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Old 08-30-2012, 05:25 PM   #16
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R410 Vs R22 Humidity removal


My last post is my final answer. Plus a dehumidifier. Close those systems up. If there wasn't a problem to begin with then why connect two systems? Now when the upstairs system is off then of course the downstairs system is stuck doing the job of a 7.5 ton. Heck, even when it's running.

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Old 08-30-2012, 05:29 PM   #17
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R410 Vs R22 Humidity removal


Doc, yes, that's what seems to be happening. The downstairs handler was getting 100% of it's supply air from downstairs before. Now it's probably getting 60% of its supply air from downstairs and 40% of its supply air from upstairs since the upstairs supply lines are the closest path of least resistance. The 2 1/2 T handler may be getting a small amount of supply air from downstairs due to the pass-through, but not enough to compensate for the amount the 5T handler has dropped off from grabbing downstairs.

I'll try to close it off. I think this is going to do it. Fingers crossed.
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Old 08-30-2012, 05:30 PM   #18
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R410 Vs R22 Humidity removal


Please come back and let us know. This is a first for me!
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Old 08-30-2012, 05:42 PM   #19
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R410 Vs R22 Humidity removal


Will do, Doc.
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Old 08-30-2012, 06:12 PM   #20
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R410 Vs R22 Humidity removal


That cross over your installer did. is one of the worse things you can do to a VS blower.

Your house is more humid probably because the new VS blower is moving a lot more air then your old 5 ton blower did.

Have them cap off that cross over, and set your VS blower to 350 CFM per ton max.
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Old 08-30-2012, 11:44 PM   #21
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R410 Vs R22 Humidity removal


I'll look into that, "Been There". The old handler was a VS, too, but you may be right that the new one pushes more air. I'm definitely going to cap off that pass-through or have them do it.
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Old 08-31-2012, 07:41 AM   #22
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R410 Vs R22 Humidity removal


So did somebody actually size the new equipment or did they just figure it had a 5t so they just replaced it with another one of same size?
Im not sure why youd want to pull return air from an area the air handler isnt supplying conditioned air to either
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Old 08-31-2012, 08:02 AM   #23
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R410 Vs R22 Humidity removal


Plummen, I'm not sure if anyone sized it. It had a 5T before and each of 3 contractors that quoted the replacement talked of nothing other than replacing it with a 5T so I never questioned that. The more I think about it, the more I agree with your statement, "Im not sure why youd want to pull return air from an area the air handler isnt supplying conditioned air to either".

I think that's the root problem. The contractor's reasoning was that warm air rises and will travel from downstairs to upstairs so pulling the additional supply from upstairs would make for a more comfortable and efficient total system. I think, though, it was a solution to a problem that was previously non-existent.

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