Hello,
First post after reading through many informative threads on WHD ducting.
My situation is potentially unique - aren't they all - as follows.
2700 SQ ft under air home in Southeast FL built circa 1986 so a little leaky. Lots of vaulted ceilings so the cubic feet is not based on 8' ceilings. New return and supply ducting circa 2012 along with a lot of extra attic blown in insulation and twin American Standard 3.5T ACs installed 2010 in utility room because the 5T HAs never lasted more than 3 years in the freaking attic. All replacements based on heat calcs, but still a bit oversized IMHO based on cycle times and such.
I guess think of the two AC systems as a hard split for 5BR split plan on one and open common space on second. No shared return or supply ducting. BRs do not have returns, but open plan airflow seems OK with open doors, etc
Also added a Santa-Fe RX around 2010 situated near returns, but also in an open space. More noisy than I'd like, but livable. Noticeable difference and can maintain 75F and 55%RH in most year round weather. Often 50% RH at 75F. But the RX is failing and so...
The only real viable location for WHD(s) is in the utility/laundry room most likely hung from the 8' ceiling joists (which would provide a nice gravity feed for condensate into AC condensate plumbing) with an open door for hallway and close to open area of the house. I mention that because attic space makes it unlikely or overly expensive to add dedicated return(s). The WHD(s) can be relatively easily connected to the supplies downstream of the coils. Backflow venting where needed.
1) Would someone re-explain why connecting the WHDs intake to the main return plenums is not ideal?
2) Is it a not ideal, but acceptable alternative to connect WHD returns to the dedicated AC return plenums?
3) Or is it OK to just use the intakes of the WHD(s) as is open to the utility/laundry room?
Looking at Santa-Fe or Ultra-Aire 70H low profile units. Possibly April-Aire similar sized units.
Thanks,
Pete
First post after reading through many informative threads on WHD ducting.
My situation is potentially unique - aren't they all - as follows.
2700 SQ ft under air home in Southeast FL built circa 1986 so a little leaky. Lots of vaulted ceilings so the cubic feet is not based on 8' ceilings. New return and supply ducting circa 2012 along with a lot of extra attic blown in insulation and twin American Standard 3.5T ACs installed 2010 in utility room because the 5T HAs never lasted more than 3 years in the freaking attic. All replacements based on heat calcs, but still a bit oversized IMHO based on cycle times and such.
I guess think of the two AC systems as a hard split for 5BR split plan on one and open common space on second. No shared return or supply ducting. BRs do not have returns, but open plan airflow seems OK with open doors, etc
Also added a Santa-Fe RX around 2010 situated near returns, but also in an open space. More noisy than I'd like, but livable. Noticeable difference and can maintain 75F and 55%RH in most year round weather. Often 50% RH at 75F. But the RX is failing and so...
The only real viable location for WHD(s) is in the utility/laundry room most likely hung from the 8' ceiling joists (which would provide a nice gravity feed for condensate into AC condensate plumbing) with an open door for hallway and close to open area of the house. I mention that because attic space makes it unlikely or overly expensive to add dedicated return(s). The WHD(s) can be relatively easily connected to the supplies downstream of the coils. Backflow venting where needed.
1) Would someone re-explain why connecting the WHDs intake to the main return plenums is not ideal?
2) Is it a not ideal, but acceptable alternative to connect WHD returns to the dedicated AC return plenums?
3) Or is it OK to just use the intakes of the WHD(s) as is open to the utility/laundry room?
Looking at Santa-Fe or Ultra-Aire 70H low profile units. Possibly April-Aire similar sized units.
Thanks,
Pete
source https://hvac-talk.com/vbb/showthread.php?2223937-WHD-units-located-in-a-utility-laundry-room&goto=newpost
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