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Adjusting Heat Exchanger Pump

c.t.kay
c.t.kay Member Posts: 85
in THE MAIN WALL
open the valve all the way ,put a balancing valve on the return. call Istec corp. ask them for a flowgaurd balancing valve. www.istec-corp.com

Comments

  • Joe Budge
    Joe Budge Member Posts: 1
    Adjusting Heat Exchanger Pump

    I'm a homeowner with a relatively new hydronic circuit running off my steam boiler's condensate via a heat exchanger. Turns out the installer left out a few controls so I'm groping through Dan's books (a big "Thank You!") to figure out what's going on. Here's the immediate poser:

    The circulator pump which draws water out of the boiler is cavitating at high water temperatures (above 185 degrees or so). Sounds like bubbles going through the pump, the sound goes away as the temperature drops. Actually, I think the cavitation might be starting at the ball valve where the flow leaves the boiler as the installer left this valve partially closed "so that it wouldn't pump too fast". Hard to tell as the ball valve is only about 6 inches upstream from the pump.

    After reading "How Come?" it seems obvious to me that the valve at the boiler outlet should be wide open. There's no control valve on this circuit, so my plan for this season is to partially close the valve on the boiler inlet side. I'll get a control valve put in when the weather warms up and the boiler cools down. Question: How do I tell just how much to close down this valve? What's too much and what's too little?

    Thanks,
    Joe

    PS: It's a TACO 006-BT4 pump
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