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Having Trouble Refilling/Bleeding Radiant Heat System
I have a water boiler with radiant heat baseboards throughout a house I purchase and am renovating. There are 4 zones: 1st floor, 2nd floor, basement and addition. Most of the pipe is 1/2" pipe but some of the runs are 3/4" pipe. I recently replaced two ~4' 1/2" baseboard units in the 1st floor zone with Slantfin Baseline units. I put in manual taco coin bleeders on the return side of the units. After finishing the install I have been having trouble filling up/bleeding the system. There are no bleeders anywhere except the two I just installed and one that is installed in the basement ceiling on a first floor zone pipe.
Currently i am getting heat to my first floor and addition. I have two auto vents, one right on top of the boiler on the supply pipe before the pump. There is another autovent a few few above the boiler. I forget exactly what pipe it is on. I have attached pictures of the two autovents. One looks clean and the other looks like it is corroded a little. I had the caps loose on both autovents for a few days with no luck. The corroded one started leaking after I pressed the valve stem looking thing under the cap. I tightened the cap but it is still leaking a little bit (hopefully I don't come back tomorrow to see the water heater blew up from that tiny leak).
I have 3 drains, one right off the boiler on the return pipe, one on the return pipe a few feet up from the first drain I mentioned, and one drain no the return pipe of the addition. I've bled some air from these drains but now water just comes out.
Can someone give me some advice on how to properly fill the system and bleed it, given that there are no bleeders in the second floor? I am less concerned with the basement zone not working but of course that should get corrected as well. I have attached some pictures to illustrate the setup.
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