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Help with humming, very long run / high head

dwright1542dwright1542 Member Posts: 3
edited November 20 in THE MAIN WALL
We have an unusual setup that was put in in the 50's/60's. It's a third floor baseboard, one continuous loop all the way around, about 250 feet, with LOTS of turns, and about 1750sq feet, in Delaware, so 61000BTU's give or take. It's also 30ft of rise, plus another 80 feet of pipe (40 each way) from the boiler, so total loop is 375ish feet, 3/4in copper. The pump is a Taco 009-F5.

The problem is: The rooms above the boiler and pumps, which is in a wing of the house, hums something awful. I mean AWFUL. House is from 1855, so no insulation. System bleeds fine, no apparent air in any of the 3 circulators on that boiler.

I've had multiple people look at it and noone has had any GOOD suggestions. Anyone have a recommendation of someone REALLY good at hydronic systems in Philly / Delaware?





Comments

  • Jamie HallJamie Hall Member Posts: 13,852
    Can you identify, exactly, which piece of equipment -- pumps, fans, what have you -- is generating the hum? It may not be just one item, sadly.

    Usually that sort of telegraphing hum comes from the metal pipe being in solid contact with a beam or the floor or walls, and taking the hum from a piece of equipment and driving it into the structure. Often the only solution is to make sure that all the pipes are isolated from the structure with resilient pads.
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,538
    What @Jamie Hall said is the first thing to check. Shut the pump off and see if the humming stops. You need to find out what device is causing the noise. Pipe could be rubbing on something and check things out like Jamie said.

    It could be high velocity. If you have a valve on the discharge side of the pump try throtteling the valve temporally and see if the noise changes
  • IronmanIronman Member Posts: 5,922
    It's probably the Taco 009. Some of the older ones would do it worse than others.

    That's a high head pump and as Ed mentioned, if the velocity is too high, that could be the issue.

    A 375' loop of 3/4" is rediculous and the high head pump was probably added to compensate for it.

    I'd try using a Grundfos ups26-99 starting on low speed and see how it does. It's a high capacity pump with less noise.
    Bob Boan


    You can choose to do what you want, but you cannot choose the consequences.
    rick in AlaskaZman
  • dwright1542dwright1542 Member Posts: 3
    edited November 20
    It's definitely when the Taco is on. We're fully hydronic, and the pipes don't run in the wall in that portion of the house. they're suspended from the basement ceiling with plastic pipe strap. There are 2 other loops on that same boiler that don't hum.

    Yeah I'm handy but no heating guy and I knew that loop was probably not the best idea. I'm not sure how else they would have added it though. I'll lookup the other pump, thanks!
  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,538
    @dwright1542
    The real fix is probably to split the loop. Run a 1" supply to the halfway point and tie into the baseboard. Then take the one that is the supply now and connect it to the return on the boiler
    Zman
  • dwright1542dwright1542 Member Posts: 3

    @dwright1542
    The real fix is probably to split the loop. Run a 1" supply to the halfway point and tie into the baseboard. Then take the one that is the supply now and connect it to the return on the boiler

    I wish that were possible. The current loop is on the 3rd floor, inside small kneewalls. It's physically impossible without massive surgery. I'd probably consider putting some kind of mini boiler on the 3rd floor, getting rid of the extra length, and just running a gas line up the chase.
  • Solid_Fuel_ManSolid_Fuel_Man Member Posts: 2,125
    How many feet of baseboard is on the loop? Total run of 375' if 3/4 copper isnt out of and ordinary 0015e range or Alpha 1. Is it all heating well, just a noise issue?
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
  • Solid_Fuel_ManSolid_Fuel_Man Member Posts: 2,125
    Plus its absolutely best practice to have a high head pump on the supply pumping toward the loop, and away from the expansion tank. 
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!

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