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HVACR 101 - An Introduction to the Trade

Refrigeration & Air Conditioning Technology
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by Joseph Moravek, John E. Hohman

Theoretical knowledge is presented alongside practical, industry-relevant examples, allowing both entry-level technicians and 2nd year apprentices to easily learn and apply key HVACR concepts.

The second installment in a series of useful and resourceful guides, HVACR 201, continues to build upon the basics of the HVACR trade.

The result of a joint effort by industry leading Air Conditioning Contractors of America (ACCA), PHCC Educational Foundation Plumbing Apprentice & Journeyman Training Committee (PHCC Educational Foundation), and the Refrigeration Service Engineers Society (RSES), the book begins with simpler HVACR concepts and progresses into increasingly complex theories and skills.

Starting with coverage of all of the important components of a system, the book advances to deal with topics in electrical ,heating, motors , and cooling- then moving to troubleshooting and installation procedures.


Year 2, First Semester

Chapter One: Review of Refrigeration Cycle

Basic refrigeration cycle
Saturation, superheat and subcooling
Metering devices

Chapter Two: Compressors

Scroll 2 stage
Hermetic and semi-hermitic
Rotary types, how they work, applications

Chapter Three: Refrigerants and Lubricants

Applications and required lubricants
CFCs, HCFCs, chemical strength
Safety and handling
EPA certification
Recovery and recycle

Chapter Four: Refrigerant Handling Certification

Chapter Five: Condensers

Air cooled
Water cooled

Chapter Six: Metering Devices

Capillary tubes
Fixed orifice/plate
Thermostatic expansion valves (TXV)
Electronic expansion valves (EXV)

Chapter Seven: Accessories

Service valves/access ports
Suction/liquid line heat exchangers
Low ambient controls
Reversing valves (defrost, heat pump)
Relief valves
High/low pressure control
Vibration eliminators
Crankcase heater

Chapter Eight: Evaporators

Types (plate, fin) and applications
Latent and sensible heat removal
Direct expansion and flooded
Pressure drop
Moisture removal
Defrost applications

Chapter Nine: Evacuation and Charging

Leak testing methods
Vacuum pumps

Chapter Ten: Heating

Types of heating appliances
Components, burners and valves
Boilers: water and stream
Sequence of operation
Gas pipe capacity
Ignition devices
Combustion process and testing
Code and safety
Carbon monoxide
Electric and strip
Combustion and secondary air
Gas manifolds
Temperature controls
Safety and Limit controls
Sequence of operation

Chapter Eleven: Electrical

Ohms law review and application
Transformers, voltage, line vs load
Types of wire and wire sizes
Circuits and schematics
Sources: single and 3 phase
Switches and loads
Overload protectors/overcurrent protection (fuses & circuit breakers)
Disconnects and wire sizing

Chapter Twelve: Electrical Troubleshooting

Symptoms, possible causes and application to instrumentation
Circuits, complete, short, open and grounded
Effects of loose wire connections
Wiring diagrams used for troubleshooting
Use of meter/with electrical schematics
Shorts, open, grounds
Loose neutrals

Chapter Thirteen: Introduction to Motors

Types of motors: squirrel cage, induction, single phase, dual phase, three phase and variable speed
Induced current
Motor torque
Starting relays
Starting switch
Starting, relays
Heat and temperature
Identifying motor start and run windings
Mechanical and installation considerations
Lubrication and bearings
Noisy operation
Electrical connections
Operating limitations
Motor overload protections
Nameplate data

Year Two, Second Semester

Chapter Fourteen: Cooling Equipment

Types of units: RTU, split, package, unitary, built-up, matched, ductless, chillers (air and water cooled), cooling tower, chilled water, CW, water treatment intro, pumping
Closed vs open loop
Basic sizing
Sensible vs. latent heat
Velocity over face of coil
Outside air
Duct sizing - supply vs. return
Duct calculator

Chapter Fifteen: Mechanical Troubleshooting

Troubleshooting: refrigeration, A/C, furnace and air flow problems
Case studies of components/systems
Symptoms/problems/causes; refrigeration, cooling, heating, CSI

Chapter Sixteen: Advanced Installation Techniques

Best practices
Piping: Dielectric unions and support
Duct sealing systems
Common code violations and solutions
Vibration and noise issues

Chapter Seventeen: Control Systems

Types of thermostats
Built-in thermostat functions
Heating/cooling controls
Sequence of operation
Troubleshooting components
Pressure switches
Loss of charge

Chapter Eighteen: Psychrometrics

Why learn psychrometrics?
Psychrometric chart terminology
Human comfort zone
Gas laws
Sling psychrometer
What do the lines on the psychrometric chart mean?
Using the psychrometric chart
Finding the properties of air
IAQ: mold and moisture issues
Moisture control: humidification and dehumidification, system, room or whole house moisture control

Chapter Nineteen: Basic Sizing

Heat transfer theory
Steps in sizing equipment
Importance of heating and cooling load calculations
Relationships between load, equipment and duct
Location of ducts/proper installation/sealing
Why match condensers, evaporators and blowers?


About the Author:

Joseph Moravek has a Masters degree in Education. He is a member of the ICBO, ASHRAE and AFE professional organizations.

Currently, Mr. Moravek is a HVAC instructor at Lee College in Baytown, Texas.

464 Pages - 8-1/2 x 11in.
Copyright 20


1418066648 / 9781418066642

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