HVAC 204 - Commercial Refrigeration

1. Demonstrate safe practices and procedures in the lab.
2. Describe the application and function of specialized commercial refrigeration components covered in the course (both electrical controls as well as refrigeration flow controls).
3. Identify common mechanical and electrical controls found on commercial A/C and refrigeration systems covered in this course.
4. Describe electric defrost systems and the function of the system components.
5. Describe hot gas defrost systems and the function of the system components.
6. Analyze operating conditions of medium and low temperature refrigeration systems.
7. Adjust the superheat setting of a thermostatic expansion valve.
8. Apply the refrigeration cycle to the operation of commercial refrigeration equipment.
9. Outline various different methods for charging commercial refrigeration systems having either air-cooled or water-cooled condensers.
10. Determine cut-in and cut-out pressure settings for pressure controls for direct temperature control, pump down and condenser fan cycling.
11. Compare and contrast the different designs of commercial ice machines covered in this course.
12. Describe the different means of initiating harvest cycle, terminating harvest cycle and determining when the storage bin is full that are used on commercial ice machines.
13. Describe the different means of low ambient control covered in this course.
14. Explain the requirements for evaporator coil TD for low temperature commercial refrigeration, and high humidity and general purpose medium temperature storage. [TD = EAT - BP where EAT is evaporator entering air temperature and BP is evaporator refrigerant boiling point temperature.]
15. Attain readiness to take the ESCO HVAC Excellence Employment Ready Exam.

CERTIFICATION STATEMENT:

Ivy Tech cannot guarantee that any student will pass a certification or licensing exam. Your success will be determined by several factors beyond the instruction you are given in the classroom including your test-taking skills, your willingness to study outside of class, and your satisfactory completion of appropriate practice exams. Certification and licensure exam questions are drawn from databases of hundreds of possible questions; therefore, a thorough understanding of the subject matter is required. Ivy Tech’s coursework is designed to assist you in understanding the material sufficiently to provide a firm foundation for your studies as you prepare for the exam.

COURSE CONTENT: Topical areas of study include -  

• The refrigeration cycle as it applies to commercial refrigeration equipment
• Medium and low temperature reach-in and walk-in coolers
• Commercial ice machines
• Specialized commercial electrical and refrigeration system components
• Defrost systems
• Analyzing operating conditions of a refrigeration or A/C system
• Evaporator coil TD requirements for different applications
• Refrigerant charging methods for commercial equipment
• Application of and adjustment of refrigerant pressure controls used in commercial applications
• Methods of determining cut-in and cut-out pressure settings for pressure controls
• Thermostatic expansion valves and TXV capacity charts
• Troubleshooting refrigeration system problems
• Using a temperature/pressure chart for troubleshooting
• Low ambient control methods

 
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