Adding a radiant Zone

Zeornlo

Hello all, after much anticipation I have finally got my basement ready for heat. Originally my basement was gonna be set up with cast iron sun-rads that I converted from the old steam system to hot water. But as the project went on I had to pour a new slab so I decided to lay down tubing and go radiant. I used uponor hePex, 2 loops at about 270ft each, it's heating approx 500 sqft. I did get a radiant design done and this is what was recommended. My boiler is a gas fired non-condensing cast iron HB Smith. I have a it piped with 4 circulators one for each zone, controlled with an Argo ARM4P. The zones all feed cast iron sun rads.



I have never set up a radiant zone before so I was hoping to get some help from the forum. My intentions are this, from the current zone circulator (which pushes away from the expansion tank) into a 3 way mixing valve, into an additional circulator into my manifold. Coming out of the manifold to a T which brings me into a bypass loop and then back to my mixing valve, which would close my loop. I will be using a uponor 501s set-point control.



Would this be a suitable set-up?

Do I need another relay to operate my second circulator or can it operate off of my current Argo ARM4P which is where the zone circulator is hooked up?

If I do need another relay how is that relay wired in to my current system and what type is recommended?



I get a bit confused with all the different controls that start to come in to play when adding them into the current system.



Thanks for the help.

Alan (California Radiant) Forbes

You don't need

two circulators.  One on the mixed line is enough.  Look here:



http://www.mvsupply.biz/hrh_multiple_zone_schematic.htm

Cram48

Adding a radiant Zone

If I looking at the piping schematic the correct way, it is different than what I have in my current set-up as I have a circulator for every zone. 3 of my zones are on cast iron rads the other zone would be my radiant. All as main circulators for the loop. Heres a few picks. Wouldn't I still need to put another circulator after the mixing valve regardless. Or can I move the circulator after the mixing valve? The Black one in the picture is for the basement radiant.