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  1. New construction -- does main floor have too few return grills and registers?

    My supervisor is building a new home. As anticipated, the installers do not have any details related to Man D or J. The first story is about 3200 sq ft w/ 5 ton Carrier split system. There are two...
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    Shophound, I responded that they've done a...

    Shophound, I responded that they've done a thorough visual inspection, but not TESP test. I'll get w/ my tech to check the blower door, fresh air intake, and run the TESP test. I'll probably ask for...
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    The existing (and planned upgrade) return is flex...

    The existing (and planned upgrade) return is flex duct 16". It seems to be stretched pretty well. The supply side is 16" round sheet metal. Most techs really say they like it; it tapers every so...
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    Shophound, thanks for the reply. Is there a way...

    Shophound, thanks for the reply. Is there a way to actually measure the supply side to determine if I have a problem there as well?

    Backpacker
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    I have talked to two technicians and received...

    I have talked to two technicians and received offsite consultation from a third (not to mention everyone on HVAC Talk whom I really appreciate). Two of the three I spoke with agree that increasing...
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    RH issues are all downstairs with the Amana package HP

    The upstairs system sits on top of a plywood return box in the closet. RH upstairs stays below 60% year round. It's an Am Std 20 SEER and seems to work great.

    Downstairs is the big issue. I have...
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    The blower has already been lowered to its lowest...

    The blower has already been lowered to its lowest setting on the APH15 HP. This has helped just a little, but now the air from the supply lines moves so slowly there are spots in the house where the...
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    With the cooler weather here the techs are ready...

    With the cooler weather here the techs are ready to increase the size of my return duct to 18", add a mixing box, and add a second return grill and duct. Some questions about what the different techs...
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    Tech came but nothing new discovered; I discovered floor of package unit is wet

    I put a wireless thermometer on the bottom right next to my coil drain pan in the unit. The lowest temperature over a 24 hr period is about 57^F. I assume that's probably a few ^F over the actual...
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    Clarification on upstairs/downstairs; tech coming tomorrow!

    My RH problem is downstairs; upstairs is always much better. Agreed that my upstairs unit is oversized, but it almost always runs on 1st stage cooling only. I assume that is because I set the...
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    Answers to questions so far

    Awesome posts, everyone! Answers to several questions on the replies are:

    1) Location of home - North Alabama. RH issue is by far worse at night.
    2) Upstairs is 1400 sq ft
    3) Upstairs unit is a...
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    Duct sizes contributing to high humidity?

    My relatively new Amana APH1536 first floor package unit is not keeping my RH below 70%, particularly at night. My second floor fancy 20 SEER Am Std split system just barely gets it below 60%...
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    Very short trunk line

    The system currently has an extremely short trunk line (4 ft or so); most of the supply ducts all branch out from the same general area like a spider. Should this ductwork be changed out with a...
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    Trunk/supply duct sizes 3 ton to 2 ton

    When I moved it, I had a 3 ton system with only 5 supply ducts (6" flex). The static pressure caused a windstorm in each room. I had two more supply ducts added, and the rest of them increased to a...
  15. Blower speed has been lowered

    The contractor was very responsive and came back out and did some measurements. The CFMs at the unit were around 1300. The contractor indicated the switches had been accidentally left in the default...
  16. Taking a look at the calcs, the kW for the aux...

    Taking a look at the calcs, the kW for the aux heat is based on a line item called "Total BTU Loss". I don't see anywhere in the calcs that the capability of the heat pump itself is taken into...
  17. This explains a lot. I had my ducts cleaned in...

    This explains a lot. I had my ducts cleaned in Oct 2007 and they really did a nice job. But by this spring, the return was dirtier than I expected, even with diligent changing of the filter....
  18. Is there an easy way for the homeowner to measure...

    Is there an easy way for the homeowner to measure the CFMs before or after the filter or on the 16" flex return?
  19. The return is on the lower sidewall in a hallway....

    The return is on the lower sidewall in a hallway.

    The installer said they spec to 500 fpm at the grille, but I'm seeing 400 fpm recommended moreso than 500 fpm.

    Thanks.
  20. Whistling filter grille and aux heat wattage

    I had a new 3 ton Amana APH1536M41 package heat pump installed today.

    http://www.amana-hac.com/Portals/1/pdf/SS-APH15M.pdf

    The contractor ran a Man J and did an excellent job on the outside...
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    I will leave it to the pros

    Thanks for the replies!

    To answer the question asked above: all the supply ducts to the registers are flex ducts. I believe the trunk line is sheet metal.

    I should also mention that you cannot...
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    Loud air flow at registers

    My upstairs heat pump registers are quite loud (wakes guests up when sleeping, difficult to watch TV). It is a 3 ton Bryant split system. I'm wondering if there is a way to perhaps slow the air flow...
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    Thanks for all the replies. I took a look at the...

    Thanks for all the replies. I took a look at the psychrometry charts and it makes sense. Higher temp = more "room" for the same quantity of water molecules => less water per unit volume => lower RH...
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    Purchased a home last fall which had mold...

    Purchased a home last fall which had mold remediation in crawlspace, all underfloor insulation removed, replaced vapor barrier w/ solid 6mil poly, and replaced return and supply ducts. During the hot...
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