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Refrigerant Piping & Practices

HVAC 126

Refrigerant Piping & Practices

HVAC 126

Course Description

Provides instruction in proper methods of brazing joint design using oxyacetylene torches. Develops skills to correctly size, lay out, and install tubing and piping in refrigeration and heating systems. Covers flow capacities of tubing and piping. Examines techniques to cut pipe threads, use pipe fittings, form swag and flare joints, work with plastic vent pipe and plastic drainpipe, work with high temperature solders and fluxes and learn about fastening devices. Credits may be earned in either HVAC 126 or RHA 126 but not in both. (35-10)

Outcomes and Objectives

Demonstrate knowledge of types and sizes of tubing.

Objectives:

  • Identify the difference between soft- and hard-drawn copper.
  • Identify how ACR tubing is different from other tubing.
  • Identify how ACR tubing is sized.
  • Demonstrate correct measurement of ACR tubing lengths and diameters.
  • Identify four weights of copper tubing. (Type L, type K. type M, and type DWV).
  • Identify which weights are generally used for ACR copper.
  • Identify types of fittings used in ACR systems.
  • Identify types of tubing used for plumbing and heating.
  • Identify the term nominal size.
  • Identify how plumbing and heating copper is sized.
  • Define the terms work hardening and annealing.
  • Identify the types of line sets that can be used for Air Conditioning.
  • Identify the types of tubing insulation used on Refrigeration and Air Conditioning systems.
  • Identify tools used to cut copper tubing.
  • Demonstrate proper procedures for cutting copper tubing.
  • Demonstrate procedures for deburring the copper tubing.

Demonstrate knowledge of tools and methods to bend tubing and to make tubing fittings and joints.

Objectives:

  • Identify the tools used to bend copper tubing.
  • Demonstrate proper procedures for bending copper tubing.
  • Demonstrate knowledge of copper fitting types and their uses.
  • Demonstrate swaging techniques used to make tubing solder joints.
  • Identify the tools used to make swag joints and flare joints.
  • Demonstrate methods of making flare joints.
  • Design 10 swag joints.
  • Design 5 flare joints.

Demonstrate knowledge of proper use of oxyacetylene brazing and soldering.

Objectives:

  • Identify the components of an oxyacetylene torch.
  • Demonstrate safe methods of installing regulators, hoses, and torch handle.
  • Demonstrate safe methods of adjusting torch regulators and lighting the torch.
  • Identify three types of torch flames.
  • Adjust the torch flame to a near neutral flame or slightly carbonizing flame.
  • Demonstrate methods of cleaning the tubing before brazing.
  • Demonstrate knowledge of proper fluxes for given solder types.
  • Demonstrate proper fluxing techniques.
  • Demonstrate knowledge of different solders for different materials.
  • Identify soldering and brazing alloys used in HVACR.
  • Demonstrate use of different solders for different metal types.
  • Demonstrate proper soldering techniques.
  • Demonstrate methods of using heat sinks.
  • Describe heat exchange techniques.
  • Identify torch tip sizes.
  • Demonstrate procedures for cleaning torch tips.

Demonstrate knowledge of gas piping flow rates, sizing of piping, and fittings used in fuel line and appliance piping.

Objectives:

  • Identify types of piping used in gas fuel lines and to connect appliances.
  • Identify types of piping used for natural gas and for propane gas.
  • Define nominal size in reference to gas piping.
  • Identify the difference between wrought iron pipe and steel pipe.
  • Identify the differences in standard, extra strong, and double strength pipe.
  • Identify the two types of American Standard Pipe Thread (tapered or straight thread).
  • Demonstrate knowledge of pipe thread shapes, diameters, number of threads per inch and pipe thread taper.
  • Identify a written pipe thread dimension (1/2-14 NPT).
  • Identify the tools used to cut and thread iron pipe.
  • Demonstrate proper methods of pipe threading.
  • Demonstrate proper cleaning and alignment of thread dies in the die head.
  • Identify steel pipe fittings.
  • Demonstrate knowledge of fuel line installation.
  • Demonstrate knowledge of proper piping of gas furnaces.
  • Properly thread black pipe.
  • Identify gas codes controlling gas pipe installation.

Demonstrate knowledge of plastic pipe installation as used in water, drains, waste, and venting.

Objectives:

  • Identify the uses for these types of plastic pipe.
  • Identify fittings for plastic fittings.
  • Identify methods for cutting plastic pipe.
  • Identify cleaners, primers, and glues used for plastic pipe.
  • Identify procedures for assembling plastic pipe.
  • Design a condensate drain system.
  • Design an evaporator drain system.
  • Design a plastic vent system.
  • Design a plastic water system.