M
Instructor’s Solutions Manual
E
To accompany
D
C
Electricity for HVACR
First
O
N
Edition
N
Joseph
O
Moravek
S I
and
S
Laboratory Manual
E
Nicholas
U
Griewahn
R
Samuel Shane
Todd
, Table of Contents
End of Unit Questions and Answers
Unit 1: Read This Unit First: What I Need to Know to Understand Electricity 1
Unit 2: Ohms Law 3
Unit 3: Safe Use of Electrical Instruments 6
Unit 4: Electrical Fasteners 10
Unit 5: Power Distribution 12
Unit 6: National Electric Code 14
M
Unit 7: Electrical Installation of HVAC 17
Unit 8: Transformers 20
E
Unit 9: Relays, Contactors and Motor Starters 22
Unit 10: Capacitors 24
D
Unit 11: Thermostats 25
Unit 12: Pressure Switches 27
C
Unit 13: Miscellaneous Electrical Components 30
Unit 14: How Do Motors Work? 32
O
Unit 15: Motor Types 34
Unit 16: Green Electronically Commutated Motors (ECM) 37
Unit 17: Understanding Electrical Diagrams 39
Unit 18: Resistors
N 43
Unit 19: Fundamentals of Solid State Circuits 44
N
Unit 20: Circuit Boards 46
Unit 21: Air Conditioning Systems 48
O
Unit 22: Gas Heating Systems 50
Unit 23: Electric Heating Systems 52
I
Unit 24: Heat Pumps 54
S
Unit 25: How to Start Electrical Troubleshooting 57
Unit 26: Basic Electrical Troubleshooting Techniques 59
S
Unit 27: Advanced Electrical Troubleshooting Techniques 62
E
Unit 28: Practical Troubleshooting 67
U
Lab Manual Answers
Lab 2.1: Application of Ohm’s Law in Basic Circuits
R
70
Lab 2.2: Power Calculation and Ohm’s Law Applied to Circuits 71
Lab 3.1: Basic Multimeter and VOM Resistance Measurements 72
Lab 3.2: Taking Voltage and Current Measurements 73
Lab 4.1: Electrical Connections 75
Lab 6.1: National Electric Code® Considerations 76
Lab 7.1: HVACR Electrical Installation and Checklists 77
Lab 7.2: Introduction to Diagrams 78
Lab 8.1: Transformer Identification and Analysis 79
Lab 9.1: Relay, Contactor, and Motor Starter Identification and Specifications 80
Lab 9.3: Relay Logic – Part 2 82
,Lab 9.4: Troubleshooting Control Circuits 84
Lab 10.1: Capacitor Selections and Testing 85
Lab 11.1: Mechanical Thermostat Function and Selection 86
Lab 11.2: Electronic and Programmable Thermostat Selection and Function 87
Lab 12.1: Pressure Switches and Other Safety Switches Used in HVACR 88
Lab 14.1: Introduction to Motor Types 90
Lab 14.2: Motor Control Systems and Diagrams 92
Lab 14.3: Motor Troubleshooting 93
Lab 16.1: The ECM Motor 96
M
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
E
Lab 23.1: Electric Heating Systems Controls and Wiring 102
D
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
C
106
Lab 27.1: Advanced Troubleshooting 108
O
N
N
O
S I
E S
U
R
, 1
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.
M
4. What is voltage? Electrical pressure that pushes current flow.
E
5. What is the difference between a conductor and an insulator? A conductor allows current
D
flow and an insulator restricts current flow.
C
6. What are the two common types of electricity? Direct current (DC) and alternating current
(AC).
O
N
7. What is control voltage? Control voltage is the electrical section of the HVACR system
N
that manages the on and off cycles.
O
8. What is resistance? Resistance is the force that slows down the flow of electrons in a
S I
circuit.
S
9. What is a watt? Watt is the rate of doing work or power.
E
10. How are watts calculated? Watts or power is calculated by multiplying amps by voltage.
U
11. What is a meant by a load? Any component that has a resistance to electron or current flow.
R
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
“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.
Instructor’s Solutions Manual
E
To accompany
D
C
Electricity for HVACR
First
O
N
Edition
N
Joseph
O
Moravek
S I
and
S
Laboratory Manual
E
Nicholas
U
Griewahn
R
Samuel Shane
Todd
, Table of Contents
End of Unit Questions and Answers
Unit 1: Read This Unit First: What I Need to Know to Understand Electricity 1
Unit 2: Ohms Law 3
Unit 3: Safe Use of Electrical Instruments 6
Unit 4: Electrical Fasteners 10
Unit 5: Power Distribution 12
Unit 6: National Electric Code 14
M
Unit 7: Electrical Installation of HVAC 17
Unit 8: Transformers 20
E
Unit 9: Relays, Contactors and Motor Starters 22
Unit 10: Capacitors 24
D
Unit 11: Thermostats 25
Unit 12: Pressure Switches 27
C
Unit 13: Miscellaneous Electrical Components 30
Unit 14: How Do Motors Work? 32
O
Unit 15: Motor Types 34
Unit 16: Green Electronically Commutated Motors (ECM) 37
Unit 17: Understanding Electrical Diagrams 39
Unit 18: Resistors
N 43
Unit 19: Fundamentals of Solid State Circuits 44
N
Unit 20: Circuit Boards 46
Unit 21: Air Conditioning Systems 48
O
Unit 22: Gas Heating Systems 50
Unit 23: Electric Heating Systems 52
I
Unit 24: Heat Pumps 54
S
Unit 25: How to Start Electrical Troubleshooting 57
Unit 26: Basic Electrical Troubleshooting Techniques 59
S
Unit 27: Advanced Electrical Troubleshooting Techniques 62
E
Unit 28: Practical Troubleshooting 67
U
Lab Manual Answers
Lab 2.1: Application of Ohm’s Law in Basic Circuits
R
70
Lab 2.2: Power Calculation and Ohm’s Law Applied to Circuits 71
Lab 3.1: Basic Multimeter and VOM Resistance Measurements 72
Lab 3.2: Taking Voltage and Current Measurements 73
Lab 4.1: Electrical Connections 75
Lab 6.1: National Electric Code® Considerations 76
Lab 7.1: HVACR Electrical Installation and Checklists 77
Lab 7.2: Introduction to Diagrams 78
Lab 8.1: Transformer Identification and Analysis 79
Lab 9.1: Relay, Contactor, and Motor Starter Identification and Specifications 80
Lab 9.3: Relay Logic – Part 2 82
,Lab 9.4: Troubleshooting Control Circuits 84
Lab 10.1: Capacitor Selections and Testing 85
Lab 11.1: Mechanical Thermostat Function and Selection 86
Lab 11.2: Electronic and Programmable Thermostat Selection and Function 87
Lab 12.1: Pressure Switches and Other Safety Switches Used in HVACR 88
Lab 14.1: Introduction to Motor Types 90
Lab 14.2: Motor Control Systems and Diagrams 92
Lab 14.3: Motor Troubleshooting 93
Lab 16.1: The ECM Motor 96
M
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
E
Lab 23.1: Electric Heating Systems Controls and Wiring 102
D
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
C
106
Lab 27.1: Advanced Troubleshooting 108
O
N
N
O
S I
E S
U
R
, 1
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.
M
4. What is voltage? Electrical pressure that pushes current flow.
E
5. What is the difference between a conductor and an insulator? A conductor allows current
D
flow and an insulator restricts current flow.
C
6. What are the two common types of electricity? Direct current (DC) and alternating current
(AC).
O
N
7. What is control voltage? Control voltage is the electrical section of the HVACR system
N
that manages the on and off cycles.
O
8. What is resistance? Resistance is the force that slows down the flow of electrons in a
S I
circuit.
S
9. What is a watt? Watt is the rate of doing work or power.
E
10. How are watts calculated? Watts or power is calculated by multiplying amps by voltage.
U
11. What is a meant by a load? Any component that has a resistance to electron or current flow.
R
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
“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.
