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Old 10-26-2012, 07:27 AM   #16
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


Doc, No I havent considered the roof seems kind of impractical for a self install or ease of service
Beenthere the a/c wont be installed till after building has been completed I need to let the contractor know what I need or will have to cut through the brick after theyre done
foundation gets poured today, I'm a little excited this is getting built

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Old 10-26-2012, 10:57 AM   #17
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


The big drawback to roof mount is lugging the thing up there. There are two indy AC guys on my block, ever once in a while the round up some neighbor hood teenagers to get a unit on or off a roof. Bit safer from copper thieves, but those guys also steal aluminum ladders.

Draw back to ground level is the thieves so make sure it is fenced in, in area not readily seen. Most localities in our area have laws prohibiting scrap dealers from buying ladders and no coils unless licensed AC tech. But Build a big doghouse by unit, run heavy chain out of dog house door to hasp on wall , hasp about to fall off, held on by one loose screw. Big gnawed ham bone, big water dish with " Killer" or "Spike" written on it. That is if you don't already have a big dog name "Tiger." ( Do not write "Fifi" on dish.)

With split system you won't need duct opening in wall. Short run of coolant line thru wall, probably won't need additional coolant. Package unit you can do all yourself. Don't know about Lewisville, Mesquite requires permit on anything but 120 window unit. Installation or at least signed off inspection by licensed pro.
Are you running duct up the inside wall? Opening for ducting would be mostly hidden by unit. You could brick almost right up to rectangular duct, exposed outside duct, insulated and boxed in with ext ply siding, extending into opening. Minimal expand foam from can in gaps between bricks and duct box. Trim around opening with caulked, flashed, rain capped wood or pvc.

I'm sure you got here as soon as you could, but you will have to live with with being a Yankee for at least ten more years. Having a child born here lessons time. Remember, there are no beans in chili, Bar-B-Queing and grilling are two different things, Bar-B-Que is always beef brisket other meats must be named, never reveal recipes for chili or BBQ sauce even under torture, yall is plural, use of apostrophe (y'all) is optional, but considered to be an affectation ( you all is sure sign of furrin origin). The oil bidness is evil and corrupt unless outsiders are listening in which case any criticism is unpatriotic and commnist inspired. ( There is no U in commnist)
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Old 10-26-2012, 02:50 PM   #18
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


I've never put a unit on the roof without a crane. When hanging a furnace or air handler such as in a split system application for an above ceiling tile office/warehouse use a Genie Lift. Very easy to do things right seeing as how there's a tool for every job.
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Old 10-26-2012, 03:30 PM   #19
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


You must run the pipes through the wall before its bricked. A lot of people have made the mistake and waited until after. And they all regretted it.
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Old 10-26-2012, 03:53 PM   #20
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


Quote:
Originally Posted by beenthere View Post
You must run the pipes through the wall before its bricked. A lot of people have made the mistake and waited until after. And they all regretted it.
thats what I'm trying to figure out for a package unit what size opening should I make? before bricking
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Old 10-26-2012, 03:56 PM   #21
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


Get the spec sheet out. look at the layout and the amount of space between the return and supply. Figure your 16" pipes will be centered over those holes. that will give you your hole size.
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Old 10-26-2012, 04:03 PM   #22
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


one is 14"x14" and other is 14"x24" and 6.5" between them they can be supplied with adapterd to go from square/rectangle to 14" round so figure 34.5"x20" and then what would I use around the tubes- plywood and sealant?
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Old 10-26-2012, 04:08 PM   #23
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


They need to be either wrapped, or lined. They have to be insulated when ever they are outside the house. then the brick layer lays his brick around them. And the mortar can knit to the wrap, if you wrap it. Which is the easiest way to do it.
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Old 10-26-2012, 04:15 PM   #24
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


This is where duct board trunk lines come into pay, make the entire thing easy.

Beenthere is talking about fiberglass insulation which comes in rolls that you wrap around the metal trunk lines. Usually it takes stapling and some foil tape to connect it.

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Old 10-26-2012, 04:51 PM   #25
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


I know the tube needs to be insulated - was going to use flex duct to the hard duct then up the wall, across the ceiling - any sense insulating the duct if its inside the shop? I figure duct is better below the ceiling than in hotter attic not very good looking but its a shop not my home. I have also been looking at a large window unit- seems simpler but at a loss of effeicency Hmm....
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Old 10-26-2012, 05:01 PM   #26
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No need to insulate it when its inside the conditioned space.
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Old 10-26-2012, 05:08 PM   #27
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


Or ductless mini split systems. Simply a small condenser outside with copper refrigerant lines connecting to as many as four inside blowers that you hang on the walls. No duct work whatsoever. Pretty much just like your residential a/c system in your home minus the ducts. The refrigerant lines simply screw together, no vacuuming or anything needed. Plug in and turn on. Comes in heat pump mode so you'd have heating as well.

What the inside would look like.


Outside.


Total package and again, up to four different blowers on one outside condenser. This way you can hang blowers in specific areas of the shop. Plus each blower will have a remote.
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Old 10-29-2012, 12:36 PM   #28
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Tx shop being cooled&heated looking for info on ducting and heat strip sizing


Doc, I've looked at those probably better for a house with few rooms this will be an open 30x30 shop with 10" cieling. I really dont want to deal with the tubing to the seperate blowers - thats why I'm thinking a package unit


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