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  1. 03-31-2009, 05:28 PM #1
    bobby m
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    JCI / AX temp issues

    I have a jci branded ax jace with about 40 devices on the n2 bus and some of the vma's for the fan powered boxes get wild readings on the space temps (109 deg. etc.) when the room is 70 deg. and they return to normal on there own, any ideas ?
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  2. 03-31-2009, 06:21 PM #2
    Cagey57
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    Which model ? If it's an FX-20 you have bigger problems than you think. If it's an FX-40 or 60 you're o.k.

    Try looking at the VMA's via HVAC-Pro (either via T-stat or direct on N2 bus, disconnect the FX first) and look for the COS values on the AI's, specifically Zone Temp, Remote Setpoint/Adjust and the Velocity input. If they are less than 1.0 change them to 1.0 or more. If that doesn't help try reducing your individual point count for each VMA to less than 12.

    If you're working with a 20 JC recommends total devices less than 35, total points less than 350. My only suggestion would be to drop the point count on each VMA to absolute minimum (6 each is about as low as you dare go) and cross your fingers. Only other option is to replace with a 40 or 60 (60 prefered).

    good luck if it's a 20 !
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  3. 03-31-2009, 07:02 PM #3
    freddy-b
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    Quote Originally Posted by bobby m View Post
    I have a jci branded ax jace with about 40 devices on the n2 bus and some of the vma's for the fan powered boxes get wild readings on the space temps (109 deg. etc.) when the room is 70 deg. and they return to normal on there own, any ideas ?
    Make sure the VMA's are downloaded with HvacPro 8.08b code. And you have the latest n2.jar for the workbench revision you use in the Jace.
    That should take care of the flaky VMA stuff.
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  4. 03-31-2009, 11:32 PM #4
    Cagey57
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    Quote Originally Posted by freddy-b View Post
    Make sure the VMA's are downloaded with HvacPro 8.08b code. And you have the latest n2.jar for the workbench revision you use in the Jace.
    That should take care of the flaky VMA stuff.
    Yea, What he said, we have had so many problems with VMA's on the FX's that I fogot about the patch files. Try that first.

    Thanks Freddy-b for the reminder.
    If sense were so common everyone would have it !

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  5. 04-01-2009, 04:08 PM #5
    bobby m
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    I went back today,hvac pro = 8.08, and i changed the cov setting from.5 to 1.0 on a couple boxes and they worked normal,but the problem may have been that the stat/n2 wires were run across the trigger board for the heat scr's, i'll post the results later
    Thanks
    By the way do i have to have workbench software to tell what jar file the n2 is ? i'm working from the embedded software in the fx40.
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  6. 04-01-2009, 06:55 PM #6
    Cagey57
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    I went diggin in a Rev 2.0 via the browser. I can't figure out a way to see them. I am afraid you do need FX-Workbench. Freddy-b may have more info but I can't ever remember being able to get to the *.jar file without WB.
    If sense were so common everyone would have it !

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  7. 04-01-2009, 07:39 PM #7
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    NINAX
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    Quote Originally Posted by bobby m View Post
    By the way do i have to have workbench software to tell what jar file the n2 is ? i'm working from the embedded software in the fx40.
    Try "http://YourStationIP/ord?spy:/sysManagers/moduleManager"
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  8. 04-02-2009, 06:19 PM #8
    bobby m
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    Thanks i'll post the results later.
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