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  1. #1
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    Advice/help required for a "change over " system In a Comms room



    Hi all, I am trying to come up with some sort of "change over" unit for a Comms room.

    I have two seperate wall mount mitsubishi split systems both serving the same small area. There is only a need to run 1 unit at one time to cool the area, the second just there for back up (critical Comms equipment). Idealy I want to alternate them on a weekly basis, and have the second come in when the temp rises above the set point in high temperatures or if the current unit goes into fault.

    I am aware the par 31 is capable of managing this, but these units are 8 years old and the software is not compatable.

    I think mitsu supply a stand alone panel that will do all this and more, but it's very expensive. So I'm hoping there is an alternate solution.



  2. #2
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    Re: Advice/help required for a "change over " system In a Comms room

    stick a room stat to switch the live s1 to indoor if temp reaches above 23 deg so you have a run/stand by-but 1 unit would run constantly

  3. #3
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    Re: Advice/help required for a "change over " system In a Comms room

    As per IM, and add one of those relays that is powered both ways and a 7 day time clock to switch lead lag arrangement.

  4. #4
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    Re: Advice/help required for a "change over " system In a Comms room

    We use the Mitsi Procon RS panel and A1M interfaces to do this, but like you say it's an expensive way of doing it.

  5. #5
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    Re: Advice/help required for a "change over " system In a Comms room


  6. #6
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    Re: Advice/help required for a "change over " system In a Comms room

    Quote Originally Posted by r.bartlett View Post
    Good post RB Thanks I have saved them for future reference.
    Grizzly

  7. #7
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    Re: Advice/help required for a "change over " system In a Comms room

    Quote Originally Posted by r.bartlett View Post
    What sort of price are these compared to a Procon?

  8. #8
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    Re: Advice/help required for a "change over " system In a Comms room

    you want me to wipe your a*se as well?

  9. #9
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    Re: Advice/help required for a "change over " system In a Comms room

    can I ask question about refrigerator?

  10. #10
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    Re: Advice/help required for a "change over " system In a Comms room

    Quote Originally Posted by fred View Post
    can I ask question about refrigerator?
    I wouldn't, r.bartlett might have a hissy fit again

  11. #11
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    Re: Advice/help required for a "change over " system In a Comms room

    I looked at something similar to these where a company will build a panel to suit
    your requirements, but it worked out similar costs to the pro con rsns

    Good pieces of kit tho if the customer is willing to pay

  12. #12
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    Re: Advice/help required for a "change over " system In a Comms room

    Quote Originally Posted by install monkey View Post
    stick a room stat to switch the live s1 to indoor if temp reaches above 23 deg so you have a run/stand by-but 1 unit would run constantly
    Thanks for your input, isnt S1 the Comms to the outdoor?

  13. #13
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    Re: Advice/help required for a "change over " system In a Comms room

    S1 live, S2 neutral, S3 is comms. Switching S1 will cut power to the indoor unit, causing it to switch off.

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