New House Floor Heating Help

NavyGuy12345

I don't know why the valve on the left side of the manifold is closed. I just bought this house but can't figure out the slab heating. The boiler runs fine, just afraid to run it without verifying that I have good flow and unsure why the left side of the manifold would be closed.

If I hired a technician what would they be able to do? I mean is there a way to know where the pipes go? How loud should the pump be for the slab heating system? How can I verify system flow?

Should I open the fill line off of the hot water tanks to see if it adds water to my boiler system?

I did open top left vent valve directly above the temperature/pressure gage and verified fluid was there.

1). What are my options with the isolated left side of the manifold?

2.) How do I verify flow with my pump?

EdTheHeaterMan

From what I can see that floor heat has no way to circulate water unless there is some sort of obstruction inside that manifold. the water will not go into the tubing loops because water will take the path of least resistance.

EdTheHeaterMan

This is what I think you have

This is what you need to have with some sort of baffle or stopper to separate the supply and return of the floor loops.

And you will need to remove all the tubes from the manifold and put pressure on each tube, one at a time to see which tube is the other end of the loop by something coming out the other end. Then mark loop 1Supply and loop 1Return. Then go to the next one and label them S2 and 2R, then 3S and 3R until you know that you have all the loops labeled. Then you can connect all the Supplies to the hot side manifold and all the returns to the Return side manifold.

You will also need to put some sort of a mixing valve on the system with a low MIX temperature circulator to pump the low temperature water thru the floor tubing. That boiler can not operate at the low temperatures that are required for radiant floor heating.

GroundUp

Unfortunately that needs a complete repipe to work properly. That's a high temp boiler and will require some sort of mixing to reduce temp to the floor loops as well as to keep water re-entering the boiler return above 140*. Then the manifold situation as Ed mentioned (unless there is some magical blockage in the tee) isn't pushing anything into the floor loops anyway. Where are you located?