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Electrical Theory & Applications for HVACR
©2012 ESCO Group
Table of Contents
Safety and Hazard Awareness
i‐iii
Electrical Shock
Lockout‐Tagout Procedures
Do not Work Alone
Learn First Aid
Electrical Burns
Portable Electric Tools
Non‐ConducƟng Ladders
Safety Guidelines
Chapter 1: What Is Electricity?
1
Electrons
Ohm’s Law
PotenƟal Difference
InducƟve Reactance
Volts
CapaciƟve Reactance
Measuring volts
Impedance
How Electrons Move
Measuring Resistance
Amperage
WaƩage
Resistance
Chapter 2: Circuits and Their Components
17
Series Circuit
Circuit ProtecƟon
Total Resistance in a Series Circuit
Loads and Switches
Series Circuit Laws
Transformers
Parallel Circuits
Low‐Voltage Transformers
Total Resistance in a Parallel Circuit
Solenoid valves
Parallel Circuit Laws
Relays
CombinaƟon Series /Parallel Circuits
Sequencer
Three‐Phase Circuits
Contactors
Single‐Phase Circuits
Contactor Coil Burn‐Out
The Neutral Wire
Line Starters
The Safety Ground Wire
Defrost Timers
Conductors
Thermostats
Insulators
Heat AnƟcipators
Semi‐Conductors