1 inch return line

[mkengr45]

Increasing the volume of water in your return line could have a negative effect on the pump if it is not sized for a 1" return and how ever many feet of head. If the outlet on your pump is 1" and the specs give you flow rated with a 1" return then it would likely benefit. If not then you could actually slow it down with a larger return by creating more head pressure.

I looked up the mag 12. 1200 gph and 3/4 inlet / 3/4 outlet. My professional opinion would be that you will lose flow due to increased head if you go to a 1" return. The chiller has a 1" outlet so that installation would not be limited to a 3/4" return which is probably the average size for return lines.

Anyway. Just my .02 cents. Hope it helps.

- Dean

Nope...look up equations for head pressure. Perhaps your confusing head loss and head pressure. Head pressure is height dependent....head loss deals with restriction due to frictional effects, bends, lengths, orifices, etc...

[CoryDude]

With the 4ft of head pressure, and all the bends I'm running about 700 gph with the mag12. The plan is to have all rigid plumbing except for a small piece of flexible tubing from the pump to help with vibration noise.

its pretty much what I have now, but my new 1/2 hp commercial chiller had 1 inch connections so that's where the thought came from on the 1" lines.

[kkiel02]

Oh ok my old 180 had a setup like that. Now I run rigid drains and flex returns. Sounds like you already did the math so you should be good to go.