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Old 01-08-2013, 07:47 AM   #16
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22 vs 410A on a hot day


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Unless you had your duct work altered, good chance your only getting 3 to 3.25 tons worth of cooling. And it was your under sized duct work that was the problem, not the A/C size.

What is the temp difference across the evap coil.
Cant tell you that right now, Winter. What I can tell you is that when we put a hood on each duct, we got darn near what it was suppose to be pushing.

Using rheem critereon furnaces.

We also added returns in all of the upstairs bedrooms (4) which also helped.

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Old 01-08-2013, 08:56 AM   #17
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22 vs 410A on a hot day


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How tight is your home. The tighter it is, the lower the humidity will be.
Fairly tight, I've done a few things to seal it up over the last few years and although I've talked about blowing in insulation over the last couple years, am finally doing it this spring.
I've also disconnected the evap cooler and have done away with that mess also.
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Old 01-08-2013, 02:47 PM   #18
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22 vs 410A on a hot day


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Cant tell you that right now, Winter. What I can tell you is that when we put a hood on each duct, we got darn near what it was suppose to be pushing.

Using rheem critereon furnaces.

We also added returns in all of the upstairs bedrooms (4) which also helped.
So it may be the addition of the returns which also makes it easier to get more air through the supply that did the most good and not the increase in size.

how did you know what it should be pushing? Did you do or have a load calc done?
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Old 01-08-2013, 06:39 PM   #19
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22 vs 410A on a hot day


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So it may be the addition of the returns which also makes it easier to get more air through the supply that did the most good and not the increase in size.

how did you know what it should be pushing? Did you do or have a load calc done?

BT, you are absolutely right, no doubt the additional returns were extremely helpful. But having said that, the additional ton made a world of difference on the extreme hot days here in houston.

What I meant by pushing was, if the Rheem Crit. was rated at 1600 for 4 tons, once we checked all of the discharge vents upstairs, we got darn near all of it. With the previous system we were way less on the the 3 ton. Even on our 100 plus days here, its been great! Unlike with the 3 ton that just ran and ran and never seemed to do anything.

Its one of those installs that I am sure the manual J would not support, but in this case I the customer am satisfied.

The home builders AC contractor would use a generic manual J on all like homes, not taking things like location, direction and or trees in consideration. You cant do that.

We have one side that is exposed to due west sun!

Thanks!
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Old 01-08-2013, 07:11 PM   #20
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22 vs 410A on a hot day


food for thought. how much better would the 3 ton have been with those same extra returns.
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Old 01-08-2013, 09:49 PM   #21
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22 vs 410A on a hot day


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food for thought. how much better would the 3 ton have been with those same extra returns.

We had actually intsalled one with the old sustem and it helped some in that room, but over all if I had to do it over again, I would. I have the commfort of knowing that if its hot outside, I can get it cool.

Thanks for the discussion!


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