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R-410a Usage Certification

I.     Course Prefix/Number: AHR 106

       Course Name: R-410a Usage Certification

       Credits: 1 (1 lecture; 0 lab)

II.    Prerequisite

AHR 101 or consent of instructor.

III.   Course (Catalog) Description

HCFC-22 is one of the most commonly used chemicals in air conditioning equipment.  All HVACR technicians will need to be certified in safely using R410a refrigerant, which is the replacement for HCFC-22, commonly known as R-22.  This course will teach students how to work with R-410a in a safe manner. The course is designed to prepare students to take a R-410a safe use certification test.

IV.   Learning Objectives

To prepare students for taking the R-410a Certification Exam and to work safely with R-410a refrigerant.

V.    Academic Integrity

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.
Details of the Code of Academic Conduct can be found in the Student Handbook.

VI.   Sequence of Topics

I.    R-410A and the R-22 Phase-Out
    1.    Background
    2.    HCFC Phase-out Schedule
    3.    Regulation and Change
    4.    The Future
    5.    Safety and R-410A

II.    Refrigeration and Air Conditioning Systems Fundamentals
    1.    Objectives
    2.    Vapor Compression Refrigeration System
    3.    Condensing Pressure
    4.    Evaporating  Pressure
    5.    Refrigerant States and Conditions
    6.    Saturation
    7.    Vapor Pressure
    8.    Superheat
    9.    Subcooling
    10.    Basic Refrigeration System Components

III.    Refrigerant Chemistry and Applications
    1.    Objectives
    2.    CFCs, HCFCs, and HFCs
        a)    Chloroflurorocarbons (CFCs)
        b)    Hydrochlorofluorocarbons (HCFCs)
        c)    Hydrofluorocarbons (HFCs)
    3.    Blends
    4.    Blend Fractionation
    5.    Blend Temperature Glide
    6.    Superheat & Subcooling Calculation Methods for Near-Azeotropic Blends
    7.    Subcooling & Superheat with Temperature Glide
    8.    Evaporator Superheat Calculation
    9.    Condenser Subcooling Calculations
    10.    Blend Lubricants
    11.    HCFC-22 Replacement Candidates: R-410A & R-407C
    12.    Basic Service Tools
        a)    Gauge Manifold
            • R-410A Considerations
        b)    Micron Gauge
        c)    Vacuum Pumps
            • R-410A Considerations
        d)    Leak Detectors
            • R-410A Considerations
    13.    Refrigerant Recovery Systems
        a)    Passive Recovery (System-Dependent)
        b)    Active Recovery (Self –Contained)
    14.    Refrigerant Charging
        a)    Undercharge
        b)    Overcharge
    15.    R-410A System Charging
        a)    Charging for Proper Subcooling R-410A
        b)    Charging for Proper Superheat R-410A
    16.    R-407C System Charging
    17.    R-407C Refrigerant Leaks & Leak Detectors
IV.    Refrigeration Oils and Their Applications
    1.    Objectives
    2.    Oil Groups
    3.    Synthetic Oils
    4.    Alkylbenzene
    5.    Glycols
    6.    Esters
    7.    Waste Oils
    8.    Lubricants for HFC R-410A, R-407C, & R-134a
    9.    Advantages of POE lubricants over mineral oils
    10.    Special Concerns with Polyolester (POE) Lubricants
V.    Safety
    1.    Objectives
    2.    Personal Safety Protection
    3.    Electrical Safety
    4.    Safe Refrigerant Handling
    5.    Storage Cylinders
    6.    Shipping
    7.    ASHRAE Standard 34
    8.    Equipment Room / Job Site Safety
        a)    Monitors
        b)    Alarms
    9.    Ventilation
    10.    Purge Venting
        a)    Breathing Apparatus
    11.    Safety Overview
    12.    R-410a Considerations
    13.    Material Safety Data Sheet
        MSDS Overview
        a)    Toxicity
        b)    Flammability
        c)    Combustibility
        d)    Ingestion
        e)    Skin or Eye Contact
        f)    Inhalation
        g)    Refrigerant Decomposition
14.    Environmental Considerations

VII.  Methods of Instruction

Classroom instruction and laboratory exercises as appropriate.
Course may be taught as face-to-face, media-based, 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.
F.    Safety goggles must be worn at all times in the lab during lab.
G.    All tools, instruments and equipment must be returned to their appropriate place
        and clean-up work area.

IX.   Instructional Materials

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

Texts to be chosen by instructor.

X.    Methods of Evaluating Student Progress

The certification test will be administered by Oakton’s Testing Center and will be graded by an outside third party testing agency. Depending on the score on the exam, course grades will be given by the instructor.

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.