I show how to calculate the tonnage raging based on the BTU information on a data label.
HVAC BTU and Ton
January 11th, 2010 
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January 11th, 2010 admin 
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was wonderinf if you might have a sec to help troubleshoot, I have a customer carrier condesing unit fan on top for some reason fan is blowing downward i reversed fan motor doesnt blow at all i flipped blade and tried both ways only blows downward should blow upward right? ty for any help
Yes, the fan should blow upward. It’s one of those things that I’d be able to help if I were there.
customer said hasnt worked right in years if it had a ccw blade and needed a cc blade would that be the prob ya think, maybe someone put wrong blade on it?
I’d say that if you got the opposite blade rotation that you already have then that should do the trick.
i just learned all about this yesterday and today… and many people told me i wont be using this in the field once i get a job… is that true?
Can you make a video about sizing the cfm of the furnace to handle the exsisting system for retrofits. Transfering ductwork dimensions to cfm capacity.
I’d also love to see a video about the proper way to read a ductulator.
Thanks in advance
great vid man
Thnaks
can this apply then to being able to determine capacity of a/c by the btuh of a furnace? so if you want to estimate cooling loads by the required total heating load?
You use cfm and fpm for sizing ductwork , as well as picking the size of the A/C unit needed to condition the space. You can tell how much cfm an A/C unit can produce by it’s capacity. 400 cfm = 1 ton, therefore a 5 ton unit will give you 2,000 cfm. (5 x 400), You also calculate your duct size based on recommended velocity (fpm) for different zones.
Whats w this Ton stuff ? I thought a Ton was 1000 kilos :-/
One ton equals 12,000 btu.
Dr. Z, I have under some units are easier. But RUUD unit is one of the problem I didn’t understand. Can you explaint that?
thank you
Some manufacturers use model numbers that have a different nomenclature. That’s when you’re stuck having to get someone at the parts store look it up for you.
Thank you, I found out the RUUD unit(UAK037) is a 3 ton unit.
should I be concerned with large difference in the A/C and the cooling unit? If so, what’s the difference. Can you give me an example of what I would see if the A/C unit was higher (say 2.5 ton) than cooling unit (say 2 ton). Then if the reverse was true.
You wouldn’t be able to get the correct superheat in any case. If the condensing unit were undersize, the evaporator would freeze. If it were oversize, the condensing unit would stack refrigerant.
that’s right!!
thanks a lot man that really helps… i am a pretty ignorant person when it comes to things like this… i learned something thanks to you..
Thanks for watching.
Just a question… I thought 1 ton = 12,000 BTU/hr. BTU is unit of energy, where BTU/hr is a unit of power? What am i doing wrong?
1 ton = 12,000 BTU. BTU/HR: means British Thermal Units per hour. One BTU is the amount of energy that it take to raise one pound of water one degree F.
DR Z can you figure the btu.s by measureing current readings ? If so can you make a short video to prove the point thanks very much for your videos Pete from Newyork city electrician
I’m sure that it can be done. I all depends on the type of compressor. Be it scroll, reciprocating, centrifugal, screw, rotary, etc.
Hi dr zarloff just want to say you are doing a wonderful job in helping us young A/C techicians. im a A/C and refrigeration technician from Jamaica. a good topic would be types of compressor and how they work. respect, nuff luv seeen yeh man