Reading Schematics & Symbols

Table of Contents

Chapter 1: Introduction to Technical Diagrams

Topics: Using schematics; Electrical, pneumatic, hydraulic, and piping schematics; Looking for flow; Electrical current; Fluid flow

Learning Objectives:

• State the definition of a schematic.
• List some characteristics of schematics.
• Identify a schematic among other kinds of technical drawings and diagrams.
• Explain how flow is indicated on a schematic.

Chapter 2: Symbols on Schematics

Topics: Common features in schematics; Creating and using the schematic; Identifying symbols and connections; Reading diagrams

Learning Objectives:

• Identify various types of lines on schematics
• Identify the following schematics by their symbols:Electrical
  Fluid-power
  Piping
• Give the purpose of legends and other tables of symbols.
• Describe a set-by-step approach to troubleshooting when using a schematic.

Chapter 3: Electrical Symbols

Topics: Wires and connections; Switches; Power supply; Electrical loads; Coils and transformers; Fuses and circuit breakers; Grounding; Contacts; Resistors; Symbols in a diagram

Learning Objectives:

• State the meaning of symbols and lines on an electrical schematic.
• Explain the difference between a fuse and a circuit breaker.
• Explain how to trace an electrical circuit.

Chapter 4: Electrical Diagrams

Topics: Schematic and wiring diagrams; Series and parallel circuits; Reading electrical diagrams and industrial schematics

Learning Objectives:

• Explain the difference in current flow between a series circuit and a parallel circuit.
• Explain the purpose of a wiring diagram.
• Demonstrate how to read an electrical schematic.
• Identify the objects represented by the symbols on an industrial schematic.

Chapter 5: Piping Symbols

Topics: Piping systems; Kinds of diagrams; Projections; Joints; Fittings; Symbols

Learning Objectives:

• Explain the function of a valve in a piping system.
• Name the ways of joining pipe.
• Identify the symbols for various kinds of fittings and describe the function of each fitting.

Chapter 6: Piping Diagrams

Topics: Piping systems; Valves; Identifying symbols; Reading a piping schematic

Learning Objectives:

• Give the purpose of a valve in a piping system.
• Explain the difference between a check valve and a cock valve.
• Identify the symbols for various types of valves.
• Demonstrate the ability to determine pipe size from a diagram.

Chapter 7: Hydraulic and Pneumatic Symbols

Topics: Fluid power; Reservoirs and receivers; Pumps and compressors; Actuators; Valves; Piping and tubing

Learning Objectives:

• Describe a fluid-power system.
• List and give the purpose of the main parts of a hydraulic system.
• List and give the purpose of the main parts of a pneumatic system.
• Identify pneumatic and hydraulic symbols on schematics.

Chapter 8: Hydraulic and Pneumatic Diagrams

Topics: Composite symbols; Understanding circuits; Hydraulic and pneumatic circuit diagrams; Local areas

Learning Objectives:

• Describe a composite symbol.
• Explain the difference between a closed and an open hydraulic or pneumatic system.
• Identify the actuator in a hydraulic diagram.
• Explain the purpose of local areas on a hydraulic or pneumatic diagram.

Chapter 9: Air Conditioning and Refrigeration Diagrams

Topics: Refrigeration, water, air distribution, and control subsystems; Electric, electronic, and pneumatic control schematics

Learning Objectives:

• Describe the subsystems of an air conditioning system.
• Identify the symbols for air conditioning and refrigeration components.
• Explain the operation of an air conditioning and refrigeration control system.

Chapter 10: Welding and Joining Symbols

Topics: Methods of welding; Joints; Welds; Symbols for welds; Assembled welding symbol; Placement of welds

Learning Objectives:

• Explain fusion welding.
• Name the main methods of fusion welding.
• Name the five types of joints and three ways of welding each joint.
• Demonstrate how to read and interpret a complete welding symbol.

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