Thanks again everyone for your help with Radiant Heat Loop Not Working
I "thought" it was working BUT now it does not appear to work, well occasionally it heats up but never
I am wondering if I need to replace the tempering valve?
Now I "thought" the Red port was Supply (red), the blue Return (blue) and the Mix (pink).
This is a RTI (Radiant Technology) mixing valve which is >10 years old so I do not have any
I get warmer water when I turn the knob to the left contrary to the arrow.
Here is current piping:
Somebody has to be familiar with this mixing valve. RTI was a large distributor of radiant heat materials
10 years ago.Should the Return go to the Red port and Supply to the Blue port?
It is strange the first time when everything was cold when the thermostat called for heat
and the circulator kicked on with the mixing valve turned all the way to the right the pipes
did not get hot on the supply side but when I turned the knob all the way to the left the supply
got hot and the Mix got hot.
Now with the circulator running I barely feel the Mix side heat up and that appears to be coming from
the return as that is warmer than the supply.
The warmth in the return is residue from running all morning, it had gotten warm (not hot).
But at 10:00 a.m. I could not get any new heat from the supply it remained cooler than the return.
No matter where I turned the mixing valve knob I never get the supply to heat up.
Thanks for the much needed help.
It's down in the 20s in the early morning so I sure need to get this working.