Is there any way to get a three-way mixing valve to work without another pump?

[SteveJ]

I am installing a mixing valve AM102R-US-1 into my system to reduce the temperature to the radiant heating loops.

The installation diagram from Honeywell is shown below.

The extension to my system is shown in the next diagram.

In my diagram it appears that there will be no flow through any of the heat sources if a single pump is used.
If a pump is added with each heat source (like no fossil) and the existing pump is removed then there appears to be no flow through the cold supply to the mixing valve.

So, how do I reduce the temperature to the radiant loop without using another pump?

Thanks,
Steve

 

[BrownianHeatingTech]

In my diagram it appears that there will be no flow through any of the heat sources if a single pump is used.
If a pump is added with each heat source (like no fossil) and the existing pump is removed then there appears to be no flow through the cold supply to the mixing valve.

If you want to use the thermostatic mixing valve, you need to install a pump on the mix outlet. That will "suck" water through both the hot and cold supply sides.

Joe

 

[SteveJ]

Is there an alternative way to lower the temperature for the radiant zones?

Something other than a mixing valve?

Thanks,
Steve