Commercial Refrigeration Systems

I.     Course Prefix/Number: AHR 201

       Course Name: Commercial Refrigeration Systems

       Credits: 4 (3 lecture; 3 lab)

II.    Prerequisite


III.   Course (Catalog) Description

Course covers entire refrigeration cycle, from compressor discharge to compressor suction, for low, medium, and high pressure refrigeration systems. Content includes various types of refrigeration systems; medium and low pressure temperature and their proper installations; product to be cooled, desired temperature to be maintained, humidity conditions, problems involving system balance and component capacity, and use of heat load charts. Students required to provide own basic tools.

IV.   Learning Objectives

After successful completion of this course the student will:

  1. Recognize any type of equipment used in Commercial Refrigeration and relate to its applications.
  2. Calculate the size and layout the commercial system needed to cool that product to design conditions.
  3. Layout and design the best method for controlling and maintaining said system at design conditions given a specific application.
  4. Learn how to layout and size system piping.
  5. Identify application and use of all commercial controls including defrost systems, winter operations controls, capacity reduction controls, system protection controls and other accessories controls.
  6. Develop fine tuning procedures, i.e. charging, adjustment of system components, system check-out.
  7. Trace and describe electrical control circuits used in commercial refrigeration.

Laboratory work will give the student time to apply the principles and procedures discussed in the test and during lectures.

V.    Academic Integrity and Student Conduct

Students and employees at Oakton Community College are required to demonstrate academic integrity and follow Oakton's Code of Academic Conduct. This code prohibits:

• cheating,
• plagiarism (turning in work not written by you, or lacking proper citation),
• falsification and fabrication (lying or distorting the truth),
• helping others to cheat,
• unauthorized changes on official documents,
• pretending to be someone else or having someone else pretend to be you,
• making or accepting bribes, special favors, or threats, and
• any other behavior that violates academic integrity.

There are serious consequences to violations of the academic integrity policy. Oakton's policies and procedures provide students a fair hearing if a complaint is made against you. If you are found to have violated the policy, the minimum penalty is failure on the assignment and, a disciplinary record will be established and kept on file in the office of the Vice President for Student Affairs for a period of 3 years.

Please review the Code of Academic Conduct and the Code of Student Conduct, both located online at

VI.   Sequence of Topics

  1. Refrigeration cycle applied to commercial
  2. Refrigerants used in commercial
  3. Compressors, evaporators
  4. TXV's – types and application
  5. Compressors
  6. Condensers
  7. Evaporators
  8. Control devices
  9. Refrigerant piping and accessories
  10. Refrigerant Equipment
  11. Methods of Defrosting and Other Control Circuits
  12. Commercial Refrigeration Load Calculations
  13. Proper Piping and Pipe Sizing
  14. Understanding Refrigeration Control Circuits

VII.  Methods of Instruction

The methods include lectures, videos, class discussions; a mixture of classroom exercise, and supervised hands-on experience in laboratory.
Course may be taught as face-to-face, hybrid or online course.

VIII. Course Practices Required

  1. All laboratory safety rules must be followed by students.
  2. The maximum allowed absences are six (6). Any more will result in a failing grade.
    (Three absences will lower your grade by one letter grade).
  3. All quizzes and exam must be completed.
  4. Three tardiness will be equal to one absence.
  5. Each student must participate in shop practices.
  6. Do not leave the class for the evening without notifying your instructor.
  7. The schedule of lecture and lab assignments is tentative. It may change as conditions dictate.
  8. Lecture attendance is mandatory.

IX.   Instructional Materials

Note: Current textbook information for each course and section is available on Oakton's Schedule of Classes.

Books to be chosen by the instructor.

X.    Methods of Evaluating Student Progress

  1. Quizzes, Mid-term and a comprehensive final exam.
  2. Assessment of performance on exercises and laboratory task.
  3. "Hands on" performance evaluation

XI.   Other Course Information

Three absences lowers the final letter grade three letters.  Six absences will result in failure of the course. All appropriate safety precautions must be observed during lab sessions.  Any accident must be reported immediately.  The lab must be cleaned and all equipment picked up before leaving.

If you have a documented learning, psychological, or physical disability you may be entitled to reasonable academic accommodations or services. To request accommodations or services, contact the Access and Disability Resource Center at the Des Plaines or Skokie campus. All students are expected to fulfill essential course requirements. The College will not waive any essential skill or requirement of a course or degree program.

Oakton Community College is committed to maintaining a campus environment emphasizing the dignity and worth of all members of the community, and complies with all federal and state Title IX requirements.

Resources and support for
  • pregnancy-related and parenting accommodations; and
  • victims of sexual misconduct
can be found at

Resources and support for LGBTQ+ students can be found at

Electronic video and/or audio recording is not permitted during class unless the student obtains written permission from the instructor. In cases where recordings are allowed, such content is restricted to personal use only. Any distribution of such recordings is strictly prohibited. Personal use is defined as use by an individual student for the purpose of studying or completing course assignments.

For students who have been approved for audio and/or video recording of lectures and other classroom activities as a reasonable accommodation by Oakton’s Access Disabilities Resource Center (ADRC), applicable federal law requires instructors to permit those recordings. Such recordings are also limited to personal use. Any distribution of such recordings is strictly prohibited.

Violation of this policy will result in disciplinary action through the Code of Student Conduct.