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Boiler feed pump overfilling

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Looks like this has been going on for a couple years. Got called because of water on boiler room floor. The receiver is full, but the PRV is still feeding. Float problem?


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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,517
    edited March 16
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    Yes, it is on the RH end of the tank. There is a float inside like a toilet tank float. See what the water pressure is on the supply side of the float. I think 30 psi is max.

    If the boiler pump is constantly cycling (like every 30 seconds) then you have a bad check valve between the boiler and the pump. If it doesn't get fixed you will kill the boiler.
  • Pumpguy
    Pumpguy Member Posts: 655
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    What is make up water supply pressure? Generally, mechanical float valves are not recommended when supply pressure exceeds 50 PSI.

    What is regulated supply pressure downstream of PRV?

    A better make up water arrangement is a float switch and solenoid valve.

    Typically this is the preferred arrangement.
    Dennis Pataki. Former Service Manager and Heating Pump Product Manager for Nash Engineering Company. Phone: 1-888 853 9963
    Website: www.nashjenningspumps.com

    The first step in solving any problem is TO IDENTIFY THE PROBLEM.
  • targetman74
    targetman74 Member Posts: 6
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    The PRV is 25-75 range. Someone wrote set to 20 PSI. First laid eyes on this yesterday. Thinking how could I add solenoid valve.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,517
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    @targetman

    Take the original float out and install one with a switch. Wire the switch to the solenoid. Move the MU water to a different tapping. Put a tee in the vent line to add the water if you have to

    Looks like a Shipco Tank? Call the local Shipco rep and they can hook you up