HVAC Static Pressure Testing
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- Опубликовано: 7 сен 2024
- HVAC static pressure explained and its impact on the air flow in your home. A manometer is used to measure static pressure - a high static pressure indicates poor air flow and allows a technician to correctly diagnose your mechanical equipment malfunction. For more information, visit our website at www.althoffind...
The problem is not with pleated filters. The problem is far to many HVAC companies do not properly design and size the duct systems. I use Wrightsoft to assist in the manual J load calcs and munual S and D for equipment selection design and sizing of the duct system.
I include pleated filters on all of our system installations, because they filter better than rock catchers and the duct system was designed for proper CFM at design static.
On startup the TSP is checked with a clean filter in place and the blower speed is set to match the static and CFM it was designed at.
Really good explanation of pressure drop across the filter and the importance of ensuring low pressure drop across the filter!
Super simple yet informative vid, love it . The company I’m a CA at started checking static pressure every CA and tech appointment since January 1st (and the seer 2 changes)
Great way to add to jobs but also help the customers, instead of just charging an arm & leg
Best video I’ve seen on subject matter. 👍
A must watch for all home owners.
.4 is low What? The whole system is probably rated for .5, what about supply side?
Boy have times changed! In my day we saw a dirty air filter and just changed it because we realized it was blocking the return air and not enough air was going through the system. Nowadays we have to measure everything to realize the filter needs to be changed. Wow
You didn't increase the static pressure. You simply read a greater pressure drop across the dirty filter.
Good point. He doesn't know what static pressure is.
@@jamesdixon2860 agreed
If you have a dirty filter you are increasing your total external static pressure
If a 1" pleat filter is a problem go to a 5" peat you don't go to a rock and bolder filter
the first clean pleated filter give you a 0.4"wc as pressure drop. Is it too high? normally, the pressure drop of filter can not exceed 0.1"wc.
Not correct, the static pressure cannot exceed the blowers capability to deliver design CFM. There are a lot of factors that effect the drop across a filter, there is no one set pressure drop for filters.
sorry to be off topic but does anyone know of a trick to log back into an instagram account?
I somehow lost the login password. I would love any help you can offer me!
@Simon Gage instablaster ;)
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@@simongage6752 go to hell
Would putting a door on the filter access change the static pressure? It seems like the fan would be pulling air around the loose fitting filter?
So if you do a static PSI test before after the coil of the load of garbage that was pulled into the coil . It says please shut off focking furnace during filter change because cleaning your AC coil is much tougher than cleaning a evaporator coil.... Now you have to drill into the furnace and after the AC coil to see how much garbage was sucked into it while you was sporting filter changes on the fly. Or course depending on how old the home is and those so cleanly conditions and so judging on that brown filter they probably have pets. I don't suggest pulling out the filter on a running system. For testing I understand but.
You are totally right! If you pull a filter out for inspection, then see it’s dirty. Go online and order a new filter. Wait 5 to 7 days to receive the filter and then install it. You will definitely plug up the evaporator coil if you do this habitually. But if you have the new filter with you and it takes 30 seconds to pull the old one out and put the new one in, that will not hurt the evaporator coil one bit.
Also when the system runs in cooling, it is cleaning itself. The condensation rinses the dust into the drain.
"We suggest you dont use pleated filters so that we can come out and clean your evap later." Lol this guy
😅🤣😅🤣😅🤜🏼🤛🏼
The FPR 5 pleated filters are probably OK for most furnaces. Most HVAC duct systems are not designed for the restrictive allergan air filters.
@@picklerix6162 that is correct. State of California dove into this about 7 or 8 years ago and the result now is that each filter sold has air flow stats on it. Some pleated filters drop airflow in half. We use the 3M 1900 because it has a high MERV and also the best flow for a 1" filter unless you drop to like a low MERV filter.
Its all confusing to me I just had an energy assessment done all of my vents was .2 and my return was .7 with no filter those numbers didn't change when they tested with new filter in place. My system is a 4 ton air handler and condenser with a 3-5 ton capable evap coil. Evaluator said I am undersized by a ton for a 2,800 square foot manufactured home. I wonder what effect upgrading to a 5 ton overall system will have on those numbers?
Is this all about air filters. ?
So what is a normal static pressure differential between return and supply and at what point differential does it start to become a problem?
I want to go a step further and put a amp clamp on the power going into the air handler and see what the power draw is with a clean vs dirty filter. And with a system like this with that much room, why isn’t there a 5’’ media filter in there? I’d love to see the static pressure difference with thicker filters. Some people have systems where there isn’t room for one so we’re stuck with the lousy selection of 1’’ers. Also I’d love to see the quality of filters defined by their static pressure drops. I’ve read good things about 3Ms. Not saying they don’t have an effect but less of one than other brands. Also I’ve read a lot recently about how shotty some of these online filter subscriptions are. False advertising. No certifications. And expensive.
You really have to design a hvac system with the right filter in mind. Know that there is a good selection for the size return you have. And don’t be dumb and use a huge return for a small air return duct. (Where I live now they did that. Brand new construction. Makes is very hard and expensive to find filters.)
Dang ! 0.4 pressure drop across a new pleated filter ? Even for a high Merv filter that's way too high. Something's wrong.....maybe you didn't zero out your manometer?
A higher merv rating is going to cause more of a pressure drop than a lower merv rating, all else held equal.
Yeah, and he’s saying a static pressure is high but not to bad?? Way too high for most systems
Great video
Well done - thank you.
Well, yeah. Mfgrs need to design for larger filters but dude, the problem isn't the pleated filter, the problem is that the filter is fouled! Maybe most folks are fine with precisely all that gunk floating past their coils, into their rooms, whatever but almost everyone I've asked isn't. Change the filter more often! It's correctly doing its job. Duh.
Whats a rut cause?
you are measuring differential pressure not static pressure
Give some easy example about that static preesure
cool, so what do we do when the filter, like many are today, out in the hallway below (if system is in attic unconditioned space). do tell
Static pressure isn't just about a dirty pleaded filter it has to do with the ductwork system being undersized or not having enough return or supply vents.
"We don't like to just replace a part and leave, we like to dig a little further." Yeah because a customer wants to pay extra labor when all that was wrong was a cracked igniter. If they want to schedule a clean and check, great! If it's a no heat, fix the actual problem and move on.
I see that everybody doing videos are so perfect in a video, i've been more than 32 years in the business and most of these perfectionists don't give a sh@!!# out there only on video
Then they’re going to be pissed when you don’t tell them why the part failed. I’m assuming you take your job seriously John. So does HVAC techs. Lawyers don’t cut corner and neither does a good tech. You must be the guy that goes with the cheapest bid 😂
@@stephenrichardson4332 No Stephen, I'm the guy that fixes the problem and charges the customer an appropriate amount of money for the repair. I'm the guy that takes most of your companies customers and then inevitably one day, I see you featured in a hidden camera news story ripping off an elderly woman. You're the guy that really doesn't know how to repair hvac equipment, rather you only know how to bs people by telling them repairs are going to be thousands, until I show up and replace a capacitor for an appropriate amount of money. It's a pos like you that leaves a stain on the trade, but I have to thank you for all the customers you send my way. Keep it up sh*t for brains! 👍
you put in the old filter backward and you just let most dirt suck right into system.
yeah, but now the filter is clean!
I’m pretty sure he measured total pressure instead of statistic pressure.
what city and state are you in? USA?
Hi! We are located in Crystal Lake, Illinois. This is the NW Suburbs of Chicago.
Ok
You only checked the pressure on the filter. There are several more points you’re missing like the furnace it self or evap coil. This isn’t a complete test.
Exactly, I was getting ready to post the same thing but then I saw your comment, what a tool this guy! Lol
@@Aytown Nah, you're both tools. At no point did he say this was a complete video on static pressure testing on every component. If you can't figure out how to do the total static pressure, or evap coil pressure based on what he just showed, then you have a lot of learning to do. Your question is like asking an automotive mechanic how to change the remaining 3 tires after he just showed you how to change the first tire.
@@Jason-wc3fh the video's title's is; HVAC STATIC PRESSURE TESTING NOT FILTER TESTING
I don't think static pressure means what you think it means.
Lmao they're out there selling add ons/up selling equipment to their customers telling them the furnace is overheating because of static pressure and bad airflow. I'd have to guess and say that company has some pretty bad reviews 🤔
I don't recommend duct cleaning as they are idiots as well. They contaminate the home worse... Dog and pony show. Kool music bro...
That's why you don't hire a cheap company.
@@workinprogress008 It doesn't matter what company does it. They all do it wrong no matter what. If they remove the equipment or actually block off the supply air and return then it may be better. However nobody does this and created a popcorn particle popper at the furnace and the evaporator always shows the evidence of bad ductwork cleaning. I don't advise anyone getting their ductwork cleaned. The home owner does a better job just shop vacuuming the supplies and return where you can access. Just use pleated filters on the equipment and change every 2-3 months. Save some money and don't get your home and equipment contaminated. It is just a dog and pony show.
Yeah lets throw in some crappy filter that you can see through....bro we use 4" filters. Those 1" filters are a joke....or a trane clean effects. Still operate within spec...even if it doubles the static to .8" most resi systems operate spec to 1". So if your at 1" the blower isn't working that hard playa. You said to measure .. doesn't even take an amp reading on the blower...its not a "big deal" . So you don't care about your customers lungs...even if we run 1.2 to 1.3" ...what.... 1 amp difference..come on dude...i want to side with you but especially with comfort R and variable speed...this crap barely applies....sorry