Advanced Refrigeration Systems

I.     Course Prefix/Number: AHR 211

       Course Name: Advanced Refrigeration Systems

       Credits: 4 (3 lecture; 2 lab)

II.    Prerequisite

AHR 201 or consent of department chair

III.   Course (Catalog) Description

Course covers direct expansion cooling, tube-in-tube and shell-and-tube water cooled condensers, and proper setting of water regulation valves.  In the lab, mechanical and electrical malfunctions are simulated to enable students to learn causes for malfunction, diagnostics, and corrective repairs.

IV.   Learning Objectives

•    Apply safety procedures
•    Explain properties of refrigerants
•    Illustrate  relationship of temperature and heat energy
•    Plot refrigeration cycle on pressure-enthalpy charts
•    Evaluate heat transfer for equipment performance
•    Select proper refrigerant oils for appropriate refrigerant
•    Use instruments to locate leaks
•    Identify cause and effect of various problems associated with DX cooling, shell-and-tube and tube-in-tube water cooled condensers
•    Recognize performance problems and equipment failures
•    Apply EPA regulations for refrigerant removal in a safe and legal manner
•    Demonstrate procedure for charging a refrigeration system
•    Explain and demonstrate use of various flow control devices
•    Explain and demonstrate use and setting of pressure controls

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)    Safety
2)    Properties of refrigerants
3)    Temperature and heat energy
4)    The refrigeration cycle
5)    Pressure-Enthalpy Charts
6)    Heat transfer
7)    Refrigerant oils
8)    Leak detection
9)    Refrigerant removal from system in a safe and legal manner
10)    Charging a refrigeration system
11)    Liquid flow control devices
12)    Pressure controls

VII.  Methods of Instruction

Classroom instruction and laboratory exercises.
Course may be taught as face-to-face, hybrid or online course.

VIII. Course Practices Required

A.    All laboratory safety rules must be followed by students.
B.    All quizzes and exams and lab assignments must be completed.
C.    Frequent tardiness will result in an absence.
D.    Each student must participate in class/shop practices.
E.    Do not leave the class for the evening without notifying your instructor. It may result as an absence from the class.
F.    Safety goggles must be worn at all times in the lab during lab.
G.    All tools, instruments and equipment borrowed in the lab must be returned to their appropriate place, and clean-up work area. Students are required to have their own basic tools.

IX.   Instructional Materials

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

1)     Hampden Trainer operating instructions. (Copy will be made available to students for lab use).
2)     Refrigeration and Air conditioning Technology, latest edition.
Published by Delmar.

X.    Methods of Evaluating Student Progress

Average of mid-term and final exam. Completion of lab experiments to the satisfaction of teaching faculty for trouble shooting procedures.
Three (3) absences lower grade one letter; six (6) absences results in “F” grade.

XI.   Other Course Information

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