Students will understand work place expectations, responsibilities and terminology. Students will learn to use STP (Standard Trade Practices) methods of installation, troubleshooting and repair of cooling and refrigeration systems and the importance of professionalism in the work place.
\OVERVIEW
Module 00101-09 Basic Safety
Construction safety has advanced a great deal over the years. There was a time in the industry when very few safety precautions were taken. Workers often worked without hard hats, gloves, eye protection, fall protection, or safety shoes. This resulted in illnesses, injuries, and deaths. Today, with the help of the Occupational Safety and Health Administration (OSHA) and state and local rules and regulations, the construction industry is becoming safer,
Rules and regulations are only a part of what contributes to a safe work environment. Construction workers have the ultimate responsibility for their safety and the safety of others. One way to remain safe is always to use appropriate personal protective equipment (PPE). The type of personal protective equipment will vary depending on your job. For example, a heavy machine operator is not required to wear the same face shield a welder is required to wear.
Proper training is also an essential part of creating a safe work environment. Training must be provided to all workers to ensure that they perform work and use and maintain all tools and equipment safely. When a worker does not know how to use a tool or equipment or has not been properly trained to use personal protective equipment, he or she should immediately tell a supervisor and ask for the necessary training. Safe behavior and safe equipment help to prevent accidents and injury.
Objective
When you have completed this module, you will be able to do the following:
- Explain the role that safety plays in the construction crafts.
- Describe the meaning of job-site safety.
- Describe the characteristics of a competent person and a qualified person.
- Explain the appropriate safety precautions to take around common job-site hazards.
- Demonstrate the use and care of appropriate personal protective equipment (PPE).
- Properly don and remove personal protective equipment (safety goggles, hard hat, and personal fall protection).
- Follow the safety procedures required for lifting heavy objects.
- Describe safe behavior on and around ladders and scaffolds.
- Explain the importance of hazard communications (HazCom) and material safety data sheets (MSDSs).
- Describe fire prevention and firefighting techniques.
- Define safe work procedures to use around electrical
Module 00102-09 Introduction to Construction Math
Basic math skills such as addition, subtraction, multiplication, and division are used every day in the construction industry. These skills are the foundation for more complex math skills that are used in construction such as working with fractions, percentages, decimals, and the metric system.
Math is used for tasks as simple as counting nails and as complex as calculating the dimensions of a building. All trades in the construction industry use math. For example, electricians use math to determine how much wire they need, pipefitters use math to accurately measure piping and fittings, and HVAC technicians use math to install and operate testing equipment.
Make math a priority. A good understanding of math also helps ensure safety on the site. Measurements and calculations must be accurate to avoid material and equipment failure, both of which can result in accidents and injuries. Take the time to do the math required for your job carefully and correctly.
Objectives
When you have completed this module, you will be able to do the following:
- Add, subtract, multiply, and divide whole numbers, with and without a calculator. Use a standard ruler and a metric ruler to measure.
- Add, subtract, multiply, and divide fractions.
- Add, subtract, multiply, and divide decimals, with and without a calculator.
- Convert decimals to percentages and percentages to decimals.
- Convert fractions to decimals and decimals to fractions.
- Explain what the metric system is and how it is important in the construction trade.
- Recognize and use metric units of length, weight, volume, and temperature.
- Recognize some of the basic shapes used in the construction industry and apply basic geometry to measure them.
Module 03102-07 Trade Math
HVAC technicians use math for many purposes. Math is an essential skill required to advance in the HVAC profession and is necessary to do many tasks in your everyday work. Math is needed when cutting and fitting pipe, when sizing and installing ductwork, and when calculating electrical current flow.
In HVAC work, you must understand the metric system and various conversion units. Knowing powers of ten, square roots, and how to work basic problems in algebra and geometry is extremely useful when calculating things such as air flow and sensible load.
The HVAC technicians who know math and can solve basic math problems will have a big advantage over those workers who cannot use math to do their job. Learning trade math principles is one of the more important objectives in your training program.
Objective
When you have completed this module, you will be able to do the following:
- Identify similar units of measurement in both the inch-pound (English) and metric systems and state which units are larger.
- Convert measured values in the inch-pound system to equivalent metric values and vice versa.
- Express numbers as powers of ten.
- Determine the powers and roots of numbers.
- Solve basic algebraic equations.
- Identify various geometric figures.
- Use the Pythagorean Theorem to make calculations involving right triangles.
- Convert decimal feet to feet and inches and vice versa.
- Calculate perimeter, area, and volume.
- Convert temperature values between Celsius and Fahrenheit.
Module 00103-09 Introduction to Hand Tools
Hand tools are the backbone of the construction trades. Hammers, wrenches, pliers, saws, shovels, and squares are just a few of the hand tools that are used every day on construction sites. Hand tools must be properly used and maintained at all times. Tools that are damaged or don’t work are dangerous.
Safety is an important part of using hand tools. This means that tools must always be clean, dry, well-maintained, and used only for the job they were designed to do. Workers must be thoroughly trained in the proper use and maintenance of hand tools. This helps prevent accidents, damages, and injuries.
Take the time to learn how to properly maintain and use tools. It can make the difference between a job well done and the damage of equipment or loss of lives.
Objectives
When you have completed this module, you will be able to do the following:
- Recognize and identify some of the basic hand tools used in the construction trade.
- Use hand tools safely.
- Describe the basic procedures for taking care of hand
Module 00104-09 Introduction to Power Tools
Power tools are frequently used throughout construction trades. It is very common to see power tools such as drills, saws, grinders, sanders, and nailers on a construction site. These tools are typically powered by electricity, pressurized air, or pressurized fluids.
When power is added to a tool, there is a significant increase in the risks associated with using the tools. For example, you might sustain a serious cut when using a handsaw. However, the same amount of contact with a circular saw could cause a much more severe injury.
Much like the safety precautions required for nonpowered hand tools, anyone using a power tool must be thoroughly trained in the maintenance and proper use of power tools. Power tools should only be used for the work they were designed to do. They should also be kept dry, clean, and in good working order. Never put yourself at risk by using a power tool you don’t know how to use or one that isn’t safe.
Objectives
When you have completed this module, you will be able to do the following:
- Identify power tools commonly used in the construction trades.
- Use power tools safely.
- Explain how to maintain power tools
Module 00105-09 Introduction to Construction Drawings
Construction drawings are architectural or working drawings used to represent a structure or system. These were traditionally referred to as blueprints, because years ago the lines on a blueprint were white and the background was blue. Construction drawings are also called prints. Today, most prints are created by computer-aided drafting (CAD) and they have blue or black lines on a white background. Various kinds of construction drawings, including residential drawings, commercial drawings, landscaping plans, shop drawings, and industrial drawings, are used in construction. In this module, you will learn about some basic types of drawings.
Objective
When you have completed this module, you will be able to do the following:
- Recognize and identify basic construction drawing terms, components, and symbols.
- Relate information on construction drawings to actual locations on the print.
- Recognize different classifications of construction drawings.
- Interpret and use drawing dimensions.
Module 00107-09 Basic Communication Skills
During your career in the construction trades, you will learn many skills. Effective communication skills, however, will always be your greatest asset. The ability to read, write, speak, and listen effectively will remain critical throughout your career as you interact with workers at all levels.
The types of reading materials that are typically read on a construction site include safety instructions, blueprints, signs, labels, change orders, and material lists. The ability to read these documents is important. For example, if a worker who is unable to read is given written safety instructions, it is likely that an accident or injury will occur. As you progress through your career, you may gain a leadership role. In this role, you will likely be responsible for writing documents related to the job. Make writing a strong skill in the beginning of your career. It is a skill that can only improve with time and experience.
The ability to speak and listen is as important as the ability to read and write. Because workers are often given instructions verbally, it is crucial that the person giving the instructions speaks clearly and concisely and that he or she recognizes any language or intellectual barrier that may exist. The ability to listen is also important in this process. There can be serious consequences if the instructions that are being given are unclear or misunderstood. Always make sure that you understand what is being said to you and that those that you speak to understand what you are saying.
Objectives
- When you have completed this module, you will be able to do the following:
- Demonstrate the ability to interpret information and instructions presented in both written and verbal form.
- Demonstrate the ability to communicate effectively in on-the-job situations using written and verbal skills.
Module 00108-09 Basic Employability Skills
Everyone wants a job. It’s the workers who present themselves in a professional manner, however, who usually get the job. Being professional means getting along with co-workers, following the rules, behaving appropriately, being honest, and completing your work on time. All of these skills are considered basic employability skills.
Basic employability skills require you to think critically and make appropriate decisions. They also require you to be prepared and knowledgeable about the job for which you are applying. You are most prepared for finding a job when you have a good resume and references. It’s also important to ask appropriate questions of the potential employer to find out if they are a good match for your needs.
Computer skills can also contribute to your employability. More and more companies are using computer software for administrative, design, and fabrication functions. Developing your computer skills will provide you with an advantage over the completion.
Objectives
When you have completed this module, you will be able to do the following:
- Explain the construction industry, the role of the companies that make up the industry, and the role of individual professionals in the industry.
- Demonstrate critical thinking skills and the ability to solve problems using those skills.
- Demonstrate knowledge of computer systems and explain common uses for computers in the construction industry.
- Demonstrate effective relationship skills with teammates and supervisors, the ability to work on a team, and appropriate leadership skills.
Be aware of workplace issues such as sexual harassment, stress, and substance abuse.
00109-09 Introduction to Material Handling
Manual materials handling is a common task on most construction sites, and is one of the leading causes of non-fatal injuries in the construction industry. According to the Bureau of Labor Statistics, each year over one million workers suffer from back injuries, and one of every five workplace injuries or illnesses is associated with back injuries. Most tasks performed in construction involve the handling of some type of material or load, such as wood, bricks, lumber, pipes, or other supplies, on a daily basis. A load is defined as the quantity of materials able to be carried, transported, or relocated at one time by a machine, vehicle, piece of equipment, or person. The risk of injury is present each time you handle materials, so always be conscious of what you’re doing and follow basic materials-handling safety rules.
When you have completed this module, you will be able to do the following:
- Define a load.
- Establish a pre-task plan prior to moving a load.
- Use proper materials-handling techniques.
- Choose appropriate materials-handling equipment for the task.
- Recognize hazards and follow safety procedures required for materials handling.
Module 03101-07 Introduction to HVAC
This program will pave the way for you to begin a career in one of America’s most dynamic industries. Virtually every one of the tens of millions of homes and businesses in the United States has a heating system, and a large percentage have comfort cooling systems as well. Workers trained in this industry have the opportunity to install systems in new construction, service equipment in existing construction, and replace aging systems.
Working in the HVAC industry is challenging and rewarding because environmental technology is constantly changing. Technical advances in HVAC systems are made every day in advanced computerized controls, greater operating efficiency, and improved packaging.
The HVAC industry offers many opportunities for advancement. The training you are receiving can qualify you to become an installer, troubleshooter, sales technician, system design specialist, and eventually even the owner of your own HVAC service business.
Objectives
When you have completed this module, you will be able to do the following:
- Explain the basic principles of heating, ventilating, and air conditioning.
- Identify career opportunities available to people in the HVAC trade.
- Explain the purpose and objectives of an apprentice training program.
- Describe how certified apprentice training can start in high school.
- Describe what the Clean Air Act means to the HVAC trade.
- Describe the types of regulatory codes encountered in the HVAC trade.
- Identify the types of schedules/drawings used in the HVAC trade.
Module 03103-07 Copper and Plastic Piping Practices
Copper piping is used extensively in HVAC work, primarily for refrigerant piping. In this work, using the correct type and size of copper piping and correctly joining that piping are critical to the performance of the system. Solder and braze joints must be perfect. Because these systems are under pressure, even a tiny leak will cause the loss of refrigerant. This will reduce system performance and eventually could result in serious damage to the system.
Plastic piping is used in cooling, refrigeration, and heating systems. In cooling and refrigeration systems, it is used to make condensate drains. In chilled-water systems, plastic piping may be used to carry the water that circulates through the system. Plastic piping is usually joined with cement. As with copper, these joints must be correctly made to avoid leaks. One major use of plastic pipe in furnaces is to carry supply air to support combustion and to carry the byproducts of combustion to the outdoors.
Objectives
When you have completed this module, you will be able to do the following:
- State the precautions that must be taken when installing refrigerant piping.
- Select the right tubing for a job.
- Cut and bend copper tubing.
- Safely join tubing by using flare and compression fittings.
- Determine the kinds of hangers and supports needed for refrigerant piping.
- State the basic requirements for pressure-testing a system once it has been installed.
- Identify types of plastic pipe and state their uses.
- Cut and join lengths of plastic pipe.
Module 03301-08 Refrigerants and Oils
In today’s world, the HVAC technician must be thoroughly versed in the use and storage of refrigerants and oils used in the mechanical refrigeration cycle. Laws adopted in the 1990s mandate elimination of old refrigerants and their replacement with new, often more complex refrigerants. In addition to phasing out environmentally unsafe refrigerants, these laws provide harsh penalties for using banned refrigerants and for releasing refrigerants into the atmosphere. It is essential that anyone servicing HVAC and refrigeration equipment be thoroughly familiar with the rules governing Refrigerants.
It is rare to find new refrigerants that are drop-in replacements for the banned refrigerants. Even if the two refrigerants are compatible, they are not likely to be compatible with the oil used to lubricate the compressor. So in addition to refrigerants, service technicians must know about oils.
Objectives
When you have completed this module, you will be able to do the following:
- Identify the refrigerants in common use and state the types of applications in which each is used.
- Explain the effects of releasing refrigerants into the atmosphere.
- Explain how refrigerants are classified by their chemical composition.
- Describe the color-coding scheme used to identify refrigerant cylinders.
- Describe how azeotropes and near-azeotropes differ from each other and from so-called pure refrigerants.
- Interpret a P-T chart for an azeotrope refrigerant.
- Calculate superheat and subcooling.
- Demonstrate refrigerant leak detecting methods.
- Identify the different types of oils used in refrigeration systems and explain their relationships to the various refrigerants.
- Explain how to add and remove oil from a system.
- Describe how to test oil for contamination.
- Perform a refrigerant retrofit.
Module 03107-07 Introduction to Cooling
Cooling is accomplished by removing heat, not by generating cold air. In an air conditioner, a heat exchanger—the evaporator—in the conditioned space is used to transfer heat to a chemical refrigerant flowing through the heat exchanger. The refrigerant is then routed to another heat exchanger—the condenser—where the heat that was removed from the conditioned space is transferred to the outdoor air. This process is made possible by changing the temperature and pressure of the chemical refrigerant as it flows through the system.
Different systems may use different methods of accomplishing this process, but they all work on the same principle. Therefore, once you understand temperature-pressure relationships and how they affect the refrigeration cycle, you will understand the operating principles of all refrigeration systems.
Objectives
When you have completed this module, you will be able to do the following:
- Explain how heat transfer occurs in a cooling system, demonstrating an understanding of the terms and concepts used in the refrigeration cycle.
- Calculate the temperature and pressure relationships at key points in the refrigeration cycle.
- Under supervision, use temperature- and pressure-measuring instruments to make readings at key points in the refrigeration cycle.
- Identify commonly used refrigerants and demonstrate the procedures for handling these refrigerants.
- Identify the major components of a cooling system and explain how each type works.
- Identify the major accessories available for cooling systems and explain how each works.
- Identify the control devices used in cooling systems and explain how each works.
- State the correct methods to be used when piping a refrigeration system.
Module 03108-07 Introduction to Heating
Just about every home in the United States has some type of heating system. Gas-fired forced-air furnaces are the most common, but oil-fired furnaces and electric heat are also used. Installing and servicing furnaces is a big responsibility. Because flame and combustible fuels are involved, there is a potential for fire or explosion. In addition, furnaces that develop internal leaks can kill building occupants. On the other hand, there are tens of millions of furnaces being safely used today. If furnaces are properly installed according to the manufacturer’s instructions, and periodically inspected and serviced by qualified technicians, they will operate satisfactorily for many years.
Objectives
When you have completed this module, you will be able to do the following:
- Explain the three methods by which heat is transferred and give an example of each.
- Describe how combustion occurs and identify the byproducts of combustion.
- Identify the various types of fuels used in heating.
- Identify the major components and accessories of an induced draft and condensing gas furnace and explain the function of each component.
- State the factors that must be considered when installing a furnace.
- Identify the major components of a gas furnace and describe how each works.
- With supervision, use a manometer to measure and adjust manifold pressure on a gas furnace.
- Identify the major components of an oil furnace and describe how each works.
- Describe how an electric furnace works.
- With supervision, perform basic furnace preventive maintenance procedures such as cleaning and filter replacement.
Module 03106-07 Basic Electricity
Air conditioning, heating, and refrigeration systems use electricity to obtain operating power for their compressors, fan motors, and other load devices. In addition, electrical switching devices, sensors, and indicators are used in the control circuits of these systems. Some of these control systems are quite complex, containing thermostats, as well as numerous switching devices. Many systems use microprocessor controls, and some systems used in commercial building are managed from a central computer.
Most of the problems an HVAC technician encounters on a service call involve the electrical system. Therefore, it is essential that the technician understand electrical circuits and be able to interpret complex circuit diagrams. Without these skills, diagnosing system problems would be pure guesswork.
Objectives
When you have completed this module, you will be able to do the following:
- State how electrical power is distributed.
- Describe how voltage, current, resistance, and power are related.
- Use Ohm’s law to calculate the current, voltage, and resistance in a circuit.
- Use the power formula to calculate how much power is consumed by a circuit.
- Describe the differences between series and parallel circuits and calculate loads in each.
- Describe the purpose and operation of the various electrical components used in HVAC equipment.
- State and demonstrate the safety precautions that must be followed when working on electrical equipment.
- Make voltage, current, and resistance measurements using electrical test equipment.
- Read and interpret common electrical symbols.
Module 03207-07 Basic Electronics
Most HVAC products hitting the market today use electronic control devices. Although you may encounter electromechanical control devices, they are outdated. For example, thermistors are now commonly used as temperature sensing devices in place of bimetallic switches. Most zone/room thermostats marketed today are programmable electronic devices. Heating and cooling systems now have “black box” control modules or printed circuit boards that do all their thinking and provide information on the status of the system. Microprocessor-based controls are now found in everything from residential furnaces and air conditioning systems to the systems used to heat and cool industrial complexes.
Anyone doing installation or service work these days is likely to encounter these electronic devices. In addition, service technicians must know how to program a thermostat and how to troubleshoot a heating or cooling system in which all the controls are solid-state electronic devices.
Objectives
When you have completed this module, you will be able to do the following:
- Explain the basic theory of electronics and semiconductors.
- Explain how various semiconductor devices such as diodes, LEDs, and photo diodes work, and how they are used in power and control circuits.
- Identify different types of resistors and explain how their resistance values can be determined.
- Describe the operation and function of thermistors and cad cells.
- Test semiconductor components.
- Identify the connectors on a personal computer.
H110-1 Advanced Heating 6 Credits
This course is designed to provide an orientation to and practical experience in the HVAC trade. Students will understand work place expectations, responsibilities and terminology. Students will learn to use STP (Standard Trade Practices) methods of installation, troubleshooting and repair of cooling and refrigeration systems and the importance of professionalism in the work place.
MODULE OVERVIEW
Module 03202-07 Chimneys, Vents and Flues
In order to operate efficiently and safely, furnaces and other fuel-burning appliances must have an adequate supply of air to support combustion, as well as proper venting of the gases created as byproducts of combustion. There are two specific concerns when selecting and installing a furnace vent. The first is to make sure that toxic by-products of combustion are vented to the outdoors. The second is to avoid condensation that could corrode the vent and the furnace heat exchangers. There are well-defined standards covering the materials and methods used to vent furnaces. These standards are reflected in the furnace manufacturer’s installation instructions. Failure to follow these instructions could create a deadly environment for building occupants.
When you have completed this module, you will be able to do the following:
- Describe the principles of combustion and explain complete and incomplete combustion.
- Describe the content of flue gas and explain how it is vented.
- Identify the components of a furnace vent system.
- Describe how to select and install a vent system.
- Perform the adjustments necessary to achieve proper combustion in a gas furnace.
- Describe the techniques for venting different types of furnaces.
- Explain the various draft control devices used with natural-draft furnaces.
- Calculate the size of a vent required for a given application.
- Adjust a thermostat heat
Module 03105-07 Ferrous Metal Piping Practices
Many large commercial systems use water to transfer heat from the indoors to the outdoors. Hydronic heating systems use hot water to deliver heat to the conditioned space. In these applications, water may be carried in galvanized steel pipe. In residential applications, black iron is used to supply natural gas to a gas-fired furnaces. Both galvanized steel and black iron pipe are joined using threaded fittings. The fittings come pre-threaded, but the pipe must be cut to size and threaded on the job. For that reason, the ability to measure, cut, and thread galvanized and black iron pipe is a necessary skill for anyone installing HVAC systems.
When you have completed this module, you will be able to do the following:
- Identify the types of ferrous metal pipes.
- Measure the sizes of ferrous metal pipes.
- Identify the common malleable iron fittings.
- Cut, ream, and thread ferrous metal pipe.
- Join lengths of threaded pipe together and install fittings.
- Describe the main points to consider when installing pipe runs.
- Describe the method used to join grooved
Module 03209-07 Troubleshooting Gas Heating
Gas furnaces and other gas heating devices contain a variety of controls. Most of these controls are safety devices that either shut the system down in the event of a problem or prevent it from operating if certain conditions are not met in a specified sequence. The service technician must be able to determine how the control devices interact to control the system. The safety controls are not the only things that can go wrong in a gas appliance. The service technician must also learn to recognize combustion-related problems and test the combustion system using specialized test instruments.
When you have completed this module, you will be able to do the following:
- Describe the basic operating sequence for gas heating equipment.
- Interpret control circuit diagrams for gas heating systems.
- Describe the operation of various types of burner ignition methods.
- Identify the tools and instruments used when troubleshooting gas heating systems.
- Demonstrate using the tools and instruments required for troubleshooting gas heating systems.
- Isolate and correct malfunctions in gas heating systems.
Module 03203-07 Introduction to Hydronic Systems
A hydronic system uses water, rather than air, as a medium for providing heating and cooling. In hydronic systems, instead of conditioned air being carried in ductwork, conditioned water is carried through pipes to heat exchangers. Circulating pumps are used to move the water. Hydronic systems also use different types of control systems and safety devices than forced-air systems. In a hydronic heating system, water is heated in a boiler and piped to heating terminals where the heat is transferred to the conditioned space. The water can be heated using gas or oil as a fuel source. Residential and small commercial systems, which are the type covered in this introductory module, use low-temperature, low-pressure water. Large commercial systems, which are covered in a later module, use high-temperature, high-pressure steam systems.
When you have completed this module, you will be able to do the following:
- Explain the terms and concepts used when working with hot-water heating.
- Identify the major components of hot-water heating.
- Explain the purpose of each component of hot-water heating.
- Demonstrate the safety precautions used when working with hot-water systems.
- Demonstrate how to operate selected hot-water systems.
- Demonstrate how to safely perform selected operating procedures on low-pressure systems.
- Identify the common piping configurations used with hot-water heating.
- Read the pressure across a water system circulating pump.
- Calculate heating water flow rates.
- Select a pump for a given application.
Module 03305-08 Commercial Hydronic Systems
In an earlier module, you learned about hydronic systems that use boilers and piping to provide heating for residential applications. In commercial applications, water can be used as the heat exchange medium for both heating and cooling. Heating is still provided by boilers, but they are much larger than those used in residential systems. These systems may also use components and accessories not commonly found on residential hydronic systems. In most hydronic cooling systems, refrigerant is used to chill the water, which is then used as a heat transfer medium. The main component of such a system is called a chiller. Chillers are available for applications ranging from 5 tons to about 2,500 tons. Most chillers use the mechanical refrigeration cycle to chill the water, but other types, called absorption liquid chillers, use a chemical process. Because of their complex nature, the maintenance of commercial hydronic systems requires specialized training. One of the main servicing requirements is maintaining the proper chemical balance in the water in order to avoid biological growth that can be harmful to building occupants, as well as to the system itself.
When you have completed this module, you will be able to do the following:
- Explain the terms and concepts used when working with hot-water heating and chilled-water cooling systems.
- Identify the major components of hot-water heating, chilled-water cooling, and dual- temperature water systems.
- Explain the purpose of each component of hot-water heating, chilled-water cooling, and dual-temperature water systems.
- Demonstrate the safety precautions used when working with hot-water/chilled-water systems.
- Explain the differences between reciprocating, rotary screw, scroll, and centrifugal chillers.
- Identify the common piping configurations used with hot-water heating and chilled-water cooling systems.
- Explain the principles involved, and describe the procedures used, in balancing hydronic systems.
- Select, calibrate, and properly use the tools and instruments needed to balance hydronic systems.
- Read the pressure across a water system circulating
Module 03306-08 Steam Systems
Steam is the most widely used form of energy for industrial use in the world. Water itself is generally plentiful, as well as inert, making it a desirable compound to work with in many applications. The energy stored within water, once it is has been sufficiently heated to the point of vaporization and beyond, can be five to six times greater than liquid water can generally carry. Coupled with the fact that pumps are not required to move steam from the point of creation to the intended load, it easily becomes the best means of storing and moving large amounts of energy in a variety of applications. Steam plays an important role in the heating of large industrial and multi-building applications. Anyone working in such environments must be knowledgeable about the generation and control of steam.
When you have completed this module, you will be able to do the following:
- Explain the terms and concepts used when working with steam-heating systems.
- Identify the major components of steam-heating systems.
- Explain the purpose of each component of steam-heating systems.
- Describe the basic steam-heating cycle.
- Safely perform selected operating procedures on low-pressure steam boilers and systems.
- Install and maintain selected steam traps.
- Identify the common piping configurations used with steam-heating systems.
- Identify the types of common piping configurations used with steam-heating systems.
- Safely perform selected operating procedures on low-pressure steam boilers and systems.
- Install and maintain selected steam traps.
- Identify the types of common piping configurations used with steam-heating systems.
Module 03310-08 Troubleshooting Oil Heating
In northern sections of the U.S., many homes are heated with oil furnaces. There was a time when oil was a very inexpensive way to heat, so oil furnaces became very popular. In other instances, natural gas just wasn’t available to the home when it was built, so oil was the best alternative. Although the end result is the same as that of a gas furnace, the method of producing heat is significantly different. One of the main differences is that the oil must be pumped to the point of combustion, whereas natural gas is supplied under pressure. Because the components of oil furnaces are different from those of gas-fired furnaces, troubleshooters must learn to interpret wiring diagrams that are significantly different from those of gas furnaces. In addition, troubleshooting and maintenance of oil furnaces requires different test equipment, such as gas analyzers and draft gages.
When you have completed this module, you will be able to do the following:
- Describe the basic operating sequence for oil-fired heating equipment.
- Interpret control circuit diagrams for an oil heating system.
- Develop a troubleshooting chart for an oil heating system.
- Identify the tools and instruments used in troubleshooting oil heating systems.
- Correctly use the tools and instruments required for troubleshooting oil heating systems.
- Isolate and correct malfunctions in oil heating systems.
- Describe the safety precautions that must be taken when servicing oil heating systems.
Module 03109-07 Air Distribution Systems
The vast majority of heating and cooling systems use ductwork to deliver conditioned air to the spaces being cooled or heated. The ductwork may be made of sheet metal, fiberglass ductboard, fabric, or flex duct. The performance of an HVAC system is closely linked to the quality of the air system. The ductwork must be of the proper size and type, and must be correctly installed and sealed in order for the system to work properly. For those reasons, duct installation is one of the most important duties of the HVAC installer.
When you have completed this module, you will be able to do the following:
- Describe the airflow and pressures in a basic forced-air distribution system.
- Explain the differences between propeller and centrifugal fans and blowers.
- Identify the various types of duct systems and explain why and where each type is used.
- Demonstrate or explain the installation of metal, fiberboard, and flexible duct.
- Demonstrate or explain the installation of fittings and transitions used in duct systems.
- Demonstrate or explain the use and installation of diffusers, registers, and grilles used in duct systems.
- Demonstrate or explain the use and installation of dampers used in duct systems.
- Demonstrate or explain the use and installation of insulation and vapor barriers used in duct systems.
- Identify the instruments used to make measurements in air systems and explain the use of each instrument.
- Make basic temperature, air pressure, and velocity measurements in an air distribution system.
Module 03201-07 Commercial Airside Systems
HVAC Level One focused on the types of systems and equipment used in residential and small commercial applications. Larger buildings use much different systems. You may have seen office buildings and shopping malls with many air conditioning units on the roof. What you can’t see is that, unlike residential systems where refrigerant lines penetrate the building, these are likely to be packaged units in which the ductwork penetrates the building. Large buildings have different needs than small buildings. For example, there are cases where some zones in the building will be calling for heat, while others are calling for cooling, and still others are making no demands. The system design must be able to accommodate these differences. In commercial systems, it is more common to find single systems serving multiple zones, with each zone having its own comfort control device. These applications require special air distribution equipment not commonly found in residential applications.
When you have completed this module, you will be able to do the following:
- Identify the differences between types of commercial air systems.
- Identify the type of building in which a particular type of system is used.
- Explain the typical range of capacities for a commercial air system.
H120-1 Advanced Cooling & Refrigeration 5 Credits
This course is designed to provide an orientation to and practical experience in the HVAC trade. Students will understand work place expectations, responsibilities and terminology. Students will learn to use STP (Standard Trade Practices) methods of installation, troubleshooting and repair of cooling and refrigeration systems and the importance of professionalism in the work place.
MODULE OVERVIEW
Module 0304-07 Soldering and Brazing
Soldering - This process produces a joint sealed with a low-temperature, non-magnetic solder alloy of lea d and tin, or with non-lead alloys if the pipe that is being joined is used for drinking water supply. A low-temperature heat source, such as a propane or air/acetylene torch, is used in the soldering process.
Brazing – When mechanically strong, pressure-resistance joints are needed, the process used is brazing, a higher-temperature joining process using filler metals of silver or copper alloy. Because higher temperatures are needed for the brazing process, the heating equipment is typically oxygen/acetylene or oxygen/LP, each of which produces higher temperatures than soldering equipment.
When you have completed this module, you will be able to do the following:
- Assemble and operate the tools used for soldering.
- Prepare tubing and fittings for soldering.
- Identify the purposes and uses of solder and solder fluxes.
- Solder copper tubing and fittings.
- Assemble and operate the tools used for brazing.
- Prepare tubing and fittings for brazing.
- Identify the purposes and uses of filler metals and fluxes used for brazing.
- Braze copper tubing and fittings.
- Identify the inert gases that can be used safely to purge tubing when brazing.
Module 03302-08 Compressors
Compressors typically are the most expensive and, functionally, the most important part of a complete refrigeration system. Replacing a compressor is one of the most critical service procedures performed on refrigeration systems. Many compressors that are replaced are not defective. In many cases this is because compressor operation and its relationship to the whole system are not fully understood by the HVAC technician. The result is needless service time and customer expense, as well as the failure to repair the equipment. Because understanding how a compressor works is so important, this module reviews some basic information about compressors previously covered in HVAC Level One. This is enhanced with new information that will help you accurately diagnose a compressor failure, understand why it failed, and correctly install a replacement compressor.
When you have completed this module, you will be able to do the following:
- Identify the different types of compressors.
- Demonstrate or describe the mechanical operation for each type of compressor.
- Demonstrate or explain compressor lubrication methods.
- Demonstrate or explain methods used to control compressor capacity.
- Demonstrate or describe how compressor protection devices operate.
- Perform the common procedures used when field servicing open and semi-hermetic compressors, including:
- Shaft seal removal and installation
- Valve plate removal and installation
- Unloader adjustment
- Demonstrate the procedures used to identify system problems that cause compressor failures.
- Demonstrate the system checkout procedure performed following a compressor failure.
- Demonstrate or describe the procedures used to remove and install a compressor.
- Demonstrate or describe the procedures used to clean up a system after a compressor burnout.
Module 03303-08 Metering Devices
The metering device in a refrigeration system performs two important functions. First, it matches the rate of refrigerant flow entering the evaporator with the rate at which the evaporator will boil liquid refrigerant flow entering the evaporator with the rate at which the evaporator will boil liquid refrigerant into vapor. Second, it provides a pressure drop that separates the high side from the system from the low side, where the actual cooling occurs. A variety of metering devices are use in modern systems to control the flow of refrigerant. These devices include capillary tubes, precision orifices, pressure-operated valves, thermal expansion valves (TEVs or TXVs), float valves, electronic expansion valves (EEVs), and distributors. The metering device is also called a flow control device or refrigerant control.
When you have completed this module, you will be able to do the following:
- Explain the function of metering devices.
- Describe the operation of selected fixed-orifice and expansion valves.
- Identify types of expansion valves.
- Describe problems associated with replacement of expansion valves.
- Describe the procedure for installing and adjusting selected expansion device.
Module 03210-07 Troubleshooting Cooling
Troubleshooting cooling systems involves close examination of the equipment to
detect telltale signs of what may be wrong. There are standard procedures to follow that make troubleshooting cooling systems easier than the trial-and-error method. By using manufacturers’’ wiring diagrams, specifications and troubleshooting aids, the cause of almost any malfunction can be quickly isolated and resolved.
When you have completed this module, you will be able to do the following:
- Module Describe a systematic approach for troubleshooting cooling systems and components.
- Isolate problems to electrical and/or mechanical functions in cooling systems.
- Recognize and use equipment manufacturer’s troubleshooting aids to troubleshoot cooling systems.
- Identify and use the service instruments needed to troubleshoot cooling systems.
- Successfully troubleshoot selected problems in cooling equipment.
- State the safety precautions associated with cooling troubleshooting
03211-07 Heat Pumps
Heat pumps provide both cooling and heating using the mechanical refrigeration cycle. The secret to this capability is that even cold air contains some heat. The heat pump can extract that heat by reversing the refrigeration cycle. The heat pump contains a few more control devices than the cooling-only system, and its heat exchangers are larger because they serve two functions. Other than that, the heat pump looks just like a common air conditioning system. Air-to-air heat pumps are the most common type, but some heat pumps use water from wells or ponds as a heat source. Others, called geothermal heat pumps, extract heat from coils buried in the earth.
When you have completed this module, you will be able to do the following:
- Describe the principles of reverse-cycle heating.
- Identify heat pumps by type and general classification.
- Describe various types of geothermal water loops and their application.
- List the components of heat pump systems.
- Describe the role and basic operation of electric heat in common heat pump systems.
- Describe common heat pump ratings, such as Coefficient of Performance (COP), Heating Season Performance Factor (HSPF), and Seasonal Energy Efficiency Ratio (SEER).
- Demonstrate heat pump installation and service procedures.
- Identify and install refrigerant circuit accessories commonly associated with heat pumps.
- Analyze a heat pump control circuit.
- Isolate and correct malfunctions in a heat pump.
Module 03211-08 Troubleshooting Heat Pumps
This module explains the mechanical operation of a heat pump. A heat pump is a combination heating and cooling unit. It produces cooling in the same manner as a conventional cooling unit, and then reverses the cycle to produce heat. Both systems have the same components:
- Compressor
- Service valves
- Blower fan
- Condensor fan
- Condensor and evaporator coils
- Pressure and temperature controls
- Refrigerant and refrigerant lines
In addition to the typical air conditioning components listed, the heat pump requires a reversing valve and additional metering and control devices. Since heat pumps perform both heating and cooling functions, the coils are identified by location: the evaporating coil and condensing coil on an air conditioner are identified as the indoor coil and outdoor coil on a heat pump in the cooling mode. Why are heat pumps used? Heat pumps operate for about half the cost of electric resistance heat. Electric utilities offer customers, contractors, and developer’s rebates to install heat pumps. This is because electricity demand is low in the winter months, and heat pumps encourage customers to switch from oil or gas to electric utilities. Air Conditioning and Refrigeration Institute (ARI) statistics indicate that over one million heat pumps are sold each year. Besides being efficient to operate in the heating mode, a heat pump provides cooling. For heating purposes, a heat pump may or may not be less costly to operate than gas or oil heat, depending on the climate and fuel costs. However, it is likely to be more cost-effective for combined heating and cooling than other methods.
When you have completed this module, you will be able to do the following:
- Describe the basic operating sequence for an air-to-air heat pump.
- Interpret control circuit diagrams for heat pumps.
- Develop a checklist for troubleshooting a heat pump.
- Identify the tools and instruments used in troubleshooting heat pumps.
- Correctly use the tools and instruments required for troubleshooting heat pumps.
- Isolate and correct malfunctions in heat pumps.
- Describe the safety precautions associated with servicing heat pumps.
Module 03304-08 Retail Refrigeration Systems
This module explains the mechanical operation of refrigeration apparatus as applied in the retail refrigeration industry, including a discussion of specialized refrigerant circuit components. Because it is the goal of many systems to provide sub-freezing environments, approaches to defrosting the system will be examined. An assortment of retail fixtures and systems will be discussed, along with controls specific to their purpose. The troubleshooting and maintenance procedures for two distinctly different pieces of equipment are also presented.
When you have completed this module, you will be able to do the following:
- Describe the mechanical refrigeration cycle as it applies to retail refrigeration systems.
- Explain the differences in refrigerants and applications in low-, medium-, and high-temperature refrigeration systems.
- Identify and describe the primary refrigeration cycle components used in retail refrigeration systems.
- Identify and describe the supporting components and accessories used in retail refrigeration systems.
- Describe the various methods of defrost used in retail refrigeration systems.
- Identify and describe the applications for the various types of retail refrigeration systems.
- Describe the control system components used in retail refrigeration systems.
- Explain the operating sequence of a retail refrigeration system.
- Interpret wiring diagrams and troubleshooting charts to isolate malfunctions in retail refrigeration systems.
Module 03205-07 Leak Detection, Evacuation, Recovery and Charging
This module covers the basic service procedures and equipment used to troubleshoot, repair and/or maintain correct operation of the mechanical refrigeration system.
- Leak detection
- Evaluation and dehydration
- Recovery
- Charging
These service procedures are performed when installing new systems and when servicing existing ones. Failure to perform any one of these procedures correctly can result in poor system operation, and may even cause system failure. They must also be performed in order to make sure that the venting requirements of the Clean Air Act are not violated.
When you have completed this module, you will be able to do the following:
- Identify the common types of leak detectors and explain how each is used.
- Perform leak detection tests using selected methods.
- Identify the service equipment used for evacuating a system and explain why each item of equipment is used.
- Perform system evacuation and dehydration.
- Identify the service equipment used for recovering refrigerant from a system and for recycling the recovered refrigerant, and explain why each item of equipment is used.
- Perform a refrigerant recovery.
- Evacuate a system to a deep vacuum.
- Identify the service equipment used for charging refrigerant into a system, and explain why each item of equipment is used.
- Use nitrogen to purge a system.
- Charge refrigerant into a system by the following methods:
- Weight
- Superheat
- Charging pressure chart
H130-1 Advanced Associated Skills 6 Credits
This course is designed to provide an orientation to and practical experience in the HVAC trade. Students will understand work place expectations, responsibilities and terminology. Students will learn to use STP (Standard Trade Practices) methods of installation, troubleshooting and repair of cooling and refrigeration systems and the importance of professionalism in the work place.
MODULE OVERVIEW
Module 03206-07 Alternating Current
The electrical power used to operate HVAC equipment is alternating current, or AC power. Compressor motors, fan motors, and transformers depend on the constantly changing nature of AC to function. Because of its constantly changing nature, the principles you learned earlier about calculating voltage, current, resistance, and power cannot be directly applied to AC inductive circuits.
Objectives
When you have completed this module, you will be able to do the following:
- Describe the operation of various types of transformers.
- Explain how alternating current is developed and draw a sine wave.
- Identify single-phase and three-phase wiring arrangements.
- Explain how phase shift occurs in inductors and capacitors.
- Describe the types of capacitors and their applications.
- Explain the operation of single-phase and three-phase induction motors.
- Identify the various types of single-phase motors and their applications.
- State and demonstrate the safety precautions that must be followed when working with electrical equipment.
- Test AC components, including capacitors, transformers, and motors.
Module 03208-07 Introduction to Control Circuit Troubleshooting
Most malfunctions that occur in heating and air conditioning equipment are caused by failures in the power distribution or control system. In order to find and correct these malfunctions, service technicians must be able to interpret the schematic and wiring diagrams and other service literature provided by the manufacturer. The successful troubleshooter is able to read these diagrams and determine the correct operating sequence. Once the correct operating sequence is known, the troubleshooter can determine where the system has failed. Without that knowledge, troubleshooting is no more than a guessing game.
Objectives
When you have completed this module, you will be able to do the following:
- Explain the function of a thermostat in an HVAC system.
- Describe different types of thermostats and explain how they are used.
- Demonstrate the correct installation and adjustment of a thermostat.
- Explain the basic principles applicable to all control systems.
- Identify the various types of electromechanical, electronic, and pneumatic HVAC controls, and explain their function and operation.
- Describe a systematic approach for electrical troubleshooting of HVAC equipment and components.
- Recognize and use equipment manufacturer’s troubleshooting aids to troubleshoot HVAC equipment.
- Demonstrate how to isolate electrical problems to faulty power distribution, load, or control circuits.
- Identify the service instruments needed to troubleshoot HVAC electrical equipment.
- Make electrical troubleshooting checks and measurements on circuits and components common to all HVAC equipment.
- Isolate and correct malfunctions in a cooling system control circuit.
Module 0339-08 Troubleshooting Electronic Controls
Electromechanical controls such as bimetal thermostats and mechanical relays are common in older systems, but today’s heating and cooling systems rely on electronic control devices. This is true in applications ranging from the basic residential system to the largest commercial system. Troubleshooting of these modern control systems is very different. Electromechanical control systems use discrete components that can be readily tested and eliminated in case of an operating failure. In an electronic control system, the individual components are not accessible. They are mounted on PC boards, and in some cases are in sealed enclosures. They are treated as “black boxes” for troubleshooting purposes. If there is a control failure, the entire PC board or assembly is replaced. However, the troubleshooter must be able to determine if the control has actually failed before replacing it. This is a skill that requires the ability to analyze wiring diagrams and manufacturer operating sequence literature.
Objectives
When you have completed this module, you will be able to do the following:
- Describe the similarities and differences between electronic controls and conventional controls.
- Analyze circuit diagrams and other manufacturers’ literature to determine the operating sequence of microprocessor-controlled systems.
- Use test equipment to diagnose a microprocessor-controlled comfort system.
Module 03204-07 Air Quality Equipment
There are many accessories that can be added to an HVAC system in order to improve the comfort level and the quality of the air in a building. Other accessories can improve the operating efficiency of the system, resulting in lower cost to the user. The quality of the air we breathe in our homes and elsewhere is affected by dust, molds, and other contaminants. Some accessories are designed to eliminate these contaminants. Other accessories, such as humidifiers, are designed to overcome problems that reduce the indoor comfort level. Because these accessories have become very commonplace, it is essential that HVAC specialists know how to properly install and service them.
Objectives
When you have completed this module, you will be able to do the following:
- Explain why it is important to control humidity in a building.
- Recognize the various kinds of humidifiers used with HVAC systems and explain why each is used.
- Demonstrate how to install and service the humidifiers used in HVAC systems.
- Recognize the kinds of air filters used with HVAC systems and explain why each is used.
- Demonstrate how to install and service the filters used in HVAC systems.
- Use a manometer or differential pressure gauge to measure the friction loss of an air filter.
- Identify accessories commonly used with air conditioning systems to improve indoor air quality and reduce energy cost, and explain the function of each, including:
- Humidity control devices
- Air filtration devices
- Energy conservation devices
- Demonstrate or describe how to clean an electronic air cleaner.
Module 03312-08 Troubleshooting Accessories
Residential furnaces, especially in cold, dry northern climates, are often equipped with humidifiers to maintain a healthy moisture level in the indoor air. Electronic air cleaners may also be installed on residential heating and cooling equipment. The majority of specialized accessories are found on commercial systems, however. These accessories include economizers, energy/ heat recovery ventilators, and zone dampers. Servicing of equipment containing these devices requires specialized knowledge. This is especially true of economizers, because there are several types, each with its own special operating characteristics.
Objectives
When you have completed this module, you will be able to do the following:
- Describe a systematic approach for troubleshooting HVAC system accessories.
- Isolate problems with electrical and/or mechanical functions of HVAC system accessories.
- Use equipment manufacturer’s troubleshooting aids to troubleshoot HVAC system accessories.
- Identify and properly use the service instruments needed to troubleshoot HVAC system accessories.
- Troubleshoot problems in selected HVAC system accessories.
- State the safety precautions associated with the troubleshooting of HVAC accessories.
Module 03307-8 Planned Maintenance
Simple periodic servicing by qualified service technicians, such as replacing air filters and inspecting heat exchangers, allows systems to operate more efficiently and prevents premature equipment failures. In addition, periodic inspection can prevent harmful gases from threatening building occupants. Without scheduled maintenance, HVAC equipment will not perform properly or efficiently over the long term, and the useful life of the equipment will be reduced. In this module, you will learn about planned maintenance for residential and light commercial heating and cooling systems, as well as the accessories used with these systems. Proper tools and service procedures for planned maintenance of these systems and accessories are discussed.
Objectives
When you have completed this module, you will be able to do the following:
- Describe planned maintenance and service procedures required for selected HVAC equipment and components.
- Develop a planned maintenance and service checklist for selected HVAC equipment and accessories.
- Perform identified service and maintenance tasks on selected HVAC equipment, components, and accessories.
- Identify the tools and materials necessary for performing service and maintenance tasks.
- State the safety practices associated with the servicing of selected HVAC equipment, components, and accessories.
Module 03212-07 Basic Installation and Maintenance Practices
Anyone performing installation work must be familiar with mechanical devices such as fasteners and anchors, which are used to attach system components to mounting surfaces. These surfaces can be concrete, wood, or metal. There are many types of fasteners and anchors, and the installer must know which type to select for a given application. Large systems use more complex mechanical devices such as belt-driven fans, serviceable compressors, direct-drive compressors, and mechanically operated dampers. All of these devices require knowledge of special tools, materials, and methods.
Objectives
When you have completed this module, you will be able to do the following:
- Identify, explain, and install threaded and non-threaded fasteners.
- Identify, explain, remove, and install types of gaskets, packings, and seals.
- Identify types of lubricants, and explain their uses.
- Use lubrication equipment to lubricate motor bearings.
- Identify the types of belt drives, explain their uses, and demonstrate procedures used to install or adjust them.
- Identify and explain types of couplings.
- Demonstrate procedures used to remove, install, and align couplings.
- Identify types of bearings, and explain their uses.
- Explain causes of bearing failures.
- Demonstrate procedures used to remove and install bearings.
- Perform basic preventive maintenance inspection and cleaning procedures.
- List ways to develop and maintain good customer relations.
Module 03213-07 Sheet Meal Duct Systems
HVAC ductwork can be made of sheet metal or fiberglass ductboard. In addition, flexible metal duct can be used for branch runs in many applications. Because the interior surfaces of sheet metal ducts are smooth, these ducts offer less resistance to airflow than fiberglass ductboard. However, in many instances they must be insulated to reduce noise transmission and heat transfer. Therefore, working with sheet metal ductwork requires knowledge of various types of metals, insulation practices, as well as unique methods for joining and supporting sheet metal ductwork. Sheet metal ductwork systems also include additional components for safe and efficient air distribution, such as dampers, takeoffs, and zoning accessories.
Objectives
When you have completed this module, you will be able to do the following:
1. Identify and describe the basic types of sheet metal.
2. Define properties of steel and aluminum alloys.
3. Describe a basic layout method and perform proper cutting.
4. Join Sheet metal duct sections using proper seams and connectors.
5. Describe thermal and acoustic insulation principles.
6. Describe thermal and acoustic insulation principles.
7. Select, apply, and seal the proper insulation for sheet metal ductwork.
8. Describe guidelines for installing components such as registers, diffusers, grilles, dampers, access doors, and zoning accessories.
9. Install takeoffs and attach flexible duct to a sheet metal duct.
Module 03214-07 Fiberglass and Flexible Duct Systems
Fiberglass ductboard and flexible ducts (flex-duct) have become the standard for residential HVAC systems. Both fiberglass ductboard and flex-duct are lightweight and easy to handle. They are pre-insulated, so it is not necessary to add insulation as it is with sheet metal duct. Fiberglass ductboard is supplied in sheets that are easily assembled in the shop or on the job site. Flex-duct is preassembled, so it simply needs to be cut to the required length. These two types of ductwork are often combined in a system, with ductboard serving as plenums and trunk ducts, and flex-ducts serving as branch ducts. Anyone doing HVAC installation work needs to know how to assemble, join, and support these types of ductwork.
Objectives
When you have completed this module, you will be able to do the following:
1. Identify types of fiberglass duct, including flexible duct.
2. Describe fiberglass duct layout and some basic fabrication methods.
3. Describe the various closure methods for sealing fiberglass duct.
4. Fabricate selected duct modules and fittings using the appropriate tools.
5. Describe hanging and support methods for fiberglass tools.
6. Describe how to repair major and minor damage to fiberglass duct.
7. Install takeoffs and attach flexible duct to a fiberglass duct.
Module 03308-08 Water Treatment
If untreated water is used in hydronic heating and cooling systems, the systems will not operate efficiently and may eventually fail. Water contains minerals that can build up on system components and cause them to fail. When water comes into contact with air, organic matter, bacteria, and algae can form. Treatment of water with appropriate chemicals is therefore a necessity. In addition to chemical treatment, filters, strainers, water softeners, and other mechanical devices are used to keep water clean. These components require periodic servicing. A service technician may be required to test the water, either by using a test kit or by sending water samples to a designated laboratory. Based on the results of that testing, it may be necessary to add chemicals in order to keep the water clean.
Objectives
When you have completed this module, you will be able to do the following:
- Explain the reasons why water treatment programs are needed.
- List symptoms in heating/cooling systems that indicate a water problem exists.
- Describe the types of problems and related remedies associated with water problems that can occur in the different types of water and steam systems.
- Recognize and perform general maintenance on selected mechanical types of HVAC equipment that are used to control and/or enhance water quality.
- Use commercial water test kits to test water quality in selected water/steam systems.
- Perform an inspection/evaluation of a cooling tower or evaporative condenser to identify potential causes and/or existing conditions that indicate water problems.
- Clean open recirculating water systems and related cooling towers.
- Inspect, blowdown, and clean steam boilers
CD100 Career Development________________________________Credit Hours: 1
Upon completion of this course, the student should project a positive attitude, perform within ethical boundaries, conduct oneself in a courteous and diplomatic manner, show initiative and responsibility, promote the profession, listen and observe, adapt communication to individuals’ ability to understand, recognize and respond to verbal and non-verbal communication, evaluate understanding of communication, interview effectively, and compose written communication using correct grammar, spelling and format.
|
