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chiller vs boiler piping

Dick_3
Dick_3 Member Posts: 60
Is the chiller system a pressurized closed loop or a open loop (pumped loop with a open sump)?

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Comments

  • chiller vs boiler piping

    one's hot, one's cold, and both being circulated by a pump, but i'm missing the sense of this, and i haven't talked to the manufacturer yet so........

    in the piping 'instructions' for this chiller; 'if the overhead run is more than 90' from the chiller', they want a reverse 'trap' built into the run. ie, 90' horizontal run, then 12" up, 12" horiz, and 12" down to the continuation of the original run. and in the middle of the 12" horiz, a vacuum breaker. HUH?! am i missing something?
  • closed

    the customer showed me what he had, so unless there was a missing page/section from the manual........but, i think he spoke with the manufacturer about it after i questioned it possibly being an air purge. maybe it wasn't clarified between them whether it was a closed or open system

    he's our 'customer' but they decided to do their own re-installation, and from what i've seen so far,(an 8" section of #40 pvc PAINTED with purple primer, including the ball valve) i have a feeling we'll be called in to re-do it
  • Wayco Wayne_2
    Wayco Wayne_2 Member Posts: 2,479
    I've been looking

    into using chilled water in some near future. If you find a resource on how to pipe it please share. Can you run it in PVC? Is there no oxygen barrier issues? I wish I knew more?

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  • Matt_30
    Matt_30 Member Posts: 16


    The same rules for other hydronics still apply. The chiller manufacturer would be a good resource for info. I suspect the idea behind the trap and vacuum breaker is in case of loss of pressure. I'd be careful about where the vacuum breaker is placed as they can and will leak eventually.
  • bob young
    bob young Member Posts: 2,177
    piping

    it usually makes sense to follow the manufacturers piping diagrams unless they contradict any codes or regulations. if there are grey areas confer with engineering dept.
  • ww

    no problem with pvc, and the typical spec that i've seen in the installation manuals, or the comm/ind facilities that we do work for, is that it's sch80
  • Tom_80
    Tom_80 Member Posts: 22
    chiller piping

    Is this a package process chiller? Make? Model?
    Usually the manufacturer recommends this to keep the water up in the horizontal mains. There should be a checkvalve on the pump discharge. The inverted trap s/b in the return line right before the drop back down to chiller. When the pump shuts off only the leg down to the chiller drains when the vacuum breaker opens. This also keeps the pipes from moving everytime the pump starts.
  • yep, a package,

    but i don't have the make/model on hand, but i may be able to get them tomorrow

    "only the leg down to the chiller drains"
    drains to where? it's a closed system/no sump. unless i'm not remembering a 'receiver'
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