My Paperback, E-Book, Workbook, Quick Reference Cards: www.acservicetech.com/store E-Book: play.google.com/store and search "AC Service Tech" My Paperback and Quick Cards: www.amazon.com/shop/acservicetech Tool List: www.amazon.com/shop/acservicetech Support the Channel: www.patreon.com/acservicetech Tools used: SDMN6 Dual Digital Water Column Manometer with Pump: amzn.to/2UGclNv SDMN5 Dual Digital Water Column Manometer: amzn.to/2x176im Related Videos: Explaining Superheat and Subcooling to Your Apprentice! kzfaq.info/get/bejne/aLl1d8hh2566gI0.html The Refrigeration Cycle Explained Step By Step! kzfaq.info/get/bejne/r9CdpaZ2ppfeeXU.html Why Measure Both Superheat and Subcooling? kzfaq.info/get/bejne/d6qGgLtys87Tqmg.html Total Superheat Method! kzfaq.info/get/bejne/qZ95ZMSH2s3Im40.html Superheat Charging Chart- How to Find Target Superheat! kzfaq.info/get/bejne/mK98bKWjsKnZmpc.html Connect, Measure, Disconnect Procedure! kzfaq.info/get/bejne/atV1ZtOczbDdnoU.html Checking the Charge Tools: Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq Digital Refrigerant Scale amzn.to/2b9oXYl Ratcheting Service Wrench amzn.to/2dGV4Nh FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Electrical Diagnosis Tools: UEI DL389 Multimeter amzn.to/2xAdaJf UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V Vacuum Tools: JB 6 CFM Vacuum Pump - amzn.to/2nqbvo8 CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY Appion Valve Core Removal Tool - amzn.to/2uYr8WL Appion Blue 3/8" to 1/4" Vacuum Hose - amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose - amzn.to/2uYg6Ro Yellow Jacket 1/4" by 1/4" 3’ hose - amzn.to/2umtcod Appion 1/4" by 1/4" and 3/8” hose - amzn.to/2Zyxzx9 Uniweld 1/4" by 1/4" 2’ hose - amzn.to/2GFov1Y CPS Vacuum Micron Gauge - amzn.to/2v1nM3O JB Vacuum Pump Oil - amzn.to/2mGrlXy Flaring Tools: Yellow Jacket Flaring Tool - amzn.to/2OBxGlM Spin Flaring Bits 1/4", 3/8", 1/2", 5/8", 3/4"- amzn.to/31BCs8Z Yellow Jacket Flaring Tool with Set Depth - amzn.to/2QIKsQH Yellow Jacket Torque Wrench - amzn.to/2NRR68Q Uniweld Swage and Flare Kit- amzn.to/2T55jyn Nylog - amzn.to/2MLJcch Ridgid Tubing Cutter - amzn.to/2DnjjR1 Wolverine Tube Reamer - amzn.to/2QGLyMV Swaging Tools: Manual Copper Tube Swage/Expander- amzn.to/2WRPa1M Spin Swaging Bits 1/4" to 7/8" for the Drill- amzn.to/2YQwwqS Uniweld Hydraulic Swaging Tool- amzn.to/2MlrI8m Uniweld Swage and Flare Kit- amzn.to/2T55jyn Uniweld Hammer Swage kit- amzn.to/2CzWMMU Uniweld 3/4" Hammer Swage- amzn.to/2CzXsSs Uniweld 7/8" Hammer Swage- amzn.to/2Mja5WE Uniweld Multi-Size Hammer Swage- amzn.to/2T3Cx1b Brazing Tools: Air Acetylene Torch setup - amzn.to/2aQalsb 15% Silver Brazing Rods - amzn.to/2gVLyLc Ameriflame Oxy Acetylene Torch Setup #1 &#2 Tip - amzn.to/2SRm3JF 40cu B Tank to 10cu MC Tank Acetylene Tank Fitting - amzn.to/2GxZZPi Nitrogen Regulator - amzn.to/2bXdR5f Uniweld NitroVue Flow Regulator - amzn.to/2GnsaAo Uniweld Nitrogen Flow Meter - amzn.to/2brvoBg Stay Brite #8 Silver Bearing Solder and Flux - amzn.to/2XIDJsY Aluminum Braze Rods - amzn.to/2IGNMu Refrigerant Leak Detection Tool: Accutrak VPE Ultrasonic Leak Detector amzn.to/2nFYKVe Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.

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

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

Bought the books and cards. The books and videos are the equivalent of a distance learning class! This where we are headed now!

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.

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.

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

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

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

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

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!

Ray here is a beast

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

Unless you in Florida, Georgia, SC, NC, better off with 350 cfm per ton for better dehumidification.

I love how you explained this!

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.

Great explanation. Thanks so much!

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

you are amazing with this videos

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..

Nice way to make it easy to tune in proper airflow

nice explanation and demonstration

Great Video. Thank you for sharing

Great job

Great video great explanation , thank you

Nice job and video

🤘⚡️🤘. Great info as always

Well done from beginning to end...thorough explanation not omitting any critical info,

Great content with good information.

Thanks

👏🏽 👏🏽 thank you 🫡

Nice share sir Thanks🙏

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.

Thanks for video it is thorough, well done and very informative. I have an older carrier 58mca-060-16110 furnace. I have a manometer to take static pressures but don't have airflow charts to calculate CFM. Other than expensive equipment is there any other way to go about it or can you point me to a source for tables? Thanks

If the filter is new when i run my test, then I'm inclined to overshoot the chart slightly to account for filter degradation. Maybe they accounted for that already. Who knows. Some systems are very sensitive to filter type and require a poly fiber filter. (electric furnaces are famous for this)

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.

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 ?

Great video, thank you!! My furnace did not come with a filter. I have filters at the return grills. However, my ESP table assume a filter is at the unit. How would I handle this?

This video covers the static pressure per a blower motor that can be changed per dip switches or connector position. What about a Variable Speed Blower? Does the thermistor that is built into the motor module control the speed of the blower motor? In other words thermistors have value, so can the different value thermistors change the static pressure air flow? I have a Nordine made Frigidaire two stage gas fired furnace. It's a down draft unit because we are on a crawl space where the supply ducts are located. Last year the blower would not run. Upon inspection, I found that the motor windings were fine, but the thermistor in the motor module was cracked. I read where this is a problem others have had. The part number on the thermistor was not available per the electronic parts supplier. I found someone who had cross referenced the part with a number that was available. I got one and installed it, but I think the blower runs at a different speed now. I suspect our April air filter was dirty which blocked or reduced the air flow over the thermistor. This reduced the air flow which caused the heat to build up inside the supply plenum. The build up of heat cracked the thermistor. Would that be a possible cause of the thermistor failure? Thanks for the great video on understanding static pressures per the blower motor speed settings. Sizing the system per the home is so very important. We used the Manual D program to help size our furnace and new ductwork. I think it helped a great deal.

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.

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?

Very helpful video, Sir, how to charge split system in low ambient temp and how many ways of charging refrigerant in low ambient

Great video. If you have an open return with no duct work to the return side of the AHU how would you check static pressure? Thanks

If you are in a building with fire dampers sometime they will drop particularly around the kitchen area.

What kind of readings are you getting on a typical gas furnace with an AC coil for static readings in the field? It seems awful hard to obtain a 0.5 reading. Just the static drop from a coil and filter can use up 0.5. Just tested my furnace and it was reading 1.0 in WC. My 1 inch filter has got to go that alone is a 0.3 drop and I know my duct is undersized for supply and I do not have enough return air either. That AH install is so clean!

It is pressure difference between return side and the supply side

On the supply - are you measuring under the coil, or over? Does that depend on heating or cooling mode static checks (furnace vs. AC).

Great video as usual. Where can you get the manufactures airflow data info from if its not available the location where you're working?

Quick question. What if there is 2 returns, one on each side. Would you add all 3 values or average the 2 returns and then add that with the supply?

Has anyone here done ducted mini splits? I was wondering how the automatic fans maintain the static pressure on a small trunk supply setup

The HvacKing boys

Where would you get the manufacturers thing at to check the static pressure?

As far as I understand it, you mixed two approaches: 1. original, according to manual, you should measure static pressures using straight probe with opening perpendicular to airstream, air velocity does not influence measurement/value, probe should be placed as indicated in the manual, 2. alternative, using Pitot tube directed towards the velocity vector or air, you measure (differential guage) total pressure - static pressure = dynamic pressure, convert to speed, measure CFM using proper formula taking into account velocity profile (difficult, time consuming, possibly lower confidence level. Please kindly correct me if I'm mistaken.

When checking static pressure should the blower be on the highest speed?

I was looking at an IOM for an Amana. It gave the static pressure reading not including the coil. Weird.

Does the book also covers electric low voltage troubleshooting?

Where do you stick the probe if your filter is not in the duct right before the air handler such as a ceiling grill with a filter? Do you just stick it up near the filter in open air?

So when you have insulated ductwork do you cover that hole with a plug afterwards? I guess you need a insulation plug or flap to get access to the duct?

Hello sir. Is there a generic or common PSC motor air performance table one can use if manufacturer data is not readily available.

Question please >. I thought static pressure was determined by duct design, how did the static pressure increase from .3 to .4 just because you increased fan speed? THANKS, great video!!

Very informative.

Hey, Just a Noob here. Since you're talking about cfm needed for cooling shouldn't you refer to the wet coil sheet? 6:00

Ordered manometer going to test today…but my old trane air handler doesn’t have data available…any rule of thumb with no data and a 2.5 ton psc motor. Thanks

Can you recommend a cheap good manometer for a non-, professional home owner That just wants to measure static pressure? THANKS!!

Is any way i can buy the books for iPhone download?

Does a air handler box have negative pressure with access door in place?

If I had .72 and .26 I would add these together?

Where do the probes go exactly ? Right after the blower ? Someone plz explain

What co2 should I buy for wrk

👍

You are adjusting CFM for cooling mode , what I heating mode , you don't mention?

Why do we need to shut the condenser off and have it on cooling to set the static ?

Should the probe be before or after the filter?

Hi Hello sir. Thanks for the explanation. but I'm a bit confused, so suppose if I wanna start to design a fan from zero. the main parameters for this are the air flow, static pressure (pressure rise), and the fan speed (rpm). How to determine the static pressure ? can we put it as much as we want or is there any basic calculation to wisely select the proper SP for the design parameters ?. In my case, I'm about to use the fan to cool down some electrical objects (generator windings). pls help me.

I had a guy say my static pressure was 0.59 I think he pushed a hole through the supply duct? Is that high? If it is high does it always mean my ducts are leaking?

1 inches water column = 249 Pa, for the enlightened people.

I rarely see the airflow data sheet. where should i find that? just look at the manufacturers website and dig?

Where did you get that adapter for the monometer hose?

So how do I control the blower speed?

The HVAC videos do not discuss the increase in Electric Consumption from High Static conditions. Over the life of a Furnace, or Air Handler, the waste in power is Staggering, all paid for by the unsuspecting home owner. Ex: (At 1 amp per 0.1 inch (my furnace/AC is .2 over)=0.16KWH/hr., 1,250hrs/year, 25 Years, $.185/KWH gives $950 wasted over the life of the unit.)

Is the system running in this video?

Isn't that technically a pitot tube, not static pressure? Seems like 'static' pressure should be measured right at the hole without pointed into the flow.

How do I get your book?

Im afraid this that chart & how it was explained, left me confused then again im high🐾🍀

I have always been taught that static pressure in the pressure on the duct, not the airflow. Your probes should not be in the airstream but where the air is "static" as in not moving like near the bottom of that return box ant the top of the plenum on the other side of the duct.

File this under "Things that don't matter"

Not a very good instruction vid for the layman , need to explain the names of the components and abbreviations mean nothing to a layman 👎