Mixing Valve for Radiant Heat

George_15

I have a 6unit apartment building with 6 zones and 6 booster pumps.... one for each unit. The 4 top units have baseboard heat and the 2 lower level units have radiant heat. These 2 lower units have the red Bell and Gossett pumps in the left of the pics. It looks like there is a mixing valve in line that comes up from the return and mixes with the hot supply line. I noticed that I had both the mixing valve and the hot supply line valve completely open all the way. Is there a recommended way to adjust these two valves for optimal heating without worrying about cracking the concrete? I was thinking with both valves open all the way I am feeding too much return water in there so I closed off the return valves slightly. Any input would be appreciated!


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JohnNY

By those pics...

you have no real control there and I don't see that any methodical approach or thought went into the installation.

That being what it is, I believe there is no good answer to your question without a site consultation by a qualified installer.

Sorry for the negative reply. Perhaps someone here will disagree.

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George_15

Thanks... I know what you mean about the way its currently set up.

Is there a specific high temperature to avoid any damage to the system due to cracking the concrete and the radiant piping?