Air Handler and Duct Demo
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- Опубліковано 5 гру 2021
- The first step in a total hvac system upgrade is demolition. Today, we remove the entire duct network except for the 6'' runs extending across finished ceilings in the downstairs living space. Normally so much care does not have to be taken in the tear out, but I have to work around other appliances and stored materials and damage to those items is not acceptable. The extreme end of the system was not recorded because of tightness of space and I had to work around a freezer and water heater. Not matter, the meat of the matter tells the majority of the story and that is what you'll see in this video.
Once the duct is removed, the air handler is simply scooted to the side to allow progression of the new system. I did not want to pump down the a/c and cut the lines at this point as the time frame is short between this day and the onslaught of cold weather. Priority is to be given to getting heat back on before the severe weather change. The a/c can be dealt with at any time. I have that luxury on the subject because this is my son's house and he can't fire me for not getting it done in a timely manner.
It may look like it took a long time to remove but in actuality it was cleared, cleaned up with all the discarded materials in the truck in less than two hours time consumed. During the demo I found a number of things on the 'not to do' list for installers of hvac systems, and some of them may be brought out in the upcoming videos.
Prior to the demo, general measurements were taken for duct that is easy to see is going to be needed. With that fact in mind, you'll know a lot of the standard sized straight duct was fabricated prior to this day to stream line the process as much as possible. On the upcoming installation videos you will see multiple types of specialty fittings that are required for the new system.
So sit back, grab your favorite beverage and give thanks you are in the field you are in and not subjected to the challenges of your local hvac tech. I'm kidding. If it was a real tough job, I couldn't do it. Enjoy the noise and the dust, its a short video.... - Розваги
el exito deun buen trabajo es una buena planificacion segun creo ahora los conductos los hacen con papel defibra devidrio mas ligeros y mas aislantes saludos mi amigo wendall
Muchos contratistas utilizan la placa de conducto de fibra de vidrio. Lo usé mucho en la década de 1980. Pero todavía lo hago todo con láminas de metal, generalmente de calibre 26. Gracias, amigo mío, por los pensamientos sobre el trabajo de conductos en España.
Good evening Sir, so your son had a compress house !!! ; ) You are a very well experience man Sir !!! Great removal video Sir ( YES I DID READ YOUR TEXT LOL ; ) Cheers !!!!
Thanks for the kind words, mon ami. It's going to be a real tough job going back in too because there are a lot of changes being made to the system. Thanks for reading the descriptions Dave. It makes it worthwhile doing the extra bit of typing knowing there are those that enjoy it.
@@tractorman4461 Yes I realy do Sir Cheers !!!
Just ordered me a set of those clamp chains.
I tell ya what...those things are handy !! I hung 8' by myself all the time back years ago with them. But I prefer now to hang 4' or 5' material. Much easier on an old body and worn out shoulders !! Thanks Andy..let me know how you like 'em.
I'm amazed at how many HVAC companies oversize heat pumps and undersize the duct work. Back in the day we ran heat load calculations to factor in the number and size of doors and windows along with the sq footage of the structure to accurately size heat pumps. Watching you remove those drive cleats with a duct hammer brought back fond memories. Looking forward to this series!
Yes, the air velocity must be much lower for satisfactory operation with a heat pump. Heat pumps, as you know, are not capable of delivering the 140*F air like what comes off of a fossil fuel furnace. The standard sized ducting's higher velocity makes the discharge air off the heat pump feel cold and drafty. Heat Pumps have gotten a bad rap due to improper installation from the start.
I’m tippin me cup your way 44Friend! Duct work fly in every direction! Very fun to,watch this 44;adventure. Seen many duct constructions so this destalling is plum fun fer ser! Thanks Kindly my Friend and me best to All the 44 clan and a special squeeze for the Missus, who’s most likely at the mill, eh? DaveyJO
Yessir DaveyJO...DEstruction is much more fun the CONstruction. It's kinda like playing a bad guy in a class B movie. LOL. Yeah, she's at the mill.....NOT !! LOL. I can't let her have all the fun with that shiny new thing !! I'll apply the squeeze and make sure she knows its at your suggestion.... Take care and stay warm !!
This channel is a diamond in the ruff. thanks for passing down this knowledge to us young guys
Heck yeah man, no problem. Before you know it, YOU'LL be one of the old guys just like me. It happens quicker than you think Rickson !! Thanks for the cool comment.
Man Wendell you are rough on stuff just ripped that thing out. We may have to change your name to HVAC 44. Take care, Ben.
Hahahaha....it's too bad there was so much stuff around to damage or I would've knocked it out in a real hurry !! It's all for the salvage yard. Nothing useable in the pile for use with the new system. Thanks Ben for the visit and the smile !!
Wow incredible channel what a Gem. Is there anything you can’t do? Thanks for sharing the knowledge. Happy holidays!
Now that's a pretty awesome comment right there Richard !! LOL. I appreciate all of you guys tuning in and providing a bit of input is always welcome.
Interesting I loved 8 ft duct. I installed alone and 8 ft went smooth for me...but I did use 30 inch of pvc and the clamps on each end hung to the proper height. I found that set up fantastic...it held the duct very well and I was able to swing the duct on the pvc rather than the chain to make my drives.
I've installed many systems in 8' lengths myself. But it was almost always a bit of a strain even with the helping hands. But you know something...?? I never once thought of the pvc trick you used. Now THAT's a new wrinkle in the brain !! Thanks for the tip !!
8 foot runs is a handful for one person. I've made duct and hung it in many businesses. You may know Interbake, (makers of girl scout cookies), and Gateway computer company. Both in North Sioux City, SD. The only residential I'd done was on the side, (a nice break from industrial). I haven't forgot about the layout book. Hard to find extra time when I live on the road.
Doc
Yes, its a handfull for short guys like myself. Guys that are tall enough to reach the floor joists without a ladder fare a lot better. I don't know about you, but I gotta drag a ladder around all the time. LOL No problem with whatever you decide about the book.... And man, I hated to be out of town. I don't miss it at ALL !!
Great demo, Tractorman44. Most residential installers on a tearout would cut the hangers and let it fall to the floor making a big mess. Looking forward to the cabbing and install. Thxs for the vids!
This is going to be a tough one going back. Iirc, I counted at least 12 or 13 specialty fittings to tie everything in, including the wood fired furnace. Yeah, I used to get a little rougher on the demo, but this area had too many appliances and a NEW treadmill. Thanks David for watching.
Now I know the Y I didn`t become a tinsmith....just too much noise but I guess there is great satisfaction in seeing a new system go up....well demo and now for the good stuff....CHEERS
Hahahahaha...yeah there's the noise thing that's for sure. It really IS a lot of fun correcting a system problem. This one was major ! Good stuff coming down the pike pretty quick.
Was the old setup freezing the indoor coil with the duct being that small? Its incredible sometimes how easy things come apart with knowledge of how it should go together. THAT ONE STINKING SCREW!
Hahahaha....there's always one, right ? In this case only one. But it sure held. I don't know how the s's didn't blow apart on the sides. If it wouldn't have been for the appliances in the area, it would have been dropped a bit quicker. But even if it's my own son's I don't want to damage anything that's not part of the system.
No freezing of the coil, just excessive noise due to the velocity of the air flow and with 4 tons of blower on the undersize duct, and the 15 kw package had low temp rise. The discharge air temp coming from the registers felt like a heat pump of insufficient capacity trying to satisfy the thermostat.
Good to see the break down as well, like the Extra Hands.... I read your Description through but not catch what is the demo you talk about, did you mean it was up for training and demonstration purposes? sorry for the dump question 44🤣
In the building trades in America, the term 'demo' mean demolition. So on a job like this one, the first order of business is the demo....or removal....of the old system. It's just kind of a slang term tradesmen use all the time. Not a dumb question Jan. Even though you speak English very well, it is probably not your 'first' language so there's no reason for you to know or to be able to recognize all the slang terminology associated with the language. Thanks for the comment with the interesting question that once again indicates a partial language barrier between English speakers from different countries. I edited to verify the 'building trades'. Those are tradesmen typically on construction sites....plumbers, electricians, carpenters, iron workers, sheet metal workers, pipe fitters, concrete finishers, drywallers, painters, welders and laborers and even roofers to name most of them. There's others like heavy equipment operators that may be considered in the same category, but usually its the ones physically involved in the actual building construction from the foundation to the roof.
@@tractorman4461 Thanks 44, awesome explanation, as an Afrikaans first Language guy we use demo for demonstration because the Afrikaans word is very close, it is demonstrasie😅
@@jankotze1959 welllll....demo also means demonstration over here. It can even mean a new car, motorcycle or tractor at a dealership to test drive. In that case its kinda of a colloquialism for demonstrator. Or its an item being loaned for a short drive to demonstrate the vehicle. Both spelled the same and spoken the same as is the demo as I am using it for demolition. Hahahaha....English is kind of a crazy language. Kinda like hear and here. Or their, their and they're. The list is long.....which is also a tractor. LOL
@@jankotze1959 the English language is probably the hardest there is to learn, I have often heard.
You’ve done that before haven’t ya 😊
Hahahaha....A fella might make that assumption and be correct. LOL. But I LOVE being retired !!
Thank you. I would appreciate "not to do things" list a lot :) By the way, some people complain about some registers not supplying enough air, what is your opinion about booster fans? Thank you 👍
Oh my gosh...!! There's a list so long I wouldn't be able to do it justice. But during the installation I do touch base on some pretty severe nastiness where two riser take off the top of the duct for going to the second floor. So much of what to do and what not to do is really opinion once you get beyond your local codes. Unfortunately so much of my constant rambling gets edited out to keep the videos a conservative length. I don't think there are many that would watch hour and a half vids on an install.
About booster fans....I suggest that a system with a properly designed duct network based on the total cfm of the unit WITH the addition of 6'' balancing dampers in EACH run as close to the trunk line as possible would deliver the desired airflow with a little 'tweaking' to balance the individual register requirements. You know yourself there are registers delivering 2 times or more the cfm required. Throttle that and others like it back.....keep the air and the static up in the trunk and move the air to the suffering register, whose damper should be fully open. It takes time and patience but with individual dampers in the s/a take off's, it is almost always possible to balance out. That what we do with medium static commercial systems and also commercial high static systems supplying vav boxes and ftu's. BUT.... when necessary, a booster isn't too bad of a bandaid.
@@tractorman4461 thank you! 👍
@@qeesher Hey man...I just found three of your unanswered comments in my spam folder and deleted them by accident. I was trying to approve each of them and it didn't work correctly. But I do remember one said you wished for more HVAC and that you were going to hang around for more. So yes, there will be more as soon as I can. Sorry about the deleting thing.
... why did you decide to switch supply and return trunks?
The final stage of this system will be the addition of a forced air wood furnace that's going to tie into the side of the supply air tee in the new truck off of the air handler. Both plenums will be fitted with motorized dampers and control automatically.....but that's coming up. Hopefully you'll hang around a bit. I got a LOT of editing to do plus other videos as well.
@@tractorman4461 of course, i am hanging around. You know so much. There is so much for me to learn from you. I hope you will post more hvac stuff 😁👍 🙏 Will you be adding extra branches, or trunks only were undersized? Thanks
How do I correctly size my trunk line and air handler?
The first step in the process is learning how to figure the heat loss/gain of your home. You should be able to easily find a shortened version on line to get the answer you need. Once the loss/gain is found in btu's, size the air handler based on 400 cfm per ton of air conditioning. One ton is 12,000 btu's. Then you'll need a duct calculator and start with the air delivery capability of the air handler in cfm. For instance a two ton unit will deliver 800 cfm, a 2 1/2 ton unit will deliver 1,000 cfm etc. The duct calculator will have the information on it to properly size supply air ducting for the capacity of the air handler in cfm. I typically shoot for 700 to 900 fpm (velocity) in the main trunk. More than that will result in excessive noise in the duct. I know this sounds terribly difficult, but there is really no simple way to describe how to answer your question...so many variables I don't have firm input on, but armed with the proper heat loss/gain calculation and a duct calculator the job is very easy. I have to admit though, that it can be a formidable job for you if you are not at least basically familiar with the HVAC field.
@@tractorman4461 thank you, I’m working with about 800sqft and was thinking 1.5 ton With 4x12 trunk line, about 9- 6’’ supplies.
@@joshuacassino7297 well 1.5 ton will probably still have a 2 ton blower...they usually do. So you might still be looking at 800 cfm. With the proper size duct (4x12 is too small) you will deliver approximately 90 cfm per register. I don't have my duct calculator with me, but I would think 8'' x 14'' duct would be closer to delivering the air velocity adequately and at a much slower speed keeping the noise factor to a minimum. I will try to remember to check my calculator tomorrow and come back to this comment with a closer size. Will the air handler be at the end of the trunk line or will the air handler sit in the middle and blow both ways. That will have an effect on the sizing.
@@tractorman4461 I loo forward to your reply. Thank you.
@@joshuacassino7297 According to the duct calculator, a 4 x 12 duct even at 600 cfm (1 1/2 ton) will give a duct velocity of 2,100 fpm or feet per minute. Wayyyyy to high. The friction/100 ft also goes up to 1.0'' !! Wayyyy too high. Residential duct friction loss should be .1'' not 1.0'', thats 10 times higher. Now IF your air handler does deliver air at 600 CFM, a duct size of 8x16 gives .13 friction loss at velocity of 750 fpm...in the middle of the recommended speed for comfort and air noise. If it delivers 800 cfm, an 8x16 duct is marginally acceptable as far as the friction/100' goes slightly up to .14 and the velocity increases to just at the maximum speed for residences at slightly above 1,000 fpm. All this depends a lot on the way its going to be installed too. Like is the air handler to be at the END of the duct or is it going to deliver air in the middle of off set to one end or the other.....all that plays into the duct sizing.
I would suggest a little more research and obtaining a duct calculator, either a hand held or virtual, and look at all aspects of the potential installation. You don't want to make a mistake in design. I hope if nothing else, I've stressed the importance of pre-thought. Unfortunately I can't do it in a comment string. But now you have a toe-hold on the subject.
Ah HELPING HANDS, LOVE EM, ONLY COST YOU ONCE ,DON'T NEED A BRAKE DOESN'T COMPLAIN, NEVER SICK, NEVER NEEDS A SMOKE BRAKE. NO SOCIAL SECURITY TAXES.
I LOVE EM.
Hahahaha....yep, you are right about all that !! A lot of times, taller guys don't seem to need them, but me working off a ladder all the time ....I like them !! Thanks Tom. The system going back in is going to have a LOT of weird metal.....JUST for you my friend. LOL