Differential Bypass Valve Placement

solpan

Hi,
I want to add a radiator to an existing water system. I plan on adding a loop and a circulater strictly for this radiator. If I would install a TRV on the radiator I would assume I need a Differential Bypass Valve. Is this the proper location? I attached a picture.

Thanks

Rich_49

Will this lone radiator be a single zone ? How will it be controlled , on/off or constant circulation ? The bypass valve should be between the supply and return to the radiator and before the TRV . Hope you intend n using a really small pump . Is this a different zone than all other heat emitters ?

solpan

it will not be its own zone. whenever the tstat turns on the main pump it will turn on this additional pump. is there any problem by placing the dbpv on the supply with a loop? I have seen it being done is it a bad design?

hot_rod

why the two pumps?
Add the new radiator loop and install a delta p circ. When the TRVed rad calls the pump will make the necessary flow adjustment.

How many zones in the system now?

solpan

what will force the water through the new loop?

solpan

the system is only one zone

hot_rod

same circulator that is flowing thru the current loop, if you pipe it correctly. Maybe a drawing of what you currently have would clear it up. Is it a single pump single zone system?

Zman

Why would a 1 zone system that is not piped primary secondary need 2 circs? If you are trying to maintain minimum boiler flow using a differential bipass, what you have drawn is not correct. That water will just make a loop around the circ and not through the boiler.
I think more details or drawing or picture is needed.

icesailor

When this new pump runs, will it make all the other radiators on the single zone get hot because it is initiating flow from the boiler and through the zone?