Combining supply lines to manifolds?

skyking1 · June 19

I have two manifolds at the West end, a 4 loop and a 7 loop.

I have a total of 11 (3/8) loops. Do I need to make 2x home runs of 1" to the heat pump, or can I run a single 1" and tee it there?

It is about 5.5 GPM, about 38' of run from the heat pump and plumbing.

mattmia2 · June 19

is this hot water radiant heating?

3/4" copper pipe is good for up to about 6.5 gpm. if the supply is pex the id is smaller and you have to look at the chart, so one pipe is enough as long as you have a way to balance each loop.

https://s3.amazonaws.com/s3.supplyhouse.com/product_files/A1140750-flow%20rate%20chart.pdf

EBEBRATT-Ed · June 19

If you total max flow is 5.5gpm use 1" with a tee for both manifolds

3/4 is good for 4 gpm

1" is good for 8gpm

psb75 · June 19

Pex pipe pipe fittings have different ID specs. Uponor fittings have the largest ID specs—the ones MOST approaching actual nominal dimensions.

skyking1 · June 19

https://forum.heatinghelp.com/discussion/comment/1858145#Comment_1858145

Yes, the source is a ground source heat pump. Each manifold is the typical setup with balancing on the load and a circuit isolation valve on the return.

mattmia2 · June 19

https://forum.heatinghelp.com/discussion/comment/1858146#Comment_1858146

yeah, that supplyhouse chart is using some weird max fps, 4gpm is usually what is used for 3/4"

Combining supply lines to manifolds?

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