staefa ms 2000 comm problems
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  1. #1
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    Aug 2011
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    staefa ms 2000 comm problems

    i am new to a large office building that is vacant. The new owners fired the maintenance guy that was here. Any way i have a staefa ms 2000 system with a lot of vav comm failures. I have a tool on loan. can any body tell me how to start troubleshooting them.

    thank you

  2. #2
    Chris_Worthington's Avatar
    Chris_Worthington is offline Controls Committee & Global Moderator
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    Thread relocated to the controls forum

  3. #3
    Join Date
    Aug 2011
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    Denver PA
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    Wink

    Quote Originally Posted by Arctic2008 View Post
    i am new to a large office building that is vacant. The new owners fired the maintenance guy that was here. Any way i have a staefa ms 2000 system with a lot of vav comm failures. I have a tool on loan. can any body tell me how to start troubleshooting them.

    thank you
    One thing u can do is turn off all of the vav cards and restart them. Sometimes the cards will lockup and become what we call screamers and cause comm issues. This can cause other cards on the system to act up. Check your trunk voltage should vary from 1.5 vdc to 5 vdc. If trunk voltage is low try to find middle of trunk and separate trunk and take readings. Keep eliminating cards until u get normal trunk readings.

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