HVAC-101. Syllabus. Prerequisites: EPA 608 Certification (EPA certification may be completed while enrolled in HVAC 101)

Transcription

1 HVAC-101 Syllabus Instructor: Jeremie Hedges (757) Contact Hours: 72 hours Prerequisites: EPA 608 Certification (EPA certification may be completed while enrolled in HVAC 101) Course Description: This course is designed to present a working foundation of refrigeration, air conditioning and heat pump theory and application, plus a basic knowledge of electrical troubleshooting and reading of schematic wiring diagrams. Text/Reference: Modern Refrigeration and Air Conditioning (MRAC) 19 th Edition, Althouse, Turnquist, Bracciano Course Outline: Module 1 Module 2 Module 3 Module 4 Module 5 Module 6 Fundamentals of Refrigeration MRAC Chapter 1(3hr Lecture) Basic Refrigeration Systems MRAC Chapter 2 (6hr Lecture) Tools & Supplies MRAC Chapter 3 (3 hr Lecture) Working w/ Tubing & Piping MRAC Chapter 4 (3hr Lecture / 6hr Lab); Introduction to Refrigerants MRAC Chapter 6 (3hr Lecture) Mid-term (3 hr Lecture / 3 hr Exam) Module 7 Equipment & Instruments for Refrigerant Handling & Service MRAC Chapter 7 (3hr Lecture / 6hr Lab) Module 8 Module 9 Module 10 Module 11 Working w/ Refrigerants MRAC Chapter 8 (3hr Lecture / 9hr Lab) Basic Electricity MRAC Chapter 9 (3hr Lecture / 3hr Lab) Electrical Power MRAC Chapter 10 (3hr Lecture / 3hr Lab) Certification (3hr Lecture / 6 hr Exam / Lab) Page 1 of 8

2 Module 1 Fundamentals of Refrigeration In order to diagnose and repair heating and refrigeration systems, technicians must have a good understanding of the scientific principles at work within the systems. This module will use simple and clear language to explain the science on which heating and refrigeration technology is based. Differentiate between matter and energy. Summarize the relationship between force, work, and power. Differentiate between the Fahrenheit, Celsius, Rankine, and Kelvin temperature scales. Use the appropriate formulas to calculate enthalpy, specific enthalpy, and changes in heat for a given substance. Compare the radiation, convection, and conduction methods of heat transfer. Illustrate the differences between the three states of matter. Differentiate between sensible heat and latent heat. Illustrate the effect of pressure and heat on the three states of matter. Differentiate between gauge pressure and absolute pressure. Integrate the concepts of Boyle s law and Charles law to explain the combined gas law. Predict the effect of a drop in temperature or an increase in pressure on a saturated vapor. Summarize the relationships between mass, weight, and density. Explain the concepts of specific gravity and relative density. Compare the different units used to measure refrigeration effect. Module 2 Basic Refrigeration Systems The purpose of any refrigeration system is to remove heat from a space where it is not wanted. This module will introduce the basics of how a compression refrigeration system operates and explain the purpose of each component in the system. Explain how phase changes are used in refrigeration systems to transfer heat. Describe how phase change is possible through pressure change or the addition or removal of heat. Summarize the four phases of the compression refrigeration cycle. Identify the components that divide the low and high sides of a compression refrigeration system. Understand the purpose of each of the components in a compression refrigeration system. Page 2 of 8

3 Module 3 Tools & Supplies The tasks involved in HVACR work encompass those of a number of trades. This requires the use of a variety of tools, instruments, and supplies. General hand tools are required for mechanical work. Electrical instruments, pressure gauges, and heat-sensing instruments are needed for electrical, pressure, and temperature measurements. Sheet metal tools are necessary for assembling ductwork. This module will cover the tools, instruments, and supplies most commonly used in HVACR work. Explain how to use various hand tools. Select the appropriate tool for a specific task. Monitor temperature with various thermometers. Identify different types of fastening methods and devices. Compare cleaning methods and the use of various solvents. Identify basic supplies needed on a typical installation or service call. Follow approved safety procedures. Module 4 Working w/ Tubing & Piping It is important for the technician to be familiar with the types and uses of tubing and piping in the HVACR field. Accurate modification of tubing and piping provides the basis for an effective service call. When servicing a system, a technician must use proper cutting and joining techniques to ensure both the technician s own safety and the quality of work. Distinguish among the various types of tubing and piping used in refrigeration work. Explain the uses of the various types of tubing and piping in refrigeration work. Perform tube cutting and bending procedures using proper methods. Complete various tubing and piping connecting procedures using approved methods. Use safe and accepted soldering and brazing techniques. Follow approved safety procedures. Page 3 of 8

4 Module 5 Intro to Refrigerants There have been many attempts to find refrigerant that is effective, safe, cost efficient, and environmentally harmless. This search resulted in the development of CFCs in the 1930 s, such as R-12, which have since been banned due to its impact on the environment. Next came the development of HCFC refrigerants, such as R-22, which many of today s technicians are very familiar with. However they are scheduled for a total ban by 2030, to be replaced by HFC refrigerants such as R-134a and R410A. This module will address the environmental impact, application, and identification of these refrigerants. Recognize the effect of halogenated refrigerants on the ozone layer. Summarize Environmental Protection Agency regulations governing refrigerants. Differentiate between CFC, HCFC, HFC, and blended refrigerants. Identify refrigerants according to their series number and cylinder color code. Interpret pressure-temperature curves, pressureenthalpy tables, and pressure-enthalpy diagrams. Summarize the properties and common applications of different refrigerants. Identify which types of refrigerants are compatible with which lubricants. Module 6 Midterm Exam In this module you will be given an opportunity to test your mastery of modules 1 6 of the HVAC 101 course. A three hour lecture will provide a quick review of the key concepts presented in modules 1 through 6. Testing will be in the form of a written exam consisting of 50 questions covering the fundamental knowledge requirements expected of successfully completing modules 1 through 6. Module 7 Equipment & Instruments for Refrigerant Handling & Service HVACR technicians must be certified by the EPA to handle refrigerants in cylinders and charge them back into refrigeration systems. This module covers the specialized equipment used to handle refrigerants, perform refrigeration system service, and pull a vacuum. Methods of detecting refrigeration system leaks will also be covered in this module. Distinguish between the different types of refrigerant cylinders and identify the proper use of each type. Identify the different kinds of pressure gauges and how they are used. Recognize the various types of service valves used on refrigeration systems. Understand the purpose, construction, and operation of a gauge manifold. List the types of leak detection methods and their advantages and disadvantages. Explain the purpose for using a vacuum pump. Describe the types of equipment used for refrigerant recovery and recycling. Page 4 of 8

5 Module 8 Working w/ Refrigerants Most service and repair procedures require a system to be emptied of refrigerant. This module will explain recovery methods and techniques. Other standard service procedures covered in this module include checking refrigerant charge, repairing refrigerant leaks, evacuating a system, and charging a system with refrigerant. Check refrigerant charge by determining a system s superheat or subcooling. Implement both passive and active refrigerant recovery procedures. Charge a system with an inert gas to pressure test for leaks. Carry out refrigeration system leak repairs using either epoxy resin or brazing. Evacuate a refrigeration system using both deep vacuum and triple evacuation methods. Charge a specific amount of refrigerant into a system as either a liquid or vapor. Follow approved safety procedures when recovering and charging refrigerant. Module 9 Basic Electricity Many of the components in an HVACR system are electrically operated. Having a good understanding of basic electricity, electrical circuits, and the relationship between electricity and magnetism will help a technician install and troubleshoot electrical and electronic components. Identify the parts of an atom. Use Ohm s law to explain the mathematical relationship among voltage, current, and resistance. Contrast the properties and applications of static electricity, direct current, and alternating current. Summarize the three types of materials used in electrical and electronic parts and systems. Design diagrams of series, parallel, and complex circuits. Use formulas to calculate the voltage drop across an electrical load. List the components of an electromagnet and factors that affect the strength of its magnetic field. Explain how electrical generators use magnetism to create electricity. Summarize how electricity flows between the coils of a transformer. Page 5 of 8

6 Module 10 Electrical Power To understand electrical power, a technician must first understand how to calculate power in a circuit, and how factors such as resistance and capacitance affect a circuit s power. In this module we will review the types of power supplies, overcurrent protection devices, and common electrical problems that will make diagnosing electrical issues much easier for the HVACR technician. Use mathematical formulas to calculate root mean square values, apparent power, and power factor. Summarize how resistance, inductive reactance, and capacitive reactance cause power loss and affect power factor in circuits. Understand the difference between single-phase and three-phase power. Define a Class 2 circuit and identify the types of electrical connections an HVACR technician is permitted to make. Recall wire size terminology and connect wires using wire terminals and crimping. Explain the importance of properly grounding and bonding an electrical system. Describe the purpose and operation of various overcurrent protection devices used in circuits. Identify the different types and causes of common electrical problems. Module 11 Certification In this module you will be given an opportunity to test your mastery of all of the HVAC 101 course material. A three hour lecture will provide a quick review of the key concepts presented in all of the modules presented in the HVAC 101 course. Testing will be two parts, a written exam and a performance based exercise. The written exam will be 100 questions covering the fundamental knowledge requirements expected of an apprentice / journeyman HVACR technician. The performance based portion will require you to complete several tasks frequently performed by apprentice / journeyman HVACR technicians. Certification will be awarded upon satisfactory completion of the previous 10 modules of instruction and a minimum grade point average of 70%. Page 6 of 8

7 Instructional Philosophy Class starts at 5:30 pm and ends at 8:30 pm. The days of instruction will be posted on the Blue Crab Appliance Parts training calendar. (Calendars are available at the parts counter and will be provided upon enrollment to any course of instruction.) The number of instructional days per week will vary depending on the length of the module being administered. The practical assessments (labs) are a key area of instruction and provide the students an opportunity to apply concepts learned in the lectures to a hands on exercise. Students will work both independently and in work groups during practical assessments. Course Grades The grades for this course will be determined as follows: Tests 32% Homework 16% Practical Assessments (Labs) 30% Exams 22% There will be a test after the completion of each module. In the case of classes being called off for any reason on the day of a scheduled test, the test will be given at the next scheduled class meeting. Make up test may be administered at a time designated by the instructor. Homework will be assigned daily and is considered due at the beginning of the next class meeting. Practical assessments will be assigned a total point value and will be administered as follows: Pass or Fail: Cumulative Points A total point score will be assigned to the assessment. The student must successfully complete the required task with no assistance from the instructor or other students to earn the total point value. If the student fails to perform the objective(s) no points will be awarded. A total point score will be divided among several relevant Job Standards for the assessment being performed. Students will earn points based on the level of proficiency observed by the instructor in each of the job standard categories. The total points earned by the student will then be converted into a percentage grade. See example below: Cumulative Point Example Standards Score Scoring Guidelines Preparation Cannot explain anything about the lab = 0 Can explain everything about the lab = 20 Components Cannot correctly identify any components = 0 Can correctly identify any components = 20 Heating Cycle Cannot correctly trace the heating cycle = 0 Can correctly trace the heating cycle = 20 Cooling Cycle Cannot correctly trace the cooling cycle = 0 Can correctly trace the cooling cycle = 20 Charging Chart Cannot determine if charge is correct = 0 Can determine if charge is correct = 20 Total Max = 100 Pts Page 7 of 8

8 Course Grades (cont.) Final course grades will be assigned according to the following scale: A 90% or greater B 80% to less than 90% C 70% to less than 80% D 60% to less than 70% F less than 60% Attendance/Tardiness/Disenrollment: Students cannot miss more than 3 days of instruction and tardy hours will be deducted from the student total hours. A minimum of 63 hours is required to receive a certification of completion. Students must give a disenrollment notice 48 hours prior to the start of any course of instruction to receive a 100% refund of the enrollment fee. A 50% refund will be given for any disenrollment occurring no later than the second class convening. Any disenrollment occurring after the second class convening will result in a complete forfeiture of enrollment fees. All disenrollment notifications must be presented in writing. Sales of textbooks and course materials are nonrefundable. Safety Violations: Students are required to adhere to all safety procedures while attending any instruction, whether in a classroom or lab environment. Violations of safety procedures could result in a failure of the performance objective being assessed. Repetitive violations could result in disenrollment from the course of study and forfeiture of all enrollment fees. Page 8 of 8