bypass loop-what temp to close ball valve?

[wtrass]

I have been running a Vigas 40 with 1000 gallons storage since about March. I did not install a ball valve on the boiler protection loop and plan to bring the system down soon to do so. I do have a caleffi thermal mixing valve set at 140. I can monitor the supply temperature from the boiler and I also have a temp gauge on the return from storage. I guess my question is which temp needs to be at 140 before I shut the valve? The boiler output or the return from storage? thanks

 

[maple1]

Return from storage. You should keep temp of water entering the bottom of the boiler above that.

But are you sure you need a ball valve? What makes you think you do? The Caleffi should take care of it all.

 

[wtrass]

I am not absolutely sure I need a ball valve but was thinking that would definitely force the water into storage. I suspect there is some plus or minus within the caleffi.

 

[leon]

I am not absolutely sure I need a ball valve but was thinking that would definitely force the water into storage. I suspect there is some plus or minus within the caleffi.

=====================================================================================================


Hello neighbor.

You do not need a ball valve If the Caleffi is like my B+G bypass valve you can shut it
off entirely and just let the water in the boiler and your heating loop(s) do all the work.

 

[wtrass]

Hi neighbor. Thanks. Hot enough for you today?

 

[leon]

Too hot, the next week is going to be worse according to the weather folks.
I have been dumping my dehumidifier 3 plus times a day on average to keep
up with the high humidity. in the back room where the coal stoker boiler
(now shut down)is.

 

[Bob Rohr]

I am not absolutely sure I need a ball valve but was thinking that would definitely force the water into storage. I suspect there is some plus or minus within the caleffi.

No need for a ball valve to make it operate properly. It is nice to have a valve on all three ports if ever you need to clean or service the valve. It may save a drain down of the system.