HVAC Temp Rise Formula used to Measure Airflow CFM!

In this HVAC Training Video, I Show How to Use the Temp Rise Formula to Measure the Airflow CFM of an Air Handler with Electric Resistance Strip Heating. I show how to Measure Voltage, Amperage, and Delta T Temp Rise. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
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[MasonNesson]

AC service tech channel is the most educational and beneficial HVACr show on YouTube . Very thorough and caring couldn’t ask for a better teacher . Thank you Craig

[wayneschneyer]

I noted all the younger techs watching these videos, as well as us seasoned veterans, that’s why I posted the previous message about explaining the two values, 1.08 and 3.414.
I hit the send button before I finished my message.
Thanks for your great contributions to our trade!

[Karnol]

I am going to hvac technical school right now and this video far better exceeds how my school teaches things

[dammo]

Thanks very much for this video it cleared some things up for me and helped me to learning it, I did this today in hvav school, and then just seeing this video alone gave meore motivation my class schedule has been messed up lately due to covid but this is just what was needed.

[acrepairnearme]

Wow, great. I have always been interested in temperature rise check. Thank you. The next one of the themes, please Static pressure.👍🏼

[electricboogie]

Damn. Picture in picture! Sweetness! This was a great video.

[coling]

Was all set to purchase your book on Amazon but the shipping price was almost as much as the book... looks like a great book too

[wayneschneyer]

Craig,
Another great video!
It might be valuable to also explain what the 1.08 represents, ( value of standard air) as well as the 3.414, ( BTUs per watt)

[garymartin]

Would the delta T not drop the longer. the test takes? Is there a time limit? Perhaps just stop as the initial rise falls.?

[joetech]

Great video Craig, Thanks for your hard work.

[rickybrown]

Can you, or do you have a video exactly like this only for furnaces?
I only found one other video...he used the BTU's and the blower motor Amp and

I just trust this Chanel for my "education" I would love to see a video from you

[jimbola]

Excellent video their partner!!!! thank's a million! for sharing! Happy Thanksgiving!!!!.

[marauderlife]

Bro...Thank you....I've learned so much from you, thank you man

[JoseGuerrero-sjie]

Another great video sr. And the book have the information I need

[Jugc]

Where do you get 1.08 from. I'm complicated and have to know the details. Thanks in advance.

[mohammadalshaikhhasan]

Thanks for the great lecture.

But in many cases the machine will be cooling only, without heater. In this case does it apply the same also.

Finding the power input (input voltage × input current) and use it on the same formula which you use to figure out the CFM?

Thanks

[MJ-iyfb]

Hello Craig. Just bought your book, and I thought I would check out your website a little more. I noticed under "Total Weight Method" the table has an error in it. I wasn't sure if if was intentional or not. I though I would mention it. Check out " Refrigerant Weight Per Foot" table, left column says Liquid Line Size - twice. I think it is supposed to say Liquid Line Size then Vapor Line Size. I am curious if you put the error in there on purpose or maybe I am missing something.

[sprockkets]

I had some fun today. Goodman 95% furnace - input 69000 BTU

1. Gas Meter - 57 seconds to deliver 1 FT
2. 3600 seconds / 57 x 1015 = 64105 input BTU
3. 64105 x .95 + 60900
4. Temp Delta 43F
5. 60900/1.08x43=1311
6. Emerson full ECM motor set to 1325CFM. Just about right.


Of course that means my furnace is around 10% under performing. Hmmm...

[WillieMakeit]

great web site you have in the posted link above.