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  1. #1
    Join Date
    Dec 2006
    Location
    Boston area
    Posts
    213

    Carrier RTU-Open Problem

    Just installed 45 new RTU's that have factory install RTU_Open controllers in them. The issue I have is on some units the unit will go into Economizer Cooling mode even though the Space temp is 5 degrees below the cooling set point. I have to raise up the cooling set point 5 degrees above space temp to get it to come out of Economizer Cooling mode. When I try to open the control program in either Application Builder or SNAP it says that program was not made with either application. Have had my Carrier controls support guy looking into it, he has seen the same problem on other RTU's, but thought I'd see if anyone else has ran into this.

  2. #2
    Join Date
    Jul 2006
    Location
    Southern California
    Posts
    223
    Which version module driver did your RTU's have in them? ( you can do a modstat and post the screen capture here)

    The program for the RTU's can not be opened or edited with i-Vu SNAP, as it is locked from field editing due to warranty and liability issues related to the "factory provided controls" sequences of operations. I work with configuring and troubleshooting RTU opens almost every day, and have not seen this issue yet. Do you have the configuration manual or training Power point for the RTU Opens?

    Chances are there is a Configuration setting that may need adjustment.

    Respectfully

    Drac

    Can you post a printout of your BACnet Points tab (use the report feature)
    "We are what we repeatedly do. Excellence, then, is not an act, but a habit" Aristotle

    Remember to "Pay it Forward"; help out the newer generation of techs, remember someone during our career helped us! ("Pay it Forward" was by someone smarter than me!!)

  3. #3
    Join Date
    Dec 2006
    Location
    Boston area
    Posts
    213
    Driver Version - drv_rtuopen_std_3-04-361#discovered
    Control Program - rtu_open-2_20120123
    This is info from database. I am not on-line with device. I think I attached point report, but again I'm not on-line with device.
    This issue is happening to a number of units. I have carrier controls tech. coming to site this week.
    It does suck that you can.t view control program in either SNAP or App. Builder
    Attached Images Attached Images

  4. #4
    Join Date
    Dec 2006
    Location
    Boston area
    Posts
    213
    Found out today that the way the economizer is set up in the RTU Open is that it tries to maintain a mid-point between Heat and Cool set points, if your Cool setpoint is 72 and your heat setpoint is 68 the economizer is looking to maintain 70. Doesn't make sense to me or my customer.

  5. #5
    Join Date
    Apr 2007
    Location
    Amarillo by mornin'
    Posts
    850
    Mechmike2,

    If you want you can send me the .clipping or the program and driver and I can see if I can open it and see what is going on, maybe even modify it. I have been lucky so far, as I have been able to open some OEMCtrl clippings here lately.
    "It's not that I'm smart, it's that I stay with the problem longer”
    Albert Einstein

  6. #6
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,667
    Lucky huh? Lol


    Quote Originally Posted by xarralu View Post
    Mechmike2,

    If you want you can send me the .clipping or the program and driver and I can see if I can open it and see what is going on, maybe even modify it. I have been lucky so far, as I have been able to open some OEMCtrl clippings here lately.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  7. #7
    Join Date
    Apr 2007
    Location
    Amarillo by mornin'
    Posts
    850
    Yea luck as in "opening" the program. I gave a copy of that program to our engineer, and for three (on and off) days he looked at that program and finally gave up on it. His comment was he thinks the programmer lives in a state that has legal marijuana.
    "It's not that I'm smart, it's that I stay with the problem longer”
    Albert Einstein

  8. #8
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,667
    Yeah I believe it. It's still a WIP.

    Quote Originally Posted by xarralu View Post
    Yea luck as in "opening" the program. I gave a copy of that program to our engineer, and for three (on and off) days he looked at that program and finally gave up on it. His comment was he thinks the programmer lives in a state that has legal marijuana.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  9. #9
    Join Date
    Dec 2006
    Location
    Boston area
    Posts
    213
    The units in question are all brand new and I wouldn't want to run into warranty issues. I am not sure what I would send you anyhow.

  10. #10
    Join Date
    Dec 2006
    Location
    Boston area
    Posts
    213
    Thanks though.

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