We have a radiator system that had some rads added to it to accommodate a basement apartment renovation project (and provide some extra heat to a main floor addition). Basically - we kind of willy nilly added rads and now need to figure out the "balance"...
Basically, we found there was a really bad "balance" between the upstairs (main + 2nd floor) unit and basement unit that we couldn't get right which is leading us to consider some zones.
I've attached a picture to give an idea of what the "branches" on our current setup look like.
I then have attached a picture of how I think we can move one branch to be able to get all the basement branches in a "zonable" area.
My main questions are:
(1) Where do valves go?
(2) Do I try and do 1 or 2 circulators (we have been looking at the alpha1 and alpha2 options mostly)?
(3) We keep worrying about water temperature and what happens when one zone is open versus both open versus none open. E.g. We found with no zones that if we turn all the rads off upstairs the rads get WAY too hot downstairs. We turn the boiler temperature down. Butttt then we need heat again upstairs and then the boiler temperature is too low it seems for all those extra rads we now want heat out of... can zoning solve this? What can solve this?
Some other information that might be helpful about our system:
Branch A + B + H: longest run is ~90 feet (so I calculate a pump head value about 5.5)
Branch C-->G: longest run is ~150 feet (so I calculate a pump head value about 9)
Boiler is rated for 135000 Btu (sooo 13.5 gpm??)
Thanks for any direction you can offer! (I note that I read the "zoning made easy" document and got quite a bit of useful help out of there. I probably need to read it again... but it seems tricky to apply it to a system I'm not creating from scratch either?)