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Thread: 2 HVAC systems, 2 outlet temps
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08-04-2012, 11:06 AM #1
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2 HVAC systems, 2 outlet temps
My first floor system is an old 10 SEER York 2T installed 1992. Flawless from day one, has only had routine maintenance, capacitor and contactor replaced, 5 2 1 start kit installed. Current temp outside 85 - unit running - air from registers is 57 degrees - works beautifully.
My second floor unit is a 2 year old Goodman 16 SEER w/variable air handler 2.5T. Current outside temp 85, air output from registers is 68 degrees. (moves way more air than first floor as I guess is expected in a higher SEER unit?)
Both units have TRION High Voltage electronic air cleaners w/ MERV 8 pre filters. Both have UVC in line.
Why would there be such a discrepancy in output temps? Why would the second floor always 'feel' more humid though the temps regulate just fine? I can take a 1st vs 2nd floor humidity reading if needed.
It it just the nature of these higher SEER units?
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08-04-2012, 12:18 PM #2
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68 is not right. And it has nothing to do with seer rating.
You're either moving WAY, WAY too much air, (doubtful), or there is some other problem.
A good tech will take several different readings, and should be able to find the problem."Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler
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08-04-2012, 12:59 PM #3
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I can think of many different things to cause it to perform poorly.
The list gets longer the longer I think about it.
Have a technician take a look at it.“I am for doing good to the poor, but...I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it. I observed...that the more public provisions were made for the poor, the less they provided for themselves, and of course became poorer. And, on the contrary, the less was done for them, the more they did for themselves, and became richer.”
― Benjamin Franklin
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08-04-2012, 01:01 PM #4
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It's difficult to forecast issues when we have very limited info. For example, we know not what the indoor temperature is, therefore we cannot see a temperature drop across the indoor coils. Old units looked for a steeper TD, on the order of 20-25°F. Newer units are designed for a smaller TD, 17°-20°F. So return air temp, on a properly sized, installed and charged system is more of the determining factor in actual supply air temperature. However, the operative work in the previous sentence is PROPERLY. If the system is not properly sized, installed (duct system too) or charged, then all kinds of readings can be affected.
If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!
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08-04-2012, 02:03 PM #5
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Goodman 16 SEER units often use a much larger indoor air handler then the outdoor unit. Good chance your installers left it set to factory settings, which is probably moving way too much air.
Post model number of both the indoor and outdoor unit.
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08-04-2012, 05:52 PM #6
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GSC140301A
Originally Posted by beenthere
AEPF313716
dip switches set for on 1 2 4 5 6 8
off 3 and 7
Outdoor temp 85
Indoor 73
starts off slow and then blows alot of air, way more than the York 1st floor older unit.
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08-04-2012, 06:06 PM #7
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Dip switches are set right. May not be charged right, or something else could be wrong.
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08-04-2012, 06:11 PM #8
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Have the tech slow the air flow to obtain the indoor dew point desired. Dropping the temp to 50-55^F is close to the 55^F dew point. This would result in 75^F, <50%RH.
Regards TBBear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"
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08-04-2012, 07:00 PM #9
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Ducts in the attic? That can kill performance right there. If the 1st floor unit has a basement furnace, that helps since the ducts are in a cold basement.
And as the boys say, high SEER especially with too much air, doesn't give the drop of an oldie.
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08-04-2012, 07:56 PM #10
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I can't help where the duct work is located. Originally Posted by BaldLoonie
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08-04-2012, 08:09 PM #11
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This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.
You can find the rules for posting and qualifications here.
Further infractions may result in loss of posting privileges.Last edited by beenthere; 08-04-2012 at 08:25 PM. Reason: Non Pro * Member
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08-04-2012, 08:12 PM #12
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This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.
You can find the rules for posting and qualifications here.
Further infractions may result in loss of posting privileges.Last edited by beenthere; 08-04-2012 at 08:26 PM. Reason: Non Pro * Member
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08-04-2012, 08:14 PM #13
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The return is 72 discharge 68 outside temp 82
about 1300 sq ft 4 second floor bedrooms, 2 BR, hallway, 2 story entryway
(It seems to cool off fine and may be oversized thus not running long enough to dehumidify - I wonder if I reverse DIP 7 and 8 yielding -15% cfm if that would help)
I can measure the pressures but was afraid I'd violate the DIY rules.
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