Copyright Goodheart-Willcox Co., Inc. 199
9 Electrical
Wiring
Diagram
Basics
Chapter Outline
9.1 Electrical Devices
9.2 Electrical Symbols and Wiring Diagrams
9.2.1 Pictorial Wiring Diagrams
9.2.2 Schematic Wiring Diagrams
9.2.3 Ladder Diagrams
9.2.4 Sequence of Operations
9.2.5 Converting Schematic Diagrams to Ladder
Diagrams
9.3 Basic Window Air-Conditioning Unit Wiring Diagrams
9.4 Basic Split Air-Conditioning System Wiring Diagrams
9.4.1 Thermostat
9.4.2 Indoor Fan Controls on a Ducted Heating and
Cooling System
9.4.3 Outdoor Controls on a Ducted Heating and Cooling
System
Learning Objectives
After studying this chapter, you will be able to:
■ Describe the types of electrical devices found in a wiring
diagram.
■ Explain the purpose of electrical wiring diagrams.
■ Identify various electrical symbols used in wiring diagrams.
■ Discuss the different types of electrical wiring diagrams
and their advantages and disadvantages.
■ Convert a schematic wiring diagram to a ladder diagram.
■ Determine the sequence of operations of an appliance by
interpreting the appliance’s wiring diagram.
■ Interpret the wiring diagram of a window-type or through-
the-wall air-conditioning unit.
■ Interpret the wiring diagram of a split air-conditioning
system with a low-voltage control circuit.
■ Interpret the wiring diagram of a residential split heating
and cooling system.
9 Electrical
Wiring
Diagram
Basics
Chapter Outline
9.1 Electrical Devices
9.2 Electrical Symbols and Wiring Diagrams
9.2.1 Pictorial Wiring Diagrams
9.2.2 Schematic Wiring Diagrams
9.2.3 Ladder Diagrams
9.2.4 Sequence of Operations
9.2.5 Converting Schematic Diagrams to Ladder
Diagrams
9.3 Basic Window Air-Conditioning Unit Wiring Diagrams
9.4 Basic Split Air-Conditioning System Wiring Diagrams
9.4.1 Thermostat
9.4.2 Indoor Fan Controls on a Ducted Heating and
Cooling System
9.4.3 Outdoor Controls on a Ducted Heating and Cooling
System
Learning Objectives
After studying this chapter, you will be able to:
■ Describe the types of electrical devices found in a wiring
diagram.
■ Explain the purpose of electrical wiring diagrams.
■ Identify various electrical symbols used in wiring diagrams.
■ Discuss the different types of electrical wiring diagrams
and their advantages and disadvantages.
■ Convert a schematic wiring diagram to a ladder diagram.
■ Determine the sequence of operations of an appliance by
interpreting the appliance’s wiring diagram.
■ Interpret the wiring diagram of a window-type or through-
the-wall air-conditioning unit.
■ Interpret the wiring diagram of a split air-conditioning
system with a low-voltage control circuit.
■ Interpret the wiring diagram of a residential split heating
and cooling system.