HVA 220 COMMERCIAL AND DOMESTIC REFRIGERATION

HVA 220 COMMERCIAL AND DOMESTIC REFRIGERATION PRESENTED AND APPROVED: AUGUST 9, 2012 EFFECTIVE: FALL 2013-14

Prefix & Number HVA 220 Course Title: Commercial and Domestic Refrigeration Purpose of this submission: New X Change/Updated Retire If this is a change, what is being changed? Update Prefix X Course Description (Check all that apply) Title Course Number Format Change Credits X Prerequisite Competencies Textbook/Reviewed Competencies-no changes needed Does this course require additional fees? X No Yes If so, please explain. Is there a similar course in the course bank? X No Yes (Please identify) Articulation: Is this course or an equivalent offered at other two and four-year universities in Arizona? X No Yes (Identify the college, subject, prefix, number and title: Is this course identified as a Writing Across the Curriculum course? X No Yes Course Textbook, Materials and Equipment Textbook(s) Current edition Title Commercial and Domestic Refrigeration, 7 th Edition Author(s) Whitman, Johnson, Tomczyk Publisher Thompson Delmar Learning ISBN 9781111644475 Software/ Equipment Title Author(s) Publisher N/A Course Assessments Description of Possible Course Assessments: Exams standardized for this course? Midterm X Final Other (Please specify): Where can faculty members locate or access the required standardized exams for this course? (Contact Person and Location) Student Outcomes: Identify the general education goals for student learning that is a component of this course. Quizzes, tests, written homework assignments, lab assignments, lab final examination, written final examination. Are exams required by the department? No X Yes If Yes, please specify: Lab final examination, written final examination Ken Kramer, HVAC Instructor, Bullhead Campus 1) Apply the basic principles of refrigeration to domestic and commercial refrigeration applications such as ice-making equipment, water coolers, reach-in and walk-in coolers and freezers. 2) Demonstrate the maintenance, service, and troubleshooting procedures required for

domestic and commercial low and medium temperature erature systems. 3) Apply the proper procedures used to check the refrigerant metering device operation and complete system charging using refrigerant weight as well as superheat and sub-cooling. 4) Identify and describe different refrigeration systems used in commercial cargo transport. 5) Identify and describe different control systems used on large commercial refrigeration equipment. 6) Identify and describe the operation of energy efficient refrigeration systems including condenser heat reclaim used to heat structures. Check all that apply: 1. Communicate effectively. a. Read and comprehend at a college level. X b. Write effectively in a college setting. Method of Assessment Reading assignments and then complete written homework assignments based on those reading assignments. 2. Demonstrate effective quantitative reasoning and problem solving skills. X Complete refrigerant charging and unit operation analysis procedures using mathematical calculations. 3. Demonstrate effective qualitative reasoning skills. X Complete refrigeration system troubleshooting using electrical and mechanical diagnosis procedures. 4. Apply effective methods of inquiry. a. Generate research paper by gathering information from varied sources, analyzing data and organizing information into a coherent structure. b. Employ the scientific method. 5. Demonstrate sensitivity to diversity a. Experience the creative products of humanity. b. Describe alternate historical, cultural, global perspectives. Office of Instruction Use only: CIP Code: ONET Code: Minimum Qualifications:

COURSE INFORMATION Initiator: Ken Kramer, Frank Port Date of proposal to Curriculum Sub-Committee: August 9, 2012 Effective Semester/Year Fall 2013 Spring Summer Course description and prerequisite will be reflected in the 2013-14 catalog year. Prefix & Number: HVA 220 Full Title: Commercial and Domestic Refrigeration Short Title: Refrigeration Catalog Course Description: Covers the use of refrigeration theory in both low and medium temperature domestic and commercial refrigeration systems. The operation of commercial and domestic ice making equipment, water coolers, refrigerators, and walk-in coolers and freezers will be discussed and practiced. Charging and evacuation techniques, as well as mechanical and electrical troubleshooting and repair will be covered. Energy efficient refrigeration systems including heat reclaim will be discussed. SUN Course Number: Credit Hours: 3 Lecture Hours: 2 Lab Hours: 2 Prerequisite(s): Successful completion of HVA 105 or permission of Academic Chair. Co-requisite(s) Intended Course Goals By the end of the semester, students will be able to: 1. Apply the basic principles of refrigeration to domestic and commercial refrigeration applications such as ice-making equipment, water coolers, reach-in and walk-in coolers and freezers. 2. Demonstrate the maintenance, service, and troubleshooting procedures required for domestic and commercial low and medium temperature systems. 3. Apply the proper procedures s used to check the refrigerant metering device operation and complete system charging using superheat and sub-cooling. 4. Identify and describe different refrigeration systems used in commercial cargo transport. 5. Identify and describe different control systems used on large commercial refrigeration equipment. 6) Identify and describe the operation of energy efficient refrigeration systems including condenser heat reclaim used to heat structures.

Course Competencies and Objectives By the end of the semester, students will be able to: Competency 1 Distinguish the function and characteristics of a compressor as used in a refrigeration system and residential HVAC systems. Objective 1.1 Describe the function of the compressor in a refrigeration system. Objective 1.2 Define compression ratio, and describe the impact of compressor design on the compression ratio. Objective 1.3 Describe four different methods of creating compression. Objective 1.4 List and describe specific conditions under which a compressor is expected to operate. Objective 1.5 Compare and contrast a hermetic compressor and a semi-hermetic compressor. Objective 1.6 Compare and contrast a reciprocating and rotary compressor, and describe the working components relative to each compressor. Objective 1.7 Demonstrate the proper safety procedures required while working around moving parts such as pulleys, belts, or fan blades. Competency 2 Describe the function of the expansion device in commercial refrigeration applications. Objective 2.1 Identify and describe the three most popular types of expansion devices. Objective 2.2 Describe the operating characteristics of the three most popular expansion devices and how they respond to load changes. Objective 2.3 Describe the operation of a balanced port expansion valve and a dual-port expansion valve, and analyze the conditions in which each type is utilized. Objective 2.4 Demonstrate the function of electronic expansion valves and how they are Controlled. Analyze the conditions in which electronic expansion valves are utilized. Competency 3 Identify and describe the application of refrigeration to commercial systems such as chest-type display fixtures, walk-in coolers, beverage coolers and dispensers. Objective 3.1 List and describe the types of display equipment that utilize refrigeration. Objective 3.2 Analyze the processes used for heat reclaim. Objective 3.3 Compare and contrast package and remote condensing applications. Objective 3.4 Define mullion heat and analyze its impact upon commercial refrigeration systems. Objective 3.5 Describe the various defrost methods utilized in commercial refrigeration systems. Objective 3.6 Identify the commercial systems that utilize walk-in refrigeration and analyze their differences. Objective 3.7 Describe the operation of basic vending machine refrigeration. Objective 3.8 Describe the operation of a refrigerated air-dry unit and identify the refrigeration systems that utilize it. Objective 3.9 Demonstrate a typical system service call including basic preventive maintenance procedures and troubleshooting techniques. Competency 4 Describe the application of refrigeration to ice-making package equipment. Objective 4.1 Analyze the use of the basic refrigeration cycle for ice flake machines. Objective 4.2 Describe and demonstrate basic maintenance and troubleshooting techniques used for servicing ice flake machines. Objective 4.3 State the purpose of the water fill system in an ice flake machine. Objective 4.4 Explain the purpose of a flush cycle in an ice flake machine. Objective 4.5 Describe the purpose of a bin control in an ice flake machine. Objective 4.6 Read and interpret ice production and performance charts for ice machines.

Objective 4.7 Compare and contrast the processes used to make crescent-shaped ice and cell-type ice cubes. Objective 4.8 Identify and describe the sequence of steps used by an ice machine. Objective 4.9 Describe the harvest cycle and analyze its importance in sequence of operation of an ice-machine. Objective 4.10 Identify the functions that are under microprocessor control in an ice machine. Objective 4.11 Explain input/output troubleshooting for microprocessors and analyze its importance for ice-machine servicing. Objective 4.12 Analyze the impact of water and ice quality to ice making. Objective 4.13 Compare and contrast cleaning and sanitizing procedures utilized for servicing an ice machine. Objective 4.14 List and describe the processes that can be used for water filtration and treatment. Objective 4.15 Demonstrate the safe and correct use of cleaning and sanitizing chemicals when servicing an ice-machine. Objective 4.16 Demonstrate a typical system service call including basic preventive Competency 5 Identify and describe the use of refrigeration in trucking, rail, marine, and air cargo applications. Objective 5.1 Describe the methods used for refrigerating trucks. Objective 5.2 Define phase change plates and analyze their used in truck refrigeration. Objective 5.3 Identify and describe methods used for hauling refrigerated freight on rail. Objective 5.4 Describe the use of the refrigeration cycle for blast cooling and cascade refrigeration. Objective 5.5 Identify and describe the basic methods used for marine refrigeration. Objective 5.6 Describe and demonstrate the proper use of PPE and the safety precautions required when working with liquid nitrogen and liquid-carbon dioxide. Objective 5.7 Demonstrate a typical system service call including basic preventive Competency 6 Demonstrate the basic troubleshooting and servicing techniques utilized for commercial refrigeration applications, including air and water-cooled equipment. Objective 6.1 Identify and plot the typical operating temperatures and pressures for the low pressure side of a refrigeration system at high, medium and low temperature. Objective 6.2 Identify and plot the operating pressures and temperatures for the high pressure side of the system. Objective 6.3 Describe the characteristics of different refrigerants on the high-pressure and low-pressure sides of the system. Objective 6.4 Demonstrate the troubleshooting techniques required to diagnose an inefficient evaporator, condenser or compressor. Objective 6.5 Demonstrate the proper use of PPE when attaching and removing gages, and when transferring refrigerant or checking pressures. Objective 6.6 Demonstrate a typical system service call including basic preventive Competency 7 Describe the application of the refrigeration cycle to domestic refrigeration systems, such as refrigerators and ice-makers. Objective 7.1 Describe the refrigeration cycle for household refrigeration systems. Objective 7.2 Describe the types, physical characteristics, and typical locations of the evaporator, compressor, condenser, and metering devices. Objective 7.3 List and explain the defrost cycle used in domestic refrigeration systems.

Objective 7.4 Describe and demonstrate the procedure for disposing of condensate. Objective 7.5 Identify and describe the most commonly used refrigerator designs, and analyze the advantages and disadvantages of each. Objective 7.6 Explain the purpose of mullion and panel heaters. Objective 7.7 Identify and describe the electrical controls commonly used in household refrigerators. Objective 7.8 Describe the operation of the ice-maker typically found in a domestic refrigerator. Objective 7.9 Demonstrate a typical service call including basic preventive maintenance procedures and troubleshooting techniques on domestic refrigeration systems such as household refrigerators. Objective 7.10 Demonstrate the electrical safety precautions required when servicing or troubleshooting the electrical circuits found in domestic refrigeration systems. Competency 8 Describe the application of the refrigeration cycle to domestic freezers. Objective 8.1 Compare and contrast the construction of typical freezer cabinets and domestic refrigerators. Objective 8.2 Identify three types of freezer evaporators and describe their operation. Objective 8.3 Identify two types of freezer compressors and describe their operation. Objective 8.4 Describe how natural-draft condensers are utilized. Objective 8.5 Identify the capillary tube in a freezer and describe its function. Objective 8.6 Analyze the impact of ambient air to the efficiency of the condenser.. Objective 8.7 Describe and demonstrate the procedures required to defrost a freezer manually. Objective 8.8 Describe the procedures that may be used to remove spoiled food odors from the freezer cabinet. Competency 9 Describe the application of the refrigeration cycle to room and or portable air conditioning units. Objective 9.1 Describe the procedures used to install window air-conditioning units. Objective 9.2 Analyze the impact of window design upon the design of the room air conditioning unit. Objective 9.3 List the major components in the refrigeration cycle of a window cooling unit. Objective 9.4 Explain the purpose of the heat exchange between the suction line and the capillary tube. Objective 9.5 Describe the heating cycle in the heat pump or reverse cycle room air conditioner. Objective 9.6 Describe the typical controls found on room air-conditioning (cooling) units. Objective 9.7 Describe the process for determining whether or not to use gages. Objective 9.8 List and demonstrate the procedures required to charge a room air conditioner. Objective 9.9 Demonstrate a typical system service call including basic preventive