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  1. If I need to disable it, I guess I will have to...

    If I need to disable it, I guess I will have to run W from stat directly to the furnace, not through the heat pump(Wout). Am I correct?
  2. I guess I should look up some info about that...

    I guess I should look up some info about that pipe freeze protection.. Thanks a lot!
  3. jtrammel, That's what i thought, but gentleman...

    jtrammel,
    That's what i thought, but gentleman at York tech support told me that furnace fan would never turn on unless stat says so (G=on)
  4. fan in auto, system in heat. no fresh air. call...

    fan in auto, system in heat. no fresh air. call for cooling is impossible unless there's something wrong with the stat itself? I had run it through test modes and didn't notice anything wrong.
  5. Furnace turns on for no reason. York YP9C/YZF with VisionPro8000.

    Had a service call last week. Client complains that "vent would turn on every now and then at night and start cooling(?)". I came in and checked wiring and stat settings.

    He has York YP9C...
  6. I found energized shield on one of FLNs. It...

    I found energized shield on one of FLNs. It measures 14VDC to ground(O.o WTF?).
    New VFDs detect insufficient grounding/network disturbances.

    I am trying to find out if poorly wired FLN could...
  7. Replies
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    1,023

    I just came across one of those Centaurus Prime...

    I just came across one of those Centaurus Prime P1. That thing is essentially a DOS based 4-Trunk FieldBus/FLN to Bacnet-over-IP gateway. It runs a bunch of VFDs and APOGEE controllers in one of our...
  8. Spoke to building engineer today. Speed drives...

    Spoke to building engineer today. Speed drives are dead as a doornail and not subject to repair. It was caused by internal electronic failure within one of the components. Same component in all three...
  9. Well actually I didn't see it inside the drive....

    Well actually I didn't see it inside the drive. And voltage seems to be within the range (567-570V on 575V system)
  10. Faulty under-voltage relay? Is it possible to...

    Faulty under-voltage relay? Is it possible to readjust at what voltage it drops out?
  11. Thread: RTU trouble

    by ddcbacnet
    Replies
    7
    Views
    1,302

    This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
  12. This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
  13. Ok, so... Service tech from ABB came over today...

    Ok, so...
    Service tech from ABB came over today and declared 3 drives FUBAR on electronic level.

    He took one of the drives with him to run it through some tests and determine the cause.

    Now...
  14. Replies
    1
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    286

    Howdy HVAC people!

    I have come across this site quite a few times and finally decided to register. Looks like I could make a good use of it. :yes:

    I am an electrician, work as BAS(BMS) system installer in downtown...
  15. yes, there is. they are both off

    yes, there is. they are both off
  16. I believe theres no such thing as proper shut...

    I believe theres no such thing as proper shut down any more. at least not for AHUs. All speed drives now a day come with protection from over- and under-voltages, sudden power loss and shorts and...
  17. Nope, that's not fuses. But I actually like the...

    Nope, that's not fuses.
    But I actually like the re flashing idea...
    We have our own ABB certified start-up guy, but he was like wtf?. And he doesn't have a FlashDrop tool.
    Will have to call...
  18. ABB ACH550 HVAC speed drive wouldn't turn back on.

    Hello everyone,

    after major renovation speed drives on three floors of high-rise building wouldn't turn on.

    Is there anything that I don't know? Is there a trick on how to start them after long...
  19. Done! Thaks a million !!!

    Done!
    Thaks a million !!!
  20. Wanted: TRANE: Bacnet best practices and troubleshooting guide pdf

    There was a pdf one time available at

    http://www.trane.com/webcache/es/building%20automation%20systems%20%28bas%29/service/bas-svx51a-en_11112011.pdf

    It was called "TRANE: Bacnet best practices...
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