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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
- 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.
- 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)
- COURSE OUTLINE WITH UNIT OBJECTIVES
A. (UNIT 25) Refrigeration System Components
- The Four Basic Components
- Mechanical Controls
- Two-Temperature Controls
- Evaporator Pressure Control
- Multiple Evaporators
- Electric Evaporator
- Crankcase Pressure Regulator
- Adjusting the CPR Valve
- Relief Values
- Low Ambient Controls
- Fan-Cycling Head Pressure Controls
- Fan Speed Control for Controlling Head Pressure
- Air Volume Control for Controlling Head Pressure
- Condenser Flooding for Controlling Head Pressure
- The Solenoid Valve
- Pressure Switches
- Low-Pressure Switch
- Low-Pressure Control Applied as a Thermostat
- Automatic Pump down Systems
- High-Pressure Control
- Low-Ambient Fan Control
- Oil Pressure Safety Control
- Defrost Cycle
- Medium-Temperature Refrigeration
- Random or Off-Cycle Defrost
- Planned Defrost
- Low-Temperature Evaporator Design
- Defrost Using Internal Heat
- External Heat Type of Defrost
- Defrost Termination and Fan Delay Control
- Refrigeration Accessories
- Receivers
- The King Valve on the Receiver
- Filter Driers
- Refrigerant Check Valves
- Refrigerant Sight Glasses
- Liquid Refrigerant Distributors
- Heat Exchangers
- Suction-Line Accumulators
- Suction-Line Filter Driers
- Suction Service Valves
- Discharge Service Valves
- Refrigeration Line Service Valves
- Diaphragm Valves
- Ball Valves
- Oil Separators
- Vibration Eliminators
- Pressure Access Ports
- Crankcase Heat
B.(UNIT 26)Application of Refrigeration Systems
- Application Decisions
- Reach-In-Refrigeration
- Self-Contained Reach-In-Fixtures
- Individual Condensing Units
- Multiple Evaporators and Single-Compressor Systems
- Parallel Compressor Systems
- Secondary Fluid
- Pressurized Liquid System
- Unitary Stand-Alone
- Evaporator Temperature Control
- Interconnecting Piping in Multiple-Evaporator Installations
- Temperature Control of the Fixture
- The Evaporator and Merchandising
- Chest-Type Chest Fixtures
- Refrigerated Shelves
- Closed-Type Chest Fixtures
- Controlling Sweating on the Cabinet of Fixtures
- Maintaining Store Ambient conditions
- Walk-In Refrigeration
- Knock-Down Walk-In Coolers
- Walk-In Cooler Doors
- Evaporator Location in a Walk-In Cooler
- Condensate Removal
- Refrigeration Piping
- Package Refrigeration for Walk-In Coolers
- Vending Machine Refrigeration
- Water Coolers
- Refrigerated Air Driers.
C.Commercial Ice Machines (UNIT 27)
- Ice-Making Equipment, Packaged Type
- Making Flake Ice
- Making Cube Ice
- Microprocessors
- Making Cylindrical Ice
- Water and Ice Quality
- Package Ice Machine Location
- Troubleshooting Ice Makers
- Service Technician Calls
D.(UNIT 28)Special Refrigeration Applications
- Special Application Refrigeration
- Transport Refrigeration
- Truck Refrigeration Systems
- Railway Refrigeration
- Extra-Low Temperature Refrigeration
- Cascade Systems
- Quick Freezing Methods
- Marine Refrigeration
- Air Cargo Hauling
E.(UNIT 29) Troubleshooting and Typical Operating Conditions for Commercial Refrigeration
- Organized Troubleshooting
- Troubleshooting High-Temperature Applications
- Troubleshooting Medium-Temperature Applications
- Troubleshooting Low-Temperature Applications
- Typical Air-Cooled Condenser Operating Conditions
- Calculating the Correct Head Pressure for Air-Cooled Equipment
- Typical Operating Conditions for Water-Cooled Equipment
- Typical Operating Conditions for Wastewater Condenser Systems
- Typical Operating Conditions for Recirculated Water Systems
- Six Typical Problems
- Low Refrigerant Charge
- Refrigerant Over charge
- Inefficient Evaporator
- Inefficient Condenser
- Refrigerant Flow Restrictions
- Inefficient Compressor
- Compressor Vacuum Test
- Closed-Loop Compressor Running Bench Test
- Closed-Loop Compressor Running Field Test
- Compressor Running Test in the System
- Service Technician Calls
F.(UNIT 49) Cooling Towers and Pumps
- Cooling Tower Function
- Types of Cooling Towers
- Fire Protection
- Fill Material
- Flow Patterns
- Tower Materials
- Fan Section
- Tower Access
- Tower Sump
- Makeup Water
- Blow down
- Balancing the Water Flow for a Tower
- Water Pumps
- METHOD OF INSTRUCTION
A.Classroom lecture
B.Lab demonstrations
C.Specialty lectures by industry personnel
- REQUIRED TEXTBOOK WITH PUBLICATION INFORMATION
Whitman, Johnson, Tomczyk, Silberstein,Refrigeration and Air Conditioning Technology6th Ed., Delmar Publications. ISBN: 1-4283-1936-0
- REQUIRED MATERIALS (STUDENT)
Electronic Calculator with scientific notation, basic hand tools (As outline on attached tool list)
- SUPPLEMENTAL REFERENCES
Althouse, Turnquist, Bracciano, Modern Refrigeration and Air Conditioning, 18th edition, ISBN: 1-59070-280-8
- METHOD OF EVALUATION (BASIS FOR DETERMINING GRADE)
A.Theory—Tests, quizzes, homework 45%
B.Shop/Lab 45%
C.Instructor Evaluation, Attendance 10%
- 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).
- 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.