Electricity for HVACR - By Joe Moravek
A book written to help a person with no electrical
experience or training to understand the operation of
HVACR electrical circuits.
 This
material does not get into the theory of electrical
circuits; instead, it provides the fundamental
information needed to understand and repair an HVACR
system. Therein lies the real goal of this book: to
teach the reader how to correctly diagnosis and solve
electrical problems. As an aspiring HVACR technician,
you will never know it all. There is always something
new and interesting to learn. If you are lifetime
learner, you will like our profession.
How the Text Is Organized
Electricity for HVACR is divided into 28 progressive
units. It is designed with the spiral learning concept,
with each new unit building on content learned from the
previous unit. The first units begin with fundamentals
such as defining terms used in our industry. A unit on
the safe use of instruments addresses how to use
diagnostic tools and instruments safely. This includes
information on purchasing a quality and safe
voltage-measuring product. The first half of the book
includes many units that discuss the common components
found in HVACR systems. These units describe the
operation of the electrical components and how to
troubleshoot them.
Next, the middle content discusses the symbols and
components that make up an electrical diagram. The
reader is slowly taken through the process of
understanding electrical diagrams. Many examples are
used to explain the operating sequence of diagrams.
Unit 16 covers the “green” electronically commutated
motor (ECM). This motor represents a great advance in
technology. Because this new, advanced technology is not
well understood, the goal of the unit is help the
learner understand the operation and troubleshooting of
ECMs.
Units 21 through 24 describe the sequence of operation
for air conditioning, gas heat, electric heat, and heat
pump systems, respectively. These units apply what was
learned in the preceding 20 units.
The final four units describe the all-important
troubleshooting process. Unit 25 discusses how to get
started. It offers some basic techniques to help the
reader apply troubleshooting skills at the beginning of
the search for the problem. Ultimately, this is the goal
of this book: learning how to troubleshoot and repair.
If a student-tech cannot find and repair an HVACR
problem, then this book will help him or her “figure it
out.”
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