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HWBB Purging Question.

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steveo196042
steveo196042 Member Posts: 2
in Oil Heating

So I have a tankless coil oil fired

boil2.jpeg
boil1.jpeg

Thermo-Dynamics S100 boiler with 3 zones. Basement is fine. First floor is fine. Second floor all baseboards give "resonable heat" except for one room which is always 5 -10 degrees below the others on the second floor. There are no bleeders on the baseboards. So I bleed all 3 zones per instructions. Turn off valve, set zone valve locked fully open, hose in Depot bucket and keep emptying the bucket. Well this went on for 1.5 hours and it was still bubbling, albeit less than when I started. Heat seems a "little bit better" in that room measuring with a HF infrared gadget, but still not correct. Any ideas? I posted some pics.

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,633

    First thing is to check the water pressure in the boiler. For two floors above the boiler 15psi (the standard pressure) should be enough.

    It looks like a pressure gauge in your pic but it is too small to read.

    You could also set the other zone so they do not call and see if the circ can push the water through. If it is air bound it may not.

    Also make sure the zone valve for the second floor is open. With the 2d floor calling follow the pipe it should be hot leaving and returning to the boiler. See if it is moving water at all.

    Is this a new problem or has it always existed?

  • HVACNUT
    HVACNUT Member Posts: 7,244

    Is the feeder feeding properly?

    Try bringing the pressure up to 25 psi, then purge while maintaining at least 15 psi. It shouldn't take an hour and a half to purge a loop.

  • steveo196042
    steveo196042 Member Posts: 2

    Thanks guys! I'll post a pic of the pressure/temp gauge when I get home from traveling. Don't ask . . This actually started last year and since the colder BB is in a room we don't use much we never really bothered. What puzzles me is AFAIK, the baseboards are in a loop per zone. So hot water in —> baseboards get hot—>colder water out and back to the boiler to get heated again. So if these HWBB are all in the same loop, wouldn't an air bound one prevent the water from returning back to the boiler which would screw the others in the same loop? What am I missing. Except my plane flight… ughhh…. TIA

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