see https://legendvalve.com/documents/iom/t-569%20and%20t-570%20tees%20iom.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...
Originally asked by user2407087 on Stack Exchange (diy) (CC BY-SA 4.0).