Piping radiant heat mixing valve

Billjulian

Seems the mixer may be piped incorrect. My question is how to bring in the cooler return water to the tempering valve so it tempers the valve. Right now Im getting 145 degree water on the mixed side and that is the coolest I can get. Im using a Taco 5000 3 way valve.

Thanks

kcopp

A Taco 5000

is pretty limited as to what you can do w/ it. With that setup a motorized mix valve w/ outdoor reset built... like a taco i valve would be best. http://www.taco-hvac.com/en/products/iSeries%20Mixing%20Valves/products.html?current_category=188

Billjulian

Radiant mixing valve

Thanks what model would you recommend?

Zman

How is the tubing installed

Is this a staple up application? Do you have the ability to measure the pipe temps accurately?

Zman

Upside down

Just to be sure... The "C" is pointed up right?

Billjulian

Radiant mixing valve

Ya the C is pointed up.

Billjulian

Motorized Taco 3-way valve

What will a motorized valve do for me over a Taco 5000? I never installed one how does a motorized valve operate?

SWEI

motorized valve

can change the supply temp based on the outdoor temperature.  This is called outdoor reset (ODR) and will improve both comfort and efficiency.

Billjulian

Radiant Mixing

Thanks Swei



What is happening is...the return water (teed in from the cooler zone) seems to be a problem. I am thinking of re piping the cooler (cold) side of the Taco 5000 so it is horizontal because my other radiant zone works fine. The set up is: Cold to the left hot to the right and mixed facing upward.

I think the return water is struggling it may be a heat trap if you look at the pic because when I put my hand on the cooler return water right at the Taco 5000 it is very warm not much cooler than the hot side.

NRT_Rob

.

what temp is the valve set for?



can't tell what your piping is doing. supply water (hot) should be on hot side, your mixed circuit return water should be cold side, and you should be pumping out of your mix outlet to the mix supply side.



if you are doing that you should never exceed the temp setting on the valve. you are getting near max temp so either you have it piped wrong or you have the setting at max.