HVAC-201. Syllabus. Prerequisites: HVAC-101and R-410a Safety Course (The R-410a Safety course may be completed while enrolled in HVAC201)

Transcription

1 HVAC-201 Syllabus Instructor: Jeremie Hedges (757) Contact Hours: 72 hours Prerequisites: HVAC-101and R-410a Safety Course (The R-410a Safety course may be completed while enrolled in HVAC201) Course Description: This course provides a more hands on experience to the concepts learned previously in HVAC 101. Students will complete numerous lab projects to gain proficiency with the fundamentals of air conditioning and refrigeration theory as well as mechanical and electrical troubleshooting. 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 Module 7 Module 8 Module 9 HVAC-101 Review (3 hr Lecture) Compressors MRAC Chapter 15 (3 hr Lecture) Valves & Metering Devices MRAC Chapter 16 (3hr Lecture) Ductless Air Conditioning Systems MRAC Chapter 25 (3 hr Lecture) Central Air Conditioning Systems MRAC Chapter 26 (3 hr Lecture) Thermostats, Air Conditioning Installation, Troubleshooting, and Service MRAC Chapters 29 & 31 (3 hr Lecture) Mid-term (3 hr Lecture / 3 hr Exam) Air Conditioning Installation, Troubleshooting, and Service (39hr Lab) Certification (9 hr Lab) Page 1 of 7

2 Module 1 HVAC-101 Review This module will provide a refresher on the key concepts covered during HVAC 101. It is highly recommended to review your course material and the information covered in chapters 1 10 of the MRAC. An understanding of the fundamentals of refrigeration covered in HVAC 101 is critical to the successful completion of HVAC 201. Differentiate between sensible heat and latent heat. Understand the purpose of each of the components in a compression refrigeration Describe how phase change is possible through pressure change or the addition or removal of heat. Complete various tubing and piping connecting procedures using approved methods. Use safe and accepted soldering and brazing techniques. Interpret pressure-temperature curves, pressure-enthalpy tables, and pressure-enthalpy diagrams. Recognize the various types of service valves used on refrigeration systems. Evacuate a refrigeration system using both deep vacuum and triple evacuation methods. Check refrigerant charge by determining a system s superheat or subcooling Charge a specific amount of refrigerant into a system as either a liquid or vapor. Charge a system with an inert gas to pressure test for leaks. Carry out refrigeration system leak repairs using either epoxy resin or brazing. Use various electrical meters to measure volts, amps and resistance Interpret diagrams of series, parallel, and complex circuits. Module 2 Compressors The compressor is the heart of the refrigeration As a technician you will be required to troubleshoot and service multiple types of refrigeration compressors. This module will provide a detailed description of compressor types, construction and application. Summarize the design differences between open-drive compressors, fully hermetic compressors, and semihermetic compressors. Identify the components of a reciprocating piston compressor and summarize their functions. Understand how a Scotch yoke type of reciprocating compressor works. Understand how a scroll compressor works. Explain how a screw compressor works. Identify the components of a centrifugal compressor and summarize their functions. Explain how a rotary compressor works. Identify and explain the purpose of compressor cooling and lubrication systems, mufflers, and crankcase heaters. Summarize the differences between rotating vane and stationary blade rotary compressors. Page 2 of 7

3 Module 3 Valves & Metering Devices In order for a refrigeration system to function properly, the proper quantity of refrigerant must be circulated through the system at the proper pressures. The metering device is a key component in ensuring this delicate balance between pressure and quantity. This module provides an in depth understanding of the multiple types of metering devices and how they operate. Summarize the purpose of metering devices. Summarize the design and function of an automatic expansion valves (AXVs). Categorize metering devices as modulating or fixed. Explain the design and function of common types of electronic expansion valves (EEVs). Summarize the design and function of capillary tube and fixed-orifice metering devices. Explain the design and function of common types of thermostatic expansion valves (TXVs). Understand the differences between high-side float (HSF) refrigerant controls and low-side float (LSF) refrigerant controls. Explain the design and function of other types of refrigerant control valves, including reversing valves, bypass valves, cut-off valves, and check valves. Module 4 Ductless Air Conditioning Systems Comfort cooling systems are systems that reduce the temperature and humidity in living and work spaces to a level comfortable for the occupants. All comfort cooling systems use one of the standard refrigeration cycles and standard refrigerants. This module will focus on various types of ductless cooling system, including self-contained units. Explain the purpose of comfort cooling systems. Identify the features of portable air conditioners. Compare remote cooling systems and self-contained Discuss the traits of packaged terminal air comfort cooling systems. conditioners. Summarize the characteristics of window- and wallmounted air conditioners. Identify the features of multizone ductless air conditioners Page 3 of 7

4 Module 5 Central Air Conditioning Systems The ability to comfortably and cost effectively condition the air within multiple rooms in homes has led to an increased demand in central air conditioning. What was once considered a luxury for homeowners is now a standard feature. Therefore, this module will familiarize you with the various systems that a technician may be required to work on.. Identify the characteristics of a central air-conditioning Explain the differences between unitary and fielderected air-conditioning systems. Identify the characteristics of a split air-conditioning Summarize the features of rooftop and outdoor airconditioning units. Explain the basic operation of a chiller Compare the different types of compressors that can be used in chiller systems. Summarize the basic operation of a water-cooled condenser. Explain the basic function and operation of a cooling tower. Identify the types of controls commonly used in central air-conditioning systems. Module 6 Thermostats, Air Conditioning Installation, Troubleshooting, and Service One of the most common controllers in the heating and cooling systems is the thermostat. A thermostat controls a system s starting and stopping when preset temperature conditions are reached. This module describes the basic components of thermostats and reviews specific thermostats in depth. This module will also introduce the procedures for installing, diagnosing, and servicing a variety of comfort cooling systems. The types of systems covered in this module include central air conditioning systems, ductless air conditioning systems, and humidifiers. Understand the differences among line-voltage, lowvoltage, and millivolt thermostat power sources. Evaluate a building to determine suitable locations for thermostats and remote sensing devices. Analyze temperature measurements and set points to determine if an HVAC system is exhibiting a wide temperature swing with system lag and system overshoot. Summarize the steps required to install central air conditioning. Identify the areas of a central air conditioning system that must be periodically inspected. Explain the tasks that must be completed as part of central air conditioning system service. Understand the purpose of anticipators in thermostats. Summarize the steps performed to install window and console air conditioning units. Page 4 of 7

5 Module 7 Midterm In this module you will be given an opportunity to test your mastery of modules 1 7 of the HVAC 201 course. 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 7. Module 8 Air Conditioning Installation, Troubleshooting, and Service This module gives the student an opportunity to apply the skills learned in both HVAC 101 and 201while servicing and troubleshooting actual systems. This portion is completely hands on and makes up the majority of the HVAC 201 course of instruction. Correctly wire a heat pump Install and troubleshoot thermostats Correctly size, bend, braze, and leak check copper Utilize system superheat and subcooling line-sets for a heat pump. measurements to troubleshoot. Properly evacuate and charge a heat pump Determine possible causes of low or high temperature and pressure measurements. Verify proper operation of heat pumps in various Explain the steps involved in window and modes. console air conditioning service. Test motor operations, repair and replace. Identify the various components of a split system Check the charge and operation of an air conditioning and the function of each component. Effectively service a residential central airconditioning Replace components in an air-conditioning system, Module 9 Certification In this module you will be given an opportunity to test your mastery of all of the HVAC 101and HVAC 201 course material. All testing will be conducted through practical assessments. This performance based assessment will require you to complete several tasks frequently performed by apprentice / journeyman HVACR technicians. Certification will be awarded upon satisfactory completion of the previous 9 modules of instruction and a minimum grade point average of 70%. Page 5 of 7

6 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 19% Homework 11% Practical Assessments (Labs) 32% Exams 38% 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 6 of 7

7 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 7 of 7