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  1. #1
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    Trane rtac200 2006 alarm issues

    I'm having issues with a rtac200 closing the alarm relays #1 and #2 for a "low chilled water temp: unit off" in the colder nights. The temp will typically be around 36 and 38* ENT/leaving when I arrive in the am and will show the alarm which is auto reset. I have changed the alarm options to latching alarms only which has taken care of the problem but there is no way to have a circuit specific latching alarm relay. So I have no way on the front end to know if either circuit is in alarm or both. I do have glycol in the system and pump control set above my freeze point for protection. The configuration in the chiller for evap is "with freeze protection". Also i will get alarm for evap water flow overdue as the chiller wants to control the pump but the bms is and sometimes a low evap temp unit off.

  2. #2
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    What are you trying to do have it not generate the low water temp alarm?

    Sent from my SM-G930V using Tapatalk

  3. #3
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    Nov 2011
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    What is your question?

    Sent from my SM-G950U using Tapatalk
    Life's tough, it's even tougher if your stupid

  4. #4
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    Jun 2010
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    Let the chiller control the pump. Problem solved!


    Sent from my iPhone using Tapatalk

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  6. #5
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    Quote Originally Posted by cperk View Post
    Let the chiller control the pump. Problem solved!


    Sent from my iPhone using Tapatalk
    Im sure it says that somewhere in the IOM .........
    OH yeah what was I thinking ......thats the thing that no one ever reads
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
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  8. #6
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    Thread Starter
    Yes. I don't want it to generate alarms anymore. I looked and couldn't find a setting for this.

  9. #7
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    Apr 2017
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    Quote Originally Posted by michael26 View Post
    Yes. I don't want it to generate alarms anymore. I looked and couldn't find a setting for this.
    There is no setting for this.

    It is generating the alarm because you are at risk for damaging the barrel. The IOM requires that the chiller control the evap pump for freeze protection. If the pump were running, I doubt you would be getting this alarm.

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  11. #8
    Join Date
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    Quote Originally Posted by michael26 View Post
    Also i will get alarm for evap water flow overdue as the chiller wants to control the pump but the bms is and sometimes a low evap temp unit off.
    And right here is the problem. The IOM specifically states that the chiller must control the pumps. There is also a sticker on the front of the chiller that stated this.

  12. #9
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    Thread Starter
    Ok. Thanks guys. That's what I was afraid of.

  13. #10
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    Feb 2017
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    I don't think there's anything that say you can't control the pump from both. Have 2 RIB relays, one labeled chiller and the other, BMS. That way, if the chiller needs to run the pump, it can. If they want to cycle it through the BMS, it can. If the BMS crashes, you can still run the chiller in local and it'll control the pump.
    Just a thought.
    -----Stop, step back, relax and have another go at it.-----

  14. #11
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    Quote Originally Posted by BennyD View Post
    I don't think there's anything that say you can't control the pump from both. Have 2 RIB relays, one labeled chiller and the other, BMS. That way, if the chiller needs to run the pump, it can. If they want to cycle it through the BMS, it can. If the BMS crashes, you can still run the chiller in local and it'll control the pump.
    Just a thought.
    That is allowed and done all the time.

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  16. #12
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    Thread Starter
    Good idea. Thank you

  17. #13
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    Aug 2009
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    Don't forget to include automatic isolation valves in the pump control, if there are any.

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