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Isolating Zones

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itowngirl87
itowngirl87 Member Posts: 3
in THE MAIN WALL

Hi team,
We’re back with another question. The house has three heating zones. While our dining room baseboard pipes are a bit oxidized, we’d like to reduce knocking sounds before winter's end. Can we isolate the downstairs zone to bleed air out?

We believe the circled pipe is the return to be closed that would allow for the isolation. With the boiler off, our plan is to hook up a hose to that zone for bleeding. The last photo with red handles shows the rest of the boiler system for reference.

Anything we should watch out for?

mark-up .JPG
IMG-20251210-WA0018.jpg
IMG-20251210-WA0020.jpg

Comments

  • hot_rod
    hot_rod Member Posts: 26,562

    purge one zone at a time. So close the large ball valve plus all the smaller valves above it, except the zone you want to purge. Then repeat with the others.

    Assuming the piping is like this drawing?

    On the brown fill valve, flip that hoop on top to put it into fast fill position. You need to keep an eye on the pressure gauge, stay below 30 psi as you purge with the fill valve in bypass. Be ready to flip the hoop back as you turn off the purge valve or you will over pressurize

    Ocassionally fill valves will not work properly afterwards if they have not been used in years.

    That air purger would like to have 18- 24” of straight pipe before it to do a good job of extracting air, not much you can do about that.

    IMG_1619.jpeg IMG_1320.jpeg
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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