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Thread: Bmtx pcm Trane

  1. #1
    Join Date
    Aug 2006
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    Bmtx pcm Trane

    I have a system installed in 1999 that has pcms and a two year old bcu that I believe is a bmtx model. Occasionally when the bcu puts the air handlers into an unoccupied mode via schedule the pcms do not receive the control. This also has happened when the heating system shuts down and the vavs go to a reheat lockout mode. Has anyone seen this happen before? Is this due to the difference in generations of controllers that "should" work together? If I pull up the edit screen for a pcm it usually solves the problem after a couple of minutes. Cycling the power of the bcu does not solve the problem.

  2. #2
    Join Date
    Aug 2011
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    try a database and clear,ram reset.

  3. #3
    Join Date
    Feb 2005
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    Couple of thoughts -

    First, the BCU should not control the AHU via a schedule if it has VAVs. It should be using the VAS application - schedule>area>vavs>vas>ahu. If the AHU is not looking at the occupancy of the VAVs, I would suggest changing the programming. There maybe a mixed programming between area, vas, and schedule.

    Also, is the BCU changing the mode of the PCM or is there a BOP it is referenced to?
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