10601334Commercial Refrigeration Systems
Course Information
Description
This course covers the operation, control and maintenance of commercial ice makers, rack style parallel refrigeration equipment used in grocery store applications, walk in and reach in coolers and freezers, and other specialty equipment. Refrigerant handling and recovery will be emphasized.
Total Credits
3
Course Competencies
  1. Practice shop safety
    Assessment Strategies
    Written objective test, lab performance
    Criteria
    Describe basic shop safety rules.
    Perform lockout / tag-out procedures.
    Choose the correct personal protective equipment for given tasks.
    Identify potential safety hazards that can be minimized by shop cleanliness.
    Describe safe practices for lifting and transporting heavy objects.
    Handle tools and chemicals appropriately.

  2. Evaluate operation of domestic refrigerators and freezers
    Assessment Strategies
    Written objective test, lab performance, drawing/illustration
    Criteria
    Identify all system components.
    Record pressures and temperatures during the refrigeration cycle.
    Adjust and test operation of operating and safety controls.
    Construct a system wiring diagram.
    Write the order of operations for the unit.
    Cycle unit through defrost and record pressures and temperatures.
    Construct a wiring diagram.

  3. Evaluate a semi-hermetic compressor
    Assessment Strategies
    Written objective test, lab performance, drawing/illustration
    Criteria
    Tear down a semi-hermetic compressor.
    Inspect internal compressor components.
    Complete a manufacturer’s compressor inspection report.
    Reassemble the compressor.

  4. Evaluate a semi-hermetic compressor
    Assessment Strategies
    Lab performance, project analysis
    Criteria
    Isolate the compressor body.
    Recover refrigerant from the compressor body.
    Remove and replace the compressor.
    Remove and replace the compressor oil.
    Leak test the system.
    Evacuate the body to below 500 microns.
    Pump the system down and replace the filter drier.
    Evaluate system performance as compared to the manufacturer's specifications.

  5. Evaluate commercial refrigeration systems, including their electrical circuits, and write a sequence of operation for each
    Assessment Strategies
    Formal demonstration, written product
    Criteria
    Must pass written and lab (hands-on) examinations by designing a circuit and writing a sequence of operation.
    Refer to syllabus for grading scale.
    Review typical supermarket system electrical diagrams.
    Revise a supermarket system electrical diagram.
    Design a supermarket system electrical diagram.

  6. Evaluate the operation of commercial coolers and freezers
    Assessment Strategies
    Written test, project work
    Criteria
    Identify all system components.
    Record pressures and temperatures during the refrigeration cycle.
    Adjust and test operation of operating and safety controls.
    Write the order of operations for the unit.
    Construct a system wiring diagram.
    Remove and replace a system part using proper field procedures.

  7. Diagnose typical commercial and domestic refrigeration system problems using manifold gauges, diagrams, technical manuals and appropriate test instruments
    Assessment Strategies
    Formal demonstration, lab performance, written product
    Criteria
    Pass written and lab (hands-on) examinations by interpreting wiring diagrams and diagnosing system problems.
    Refer to syllabus for grading scale.
    Analyze a system using manufacturer's information.
    Analyze a wiring diagram.
    Articulate a diagnostic procedure.
    Analyze individual circuits of the system.

  8. Set up a walk-in cooler / freezer combination
    Assessment Strategies
    Lab performance
    Criteria
    Remove and replace a walk-in cooler / freezer.
    Remove and replace refrigeration equipment serving a walk-in cooler / freezer.
    Construct and disassemble a walk-in cooler / freezer.
    Construct a refrigeration system for a walk-in cooler / freezer.
    Appraise running condition of the walk-in cooler / freezer.
    Determine the correct refrigerant charge for the walk-in cooler / freezer.

  9. Analyze components and circuits specific to ice machine systems
    Assessment Strategies
    Lab performance, written product, drawing/illustration
    Criteria
    You must pass written and lab (hands-on) examinations by analyzing components and circuits. Refer to syllabus for grading scale.
    Summarize thermostats and pressure controls.
    Analyze thermostats and pressure controls.
    Describe the purpose of the following circuits: ice making, harvest cycle, water quality, and prechill.
    Diagram individual ice machine circuits.
    Analyze individual ice machine circuits.

  10. Construct piping diagrams of ice machine systems
    Assessment Strategies
    Drawing/illustration, written product
    Criteria
    Draw piping diagrams and identifying system components.
    Summarize motor and control circuits.
    Record unit order of operation.

  11. Evaluate the operation of ice machines
    Assessment Strategies
    Drawing/illustration, lab performance, written test
    Criteria
    View and diagram an actual ice machine piping layout.
    Identify system accessories correctly.
    Locate and record information from a system nameplate.
    Describe different ice harvest methods.  
    Interpret Manufacture sequence of operations and timing graphics.

  12. Analyze components and circuits specific to supermarket rack systems
    Assessment Strategies
    Lab performance, project analysis, written product, written objective test
    Criteria
    Explain thermostat and pressure control functions and operations.
    Complete lab tasks on a heating / cooling thermostat.
    Complete lab tasks on low and high-pressure switches.
    Must pass written and lab (hands-on) examinations by analyzing components and circuits. Refer to syllabus for grading scale.
    Describe the purpose of the following components and circuits: defrost, oil pressure failure, solid state pressure control, solid state time, and heat recovery.
    Diagram typical supermarket rack system circuits.  
    Analyze typical supermarket rack system circuits.

  13. Summarize the operation of a supermarket rack system cases, temperature control, defrost, heat reclaim, EPR valves and oil control system
    Assessment Strategies
    Lab performance, project analysis, drawing/iIlustration, written product
    Criteria
    Diagram a refrigerated case and piping showing how it is connected to the rack system.
    Determine case defrost type and test operation.
    Study Commercial Refrigeration Supermarket Handbook and complete a rack lab assignment leak test to the system.
    Identify accessories specific to supermarket rack systems.
    Outline the use of multiple evaporators on a rack system.
    Outline the storage of refrigerated products.
    Outline the need for defrost.
    Describe the different defrost methods.
    Outline the use of heat reclaim.

  14. Analyze supermarket rack system service procedures and problems
    Assessment Strategies
    Lab performance, written product, written objective test
    Criteria
    Solve system problems after analyzing a system.
    Use a recovery machine to recover system refrigerant.
    Isolate a case on the rack system by using the proper isolation valves.
    Identify many common refrigeration system problems.
    Describe common problems associated with: defrost, oil pressure failure, solid-state pressure control, solid-state timer, and heat recovery.
    Diagnose problems using a troubleshooting analysis form.