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  1. Mcells had "canned"programs for VAV control but...

    Mcells had "canned"programs for VAV control but required custom programming for other applications such as yours. The handheld tool had some value for use by balancers. Beyond calibration of VAVs the...
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    If there are multiple XL5000 controllers they are...

    If there are multiple XL5000 controllers they are almost certainly be communicating via C-Bus. If, as Keith D, has noted there are wires on both the C-Bus and Lon Ports of the XL50 communication...
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    Assuming that what you need to do is integrate a...

    Assuming that what you need to do is integrate a single existing XL50 into an existing LON network your best bet would be to pull out the XL50 and replace it with a controller you're comfortable...
  4. Excuse my soapbox...? My personal thoughts on...

    Excuse my soapbox...? My personal thoughts on Trim and Respond. No doubt it will work but you might want to consider other means.

    Example, if you want the VAV with the greatest opening to remain...
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    FIRST!! : Know your contract! The Engineer's...

    FIRST!! : Know your contract! The Engineer's plans and specifications apply only to the extent that your contract requires! Unfortunately your sales people accept have probably taken an order "per...
  6. Given a clean sheet of paper I would install...

    Given a clean sheet of paper I would install differential pressure transmitter(s) across the chiller evaporator section(s) and modulate the bypass valve to maintain something just slightly above the...
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    A little more information about the "system"...

    A little more information about the "system" would make it easier to suggest modifications. The initial post suggests that the unit is serving VAV boxes. If the application is, in fact, VAV it could...
  8. I'm not going to suggest that you not replace an...

    I'm not going to suggest that you not replace an 18 year old system but the controllers are still available for purposes of servicing your system. It's only within the past 3 or 4 years that branches...
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    Here goes, Putting aside the "legal" questions...

    Here goes,
    Putting aside the "legal" questions and the benefits of doing it the way we're all familiar with.....

    Rather than attempting to control fan speed based on nvoBoxFlow how about using...
  10. Disconnect the AO and slap a 499 Ohm resistor...

    Disconnect the AO and slap a 499 Ohm resistor across the output. If you can't get the voltage reading across the output to go from 2-10 VDC you know the issue is at the controller end. Otherwise,...
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    Unfortunately Honeywell has used the...

    Unfortunately Honeywell has used the "Comfortpoint" title for a number of different products. Do you have Comfortpoint "Open" (native Bacnet controllers) or Comfortpoint with LON controllers? The LON...
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    And the application would be?

    Do you need to detect the presence of an individual or a thing? When I think of proximity sensors I usually think of detecting a "thing". (Rotary motion of a heat wheel for example).

    If you need...
  13. This question reminds me of my wife. For example,...

    This question reminds me of my wife. For example, she will ask me if I have a nailset. Then I have to ask her why she wants to know if I have a nailset only to find out that a nailset isn't what is...
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    I've used quite a few Lantronix UDS-1100 IAP ...

    I've used quite a few Lantronix UDS-1100 IAP Device Servers to tie RS485 Modbus connections to Building Automation Systems. Note that the IAP version explicitly supports Modbus. I've never had...
  15. My thoughts:

    Skip the one temperature sensor to two AIs. Install two sensors and then calibrate them to match. The actual sensor is inexpensive and if you're running two conductors to a sensing location running...
  16. http://www.sensacloud.com/sensaphone-2000-upgrade....

    http://www.sensacloud.com/sensaphone-2000-upgrade.html
  17. Ditto to the Honeywell Gray Manual. Try to...

    Ditto to the Honeywell Gray Manual. Try to remember that what separates the adequate from the expert is NOT knowing how to program but knowing WHAT to program. It's all about the sequence of...
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    For the true geek the hours you will spend...

    For the true geek the hours you will spend watching Bacnet packets fly around will be fascinating and a great opportunity to learn, by all means do it. Before you start, however, you might want to...
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    Given that the valve looks like it's a butterfly,...

    Given that the valve looks like it's a butterfly, that Deltaacp.com redirects to Bray's website, and that the label references "standard heater" [common on Bray butterfly actuators] you might want to...
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    I confess that I'm not a big fan of building...

    I confess that I'm not a big fan of building space static pressure control but in the right application it can be made to work. A light commercial building such as a medical professional facility...
  21. If you were to Google 74-2949 you would find a...

    If you were to Google 74-2949 you would find a Honeywell W7751 Application Guide. In Appendix C there is a description of common sequences of operation.

    The good news is that based on your...
  22. Assuming you have a positive relationship with...

    Assuming you have a positive relationship with the branch office that performed the installation and that the branch has remote access to your network it should be fairly trivial to get them to...
  23. Few things to consider: Given a remote location ...

    Few things to consider:
    Given a remote location and a lack of experience with Honeywell CARE do you really want to interface to existing XL5000 controllers?
    It's very possible that with 30 RTUs...
  24. There's no trick. Triacs simply won't RELIABLY...

    There's no trick. Triacs simply won't RELIABLY switch DC voltages. It might work occasionally but there's no way it will work reliably. Perhaps you could switch 24 VAC and install a diode at the LED....
  25. XP-SP3 with a PCC-10 card is a practical solution...

    XP-SP3 with a PCC-10 card is a practical solution (no real need for VMWare). It is not supported by Honeywell but most Honeywell techs use it. But, there are some quirks. In order to "restore" a...
  26. The connector on the old style "flat cable" is...

    The connector on the old style "flat cable" is notorious for failing. Open it up and give it a close look. I always carried a spare. Perhaps the problem might provide an excuse to move to a laptop...
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    The real question is what is the L7033 connected...

    The real question is what is the L7033 connected to? These are 500 Ohm balco sensors and I doubt that you're going to find a direct replacement. The good news is that quite a few of the controllers...
  28. How are you using them? 0-10 VDC, Floating, 2...

    How are you using them? 0-10 VDC, Floating, 2 Position? I have seen similar actuators that have failed becasue the control operating them caused them to reposition every few seconds.
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    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....
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    Commercial construction is a strong possibility....

    Commercial construction is a strong possibility. Find a smallish company where you can be upfront with the boss. No major corporation is going to listen to your story and they ARE going to do a...
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    Each DDC program in a R7044 has a program error...

    Each DDC program in a R7044 has a program error point assigned to it. I believe (we're going WAY back here) that the value is a three digit integer. When a program has an issue such as a sensor...
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    Sounds good on paper...

    But I haven't seen a successful implementation in a typical commercial building. I have a couple of questions:

    If you manually operate the fans and dampers in the manner intended by the CE can you...
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