Gargaro's World: HVACR Theory in a Nutshell

August 7, 2008
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This was sent to me by Thomas Ask, P.E., associate professor at Pennsylvania College of Technology and I thought I would pass it on to my three readers:

It is difficult to drive theoretical concepts into the minds of students who like to work with their hands. What I ask all students to know when they complete my courses is a list of eight critical truths related to HVACR. This list is asked for both on the midterm and final exams. This is an imperfect list; however, it endeavors to lock in critical knowledge that the HVAC professional must always consider in his or her work.

HVAC professionals must always know the following:

• HVAC equipment is Heavy, check load bearing ability of structures and floors.

• Poor combustion results in undetectable CO, which can kill people.

• Fuel can Explode at certain fuel to air ratios, which can kill people.

• Things eXpand when heated and contract when cooled, which can tear apart systems.

• High surge Pressure is produced by the closure of fast acting valves, which can tear apart systems.

Smoke travels through ducts, which can kill people.

Water expands as it freezes, which can tear apart systems.

Refrigerants can suffocate people.

I have developed the following mnemonic that is helpful in memorizing these key concepts: Heating and Cooling EXPerts Set World Right. Most professionals would add many more items to this list but I believe these eight facts encompass important safety and catastrophic destruction concerns in mechanical systems.

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HVAC Theory In a Nutshell

Bryan McGrath
August 7, 2008
I enjoy mnemonics to help remember things...some are incredibly clever; however, if my trade has to be dumbed down to this level for the "Hands on Guys" then those guys need to find another field. McDonalds and Walmart are always hiring. If this seems hard on those guys, its harder explaining away their inabilities to a hard paying customer. It is also harder to find the time to go back behind them the second time to fix their recall and injured customer confidence/relations.

H.V.A.c. in a nutshell

BUD WARD
August 19, 2008
that is just a small list of the many things you need to know to work in the field.WHICH BRINGS US BACK TO THE SAME OLD ADAGE,HOW MUCH ARE YOU CHARGING ME? THE AVERAGE JOE HAS NO IDEA WHAT YOU NEED TO KNOW, THE TIME + EFFORT TO CONSTANTLY TRAIN. THE EVERYDAY CHALLENGES WE MEET+ THE IMPOSSIBLE JOBS WE TURN INTO ROUTINE. THEORYS ARE JUST THAT!

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