Everyone stand back.
This only happens every once in awhile, and you don't want to get splattered.
2 ton, 2.5 ton coil, 900 cfm
Everyone stand back.
This only happens every once in awhile, and you don't want to get splattered.
Yes ,please.Originally posted by BamaCracker
Need more info? Just ask.
Sometimes there are compounding complexities of multiple variables that are not intuitively obvious
Well dang! You only undersized it by 1/2 a ton! That ain't too bad, since the original "expert" put in a 3 1/2 ton unit on a 2.5 ton load, and the house was so uncomfortable we hated it. I finally installed a 3 ton, 2 speed compressor, and converted it to heat pump. It was still oversized in cooling (maintained 67 degrees on a 107º day) when on high speed, but the humidity control from running in 1/2 speed was awesome.
The load calc called out 31,650 total capacity.
But, the truth is, you did not meet the challenge you threw down for yourself. The two tons you specified would have me calling you out to replace or correct it.
Perhaps it is not rocket science, but you are NOT doing it correctly.
Hindsight is NOT a plan!
Now what you don't know sir is who is right or wrong, you said that I undersized by a half ton this must mean that on a design day your unit is running full out all the time correct ? if this is not correct then you don't know how the 2 ton is going to perform because you have not maxed out the one you have. And without looking I doubt that the design temp is 107 degrees.And isn't it standard practice to be under than over and don't you think the 2 ton with a 2.5 ton coil would provide dehum.
[Edited by fat eddy on 02-25-2005 at 09:45 PM]
Good clean healthy debate between the pro's. I respect that. A cold one for everybody in the room. But what size AC and heating unit do I need? Who you callin old fat eddy? Well maybe I'm a little old...
Get a contractor to do a load calc, coldbud.
Guessing is bad.
The debate was not over whether or not I could match your load calc. It was whether or not I could choose the right equipment for your home, and I did.
Ho Hum, Ho Hum,
Still waiting around to get splattered.
He probably went to bed.
I probably would have too if I would of lost. lol
So lets get this straight, even after you find the load is 31k, you still think 24k will do the job at design conditions, and the oversized evap and 450 cfm/ton is for extra latent capacity, am I reading all this right?
You don't want to go there, eddy. You didn't "win" anything.Originally posted by fat eddy
I probably would have too if I would of lost. lol
let the wife go into menapause and chuck ya load cals out the windows hahaha
Wait, maybe this setup has one of those modulating cap tubes
Funny Fox...I see ya in the same area as myself. Just more North then me. Iam soooo down on H/O this week freaking cry wolf asses they are sometimes.
What part was I wrong on, do tell me please. he did a load calc it came out to 31k which is less than 2.5 ton but close, load calcs in general tend to oversize by 20% that puts me right on the money and I assure that the size I chose would handle his home on any design day.
He also stated that he chose to go with a two speed compressor and that he got good dehum when it was running at low speed ( which is probably all the time) low speed is typically 60%, 60% of 36k is about 21k.
You are always better off undersizing than oversizing if you undersize you will get better pressures in your system.
The 36k unit kept his home at 67 when it was 107 out, would that make you think that it is still grossly oversized?
He actually ended up with exactly what I recommended a two ton unit with an oversized coil. And thats all he needed for design conditions. Case Closed,
That 2 ton Fast Eddy's going to put in is probably 23,000 BTU, maybe less with an oversized coil. So you missed byOriginally posted by BamaCracker
Well dang!
The load calc called out 31,650 total capacity.
But, the truth is, you did not meet the challenge you threw down for yourself. The two tons you specified would have me calling you out to replace or correct it.
Perhaps it is not rocket science, but you are NOT doing it correctly.
3\4 of a ton. Thats 30% off or a failing grade.
Don't wait around waiting for him to change it out to 3 ton if your check cleared already.
Oh and no load calc's don't oversize heat load by 20%.
I would go with the fella that wants your buis. enough to do a heat load. Then follow advice. I would disagree w Fat Eddie @ lean towards the 3 ton, in my experience, slightly oversizing is more beneficial in the long run.(We are in a dry climate here tho) . Heating wise, Hands down to slight oversize. Ductwork permitting.
Undersizing is best done with human practices. Dieting, saving money, not getting upset or believing your perfect,or cant learn anything, @ so on. Pehaps you Fat eddie, could undersize some of these issues, Then we all can say your a Fit Eddie.
[QUOTE]Originally posted by BamaCracker
[B]Well dang! You only undersized it by 1/2 a ton! That ain't too bad, since the original "expert" put in a 3 1/2 ton unit on a 2.5 ton load, and the house was so uncomfortable we hated it. I finally installed a 3 ton, 2 speed compressor, and converted it to heat pump. It was still oversized in cooling (maintained 67 degrees on a 107º day) when on high speed, but the humidity control from running in 1/2 speed was awesome.
Let me break it down like this. I can see that you guys are having a lot of problems with this so I will simplify it even further.I will use capitols on the important parts of his quote.
It was STILL OVERSIZED IN COOLING (maintained 67 degrees on a 107 degree day) WHEN ON HIGH SPEED. ( KEY WORD HERE IS WHEN )apparently at 107 out it didn't need to run hi speed very often and probably never would if he didn't try to keep 67.
The HUMIDITY CONTROL from RUNNING 1\2 SPEED WAS AWESOME.
If it truly is half speed or half capacity it is at 18k, now lets do the math folks.
36k 2 Speed =107 OA 67space temp = unit cycles to low speed
24k =95 OA single stage 72 space temp = unit satisfies and cycles off.
Beleivable ? the only realistic is yes Fat Eddy I can beleive that, anything other than that would be pure stupidity.
And here is the topper the guy does a load calc and it comes out to 31k so whats he do he goes and puts in a 36k
Thats exactly how the whole thing got started to begin with.
[Edited by fat eddy on 02-25-2005 at 11:52 PM]