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Thread: Worth Sharing - AC or DC solenoids?

  1. #1
    Join Date
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    Worth Sharing - AC or DC solenoids?

    Just saw this in the classifieds and thought it was worth sharing as a warning to those who order replacement parts...
    " Someone was not thinking properly and ordered our solenoids in DC instead of AC. Our plumber installed them into the glycol lines and then the electrician discovered the mess up. Large flow, two-way solenoid valve for glycol system in 24 V. DC For 24 V. W/VA = 4 W and AMP = 0.17."

    Admin

  2. #2
    Join Date
    Feb 2012
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    Chicago, IL
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    Quote Originally Posted by admin View Post
    Just saw this in the classifieds and thought it was worth sharing as a warning to those who order replacement parts...
    " Someone was not thinking properly and ordered our solenoids in DC instead of AC. Our plumber installed them into the glycol lines and then the electrician discovered the mess up. Large flow, two-way solenoid valve for glycol system in 24 V. DC For 24 V. W/VA = 4 W and AMP = 0.17."

    Admin
    Something to keep in mind for those actually wanting to install AC solenoids. Make sure your temperature sensor wire is shielded with the shield grounded if it runs anywhere close to the solenoid's power. The AC current will cause interference with the temperature readout.

  3. #3
    Join Date
    Aug 2010
    Location
    Enterprise, Oregon
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    1,967
    It's also worth noting that you can use an AC solenoid in a DC circuit, but not visa-versa.

    Our Asco Red Hats can be converted with a rebuild kit. You need to be sure you are using an AC rebuild kit if you have an AC control circuit.
    Timm Turrentine

    Brewerywright,
    Terminal Gravity Brewing,
    Enterprise. Oregon.

  4. #4
    Join Date
    Nov 2009
    Location
    Moab, Utah
    Posts
    585

    This depends....

    Quote Originally Posted by TGTimm View Post
    It's also worth noting that you can use an AC solenoid in a DC circuit, but not visa-versa.

    Our Asco Red Hats can be converted with a rebuild kit. You need to be sure you are using an AC rebuild kit if you have an AC control circuit.
    This is an interesting note Timm, but I have never seen it work at 24VDC with the low current thrown out by some control panels. In this case it takes a relay bank to switch 24 AC at the correct VA to do the job. While this is an extra link in the chain they are very reliable if set up correctly.

    Also Red Hat solenoids are my least favorite due to the horrible design on the coil retaining mechanism on most series. That ridiculous thin metal piece that is " supposed " to lock the coil onto the valve body is an old school " Engineering Blunder " of the greatest order. Well made valve bodies have a nut that holds the coil on. The only thing worse is the new generation of DIN connectors which are again " Bad Engineering " at its all time worst. We live in an age where everything has been monetized and sub human types sit around board room tables all day trying to figure out the next corner that can be cut to put more dollars in their pocket. There are alternatives to red hat that you do not have to fight back together.

    https://www.ecmweb.com/content/using-ac-coils-dc-power

    Al the best.
    Last edited by Starcat; 08-29-2019 at 08:56 AM.
    Warren Turner
    Industrial Engineering Technician
    HVACR-Electrical Systems Specialist
    Moab Brewery
    " No Cell Phone Zone."

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