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Type: Posts; User: Ithos

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  1. Replies
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    With the heat coil before the cooling coil any...

    With the heat coil before the cooling coil any heat addition will drive the air further from the dewpoint. Not an optimal setup for humidity control. With variable speed air flow you could affect the...
  2. So the reason Siemens recommend no VFD's is that...

    So the reason Siemens recommend no VFD's is that the savings would not justify the upfront costs?

    I concur with Matrix on this matter. A true analysis would need to be custom to the particular...
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    A great introduction for the newbie. The best I...

    A great introduction for the newbie. The best I have seen so far.
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    They should be specified in the design which...

    They should be specified in the design which presumably was done by an engineering firm. But since you have already experienced a significant problem the controls contractor may need to perform...
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    In that case Reaper's suggestion is an absolute...

    In that case Reaper's suggestion is an absolute minimum imo. If there are other configurations which may lead to shut off head then further measures should be considered. Installing a diff temp...
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    I would consider temperature monitoring of the...

    I would consider temperature monitoring of the pump casings if shut off head is a concern. Flow switches are another protection option but require taps and need a time delay. Does this plant have...
  7. Thread: JC Tech Support

    by Ithos
    Replies
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    935

    When I sought advice for FX they directed to my...

    When I sought advice for FX they directed to my local ABCS. They don't like to talk directly to the end user in my experience.
  8. Thread: BacNet Question

    by Ithos
    Replies
    37
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    1,981

    I apologize. I misread your first post. I thought...

    I apologize. I misread your first post. I thought you had more than one JACE. I can not think of a good solution offhand. The Jace would have to support multiple BACnet networks and I don't think...
  9. Thread: BacNet Question

    by Ithos
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    37
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    1,981

    I don't think there is a solution that lets the...

    I don't think there is a solution that lets the mstp trunk remain a part of your Bacnet network as long as there are device ID's in conflict. You can disable the Jace as a bacnet router and then...
  10. Thread: VFD Myth or Fact

    by Ithos
    Replies
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    1,856

    By running in bypass you reduce the chance that a...

    By running in bypass you reduce the chance that a catastrophic motor failure will damage the drive but those are pretty rare events. Perhaps it makes sense if connected to an unstable grid and you...
  11. Thread: BacNet Question

    by Ithos
    Replies
    37
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    1,981

    I'm pretty sure that the FXVMA's device ID...

    I'm pretty sure that the FXVMA's device ID defaults to the Mac Address. Ran into this issue on a college campus. It was a major oversight by JCI. Should be easy enough to confirm with your sales rep....
  12. Thread: BacNet Question

    by Ithos
    Replies
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    1,981

    Thanks for the info. Don't know of any in the...

    Thanks for the info. Don't know of any in the Southeast. It may be a steep learning curve if they do. Lots of business for the institute.
  13. Thread: BacNet Question

    by Ithos
    Replies
    37
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    1,981

    So does this mean that some of the JCI Branches...

    So does this mean that some of the JCI Branches are starting to install Jace's? Last year my JCI instructor said they were planning on doing that.
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    Making pop corn. This is about to get...

    Making pop corn. This is about to get interesting.




    Hillarious! Wish there was a like button.
  15. Very informative discussion. I found this HP...

    Very informative discussion. I found this HP take on the latest ASHRAE recommendations http://h20000.www2.hp.com/bc/docs/support/SupportManual/c03499263/c03499263.pdf

    After reviewing a few...
  16. Thread: ASI Integration

    by Ithos
    Replies
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    622

    They are BACports which were connected by...

    They are BACports which were connected by ethernet cable to Jace. The adapters show up as BACnet IP devices. The mapped in controllers show up as MSTP/Other devices on a network number you assign...
  17. Highly recommend this book....

    Highly recommend this book. http://www.amazon.com/Building-Automation-Integration-Open-Protocols/dp/0826920128
    Written for the NJATC (IBEW apprenticeship program) and Cisco Networking guide....
  18. Thanks MT. It's always best to refer to a...

    Thanks MT. It's always best to refer to a psychrometric chart. I should have been more precise. There is a good section in the Honeywell Manual too.
    From 3-4(Sensible Heat) the humidity ratio is...
  19. Thread: ASI Integration

    by Ithos
    Replies
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    622

    Thanks Joey for your reply. Please excuse my...

    Thanks Joey for your reply. Please excuse my ignorance about OPC but does the Jace require an OPC client driver? I found literature on one but it said it had to be windows based. I presume that the...
  20. Obviously you need to keep the temps low to keep...

    Obviously you need to keep the temps low to keep equipment from overheating but sometimes this results in very high RH depending on ambient conditions. HVAC should also have a humidifier.
  21. "it drys the air out". How many times have i...

    "it drys the air out". How many times have i heard that? syk said it well. Relative Humidity is lowered but that is because it is a ratio.Recommended Computer Room Humidity.

    From a good source......
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    When the customer freaks out after seeing their...

    When the customer freaks out after seeing their electricity bill spike due to electric heating in summer, you know you have the deadband too small. IMO it is a case by case scenario. If you have...
  23. Thread: ASI Integration

    by Ithos
    Replies
    8
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    622

    Are there any good options for Jace integration...

    Are there any good options for Jace integration without using ASI devices like the BACPort?
  24. Thread: ASI Integration

    by Ithos
    Replies
    8
    Views
    622

    Usually there is a licensed copy of Expert on a...

    Usually there is a licensed copy of Expert on a laptop the installers leave behind. This makes life much easier especially if you want to use an ASI driver Tridium. If there is you will have an mdb...
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    They make some very good training discs that...

    They make some very good training discs that someone at your company should have or can obtain. The ones I have were made in 2003 but the fundamentals are still the same. I borrowed several from...
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