House built in 2018. Design is a T ranch so the hvac system is also T shaped. Please be patient with my description here. All branch runs to the registers are 6” round and RA returns are 8” round. Both have multiple 45* and 90* bends to get them tucked into joists. Looks good but suffering on performance.
On the T shape supply truck, at all 3 end caps there’s branch runs at the last 3” before the end cap. The bedrooms reside at the top of the T where there are 2 end caps on the trunk.
It’s a carrier unit 92 efficient 450 PSIG located in the center of the design. Main trunk from is 8x20 and runs for 16’ to a custom T junction. One side of T transitions down to 8x16 for two feet then down to 8x8 for the final 10 feet. There is a top takeoff that’s 30” long and a side branch that’s 14’ all within this 8x16 transition, onto the 8x8 trunk is 24” to 1st branch(master closet no RA) then the 2nd branch(master bath no RA) and finally 3” from endcap is branch(mast bdrm) 10 foot long with double 90* bends.
Now the coldest rooms reside on the left side of this T design. This part of T junction goes from the 8x20 supply main down to 8x8. No smooth transition just a 90* huge transition. This runs 16’ to the endcap and guess what? 3” from the end is TWO branch runs directly across from each other(6”). It’s obvious that 3/4 of the air goes to one register leaving the other very cold room when door is closed.
I suspect the problems lie in both the custom T junction and the end of run branches, hope the whole design is salvageable.
As for the other end of the T or the bottom end is just a straight shot supply trunk/branch system with no issues really
1. Should the 90* junction be more of a Y and not a T or if itÂ’s ok make it look like a lowercase t
Meaning an endcap that protrudes past the junction for more pressure?
2. Should there ever be two branches across from each other? And so close to endcap no less
3. Can i run 2 new branch runs(6”) off the 8x20 main trunk before this T junction and eliminate those two runs which may improve the remaining branch runs(pressure)
Thanks guys IÂ’m not an hvac guy
On the T shape supply truck, at all 3 end caps there’s branch runs at the last 3” before the end cap. The bedrooms reside at the top of the T where there are 2 end caps on the trunk.
It’s a carrier unit 92 efficient 450 PSIG located in the center of the design. Main trunk from is 8x20 and runs for 16’ to a custom T junction. One side of T transitions down to 8x16 for two feet then down to 8x8 for the final 10 feet. There is a top takeoff that’s 30” long and a side branch that’s 14’ all within this 8x16 transition, onto the 8x8 trunk is 24” to 1st branch(master closet no RA) then the 2nd branch(master bath no RA) and finally 3” from endcap is branch(mast bdrm) 10 foot long with double 90* bends.
Now the coldest rooms reside on the left side of this T design. This part of T junction goes from the 8x20 supply main down to 8x8. No smooth transition just a 90* huge transition. This runs 16’ to the endcap and guess what? 3” from the end is TWO branch runs directly across from each other(6”). It’s obvious that 3/4 of the air goes to one register leaving the other very cold room when door is closed.
I suspect the problems lie in both the custom T junction and the end of run branches, hope the whole design is salvageable.
As for the other end of the T or the bottom end is just a straight shot supply trunk/branch system with no issues really
1. Should the 90* junction be more of a Y and not a T or if itÂ’s ok make it look like a lowercase t
Meaning an endcap that protrudes past the junction for more pressure?
2. Should there ever be two branches across from each other? And so close to endcap no less
3. Can i run 2 new branch runs(6”) off the 8x20 main trunk before this T junction and eliminate those two runs which may improve the remaining branch runs(pressure)
Thanks guys IÂ’m not an hvac guy
source https://hvac-talk.com/vbb/showthread.php?2224126-New-build-cold-rooms-Opinions-please&goto=newpost
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