Instructor’s Solutions Manual
&
Laboratory Manual
Electricity for HVACR, 1st edition
by Joseph Moravek
LU
XE
LI
BR
AR
Y
, TABLE OF CONTENT
Unit 1: Read This Unit First: What I Need to Know to Understand Electricity
Unit 2: Ohms Law
Unit 3: Safe Use of Electrical Instruments
Unit 4: Electrical Fasteners
Unit 5: Power Distribution
Unit 6: National Electric Code
LU
Unit 7: Electrical Installation of HVAC
Unit 8: Transformer
Unit 9: Relays, Contactors and Motor Starters
Unit 10: Capacitors
XE
Unit 11: Thermostats
Unit 12: Pressure Switches
Unit 13: Miscellaneous Electrical Components
LI
Unit 14: How Do Motors Work?
Unit 15: Motor Types
Unit 16: Green Electronically Commutated Motors (ECM)
BR
Unit 17: Understanding Electrical Diagrams
Unit 18: Resistors
Unit 19: Fundamentals of Solid-State Circuits
AR
Unit 20: Circuit Boards
Unit 21: Air Conditioning Systems
Unit 22: Gas Heating Systems
Unit 23: Electric Heating Systems
Y
Unit 24: Heat Pump
Unit 25: How to Start Electrical Troubleshooting
Unit 26: Basic Electrical Troubleshooting Techniques
Unit 27: Advanced Electrical Troubleshooting Techniques
Unit 28: Practical Troubleshooting
,Lab Manual Answers
Lab 2.1: Application of Ohm’s Law in Basic Circuits
Lab 2.2: Power Calculation and Ohm’s Law Applied to Circuits
Lab 3.1: Basic Multimeter and VOM Resistance Measurements
Lab 3.2: Taking Voltage and Current Measurements
Lab 4.1: Electrical Connections
Lab 6.1: National Electric Code® Considerations
Lab 7.1: HVACR Electrical Installation and Checklists
LU
Lab 7.2: Introduction to Diagrams
Lab 8.1: Transformer Identification and Analysis
Lab 9.1: Relay, Contactor, and Motor Starter Identification and Specifications
XE
Lab 9.3: Relay Logic – Part 2
Lab 9.4: Troubleshooting Control Circuits 84
Lab 10.1: Capacitor Selections and Testing 85
Lab 11.1: Mechanical Thermostat Function and Selection 86
LI
Lab 11.2: Electronic and Programmable Thermostat Selection and Function 87
Lab 12.1: Pressure Switches and Other Safety Switches Used in HVACR 88
BR
Lab 14.1: Introduction to Motor Types 90
Lab 14.2: Motor Control Systems and Diagrams 92
Lab 14.3: Motor Troubleshooting 93
AR
Lab 16.1: The ECM Motor 96
Lab 17.1: Common Diagrams and Symbols 98
Lab 19.1: Troubleshooting Printed Circuit Boards 100
Lab 22.1: Gas Heating Systems Controls and Wiring 101
Y
Lab 23.1: Electric Heating Systems Controls and Wiring 102
Lab 24.1: Heat Pump Controls and Wiring 103
Lab 25.1: Using a DMM for Basic Troubleshooting 104
Lab 26.1: Electrical Troubleshooting – The Hopscotch Method 106
Lab 27.1: Advanced Troubleshooting
, kjhgfds
Unit 1
REVIEW QUESTIONS
1. What is electricity? Electricity is the flow of electrons between atoms.
2. What is current flow or amperage? Flow of electrons.
3. What creates a magnetic field in a conductor? Voltage or current flow? Current flow.
LU
4. What is voltage? Electrical pressure that pushes current flow.
5. What is the difference between a conductor and an insulator? A conductor allows current
flow and an insulator restricts current flow.
XE
6. What are the two common types of electricity? Direct current (DC) and alternating current
(AC).
7. What is control voltage? Control voltage is the electrical section of the HVACR system
LI
that manages the on and off cycles.
8. What is resistance? Resistance is the force that slows down the flow of electrons in a
BR
circuit.
9. What is a watt? Watt is the rate of doing work or power.
10. How are watts calculated? Watts or power is calculated by multiplying amps by voltage.
AR
11. What is a meant by a load? Any component that has a resistance to electron or current flow.
12. What is the difference between a complete circuit, open circuit and a short circuit?
A complete circuit is a path for electricity to flow. An open circuit means that there is break or
Y
“opening” in the wire or load stopping the flow of electrons. A short circuit has the power
going to ground or a condition in which the load has very low resistance.
13. What is a series circuit? A series circuit is a circuit that has only one path for current flow.
&
Laboratory Manual
Electricity for HVACR, 1st edition
by Joseph Moravek
LU
XE
LI
BR
AR
Y
, TABLE OF CONTENT
Unit 1: Read This Unit First: What I Need to Know to Understand Electricity
Unit 2: Ohms Law
Unit 3: Safe Use of Electrical Instruments
Unit 4: Electrical Fasteners
Unit 5: Power Distribution
Unit 6: National Electric Code
LU
Unit 7: Electrical Installation of HVAC
Unit 8: Transformer
Unit 9: Relays, Contactors and Motor Starters
Unit 10: Capacitors
XE
Unit 11: Thermostats
Unit 12: Pressure Switches
Unit 13: Miscellaneous Electrical Components
LI
Unit 14: How Do Motors Work?
Unit 15: Motor Types
Unit 16: Green Electronically Commutated Motors (ECM)
BR
Unit 17: Understanding Electrical Diagrams
Unit 18: Resistors
Unit 19: Fundamentals of Solid-State Circuits
AR
Unit 20: Circuit Boards
Unit 21: Air Conditioning Systems
Unit 22: Gas Heating Systems
Unit 23: Electric Heating Systems
Y
Unit 24: Heat Pump
Unit 25: How to Start Electrical Troubleshooting
Unit 26: Basic Electrical Troubleshooting Techniques
Unit 27: Advanced Electrical Troubleshooting Techniques
Unit 28: Practical Troubleshooting
,Lab Manual Answers
Lab 2.1: Application of Ohm’s Law in Basic Circuits
Lab 2.2: Power Calculation and Ohm’s Law Applied to Circuits
Lab 3.1: Basic Multimeter and VOM Resistance Measurements
Lab 3.2: Taking Voltage and Current Measurements
Lab 4.1: Electrical Connections
Lab 6.1: National Electric Code® Considerations
Lab 7.1: HVACR Electrical Installation and Checklists
LU
Lab 7.2: Introduction to Diagrams
Lab 8.1: Transformer Identification and Analysis
Lab 9.1: Relay, Contactor, and Motor Starter Identification and Specifications
XE
Lab 9.3: Relay Logic – Part 2
Lab 9.4: Troubleshooting Control Circuits 84
Lab 10.1: Capacitor Selections and Testing 85
Lab 11.1: Mechanical Thermostat Function and Selection 86
LI
Lab 11.2: Electronic and Programmable Thermostat Selection and Function 87
Lab 12.1: Pressure Switches and Other Safety Switches Used in HVACR 88
BR
Lab 14.1: Introduction to Motor Types 90
Lab 14.2: Motor Control Systems and Diagrams 92
Lab 14.3: Motor Troubleshooting 93
AR
Lab 16.1: The ECM Motor 96
Lab 17.1: Common Diagrams and Symbols 98
Lab 19.1: Troubleshooting Printed Circuit Boards 100
Lab 22.1: Gas Heating Systems Controls and Wiring 101
Y
Lab 23.1: Electric Heating Systems Controls and Wiring 102
Lab 24.1: Heat Pump Controls and Wiring 103
Lab 25.1: Using a DMM for Basic Troubleshooting 104
Lab 26.1: Electrical Troubleshooting – The Hopscotch Method 106
Lab 27.1: Advanced Troubleshooting
, kjhgfds
Unit 1
REVIEW QUESTIONS
1. What is electricity? Electricity is the flow of electrons between atoms.
2. What is current flow or amperage? Flow of electrons.
3. What creates a magnetic field in a conductor? Voltage or current flow? Current flow.
LU
4. What is voltage? Electrical pressure that pushes current flow.
5. What is the difference between a conductor and an insulator? A conductor allows current
flow and an insulator restricts current flow.
XE
6. What are the two common types of electricity? Direct current (DC) and alternating current
(AC).
7. What is control voltage? Control voltage is the electrical section of the HVACR system
LI
that manages the on and off cycles.
8. What is resistance? Resistance is the force that slows down the flow of electrons in a
BR
circuit.
9. What is a watt? Watt is the rate of doing work or power.
10. How are watts calculated? Watts or power is calculated by multiplying amps by voltage.
AR
11. What is a meant by a load? Any component that has a resistance to electron or current flow.
12. What is the difference between a complete circuit, open circuit and a short circuit?
A complete circuit is a path for electricity to flow. An open circuit means that there is break or
Y
“opening” in the wire or load stopping the flow of electrons. A short circuit has the power
going to ground or a condition in which the load has very low resistance.
13. What is a series circuit? A series circuit is a circuit that has only one path for current flow.
