see https://legendvalve.com/documents/iom/t-569 and t-570 tees iom.pdf top diagram on page 2 shows my configuration.
I have Hot water baseboard, circulator system configured as a loop with radiators off the main feed (standard tee into heater, venturi tee out ). One of the radiators is not heating up. All the others in the loop work fine. I am able to bleed the system through the bleeder to the right of the heating element in the picture (and the radiator gets hot, but cools down when I close the bleeder valve). I think there must be air trapped between the bleeder and the venturi (t-569 in picture, about 10' of distance). How can I remove this air, or what else might be wrong.
Note this system is about 60 years old (radiators and radiator plumbing, remainder (boiler, circulators, valves, etc. about 23 years old) and worked fine before a lot of air was introduced into the system. It has been purged of air except for this problem.
I have Hot water baseboard, circulator system configured as a loop with radiators off the main feed (standard tee into heater, venturi tee out ). One of the radiators is not heating up. All the others in the loop work fine. I am able to bleed the system through the bleeder to the right of the heating element in the picture (and the radiator gets hot, but cools down when I close the bleeder valve). I think there must be air trapped between the bleeder and the venturi (t-569 in picture, about 10' of distance). How can I remove this air, or what else might be wrong.
Note this system is about 60 years old (radiators and radiator plumbing, remainder (boiler, circulators, valves, etc. about 23 years old) and worked fine before a lot of air was introduced into the system. It has been purged of air except for this problem.
