Measuring Static Pressure on an Air Handler for Airflow CFM!

In this HVAC Training Video, I show how to use a Dual Water Column Manometer to Measure Total External Static Pressure to Set Airflow Speed. I double-check airflow with a Hot Wire In-Duct Anemometer. 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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #staticpressure #static #pressure #airhandler #cfm #pressure
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[jaymantwothree]

Spent $10K at a trade school bakc in 2006 and not 1 instructor is as good as this guy. Amazing explanation skills. Thank you.

[mattzurzola]

Every Saturday morning look forward to the notification I don’t comment a lot but I do watch the videos

[rodgraff]

If more techs took these readings and verified proper on every startup, the industry would have far less problems. This is the first reading that should be taken, as part of troubleshooting, before any attempted repairs are attempted. Good job.

[toyinorodare]

Now I understand this Static pressure Clearly.
I have been having difficulty of it in the pass.
Thank You!!!

[BartSimpson-nrdy]

As always, you make a very clear and concise explanation of what can be a rather complicated measurement.

As time is always a factor in watching a video, you are the best.

[Adman]

Your channel has helped me so much. Doing install right now, and wanting to go to service one day. You have so much useful information. Thanks for the time to make these videos to help the newer guys like myself!

[alexzapata]

You have a unique way of explaining things in a way that's very concise and accurate. I'll be purchasing your book.

[yaboydaniel]

Just purchased your E-Book last night. Great book and awesome job putting everything into easy to understand terms! Loving it so far!

[RJMaker]

Great Video, Thank You. I find it interesting that while manufactures require a recorded TESP for proper commissioning, they don't design in probe holes for that testing. I have always hated drilling holes in new cabinets..

[kamalnasari]

Beautiful teaching ❤❤❤ USA
Not even i listen but i keep your lessons in my memory .AWESOME . GOD SPEED✟✟✟

[pentearmacaco]

I'm wondering if this instrument doesn't measure Total pressure (static + dynamic)? If you measure the static pressure, you would measure at a point where there is zero velocity (like the wall of the duct). A pitot tube measures total - static pressure, giving dynamic pressure that can be used to convert to velocity.

[domingoluyo]

Excellent content, Craig. Great job at handling those who struggle to grasp your words as well. Keep up the good work!

[williamswan]

Nice way to make it easy to tune in proper airflow

[hubercats]

Helpful video, thanks. One thing that I find confusing is the use of the phrase “static pressure” (i.e., singular versus plural “pressures”). This description suggests that there is a single pressure measurement in the system. It seems that a better way to discuss this subject would be to describe the system as a series-connected set of components each having a pressure drop across it (i.e., pressure DIFFERENCES). This approach is akin to describing voltage drops across a set of series-connected electrical components.

[naviddavanikabir]

great video. question about your measuring device.
isn't that a pitot tube? from what I know, the hole at the tip measures the stagnation pressure while the holes on the side measures the static pressure? but both are connected to one pipe that goes to the reader. is that why you only mention static pressure and not stagnation pressure?

[deanmartin]

Great content. Your videos make me a better tech. This and the heat rise is how I prefer to set my airflow. Thanks for the video.

[hangngoaigiare]

Thx for the vid. Tell me if im wrong but im not totally agree with ur explanation here. So of course we have to measure the SP as close as to the air handler because in this case if we measure before that 90 degree elbow we leave out a whole lot of duct. So its just simply said we have to choose a measure point (not interfere by turbulence) so that we can account for the total length of the duct system. The negative and positive SP here just mean the return and supply air act on the manometer in the opposite direction doesn’t mean it a negative number. So the total SP is total return SP plus total supply SP. The TESP of a particular duct system doesn’t change unless we shorten or lengthen the duct. So if we increase the blower speed on the same duct system we got more velocity pressure but the TESP doesn’t change so no we don’t have to measure the SP again. Lastly to get the right air velocity of the system better do a traverse method because the blower wheel can be dirty over time and dont blow out the same amount of air as spec. Im still learning so hope u can point out where im wrong.

[jericosha]

Dude this video is so helpful. Proper explanation and easy to follow. You the man!

[genalisseabreu]

Hello and thank you for all your teachings . I just bought your book, workbook and cards . It’s like treasure box of information and I HIGHLY recommend all of them to anyone who is serious about mastering HVAC. I Have a question regarding airflow and static pressure. When you took your measurement you inserted the probe into the return duct. I live in Miami and here HVAC systems do not have a return duct. Instead the air handler sits in a closet with louvered doors. The return on the air handler is just open to the hallway outside the bedrooms . This is the case in all houses here . Where do I place the probe to measure static pressure ?