Reading Schematic Diagrams
Electricity for Refrigeration, Heating and Air
Conditioning 7th Edition
Chapter 6 Reading Schematic Diagrams
Reading Schematic Diagrams
Upon completion of this chapter the student will be able to:
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Read and interpret the schematic a dehumidifier
Read and interpret the schematic of a window air conditioner
Read and interpret the schematic of a walk-in-cooler
Read and interpret the schematic of a commercial freezer
Read and interpret the schematic of a gas furnace with a
standing pilot
Read and interpret the schematic of a small packaged
residential air conditioner
Read and interpret the schematics commercial air-conditioning
systems with control relays
Reading Schematic Diagrams
Upon completion of this chapter the student will be able to:
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Read and interpret the schematics commercial air-conditioning
systems with lockout relays
Read and interpret the schematics of two-stage heating and
two-stage cooling systems
Read and interpret the schematics of heat pumps with defrost
boards and defrost timers
Read and interpret the schematic of a commercial refrigeration
system with pump down
Read and interpret most diagrams found in the refrigeration,
heating, and air-conditioning industry
Key Terms
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Balance Point
Combustion Chamber
Control Relay
Defrost Cycle
Dehumidifier
Gas Furnace
Heat Pump
Light Commercial Air-Conditioning Systems
Limit Switch
Line Voltage Control Systems
Lockout Relay
Low-Voltage Control System
Multistage Thermostat
Pump-down Control System
Set Point
Short Cycle
Schematic Diagram Design
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The schematic diagram resembles a ladder in that it is made up of two vertical lines
representing the incoming electrical sources.
The electrical source is electrical energy being supplied to equipment.
The schematic wiring diagram uses symbols to represent electrical components in the
system.
Schematic Diagram Design
Schematic Diagram Design
Schematic Diagram Design
Schematic Diagram Design
Schematic Diagram Design
Schematic Diagram Design
Schematic Diagram Design
Schematic Diagram Design
Schematic Diagram Design