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  1. #14
    Join Date
    Feb 2017
    Location
    New York
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    1,191
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    Quote Originally Posted by Nuclrchiller View Post
    Don't forget to include automatic isolation valves in the pump control, if there are any.
    Good call. That would be bad!
    -----Stop, step back, relax and have another go at it.-----

  2. #15
    Join Date
    Apr 2018
    Posts
    31
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    When you have glycol in the system you you should also change the "leaving water temp cutout" and "low refrigerant temp cutout". You change the cutout temps based on the percentage of glycol in the system. You can find the chart in the IOM. Factory default setpoints are 36 for water cutout and 28 for refrigerant cutout. Making these changes per the glycol will stop the alarm from coming up so often being that you have protection below 32 degrees.

  3. Likes GAchillrtek liked this post
  4. #16
    Join Date
    Oct 2011
    Location
    Upstate NY
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    134
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    Quote Originally Posted by Dan0721 View Post
    When you have glycol in the system you you should also change the "leaving water temp cutout" and "low refrigerant temp cutout". You change the cutout temps based on the percentage of glycol in the system. You can find the chart in the IOM. Factory default setpoints are 36 for water cutout and 28 for refrigerant cutout. Making these changes per the glycol will stop the alarm from coming up so often being that you have protection below 32 degrees.
    THIS^^^^

    If the chilled liquid loop has the sufficient glycol concentration for the lowest expected OA temps, the need to start the pump for freeze protection purposes becomes moot.

    As per the manual, adjust the "low chilled water temp cutout" 5* ABOVE solution freeze point and "Low ref temp cutout" 4* BELOW the freeze point.

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