Terms and Abbreviations


In the field of HVAC there are many abbreviations and symbols.  These are symbolic of not only in the field of study when during your HVAC Training but during the application of knowledge process whether it’s in sales, maintenance or operation.  You should have a somewhat familiarity with these abbreviations and symbols to help you better understand will allow your HVAC Training to be and act as a standalone or as a discipline throughout the entire area of the career field.

Below are a few terms and abbreviations that are used.  Please know that there are more and to be honest this list continues to grow with the ever popular geothermal and going green campaigns.

F= Degrees Fahrenheit

C= Degrees Centigrade

F/A= Degrees Fahrenheit/Absolute

C/A= Degrees Centigrade/Absolute

R°= Degrees Rankin

K°= Degrees Kelvin

P= pounds

psi= pounds per square inch

i= Inches

f= foot or feet

si= square inch

sf= square foot or feet

r= radius of a circle

pcf= pounds per cubic foot

Hg= Inches of mercury

Hp= horsepower

W= watts

Ft.lb.= foot-pounds

Ton= ton of refrigeration effect

lb/cft.= pounds per cubic foot

psig= pounds per square inch gauge

psia= pounds per square inch absolute

When studying HVAC Theories keep the following in mind:

-How does absolute pressure and mercury of vacuum relate in regards to refrigerants?

-The difference between gas and liquids and how they relate to being compressed or liquefied.

-How Btu’s are used in order to properly size a unit of refrigeration systems, HVAC and industrial units.

-Refrigerants and pressures and how the relate

-Absorption of Heat

-What determines the temperature of refrigerant and the pressure at which it will vaporize?

-The different types of heat transfers, convection, conduction and radiation

-Converting temperatures from C to F and vice versa

Terms can sometimes be confusing but very helpful when working or studying within this field.  The great thing is that these terms follow you in different technical areas like electrical, electronics and mechanical engineering and much more.  Your knowledge with these terms will allow you a better understanding and allow you to perform your job in a much quicker and accurate manner that your colleagues will be able to corresponde with ease and a full understandable relationship. 

On occasion I will be updating HVAC Training class with different terms that you will find perhaps useful in not only your educational search but your career search as well.  Careers in HVAC begin with HVAC Training and the HVAC Theories involved throughout the field.  A basic knowledge is required and the terms listed above are a great stepping stone to propel you in that direction.  Whether your the seasoned professional or looking to get into the field of HVAC this page along with our site is dedicated to helping you in providing a great base knowledge.