New Course OR Existing Course Instructor(s)/Author(s): John Henry Subject Area/Course No.: ACREF-073 Units: 2 Course Name/Title: Commercial Refrigeration Technology Discipline(s): Air Conditioning, Refrigeration & Heating; Appliance Repair; Electricity; Electromechanical Technology Pre-Requisite(s): None Co-Requisite(s): None Advisories: Eligibility for ENGL-095; ETEC-004; MATH-007 Catalog Description: An introductory course in commercial refrigeration systems which provides a background in the scientific principles related to heat and temperature, and transfer of heat. This course includes a study of the basic refrigeration cycle, the function of each system component, and interrelationships between components. Applied refrigeration concepts will be covered in demonstrations in the classroom, labs, and computer simulations. Schedule Description: Are you a hands-on type of student, but still want to learn the reasons behind how things work? This course teaches you how to accurately operate, maintain, diagnose, and repair commercial refrigeration systems. You will use computer simulators and specially designed hands-on training units, as well as build and operate a refrigeration system from the ground up to reinforce your understanding of the theory and concepts. Hours/Mode of Instruction: Lecture 27 Lab 44 Composition Activity Total Hours 71 (Total for course) Credit Credit Degree Applicable (DA) Grading Pass/No Pass (P/NP) Repeatability 0 Credit Non-Degree (NDA) Letter (LR) 1 (If Non-Credit desired, contact Dean.) Student Choice (SC) 2 3 Please apply for: LMC General Education Requirement and/or Competency & Graduation Requirement(s): None Transfer to: CSU UC IGETC LDTP Course is Baccalaureate Level: Yes No Page 1 of 11
Signatures: Department Chair Librarian Dean/Sr. Dean Curriculum Committee Chair President/Designee CCCCD Approval (Board or Chancellor's Office) For Curriculum Committee Use only: STAND ALONE COURSE: YES NO FOR OFFICE OF INSTRUCTION ONLY. DO NOT WRITE IN THE SECTION BELOW. Begin in Semester Catalog year 20 /20 Class Max: Dept. Code/Name: T.O.P.s Code: Crossover course 1/ 2: ESL Class: Yes / No DSPS Class: Yes / No Coop Work Exp: Yes / No Class Code A Liberal Arts & Sciences SAM Code A Apprenticeship Remediation Level B Basic Skills B Developmental Preparatory B Advanced Occupational NBS Not Basic Skills C Adult/Secondary Basic Education C Clearly Occupational D Personal Development/Survival D Possibly Occupational E For Substantially Handicapped E* Non-Occupational F Parenting/Family Support F Transfer, Non-Occupational G Community/Civic Development *Additional criteria needed H General and Cultural 1 One level below transfer I Career/Technical Education 2 Two levels below transfer J Workforce Preparation Enhanced 3 Three levels below transfer K Other non-credit enhanced Not eligible for enhanced Course approved by Curriculum Committee as Baccalaureate Level: _Yes / No_ LMC GE or Competency Requirement Approved by the Curriculum Committee: Page 2 of 11
Institutional Student Learning Outcomes General Education SLOs (Recommended by GE Committee) At the completion of the LMC general education program, a student will: 1. Read critically and communicate effectively as a writer and speaker. 2. Understand connections among disciplines and apply interdisciplinary approaches to problem solving. 3. Think critically and creatively 4. Consider the ethical implications inherent in knowledge, decision-making and action. 5. Possess a worldview informed by diverse social, multicultural and global perspectives. Occupational Education SLOs (Recommended by Occupational Education Committee) At the completion of the LMC occupational certificate or degree, a student will: 1. Be academically prepared to obtain an entry-level or a mid-level position in their industry. 2. Apply critical thinking to research, evaluate, analyze and synthesize information. 3. Demonstrate strong communication skills (written and/or oral) and interpersonal skills (customer service and team work). 4. Appropriately apply industry materials and technology. 5. Demonstrate the skills and knowledge necessary to take and pass certification exams for career advancement in their industry. Developmental Education SLOs (Recommended by Developmental Education Committee) At the completion of the LMC Developmental Education Program, a student will: 1. Demonstrate the skills necessary for the first transfer level courses in English and Math or for the English and Math competencies for the Certificate of Achievement. 2. Think critically to construct meaning and solve problems. 3. Read with comprehension. 4. Communicate effectively both in writing and orally. 5. Demonstrate the characteristics, habits, and attitudes of an effective learner. Student Services SLOs 1. LMC students will demonstrate proficiency in the use of college on-line services. 2. LMC students will demonstrate proficiency in self-advocacy. Library and Learning Support Services SLOs LMC students utilizing various Library and Learning Support Services will: 1. Access and effectively utilize available campus Library and Learning Support Services. 2. Apply knowledge learned and competencies gained from using Library and Learning Support Services to academic coursework and assignments. 3. Demonstrate information competency skills needed to meet the research demands of academic course work and life long learning. None of the Above Page 3 of 11
Program-Level Student Learning Outcomes (PSLOs) At the completion of the program, the student should be able to: 1. Diagnose a system problem; determine what type of test equipment to use and make an estimate of what will have to be done to complete the repair. (OESLO 1, 2, 4) 2. Demonstrate problem solving techniques used in troubleshooting to determine whether the problem is electrical or mechanical failure and how to isolate the cause. (OESLO 1, 2, 4) 3. Use written or oral service directions that are used in the HVAC/R field be able to demonstrate mechanical knowledge by diagnosing the failure, and locating and replacing the proper component. (OESLO 3) 4. Locate service materials electronically to diagnose an electrical problem using a schematic diagram and sequence chart. (OESLO 2) 5. Demonstrate the skills and knowledge necessary to take and pass exams required for employment in the HVAC/R field. (OESLO 5) 6. Prepared for entry level employment in the HVAC/R field by passing an industry employment test and obtaining a job in that field. (OESLO 5) Course-Level Student Learning Outcomes (CSLOs): At the end of this course, the student will be able to: CSLO 1 Apply physical science principles of electricity and magnetism, air flow, heat, pressure, matter, and energy to the maintenance, operation, diagnosis, and repair of refrigeration systems. (PSLO 1, 2, 3, 5) CSLO 2: Use test equipment (ohmmeter, voltmeter, wattmeter, ammeter, pressure and temperature measuring and recording equipment) appropriately in refrigeration system maintenance, operations, diagnosis, and repair (PSLO 1, 2, 3, 6) CSLO 3: Demonstrate safe work practices with pressurized vessels and systems, electrical energy, heat, cold, rotating machinery, chemicals, and heavy objects (PSLO 1, 2 6) CSLO 4: Inspect a refrigeration system to determine if it is operating correctly, identify any needed checks and tests, and develop and implement a repair strategy (PSLO 1, 2, 3, 4, and 6) CSLO 5: Assemble, operate, troubleshoot, and repair a refrigeration system (PSLO 1, 5, 6) CSLO 6: Use appropriate non-technical skills involved in servicing refrigeration equipment (PSLO 5) Page 4 of 11
Assessment Criteria: CSLO 1 Accurately map out refrigeration system problems using schematic diagrams Explain and measure the operation of valves, solenoids, and other components Use pressure/temperature charts and other tools to determine air properties under various conditions CSLO 2 Accurately use mechanical and electronic test instruments Accurately measure voltage, current, and resistance on basic cooling circuits Use test equipment to trace electrical circuits and identify potential problems using a schematic Troubleshoot electrical components using energized and de-energized tests CSLO 3 Complete a safety test and contract at the beginning of the semester Complete lab assignments in a safe manner Always wear PPE as needed and encourage others to do the same CSLO 4 Take accurate measurements of temperature, pressures and calculate their interrelationship Test a malfunctioning refrigeration compressor to properly assess the problem and recommend a solution. Measure air output of fans to determine proper operation. CSLO 5 Demonstrate correct brazing techniques on copper and steel pipe and tubing Demonstrate an understanding of electrical circuitry by properly wiring training unit Accurately troubleshoot and repair problems on the assembled training unit. CSLO 6: Demonstrate appropriate customer interaction in a typical service call (role play) Demonstrate proper ergonomics in the shop, office, and truck environment. Demonstrate a simulation of parts ordering and ticket completion Assessments: Homework 10% Labs 40% Notebook 10% Tests 20% Final 20% CSLO 1 2 6 2 3 3 CSLO 2 2 8 2 3 3 CSLO 3 8 1 3 3 CSLO 4 2 8 2 4 4 CSLO 5 2 10 2 4 4 CSLO 6 2 1 3 3 Page 5 of 11
On the final exam and tests, CSLOs #1-6 will be assessed in a comprehensive fill-in-the-blank, multiple choice, and short essay type written final. Students will also demonstrate the ability to quickly and correctly diagnose a problem with altered refrigeration systems, training units, or computer simulations. The CSLOs are based on CORE Competencies established by the HVAC/R industry and national certification tests. CSLO 1: Apply physical science principles of electricity, magnetism, air flow, heat, pressure, matter, and energy to the maintenance, operation, diagnosis, and repair of refrigeration systems. homework problem asks students to research the effects a partially or fully obstructed evaporator or condenser would have on system temperatures and pressures. Labs: Labs ask students to apply what they learned from completing the homework and what was covered in class. For example, students are given sub-components of refrigeration systems and are asked to determine whether they are properly operating, using principles of electricity and magnetism. The professor assesses each student s participation in the lab. Notebook: Students compile a notebook with course materials that include course notes, handouts, previous labs and homework regarding physical science principles. During the labs, students are to use and refer to the notebook to complete the lab assignment and the professor regularly checks the students notebooks to make sure they have all the required information. The notebook is meant to be a field reference guide once the course is completed. Tests and Final: Students are given section tests and a final that ask students to solve problems that require the use of physical science principles. In an example problem, a student is given several voltages, currents, and resistances of circuit subcomponents, and is asked to determine the voltages, currents, and resistances of the rest of the circuit and what components are operating. CSLO 2: Use test equipment appropriately in refrigeration system maintenance, operations, diagnosis, and repair. homework problem asks students to determine if a compressor is operating efficiently given a set of pressures and temperatures Labs: Labs ask students to apply what they learned from completing the homework and what was covered in class regarding test equipment. The professor assesses each student s participation in the lab. For example, students perform a physical inspection and series of temperature measurements on a refrigeration system, record findings on the service record and perform needed calculations to determine operating efficiency. They write their conclusions, noting the overall condition of the equipment and identify any items needing corrective action. After consulting with the instructor, they correct deficiencies and update the service record. Notebook: Students compile a notebook with course materials that include course notes, handouts, previous labs and homework regarding physical science principles. During the labs, students are to use and refer to the notebook to complete the lab assignment and the professor regularly checks the students notebooks to make sure they have all the required information. The notebook is meant to be a field reference guide once the course is completed. Page 6 of 11
Tests and Final: Students are given section tests and a final that ask them to solve problems that require them to use test equipment appropriately. In an example problem, a student is given several components on a bench and using test instruments is asked to determine whether the component is functional or not. The student must provide data from the instruments to support their conclusion. CSLO 3: Demonstrate safe work practices with pressurized vessels and systems, electrical energy, heat, cold, rotating machinery, chemicals, and heavy objects homework problem that allows students to demonstrate their knowledge about safe work practices asks them to identify the hazards one might encounter when brazing a section of pipe. Students may be given a picture and asked to identify potential hazards. Further, students must suggest ways to mitigate any identified hazards. Labs: In the lab, students work with pressurized vessels and systems, electrical energy, heat, cold, rotating machinery, chemicals, heavy objects, and ventilation system. The professor observes students participation in the lab and application of safe work practices. Notebook: Students compile a notebook with course materials that include course notes, handouts, previous labs and homework regarding physical science principles. During the labs, students are to use and refer to the notebook to complete the lab assignment and the professor regularly checks the students notebooks to make sure they have all the required information. The notebook is meant to be a field reference guide once the course is completed. Tests and Final: Students are given section tests and a final that ask them to solve problems demonstrating safe work practices. They may be given an energized portion of a refrigeration system and are asked to demonstrate how to safely use instruments to obtain required data. The professor observes and evaluates whether the student is using the equipment appropriately, following safe work practices. CSLO 4: Inspect a refrigeration system to determine if it is operating correctly, identify any needed checks and tests, and develop and implement a repair strategy homework problem asks students to develop a diagnostic strategy based on a given set of operating conditions. Labs: Students will be given a refrigeration system that is not operating correctly. They will need to inspect the refrigeration system to determine the problem(s), identify any needed checks and tests, and develop and implement a repair strategy. The professor assesses each student s participation in the lab. Notebook: Students compile a notebook with course materials that include course notes, handouts, previous labs and homework regarding the process and procedures to inspect, test and diagnose and develop the repair strategies. During the labs students are to use and refer to the notebook to complete the lab assignment and the professor regularly checks the students notebooks to make sure they have all the required information. The notebook is meant to be a field reference guide once the course is completed. Tests and Final: Students are given section tests and a final that ask students to inspect a refrigeration system to determine if it is operating correctly, identify any needed checks and tests, and develop and implement a repair strategy. The student is given a set of conditions and based on that information and using the materials learned in the course the student demonstrates that they can solve the problem. Page 7 of 11
CSLO 5: Assemble, operate, troubleshoot, and repair a refrigeration system. homework problem asks them to identify the major electrical components of such system and how they interconnect.. Labs: Students will assemble a refrigeration system from a set of components given to them. They will braze all sealed system components, wire electrical devices, and properly charge the system so that it operates correctly. The professor assesses each student s participation in the lab and the level of assistance needed compared to peers. Notebook: Students compile a notebook with course materials that include course notes, handouts, previous labs and homework regarding the process and procedures to test and diagnose and make recommendations regarding refrigeration operation and repair. During the labs students are to use and refer to the notebook to complete the lab assignment and the professor regularly checks the students notebooks to make sure they have all the required information. The notebook is meant to be a field reference guide once the course is completed. Tests and Final: Students are given section tests and a final. For a portion of those assessments, they are asked identify and repair bugs that the professor has put into their system CSLO 6: Use appropriate non-technical skills involved in servicing refrigeration equipment. homework problem would be to list local and state regulations that apply to refrigeration servicing. Labs: Students demonstrate a service call and role play the servicer and/or customer to practice customer interaction skills. They are asked to dress appropriately for that activity and may be videotaped. The professor assesses each student s participation in the lab. Notebook: Students observe videos of customer interaction skills and watch other students role playing. They compile a notebook of their observations and best practices. The professor regularly checks the students notebooks to make sure they have all the required information. The notebook is meant to be a field reference guide once the course is completed. Tests and Final: Students are given section tests and a final that ask student to view videos of customer interactions, and are asked to identify and note the areas where the servicer positively interacted with the customer as well as opportunities for improvement. Method of Evaluation/Grading: Learning objectives will be evaluated through homework, tests, written assignments, lab exercises, and field activities. Assignments emphasizing key concepts, principles, and procedures will be used in comparing problems on different types of refrigeration systems and components. Course Grade will be determined by a weighted mean (average) of the evaluation instruments, and based on a weighted scale. Labs: A minimum of ten labs will be given throughout the semester. Students will apply what was learned in class presentations and discussion, outside reading, homework, internet sources, and demonstration by the instructor. Students will be expected to work safely, properly use all tools and equipment, meet the lab objectives, perform all needed calculations, and to write up conclusions. Page 8 of 11
Evaluation Instruments Grading Scale Homework 10% A = 90 100% Labs 40% B = 80 89% Notebook 10% C = 70 79% Tests 20% D = 60 69% Final 20% F = Below 60% Total 100% A-level student work is characterized by homework that is answered thoroughly, accurately and often includes an example; labs where the student follow all instructions, helps other students and uses their notebook as a guide to perform lab exercises and answer questions with accuracy, procedurally correctly, and safely in an efficient time period; a notebook that includes 90% of the course notes, handouts, previous labs and homework and is compiled in an organized manner; and tests and final where students answer the written portions in detail, accurately and completely often including an example and in the hands-on portion work accurately, safely and efficiently to solve the problem. C-level student work is characterized by homework that is answered accurately; labs where the student follows instructions with additional guidance and uses their notebook as a guide to perform lab exercises but may not have all the required information so they require additional support, they answer the lab questions with 70% accuracy, using safe methods but inefficient use of time; a notebook that includes 70% of the course notes, handouts, previous labs and homework; and tests and final where students answer the written portions with 70% accuracy and in the hands-on portion work safely with 70% accuracy and efficiency to solve the problem. CSLOs are generally weighted: CSLO 1 -- 16% CSLO 2 -- 18% CSLO 3 -- 15% CSLO 4 -- 20% CSLO 5 -- 22% CSLO 6 -- 9% Course Content: Logistics Introductions, Course outline, Policies Blackboard Safety Intro, evacuation procedures Shop safety test Codes and Standards Applicable sections of Mechanical, Building, Electrical, and Plumbing codes Applicable sections of Title 24 State Energy Code Electrical Fundamentals Ohms Law -- Current, Voltage, and Resistance Circuit Fundamentals series and parallel circuits Power, single and three phase Transformers, relays, and contactors Page 9 of 11
Wiring Diagrams Ladder and schematic -- Diagnostics Refrigeration tools and equipment Pipe and tubing Pipe fitting and sizes Hand tools, gauges, Instruments Welding and brazing equipment Service valves, Service evacuation Test equipment Science related to Refrigeration Heat, Heat Flow, Heat Transfer, Matter, and Energy Sensible and Latent Heat Refrigerant identification, classification, regulations Pressure-temperature measurement, curves and relationship Major Refrigeration System Basics Sealed System Components (compressor, condenser, metering, evaporator) Sealed System Operations Electrical Components (fans, switches, controls, relays, defrosters, lighting) Interaction of components Refrigeration System General Types Expendable refrigeration, shipping and trucking applications Single Compressor Systems Compound, Cascading, Modulating systems Thermoelectric and Absorption systems Operating sequencing, Troubleshooting for commonly used units Refrigeration System Specific Applications Door and doorless systems Open and closed deli counters Floral and other specialized systems Vending cases Reach-in units Walk-in units Simulation Computer refrigeration simulation Built-up refrigeration fabrication, operation, and testing Specialized hands-on refrigeration training unit simulation Ice making machines System configuration Ice shapes and types Ice making methods and the evaporator Harvest cycle Bin and machine controls Water quality and water treatment Troubleshooting EPA section 608 Refrigerant Handling Certification Page 10 of 11
Core, Type I, II, and III Certifications Stratospheric ozone depletion, Ozone depletion potential Clean Air Act, Montreal Protocol, CFCs, HCFCs, HFCs Blends, Azeotropic refrigerants, Fractionation, Temperature glide Recovery, recycling, and reclamation Recovery requirements, cylinders, techniques, and equipment Safety, Sales restrictions, Shipping Dehydration, Substitute refrigerants and oils Leak detection requirements, techniques, and equipment Leak repair requirements, techniques, and equipment Recharging techniques and equipment Proctored EPA Test Non Technical Skills Customer contact and relations Grooming and presentation Personal ergonomics Service truck organization Parts ordering and stocking Service Ticket management Basic local and state regulations and licensing Special Topics System component energy use and loss Survey of energy efficiency strategies and products Ice Storage and emerging technologies Instructional Methods: Lecture Lab Activity Problem-based Learning/Case Studies Collaborative Learning/Peer Review Demonstration/Modeling Role-Playing Discussion Computer Assisted Instruction Other (explain) Textbooks: Modern Refrigeration and Air Conditioning, 18 th edition. Althouse, Turnquist, and Bracciano, Goodheart-Wilcon Company, Inc. 2004 Instructor assembled handouts on specific manufacturer or advanced techniques Factory Service Websites Electrical review websites CD, YouTube, and other presentations Simulation software Already in the computer labs for student use Page 11 of 11