80 of small hydronic system cold

Brad White_49

Airbound. Eliminate that as a cause and your should be fine. May just take a bleeding at the convectors, otherwise a good purging.

For the future and FYI, see if your circulator is pumping away from the expansion tank connection point. You may want to install an air separator.

Sounds like an adorable little place. Ought not be hard to correct.

Dean_16

I have a small hydronic system in a 722 sq foot single room guest house. The four 4' convectors in the main room are cold, the small convectors in the bath and kitchen are hot. Circulator is running fine, water is hot leaving the boiler and still pretty hot returning.

Unit was just serviced...a new domestic hot water coil was installed Thursday, and my tenant noticed no main room heat this morning.

What could cause a single circulator system to "split?" Why am I getting great heat from two convectors and nothing (the supply pipes coming from the wall are cold) from the others?

Ron Schroeder

Juat a guess

but air bound especially if its a monoflow system hot water goes around but cold rads are air bound. Is the pump on the supply and pumping away from the expansion tank??

EBEBRATT-Ed

Bruce is probably right. They had to drain the boiler to change the coil and air got in the system. Bleed the system (or call them back) and that should do it.

Ed