Academic Catalog

APSM 152B: CHARGING REFRIGERANT SYSTEMS

Foothill College Course Outline of Record

Foothill College Course Outline of Record
Heading Value
Units: 2
Hours: 20 lecture, 20 laboratory per quarter (40 total per quarter)
Prerequisite: Per California Code of Regulations, this course is limited to students admitted to the Sheet Metal Apprenticeship Program.
Degree & Credit Status: Degree-Applicable Credit Course
Foothill GE: Non-GE
Transferable: None
Grade Type: Letter Grade Only
Repeatability: Not Repeatable

Student Learning Outcomes

  • A successful student will be able to use pressure and temperature measuring instruments to evaluate refrigerant condition in a typical hvac system.
  • A successful student will be able to use charging equipment to achieve the desired refrigerant charge for a common air conditioning system.

Description

Students learn the fundamentals of charging refrigerant systems.

Course Objectives

The student will be able to:
A. Determine the proper charging method for a specific system
B. Use temperature measuring instruments
C. Use pressure test instruments
D. Use refrigerant leak detection devices
E. Use charging equipment to achieve the proper charge for the system
F. Determine factors that may adversely affect the correct charge of the system (existing duct design, piping size, ambient temperature, component location)
G. Demonstrate other refrigerant charging techniques

Course Content

A. Determine the proper charging method for a specific system
1. Describe how refrigerant is charged into systems in the vapor and liquid states (Lec and Lab)
2. Describe how refrigerant is charged into systems in the vapor and liquid states (Lec and Lab)
3. Describe two types of charging devices (Lec and Lab)
B. Use temperature measuring instruments
1. Demonstrate the use of type K and bead probe measuring instruments (Lec and Lab)
C. Use pressure test instruments
1. Demonstrate use of manifold gauge pressure sets (Lec and Lab)
D. Use refrigerant leak detection devices
1. Describe various types of leak detectors and demonstrate their use (Lec and Lab)
E. Use charging equipment to achieve the proper charge for the system
1. State the advantage of using electronic weighing scales (Lec and Lab)
F. Determine factors that may adversely affect the correct charge of the system (existing duct design, piping size, ambient temperature, component location) (Lec and Lab)
G. Demonstrate other refrigerant charging techniques
1. Describe system charging using two different weighing methods (Lec and Lab)
2. Use the sub-cooling method of charging units with a TXV (Lec and Lab)
3. Charge fixed orifice, capillary tube and piston tube systems using charging charts and curves (Lec and Lab)
4. Charge refrigerant blends incorporating a temperature glide and fractionation potential (Lec and Lab)

Lab Content

A. Demonstrate proper use of refrigerant pressure test instruments.
B. Demonstrate proper use of refrigerant leak detection devices.
C. Demonstrate use of refrigerant charging equipment to achieve proper charge for system.

Special Facilities and/or Equipment

A. Laboratory with sheet metal service tools
B. Personal protective equipment

Method(s) of Evaluation

A. Results of written quizzes and tests
B. Responses in class discussions
C. Comprehensive written final examination
D. Comprehensive final project
E. Demonstration of assigned skills to acceptable level per instructor

Method(s) of Instruction

A. Lecture
B. Discussion
C. Demonstration
D. Lab assignments followed by discussion

Representative Text(s) and Other Materials

Whitman, B., B. Johnson, J. Tomczyk, and E. Silberstein. Refrigeration and Air Conditioning Technology. 8th ed. Boston, MA: Cengage Learning, 2016.

 

Types and/or Examples of Required Reading, Writing, and Outside of Class Assignments

A. Sample reading assignment: From the textbook, Unit 10, “System Charging”

B. Sample writing assignment: Answer review questions related to the assigned reading

 

Discipline(s)

Sheet Metal, Air Conditioning, Refrigeration, Heating