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CONTENTS:

Preface………………………………i
List of Illustrations……………….....v

SECTION ONE: FUNDAMENTAL ELECTRICAL
CONCEPTS

Unit 1 Generating Electricity and Electron
Flow……………………..…………...3
Producing Electricity… Electricity & Magnetism…
Atomic Theory… Conductors vs. Insulators…
Semi-Conductors… Student Review Workbook Pages…

Unit 2 Alternating Current, Direct Current &
Electrical Power …………………….21
Comparing Direct Current & Alternating Current…
Ohm’s Law… Voltage As Pressure In A Circuit…
Current/Amperes In A Circuit…. Resistance In Electrical
Circuits and Components… Electrical Power/Watts…
Student Review Workbook Pages…

Unit 3 Electrical Distribution Systems:
Single Phase and Three Phase
Power………………………………...37
Step Up and Step Down Transformers In Electrical
Distribution Systems… Voltage and Phase Systems…
Single Phase Power Supply In Residential Applications…
No-Load/Load Testing A 120-Volt Power Supply…
Voltage Drop In An Electrical Circuit… Testing For Proper
Polarity & Ground In A 120-Volt Circuit… Testing For Voltage
Drop In A 240-Volt Circuit… Three Phase Power Supply
Systems In Commercial Applications… Delta and Wye
Transformer Systems… Phase Imbalance In Three Phase Power
Supply Systems… Student Review Workbook Pages…

Unit 4 Electrical Supply Circuit Protection:
Fuses and Circuit Breakers…………...67
Fuse Protection In A Power Supply Circuit… Types of Fuses…
Checking For Power In a Pull-out Fuse Disconnect Box…
Checking For Power In A Pull-out Switch Disconnect Box…
The Danger of Incorrect Fusing… Non-Fused Disconnects…
Circuit Breakers… Student Review Workbook Pages…

Unit 5 Proper Use of Test Instruments..…..…93
Fundamentals of Analog & Digital Meters… Continuity and
Resistance… Potential Voltage vs. Applied Voltage…
Measuring Voltage With a Digital Meter… Measuring Current
With a Digital Meter… Specific Component Test Settings of
Digital Meters… Checking Temperature With a Digital Meter…
Care and Maintenance of Digital Meters… Student Review
Workbook Pages…

SECTION TWO: WIRING DIAGRAMS & HVACR
ELECTRICAL SYSTEM COMPONENTS
Unit 6 Wiring Diagram Structure & Symbols....129
Wiring Diagram Structure… Transformer Symbols…
Adding Symbols To The Dual Voltage Schematic…
Switches and Loads… Reading and Interpreting Schematic
Diagrams… Ten Steps To Troubleshooting Success…
Pictorial Wiring Diagrams… Student Review Workbook
Pages…

Unit 7 HVACR Motors .…………..……...……181
Motor Windings… Permanent Split Capacitors and PSC
Motors… Start Capacitors In Motor Circuits… Potential
Relays and Start Capacitors… Potential Relays and the Concept
of Back EMF… Testing Single Phase Motor Windings…
Current and PTC Relays In Refrigeration System Compressors…
Indoor Air Handler Motors In HVACR Equipment… Three
Phase AC Motors… Variable Speed Motors… Student Review
Workbook Pages…

Unit 8 Wiring Diagram Review: Gas & Electric
Heating Systems…………………..……255
Devices and Sequence of Operation… Schematic Symbols…
Isolating Schematic Circuits… Fan Switches… Time Delay
Relays… Limit Switches… Sequencers In Electric Furnaces…
Voltmeter and Ammeter Tests… Pictorial Diagrams… Wiring
Diagram Legends… Printed Circuit Board Controls…
Hot Surface Ignition Systems… Spark Ignition Systems….
Student Review Workbook Pages…

Unit 9 Wiring Diagram Review: Comfort
Cooling Systems………………………..293
Dual Voltage Schematic Diagrams In Comfort Cooling
Equipment…. Cooling Thermostats…. Crankcase Heaters….
Pressure Switches….. Control Relays…. Transformer VA
Capacity…. Potential Relays and Capacitors…. Hot Gas
Defrost Systems In Refrigeration Equipment…. Electric Defrost
Systems…. Student Review Workbook Pages…

Unit 10 Wiring Diagram Review:
Heat Pumps……………………………..317
Dual Voltage Schematic Diagrams In Heat Pumps….
Heat Pump Circuit In Cooling Mode…. Heat Pump Circuit In
Heating Mode…. Heat Pump Circuit In Heating Mode….
Heat Pump Circuit In Defrost Mode…. Supplemental Heat
Strips In Heat Pumps…. Thermistors In Heat Pumps….
Heat Pump Defrost Control Boards…. Student Review
Workbook Pages…

Appendix A Troubleshooting Problems……...…341
A Heat Pump That’s Not Keeping A Building Comfortable…
A Comfort Cooling System That’s Not Performing Like It
Should…. A No Heat Complaint…. An Electric Furnace
That’s Not Keeping A House Warm Enough…. A Two-Stage
Air Conditioner That’s Not Working…. A Small Commercial
Unitary System That’s Not Heating…. A Split System That’s
Blowing Fuses…. A Condensing Gas Furnace That’s Not
Heating…. A Package Unit That’s Not Cooling…. The
Excessively Expensive Heat Pump…. An Electric Furnace
That’s Not Heating Enough…. A System That’s Blowing
Warm Air…. A No Cooling Complaint…. An Ice Machine
That’s Not Dispensing Cubes Properly…. A Comfort Cooling
System That’s Not Keeping Up With The Load…. Student
Workbook Pages….