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High Wall HVAC

Zeke

Well-known member
Joined
Aug 13, 2009
Messages
17,176
Location
Long Beach CA, the sewer by the sea.
As an experiment, I'd place a table fan on a ladder in front of the air handler and just down from it. I'd aim the fan at an angle towards the floor to pull the 120 degree air away and down and see what happens.

In my personal opinion I think these split units work better on the long wall of the room and with a flat ceiling. I can't be there, so I can't feel how the air is moving, but it sure sounds like the unit is recycling warm air before it gets distributed throughout the room. Ceiling fan or no, the warm air doesn't seem to be being forced down and away from the unit before it gets recycled. If that's the case, it won't make much difference how the t-stat is set up.

I have a similar problem with a window AC unit. Now and then I forget to clean the internal screen filter. Sometimes I run the thing with the filter removed to get the best fan performance possible. Your split unit should be able push toilet paper straight out for I'd say 3 feet. 2 at the minimum.

Disclaimer: I'm not an HVAC contractor or tech. I have installed a few systems, but not a split system. The ones I've seen take the air in from the top and blow it out of the lower face. That can't be the best set up for that loft.

On another recent thread here, someone installed a lousy little 4" return air duct 7' down to near the floor and achieved a 20 degree difference in performance on the heat side.
 
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mwbailey

Well-known member
Joined
Jun 30, 2012
Messages
821
Location
Rock Hill, SC
Zeke, I'll have to try the toilet paper experiment. From standing on a ladder, holding my Red Horse Saloon thermometer in the exhaust, I'm pretty sure I'll get at least 2 feet, maybe 3! I'm with you on just not getting the warm air down low enough before it cycles back up to the intake. I've been looking at high capacity ceiling fans -- the one I like best is called "Big *** Fan"! http://www.bigassfans.com/residential/index.html
Don't know if that will fit in my room, but it looks pretty impressive. . . .
 

JakeKohl

Well-known member
Joined
Feb 23, 2012
Messages
1,365
Location
Greenville, SC
The installer probably tried to keep the line set within the distance that the units factory pre-charge would handle. That way he doesn't have to weigh in refrigerant, 410A I'm assuming.

Aaaa...good point - that's probably what happened. I topped off the charge on my units because of the longer line sets than the factory pre-charge would support.
 
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pseudorealityx

Well-known member
Joined
Nov 10, 2009
Messages
999
Location
USA
Zeke, I'll have to try the toilet paper experiment. From standing on a ladder, holding my Red Horse Saloon thermometer in the exhaust, I'm pretty sure I'll get at least 2 feet, maybe 3! I'm with you on just not getting the warm air down low enough before it cycles back up to the intake. I've been looking at high capacity ceiling fans -- the one I like best is called "Big *** Fan"! http://www.bigassfans.com/residential/index.html
Don't know if that will fit in my room, but it looks pretty impressive. . . .

Big *** Fans are a really good product.
 
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mwbailey

Well-known member
Joined
Jun 30, 2012
Messages
821
Location
Rock Hill, SC
As a follow-up to my issues with the split system, I didn't get good cooling once the termperatures hit 80 degrees or so. HVAC technician came back out -- same one as before during heating problem. He said system needed to be evacuated and recharged, but under the heating cycle he was not able to see that need for sure. Just to check, he did a pressure and vacuum test on the system; everything OK. Then he charged with a measured "full" load. I can say that the unit is cooling better now. I'm still interested in the results during a 90+ day -- and, now I'm wondering if the recharged unit will work better for heating, as well. In the meantime, I've purchased a much higher capacity ceiling fan. I'll get that installed and wait for winter. . . .
 
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