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How to properly Purge with caleffi Fill/Purge cart?

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Mail4tommo
Mail4tommo Member Posts: 71
in Radiant Heating

The instructions that came with the cart isn't the greatest.. you think for the price it would be a little better.

So how do you properly Purge a system with this? Obviously you put a valve in the system with the hose bibs on either side of the valve..

But do you fill the cart partially? If you have the feed valve open won't it flood the cart? I just want to know how to use this thing right any help would be great thank you guys.

Comments

  • hot_rod
    hot_rod Member Posts: 27,518

    It depends on how you have purge valve set up. Are you doing a zone by zone, or the whole system at once. You can buy purge valves, Webstone is one brand. Or build your own with a ball valve and two hose valves.

    Get a Webstone, they have good purge cocks, better than a boiler drain for pumping into.

    Screenshot 2026-04-19 at 7.52.28 PM.png

    Shut off the fill valve

    Fill the tank with about 10 gallons of water.

    Pump into one valve, purge back into the tank from the other valve/ hose.

    If there is a lot o0f air in the system you may need to top off the tank. As air comes out water from the tank replaces it.

    You can also add a cleaner to the tank and circulate that for a day, if you have a dirty system.

    This graphic shows pumping DI water into a system.

    Screenshot 2026-04-19 at 7.43.29 PM.png
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 12,293

    Pretty easy instructions to follow. even has pictures:

    Screenshot 2026-04-19 at 9.54.53 PM.png

    Looks like you need to add their three valve fitting to the piping somewhere

    Screenshot 2026-04-19 at 9.56.35 PM.png

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • hot_rod
    hot_rod Member Posts: 27,518

    The pump cart is just a tool, there are many ways it can be used and connected.

    Mostly they are for filling systems with glycol.

    In some cases they get used to circulate a cleaner at high flow rates to scour a system.

    Filling solar thermal systems.

    Filling and flushing A2WHP loops.

    Or purging problematic GEO loop fields.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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