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Paneltrol mixing valve

gclark
gclark Member Posts: 3
in A-C, Heat Pumps & Refrigeration

can a paneltrol mixing valve cause the piping to shake, rattle on the circuit that it’s on? I have a customer that has a hot water boiler set to 140 degrees, and after about 5-10 minutes of run time the circuit it’s on starts rattling the piping, the only way I can get it to stop is to partially close the return shutoff valve back at the boiler for that circuit.

Comments

  • HVACNUT
    HVACNUT Member Posts: 7,086

    By throttling the return, its forcing more to the cold on the mixing valve. The boiler is set to 140°, or the mix is set to 140°? Is the temperature at the mix correct after 5-10 minutes when things start shaking?

  • gclark
    gclark Member Posts: 3

    The boiler is set to 140. I will have to check the temp at the mixing valve, I did not check it when there, I will be returning next week to make other repairs and I will check mixing valve temps. I am not sure what the mixing valve temp is suppose to be, the tag on the adjustment screw is corroded up and is not readable.

  • hot_rod
    hot_rod Member Posts: 25,934

    what type of boiler? 140 could be pretty low to run a conventional boiler, you may experience some condensation if the return is below 130?

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • gclark
    gclark Member Posts: 3

    It's a Weil mclain hot water boiler. As far as I know its always been set at 140, I just worked on this last week so I'm not sure of the history.

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