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Thread: Temp setpoints for glycol chiller-range?

  1. #1
    Join Date
    Apr 2019
    Location
    Ennis, MT
    Posts
    1

    Temp setpoints for glycol chiller-range?

    Setting up a new ProChiller Chilstar and wondering about the acceptable range of glycol temps. I’m programming the temps with a Johnson A421. We have been advised to run the glycol at 27deg. The controller was set to turn “off” at 27 and “on” at 28, meaning the condenser and pump were cycling on/off frequently or constantly running. Have experimented with setting the “on” temp at 30deg to get the pump from cycling quite so often, but I’m unsure what is an acceptable range for my two setpoints. Any guidance?

    Also, the pipe insulation is planned to be installed today and I assume that will go a long way toward keeping the glycol temps at a better constant. Please advise, and thanks!

  2. #2
    Join Date
    Jul 2005
    Location
    Auburn, WA / Winston Salem, NC
    Posts
    277
    You are on the right track and will just need to play with the settings to find the settings that work best for your applications. I think setting the unit to come on at 30 and off at 27 F is a good place to start.

    You can also reach out to our tech support team via email at techsupport@prorefrigeration.com or by calling in at 800-845-7781, the technicians will also provide assistance.

    Good Luck,

    Jim

    Jim VanderGiessen
    Pro Refrigeration, Inc
    www.prochiller.com
    jim@prorefrigeration.com

  3. #3
    Join Date
    Aug 2010
    Location
    Enterprise, Oregon
    Posts
    1,955
    A larger cold glycol reservoir will also help prevent short-cycling.

    A Johnson A421 is not a very good choice for fermenter temp control. It's crude, at best. You should be using PID controllers, with platinum RTD probes in your tanks.

    I use the Johnson controllers for lots of things around the brewery where approximate temperature control is OK. Our ferms and brights all run off Fuji PID units.
    Timm Turrentine

    Brewerywright,
    Terminal Gravity Brewing,
    Enterprise. Oregon.

  4. #4
    Join Date
    Jun 2010
    Posts
    340
    Quote Originally Posted by TGTimm View Post
    A larger cold glycol reservoir will also help prevent short-cycling.

    A Johnson A421 is not a very good choice for fermenter temp control. It's crude, at best. You should be using PID controllers, with platinum RTD probes in your tanks.

    I use the Johnson controllers for lots of things around the brewery where approximate temperature control is OK. Our ferms and brights all run off Fuji PID units.
    Johnson controller is on Glycol unit

  5. #5
    Join Date
    Aug 2010
    Location
    Enterprise, Oregon
    Posts
    1,955
    Cool. I think I figured that out after I wrote the reply.
    Timm Turrentine

    Brewerywright,
    Terminal Gravity Brewing,
    Enterprise. Oregon.

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