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JEFFERSONCOLLEGE

COURSE SYLLABUS

HRA 249

COMMERCIAL REFRIGERATION SYSTEMS

5 Credit Hours

Prepared by:

Roy H. Stueve

March 28, 2010

Mary Beth Ottinger, Division Chair

Elizabeth Check, Dean

Commercial Refrigeration Systems

  1. CATALOG DESCRIPTION

A.Prerequisite:HRA 101 and HRA 105

B.5 hour semester course

C.Commercial Refrigeration is a study of commercial systems used in retail and wholesale operations. The course sizing of condensing units with evaporators, commercial ice machines and special cooling operations. Also, cooling towers and pumps are covered with their maintenance procedures.

  1. EXPECTED LEARNING OUTCOMES / ASSESSMENT MEASURES

Students will understand two temperature controls, EPC, CPR, and EPR valves and their function within refrigeration system. / In class exam as well as homework and/or quizzes and/or in class projects.
Students will understand evaporation design and defrost systems. / (Same as above)
Students will disassemble and install mechanical refrigeration component parts and observe proper operation performance. / (Same as above)
Students will perform commercial refrigeration system piping / (Same as above)
Students will understand operation of crankcase heaters and check operation / (Same as above)
Students will understand multiple evaporator installations and their functions. / (Same as above)
Students will trouble shoot and service commercial ice machines. / (Same as above)
Students will trouble shoot and service commercial refrigeration systems. / (Same as above)
Students will understand operation of cooling towers and pumps and understand how to service these systems. / (Same as above)
  1. COURSE OUTLINE WITH UNIT OBJECTIVES

A. (UNIT 25) Refrigeration System Components

  1. The Four Basic Components
  2. Mechanical Controls
  3. Two-Temperature Controls
  4. Evaporator Pressure Control
  5. Multiple Evaporators
  6. Electric Evaporator
  7. Crankcase Pressure Regulator
  8. Adjusting the CPR Valve
  9. Relief Values
  10. Low Ambient Controls
  11. Fan-Cycling Head Pressure Controls
  12. Fan Speed Control for Controlling Head Pressure
  13. Air Volume Control for Controlling Head Pressure
  14. Condenser Flooding for Controlling Head Pressure
  15. The Solenoid Valve
  16. Pressure Switches
  17. Low-Pressure Switch
  18. Low-Pressure Control Applied as a Thermostat
  19. Automatic Pump down Systems
  20. High-Pressure Control
  21. Low-Ambient Fan Control
  22. Oil Pressure Safety Control
  23. Defrost Cycle
  24. Medium-Temperature Refrigeration
  25. Random or Off-Cycle Defrost
  26. Planned Defrost
  27. Low-Temperature Evaporator Design
  28. Defrost Using Internal Heat
  29. External Heat Type of Defrost
  30. Defrost Termination and Fan Delay Control
  31. Refrigeration Accessories
  32. Receivers
  33. The King Valve on the Receiver
  34. Filter Driers
  35. Refrigerant Check Valves
  36. Refrigerant Sight Glasses
  37. Liquid Refrigerant Distributors
  38. Heat Exchangers
  39. Suction-Line Accumulators
  40. Suction-Line Filter Driers
  41. Suction Service Valves
  42. Discharge Service Valves
  43. Refrigeration Line Service Valves
  44. Diaphragm Valves
  45. Ball Valves
  46. Oil Separators
  47. Vibration Eliminators
  48. Pressure Access Ports
  49. Crankcase Heat

B.(UNIT 26)Application of Refrigeration Systems

  1. Application Decisions
  2. Reach-In-Refrigeration
  3. Self-Contained Reach-In-Fixtures
  4. Individual Condensing Units
  5. Multiple Evaporators and Single-Compressor Systems
  6. Parallel Compressor Systems
  7. Secondary Fluid
  8. Pressurized Liquid System
  9. Unitary Stand-Alone
  10. Evaporator Temperature Control
  11. Interconnecting Piping in Multiple-Evaporator Installations
  12. Temperature Control of the Fixture
  13. The Evaporator and Merchandising
  14. Chest-Type Chest Fixtures
  15. Refrigerated Shelves
  16. Closed-Type Chest Fixtures
  17. Controlling Sweating on the Cabinet of Fixtures
  18. Maintaining Store Ambient conditions
  19. Walk-In Refrigeration
  20. Knock-Down Walk-In Coolers
  21. Walk-In Cooler Doors
  22. Evaporator Location in a Walk-In Cooler
  23. Condensate Removal
  24. Refrigeration Piping
  25. Package Refrigeration for Walk-In Coolers
  26. Vending Machine Refrigeration
  27. Water Coolers
  28. Refrigerated Air Driers.

C.Commercial Ice Machines (UNIT 27)

  1. Ice-Making Equipment, Packaged Type
  2. Making Flake Ice
  3. Making Cube Ice
  4. Microprocessors
  5. Making Cylindrical Ice
  6. Water and Ice Quality
  7. Package Ice Machine Location
  8. Troubleshooting Ice Makers
  9. Service Technician Calls

D.(UNIT 28)Special Refrigeration Applications

  1. Special Application Refrigeration
  2. Transport Refrigeration
  3. Truck Refrigeration Systems
  4. Railway Refrigeration
  5. Extra-Low Temperature Refrigeration
  6. Cascade Systems
  7. Quick Freezing Methods
  8. Marine Refrigeration
  9. Air Cargo Hauling

E.(UNIT 29) Troubleshooting and Typical Operating Conditions for Commercial Refrigeration

  1. Organized Troubleshooting
  2. Troubleshooting High-Temperature Applications
  3. Troubleshooting Medium-Temperature Applications
  4. Troubleshooting Low-Temperature Applications
  5. Typical Air-Cooled Condenser Operating Conditions
  6. Calculating the Correct Head Pressure for Air-Cooled Equipment
  7. Typical Operating Conditions for Water-Cooled Equipment
  8. Typical Operating Conditions for Wastewater Condenser Systems
  9. Typical Operating Conditions for Recirculated Water Systems
  10. Six Typical Problems
  11. Low Refrigerant Charge
  12. Refrigerant Over charge
  13. Inefficient Evaporator
  14. Inefficient Condenser
  15. Refrigerant Flow Restrictions
  16. Inefficient Compressor
  17. Compressor Vacuum Test
  18. Closed-Loop Compressor Running Bench Test
  19. Closed-Loop Compressor Running Field Test
  20. Compressor Running Test in the System
  21. Service Technician Calls

F.(UNIT 49) Cooling Towers and Pumps

  1. Cooling Tower Function
  2. Types of Cooling Towers
  3. Fire Protection
  4. Fill Material
  5. Flow Patterns
  6. Tower Materials
  7. Fan Section
  8. Tower Access
  9. Tower Sump
  10. Makeup Water
  11. Blow down
  12. Balancing the Water Flow for a Tower
  13. Water Pumps
  1. METHOD OF INSTRUCTION

A.Classroom lecture

B.Lab demonstrations

C.Specialty lectures by industry personnel

  1. REQUIRED TEXTBOOK WITH PUBLICATION INFORMATION

Whitman, Johnson, Tomczyk, Silberstein,Refrigeration and Air Conditioning Technology6th Ed., Delmar Publications. ISBN: 1-4283-1936-0

  1. REQUIRED MATERIALS (STUDENT)

Electronic Calculator with scientific notation, basic hand tools (As outline on attached tool list)

  1. SUPPLEMENTAL REFERENCES

Althouse, Turnquist, Bracciano, Modern Refrigeration and Air Conditioning, 18th edition, ISBN: 1-59070-280-8

  1. METHOD OF EVALUATION (BASIS FOR DETERMINING GRADE)

A.Theory—Tests, quizzes, homework 45%

B.Shop/Lab 45%

C.Instructor Evaluation, Attendance 10%

  1. ADA STATEMENT

Any student requiring special accommodations should inform the instructor and the Coordinator of Disability Support Services (Library; phone 636-797-3000, ext.169).

  1. ACADEMIC HONESTY STATEMENT

All students are responsible for complying with campus policies as stated in the Student Handbook (see College website).

Heating refrigeration and Air Conditioning

Hand Tool List

All of the tools on the following list will be used in the first and second years of training. All tools and equipment should be marked for identification. Any used tools or similar equipment is acceptable provided they are safe to use and are adequate for the program. The tools marked with an * may be purchased through different suppliers at a student discount.

!Padlock with keys or combination lock

!Tool pouch with belt or small tool box

!VOM Fieldpiece SC76

!Pump (multi-pliers) pliers – insulated handle only – 10”

!Screwdriver pocket size – square tip

!Screwdriver 6” blade – square tip – insulated handle only

!Screwdriver 6” blade – Phillip’s-tip – insulated handle only or multi-bit or combination set

!Long-nose (needle-nose) pliers #6 – insulated handle only

!Slip-joint (wire pliers) pliers #6 – insulated handle only

!Diagonal (side cutters) pliers #6 – insulated handle only

!Protective (safety) glasses, clear glass w/side shields only (students must have and use safety glasses in the shop area at all times)

!Center punch

!Hammer ball being 8 oz. (no claw hammer)

!*Allen Screw Wrench set #TL16 or equal (must have 6” shafts)

!Nut Driver Set 3/16” to ½” (or socket set)

!6-piece open-end wrench set 3/8” to 11/16” (or box-end wrench set)

!8” adjustable wrench

!Steel-tape rule 6”

!Robinair gauge manifold set #40153 or equal

!10” adjustable wrench

!Tool box with tray

!*Flaring tool set 3/16” to 5/8”

!*Tube cutter 3/16”to 5/8”

!*Swaging tool set 3/16” to 5/8” (5pc)

!*Tubing reamer #208F

!*Thermometer pocket -20˚ to 220˚ F (no glass)

!*Reversible ratchet wrench ¼”, 3/8”, 3.16”, 5/16”

!*Tubing cutter, small (lmp) TC1050

!*Constrictor wheel #76637

Shop Work Schedule

All shop work assignments are in Lab Manual Refrigeration and Air Conditioning Technology 6th Ed. Delmar Cengage Learning, Assignments in lab manual will follow scheduled theory lecture chapters. Chapter one In Theory Textbook Refrigeration & Air Conditioning Technology by Bill Whitman, Bill Johnson, John Tomczk, and Eugene Silberstein will be chapter one in lab manual Refrigeration and Air conditioning Technology.