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Old 07-23-2011, 08:10 PM   #16
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What temperature should I be receiving from my vents when it is 100 degrees outside?


Since you posted these AMAZING values.....we wanna know how your designed system work.

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Old 07-23-2011, 08:13 PM   #17
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What temperature should I be receiving from my vents when it is 100 degrees outside?


Oh, it works very well.
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Old 07-23-2011, 08:34 PM   #18
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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It is set up at 890 1st stage, 1435cfm in 2nd stage, as it was designed to do, per the manufacturer spec's (Lennox signature series, model G61PV-36B-70). btw, thought that we were talking about helping the op, not diagnosing my system.

We are talking about helping him. You used you system's delta as a reply to him. Now he may think his should do the same, when it probably shouldn't.



You didn't list your A/C/condenser model. Is it a 3.5 ton condenser.
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Old 07-23-2011, 09:03 PM   #19
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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We are talking about helping him. You used you system's delta as a reply to him. Now he may think his should do the same, when it probably shouldn't.



You didn't list your A/C/condenser model. Is it a 3.5 ton condenser.
Nope, wrong again.
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Old 07-23-2011, 09:05 PM   #20
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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Nope, wrong again.
Wrong guess. But I see your hesitant to tell us what you have.
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Old 07-23-2011, 09:14 PM   #21
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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Wrong guess. But I see your hesitant to tell us what you have.
Why keep derailing this thread. Time to get the train back on track, or just let this thread go Beenthere, due to it appears that the OP has not found out what their problem is, or has solved it. As for my A/c, rest assured, it is sized properly, along with the furnace, and works as it was designed to do. As for the OP, there is something obvious wrong in their home, why it is taking so long to cool, with the Heat gain.
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Old 07-23-2011, 09:23 PM   #22
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What temperature should I be receiving from my vents when it is 100 degrees outside?


Still won't say what size A/C you have.

So you 24 degree delta, is meaningless to the OP.
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Old 07-23-2011, 09:31 PM   #23
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What temperature should I be receiving from my vents when it is 100 degrees outside?


I am still working the issue, will provide more details soon.

THanks for the help guys.
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Old 07-23-2011, 09:42 PM   #24
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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I am still working the issue, will provide more details soon.

THanks for the help guys.
I run my system at 280 CFM per ton. I get a 27 degree delta. I have done a lot of tweaking to it to get the delta I have.

My duct work is in the basement, so I have no heat gain on it. many people only have a 16 degree delta, and their systems are working as they should. there is no 1 individual temp difference for all A/C systems.

At 100 degrees outside, your system could only have a 14 degree temp difference and be working the way it should, depending on the duct system.

That doesn't mean it can't be improved. Often, adding some insulation to the first several foot of the trunk line can improve over all performance on attic installations. Also, adding more insulation to the return duct of an attic install can help a lot. The temp difference should be checked at the furnace/air handler.
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Old 07-23-2011, 09:52 PM   #25
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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You need to check delta T ( temperature difference between return and after coil ) normally 20F.

-Your house has temp 85F. You should be able to get 65F at register, if the ducts aren't gaining any heat. As soon as the house temp getting down the temp at the register will get down also.
I just completed the delta T test and here are my results:
vents: 60
right after the coil: 58
return: 75
outside: 80
tstat: 78
Also would like to say that this is during the night when I do not have problems, so I will be doing this again tomorrow during the day.
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Old 07-23-2011, 09:56 PM   #26
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What temperature should I be receiving from my vents when it is 100 degrees outside?


Is that return temp taken at a grille, or in the return duct at the unit.
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Old 07-23-2011, 09:57 PM   #27
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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No way to know if your system is low on charge or not with just pressure readings. Would need to know SH and SC to know.
Ok well I did have a leak in the evap coil which has been replaced this week.
They verified the system had no more leaks.

Also, sorry to ask but I do not know what the SH and SC nomenclature means.
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Old 07-23-2011, 10:05 PM   #28
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What temperature should I be receiving from my vents when it is 100 degrees outside?


SH, super heat. SC, sub cooling. These are what tells you what the system is doing, and if it is charged correctly or not.

Good chance, its not charged right.
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Old 07-23-2011, 10:25 PM   #29
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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Is that return temp taken at a grille, or in the return duct at the unit.
It was at the grill, but just went up and did it at the return duct and I am getting .5-1 degree warmer.
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Old 07-23-2011, 10:42 PM   #30
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What temperature should I be receiving from my vents when it is 100 degrees outside?


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Originally Posted by blarose View Post
I just completed the delta T test and here are my results:
vents: 60
right after the coil: 58
return: 75
outside: 80
tstat: 78
Also would like to say that this is during the night when I do not have problems, so I will be doing this again tomorrow during the day.
Delta 17 is good.

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