How Check Total External Static Pressure On An Air Handler Or Furnace
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- Опубліковано 3 жов 2024
- Total External Static Pressure is the pressure that is created external to the air handler or furnace in the duct system when the fan is operating. In this video we discuss how to check TESP (Total External Static Pressure and why it's important to know. We have many homes in North America with high TESP, this is usually caused by undersized duct work, or systems that or not balanced correctly as far as air flow. If a home is having comfort issues or premature failures of ECM motors, checking TESP would be one of the first things on the list to check.
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#staticpressure #totalexternalstaticpressure #hvac
Who is checking this?
All day every day. Best HVAC Know It All vid ever!
HVAC SIMPLIFIED is checking it.
Haha! Thanks!
Not enough are
That video coulda been way better.
I was always taught to point the pitot tubes into the air stream, like you did, its easier for me to remember it that way.
Very Important and opportunity to make more Sales with Integrity and Honesty
A clear and understandable presentation. Thanks!
Thank you!
That was very very helpful, Im going to start doing this . Thank you so much for this great informations as usual and happy hvacing buddy
You're welcome, I appreciate the channel support!
Maybe 20% of residential techs are doing this. I have never seen an industry so polluted with sales gimmicks and lack of training. It’s embarrassing.
Great video though. 👍
Agreed and thank you!
20% is generous. I just moved into a management position at supposedly the biggest and best residential HVAC company in the area. What I found was that out of approximately 61 techs, 4 or 5 are actually competent.
It is sad. And I am caught up in it
Agreed, we have all of our technicians trained on static pressures and importance of airflow where I work. It’s amazing the lack of knowledge when it comes to ductwork and how it works in unison with a system. If the Duct ain’t right, unit will never work right.
Great video Gary. Pulling the High Limit Switch to place a supply Static Pressure Probe there is a Great tip for when you come across a Cased Evaporator Coil. Perfect spot!.
How long can the furnace be run without the high limit switch in? Should I not let it get to phase 2 heating?
I asked if the installing company for my Rheem system could check static pressure as I had my ECM module fail after 4 years. They said they don''t that and don't "normally" carry a manometer with them (???),As temporary measures,, I cut a new return inlet on second floor and went to lowest filter rating above the 99 cent "models". I religiously change the filter after two months- maybe overkill, but the ECM is big bucks now that the 5 year warranty is over. In future any sales guy will have to measure the pressure and show me that it meets the new furnace/Ac requirements.The older furnaces had aircraft blower motors so it probably didn't matter what the pressure was.With knowledge I think I'll splurge on a manometer and test it myself!
Good explanation for checking static pressure which is rarely done or payed attention to.
I cannot believe you actually measured .5 “ with the ridiculous filter blocking of much of the free return air at the base of the drop. Luckily the furnace is only 60 - 80,000 btu which is running lower CFM .
80 000 btu is a big furnace when talking condensing! normal sized homes can heat on 40 to 60 unless a basketcase or where it drops below -30f.
Thanks for this.
You're welcome
Great video!
Thank you!
I'm having a hard time getting the right static pressure. I'm measuring before coil and after filter and I get a 1wc so I lower the speed of the blower to get my .5wc and now the air flow just seems too low I feel like I'm going to freeze the coil being too low or set off a high limit switch when heating the home. I'm just confused and need guidance.
If you wanted to test pressure after the indoor coil you would just put the static pressure tip above the coil in the duct work somewhere correct?
Yes
Great video.
Thank you sir
@@HVACKnowItAll you're welcome
Wish more techs would look past that pretty blue light opportunity and hook an extra gauge or two into the ductwork.
Yep!
I check esp and temp rise on every service and I’ve never seen a positive pressure on the return. Your manometer looks like it’s displaying a positive pressure on the return? Am I missing something?
It's in the negative port, so the display is a negative pressure.
When you have a furnace with a coil on top what are the normal static pressures you see in the field? Obviously the unit says its rated 0.5 in WC. That doesn't include the coil; with some of the new coils and matchups you can lose as much as 0.3 in WC through the coil. Combine that with a bad filter setup of 0.2 in WC you already are at 0.5 and you still have the ductwork, grills, and dampers. I typically saw 0.6 to 0.9 in the field. Most of the ductwork I came across was undersized for furnace with a coil. The newer blowers are nice because they can still deliver decent airflow up to 1 inch of static.
I did a bunch of testing on my own system and was able to lower the static to around 0.7 or 0.75. Dropped cfm to 350 per ton and put in a 20x25x5 media filter getting a 0.1 drop across the filter. I wanted to redo the plenum because its undersized right now 20x8 for 1000cfm is too small.
How about your field measurements of horizontal furnaces? What is a normal static pressure that you see in the field?
I would install a wider coil that had a txv
Is there any worry with having the furnace run without the high limit switch in? Should I keep it under a certain time or avoid going into the heating phases with it like that? What phase do you have it in to test static pressure? Phase 1? 2? Recirc? New to this and want to try this myself.
Also, if I can’t splurge for the y jack, what kind of manometer will do the job?
It's only a brief test that you do with the fan running. You don't need to have heating engaged
Why would it be a problem if it was below .5? Wouldn't that just mean that it has a little more airflow?
Not saying it's always a problem but could be in some situations
Hi Gary, thanks for the video. Its super helpful. Question: When measuring external pressure do you also measure the same for each Zone with damper on/off? I am thinking this would show if any duct work in any zone is having less air flow and building up pressure on the air handler...right?? I am assuming the pressure check probes still go in the same spots (after air filter) and (before the coil) when testing each zone as well
Thought you were supposed to go before filter then after? I’m new so I’m just asking lol
Thats checking filter pressure drop only what you're describing. I'm checking total external static pressure
you're a beast!
If I had an HVAC question where should I ask ?
on an online forum
Shouldn’t this be done during install? I just had this done and they drilled a hole in the cabinet and put a rod in it and pushed the other rod right into the return ductwork and took the static reading that way. Overall the reading was grossly high at over 1.0…new system was installed one year ago. They came out for the one year checkup and now say our ductwork is too small and want 20K to replace it all. Small 1K square foot home
You got a hack, they probably oversized your furnace if you got 1” of wc, should only need 20,000btu to heat that place in a temperate climate
Also, dirty blower motor squirrel cage!
Good informational video but what in the fuck is going on with that filter😭😭😂
Nothing, it's part of the stand!
I need a help I started learning but not understanding_i need the ohm's text chat and voltage chat plz join
👍
return air static pressure should be negative...not positive. you are a good teacher but something isn't right today.
It is negative, when it's on the negative port it just shows as a number.
@@HVACKnowItAll Hmmm. Well, then Yellow Jacket should add the dash in my opinion.
@@pitaeata8493 every manometer I've used is like this. If you put it on the postive terminal with a negative pressure. You'll see the negative symbol. On the negative terminal, there's no need for a negative symbol.
When looking at static pressure we look at the absolute value of the number. The negative symbol is irrelevant.
Lol, sure bud.. go tell yellow jacket they've somehow had it wrong the whole time.
the whole static pressure is a shit fools gimic to make more money
Lol, that's hilarious bud!