Maricopa Community Colleges  HVA101LL   19916-19985 
Official Course Description: MCCCD Approval: 04/23/91
HVA101LL 19916-19985 LAB 1 Credit(s) 3 Period(s)
Principles of Refrigeration Lab
Servicing refrigeration units. Includes soldering tubing, installing/removing manifold gauge set, evacuating and charging the system. Emphasis on safety. Prerequisites: None. Corequisites: HVA101 or permission of department.
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MCCCD Official Course Competencies:
 
HVA101LL   19916-19985 Principles of Refrigeration Lab
1. Given the specifications, construct a leak-free tubing project demonstrating flaring, swaging, soldering/silver brazing, and required torch safety procedures. (I)
2. Explain and demonstrate procedures for installing and removing the manifold gauge set. (II)
3. Demonstrate and explain procedures for evacuating refrigerant systems, observing safety procedures. (III)
4. Select the proper refrigerant for specific refrigerant systems and demonstrate procedures for charging a system, utilizing appropriate safety procedures. (IV)
5. Select appropriate method(s) and demonstrate the procedure for leak testing, utilizing appropriate safety procedures. (V)
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MCCCD Official Course Outline:
 
HVA101LL   19916-19985 Principles of Refrigeration Lab
    I. Copper Tubing
        A. Cutting
        B. Flaring
          1. deburring
          2. filing square
          3. checking fit
        C. Swaging
          1. selecting tools
          2. evaluating cup
            a. depth
            b. pipe clearance
        D. Soft soldering
          1. cleaning surface
            a. pipe
            b. cup of fitting
          2. flux
            a. flux for filler rod
            b. female end 1/8" from end
          3. soldering procedure
            a. torch selection
            b. heating of pipe/fitting
            c. applying filler rod
        E. Hard soldering
          1. cleaning pipe/fitting
          2. rod selection
            a. phoscopper
            b. silphos
            c. silver solder
          3. flux pipe
          4. torch selection
          5. heating pipe/fitting
        F. Bending tubing
          1. tube bender selection
          2. measuring for bend
          3. manufacturer's guidelines
        G. Following/producing
          1. specification sheet
          2. copper tubing test
        H. Torch safety
      II. Manifold Gauge Set
          A. Service valve positions
            1. back seat
            2. cracked
            3. front seated
          B. Manifold gauge set
            1. compound gauge low side
            2. pressure gauge high side
            3. hand wheels
              a. open
              b. closed
            4. hoses
              a. low side
              b. charging/purging
              c. high side
          C. Installing gauge set-service valve
            1. back seat service valve
            2. hand wheels
            3. gauge port cup
            4. hose via refrigerant cylinder
            5. hose-gauge port
            6. service valve
            7. pressure
          D. Removing hose
            1. back seat high side service valve
            2. center hose of gauge set
            3. hand wheels
            4. pressure equalization
            5. back seat service valve
            6. hoses
            7. gauge port cup
            8. service valve stem cup
          E. Safety
            1. eye protection
            2. hand protection
            3. refrigerant cylinder
              a. full level
              b. transporting
              c. heating cylinder
          F. Schrader valve
            1. hose to valve
            2. quick connect
        III. Evacuation Process
            A. Gauges
            B. Vacuum pump
            C. Types of procedures
              1. tripple
              2. deep using a micron guage
            D. Safety
            E. Remove gauges
          IV. System Charging
              A. Methods
                1. pressure/temperature/superheat
                2. manufacturers' charts
                3. sight glass
                4. measuring
              B. Install gauges
              C. Charge system
              D. Remove gauges
              E. Safety
                1. eye protection
                2. hand protection
            V. Leak Testing
                A. Methods
                  1. visual
                  2. halide - time
                  3. electronic
                  4. liquid soap - speed
                B. Safety
                  1. halide - toxic gas
                  2. electric/electronic - shock hazard
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