Return and Supply Reversed

[silverfox1958]

I have a situation where i need a 3.5 ton gas pack with the supply and return on the opposites than most traditional units. This unit is about 6 ft off the ground in between 1st and 2nd floors and the lines are inaccessible. If you are looking at the openings on the unit the return is on the right and the supply on the left. I need the opposite. Does anyone know of a brand i can get.

[BaldLoonie]

Probably have to do some creative metal. From what I've seen, everyone is standard on what side the stuff comes in & out from.

[Saturatedpsi]

Probably have to do some creative metal. From what I've seen, everyone is standard on what side the stuff comes in & out from.

:ditto:

I would have to agree...years ago (and I do mean years) there was a maybe Fraser Johnson model with left handed connections I had to replace by scissoring the ductwork. ICP made a packaged heat pump with reversed connections, which has been discontinued in recent years. :(

[stickinit2thman]

:ditto:

I would have to agree...years ago (and I do mean years) there was a maybe Fraser Johnson model with left handed connections I had to replace by scissoring the ductwork. ICP made a packaged heat pump with reversed connections, which has been discontinued in recent years. :(Yeah, York also had a model like that way back in the late 80's or early 90's.and we too made customized scissor duct to connect on a change out. Our shop boy's(true tinsmiths back then) made a box that did the crossover inside for low crawlspaces and hard to access duct. To my knowlage it worked ok.However knowing what I have learned since, I wonder what the total static was on those boxes and the duct system.Bet was way outside recommended 0.5 -0.8 would even guess that they never checked it.I hope they did but thats when I was a green duct helper, so I was worried about wrapping(insulating)duct correctly and learning how to install S&Drive duct's

[hvacker]

The last one I did was a Borg-Warner. I don't know how long they made RT units.
stickinit2thman mentioned a cross over box. I had one made some years ago but my drawings confused the tinner so I made a model out of stiff paper and they made the box from there. It was a box with metal forming an X that allowed air to cross over into the other side w/o mixing.
Some guys make a box and run flex inside. I'm not sure how well this works.

[fmetalx]

However knowing what I have learned since, I wonder what the total static was on those boxes and the duct system.Bet was way outside recommended 0.5 -0.8 would even guess that they never checked it.I was about to say the same thing. It would be really interesting to see how that kind of duct work would effect the static pressures.

[genduct]

I would line up the supply and "connect the dots on the return with a big, fat, oversized return plenum. I think this will do the least harm doctor.

[S.T.Ranger]

I have a situation where i need a 3.5 ton gas pack with the supply and return on the opposites than most traditional units. This unit is about 6 ft off the ground in between 1st and 2nd floors and the lines are inaccessible. If you are looking at the openings on the unit the return is on the right and the supply on the left. I need the opposite. Does anyone know of a brand i can get.

Just as a suggestion, how about a curb? It might be possible to transition underneath and still keep a nice clean job.

I am guessing you haven't put in a bid yet, and also guessing that the existing unit sits on a platform, is that right?

If sliding it is impossible (which was the best solution I think), how would going up affect it. And how much more weight could whatever it is sitting on withstand?

[VTP99]

Lennox used to make a transition that went from side to side to over and under. Not that it helps you any.
The curb idea sounds good if it is a vertical set up.

[stickinit2thman]

The last one I did was a Borg-Warner. I don't know how long they made RT units.
stickinit2thman mentioned a cross over box. I had one made some years ago but my drawings confused the tinner so I made a model out of stiff paper and they made the box from there. It was a box with metal forming an X that allowed air to cross over into the other side w/o mixing.
Some guys make a box and run flex inside. I'm not sure how well this works.Good point, never seen the flex but I guess its easier.Box worked good but as I said I dont have any idea how much static it added to the system. If I went that route now a days I would try to oversize the passages. Dont do what I saw the hacks did on a service call I was on the other week. They just ran flex around each other and crossed it over like that. Looked like Sh**! Couldnt believe static was in line.But even a Blind hog finds acorns every now and then.:gah:

[stickinit2thman]

Just as a suggestion, how about a curb? It might be possible to transition underneath and still keep a nice clean job.

I am guessing you haven't put in a bid yet, and also guessing that the existing unit sits on a platform, is that right?

If sliding it is impossible (which was the best solution I think), how would going up affect it. And how much more weight could whatever it is sitting on withstand?Thats actually a pretty good idea especially if its not seeen from street.We actually did that on a church rec. building a long time ago. I cant remember now why we did it. Its been that long ago, but it very well may have been to cross it over.Youre talking about a roof curb adaptor right? But after typing this I realized its the same thing as a crossover box and wont be an eyesore.But it is a good way to relate what you want to your metal shop.If you dont have very good duct skills I would definately have a crossover box made by your duct shop.It will be alot less aggrivating and painless not to mention looking alot better.

[swift one]

I did two this past summer 1st was a down draft most expensive 5ton curb ever. 2nd was side draft on a stand made of angle iron.and a huge transition. Had curb mfg come out and measure. made it very easy

[S.T.Ranger]

Thats actually a pretty good idea especially if its not seeen from street.We actually did that on a church rec. building a long time ago. I cant remember now why we did it. Its been that long ago, but it very well may have been to cross it over.Youre talking about a roof curb adaptor right? But after typing this I realized its the same thing as a crossover box and wont be an eyesore.But it is a good way to relate what you want to your metal shop.If you dont have very good duct skills I would definately have a crossover box made by your duct shop.It will be alot less aggrivating and painless not to mention looking alot better.


Basically, yes, but it will have to be built custom, and you know what that means...$$$$

I ran into a similar situation a couple years ago and called everyone for a suitable supply/return setup, couldn't find anything. I was hoping someone here may have known someone. I ended up making the fittings myself, and it looked and worked good, but I think I had more leeway than in this situation.

Six feet up already, and no mention as to how much room there is between the stubs and the unit.

A good fabricator could make it, just need to have a friend in the business...lol. Only have had to have one custom curb made, and it was expensive.


I did two this past summer 1st was a down draft most expensive 5ton curb ever. 2nd was side draft on a stand made of angle iron.and a huge transition. Had curb mfg come out and measure. made it very easy

Which is why I asked if the bid had been put in yet.

Ka-ching!