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  1. Replies
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    http://i3.kym-cdn.com/entries/icons/original/000/0...

    http://i3.kym-cdn.com/entries/icons/original/000/001/376/ThreadNecro.gif
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    A proper VFD rated motor will have a grounding...

    A proper VFD rated motor will have a grounding ring on the shaft that shunts eddy currents to ground instead of going through the bearings to get there.
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    I've seen worse - I've seen shipyard workers hang...

    I've seen worse - I've seen shipyard workers hang tie a ladder over the side of a ship, climb down it carrying another ladder and tie it to the bottom, then do it again. This is to a ship in drydock.
  4. It looks like you do have aux heat, but to make...

    It looks like you do have aux heat, but to make sure it's properly configured, you probably ought to have a pro come out. Having two different heat sources would take some setup to make sure it uses...
  5. To be fair, the same basic method would be used...

    To be fair, the same basic method would be used if it was a 0-200psi to 4-20mA transmitter.
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    I have looked at DGLux, and I really want to...

    I have looked at DGLux, and I really want to implement it at my site. The decision of back end to run it on is tough though. I much prefer to run it on more robust hardware than a Jace, as I'm...
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    I really like pneumatics, especially for damper...

    I really like pneumatics, especially for damper or large valve controls. Spring return electric actuators don't typically have the operating strength of a typical pneumatic actuator. In many cases,...
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    The alarm management in Envision is one of the...

    The alarm management in Envision is one of the worst systems I've seen on the market.
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    unfortunately, I think the only way to do so is...

    unfortunately, I think the only way to do so is to make a separate binary point for your alarm condition in the logic, and then set an state change alarm on that point.
  10. And bacnet would still be a valid way of putting...

    And bacnet would still be a valid way of putting this information in there. As said, though, off-the-shelf is not going to be something you are likely to find. A very simple 'set this value'...
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    New drives can handle switching OFF the load...

    New drives can handle switching OFF the load without problem. Our fanwall air handlers have up to 12 motors on a single VFD, each with it's own overload. one of the overloads opening isn't even...
  12. I doubt you'll find much in a commercially...

    I doubt you'll find much in a commercially available product. I'm not sure the market demand is there for that. To understand your request, you are looking to adjust indoor temperature setpoint...
  13. Thread: BBMD vs VPN

    by CraziFuzzy
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    3,359

    Would have to get a lot more info than this to...

    Would have to get a lot more info than this to have any idea what you are dealing with. Are the 198... and 10... connected together in any way? Are the different schools already networked together...
  14. Thread: BBMD vs VPN

    by CraziFuzzy
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    3,359

    I'm not dealing with NAT here, as my VPN's are...

    I'm not dealing with NAT here, as my VPN's are running across a corporate network. If the OpenVPN server is behind a NAT/firewall from your client, then yes, it will have to have path from the...
  15. Thread: BBMD vs VPN

    by CraziFuzzy
    Replies
    43
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    3,359

    In reality, BBMD's were only ever designed to be...

    In reality, BBMD's were only ever designed to be a workaround for spreading broadcast dependent bacnet devices across a non-broadcast capable network. Simply putting all devices on a broadcast...
  16. Thread: BBMD vs VPN

    by CraziFuzzy
    Replies
    43
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    3,359

    We already had 'consumer grade' routers...

    We already had 'consumer grade' routers (cisco/linksys e2500) throughout the system for the various areas, using them as NAT gateways between 3 or 4 BacNet/IP devices in a building, and the corporate...
  17. Thread: BBMD vs VPN

    by CraziFuzzy
    Replies
    43
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    3,359

    Just started the process of moving more of my...

    Just started the process of moving more of my remote buildings over to VPN instead of BBMD. I have seen a noticeable increase in responsiveness from each building that gets moved to a VPN. This is...
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    If you are even close to entertaining the idea of...

    If you are even close to entertaining the idea of a new unit, it would be an opportune time to asses the house as a whole. There is a very good likely hood that the existing unit is actually two...
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    Outsourcing or not, Home Depot still needs to be...

    Outsourcing or not, Home Depot still needs to be informed of your bad experience. They DO choose who they deal with, and have to know about the experiences customers have with their partners.
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    Understanding that the OP is in florida, I would...

    Understanding that the OP is in florida, I would agree with that. however, in drier climates, 2-stage can be great, even with large spread out homes, but ideally only the compressor stages down. ...
  21. Did you ever try a respirator to see if the...

    Did you ever try a respirator to see if the headaches go away with it? Usually, inhaled contaminants do not cause rapid response headaches like you describe, but building pressure imbalances could,...
  22. Air leaks are rarely widespread. The air isn't...

    Air leaks are rarely widespread. The air isn't passing through the solid brick. That's the point of the testing, to locate the actual leak location, so it can be fixed there.
  23. I brought it up because if you had one done PRIOR...

    I brought it up because if you had one done PRIOR to all this, you likely could have gone about this smarter from the onset. There were reasons why so many were skeptical of you duct caused...
  24. You are upset, and I understand this - but this...

    You are upset, and I understand this - but this is not a fault of 'mini-splits'. It is the fault of a poorly designed system. As far as I can tell:
    - You had these installed as a knee-jerk...
  25. Those numbers back up what's been saying here.....

    Those numbers back up what's been saying here.. Your problem is high infiltration. Once moisture is removed from the space by the dehumidifier, it seems to come back quickly. There has to be a...
  26. That would likely increase flow, but you'd have...

    That would likely increase flow, but you'd have to verify that the existing duct IS too small. ideally, by measuring the pressure drop over the length of the duct. The other 'problem' with doing as...
  27. If you are keeping your home at 70F, that is the...

    If you are keeping your home at 70F, that is the source of your floor boards warping. As teddy bear mentioned previously, cooling the house to less than the outdoor dewpoint is risky. This causes...
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    The thing is, that solid ice is not necessarily...

    The thing is, that solid ice is not necessarily 32°F. It could be -40°F for all you know. Only when you have ice and water in equilibrium, at sea level, are you ensured of it being 32°F. It is a...
  29. The point he was trying to make, is that a damper...

    The point he was trying to make, is that a damper closed down in one trunk is not a practical way to increase flow through an undersized duct. The pressure drop over a length increases expontially...
  30. I tried.

    I tried.
  31. If you have localized high humidities, you have...

    If you have localized high humidities, you have far too much infiltration for any system to deal with. If the house was in any way sealed up, the levels would even out throughout the home, and the...
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    Clamping on a solid ice cube won't transfer heat...

    Clamping on a solid ice cube won't transfer heat well. This is why you calibrate to a ice bath. That is so you KNOW the robe is submerged in 32F.
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    'calibration' is a complete science on its own. ...

    'calibration' is a complete science on its own. Ultimately, it is the process of making your instrument report an indication that is accurate. This is usually done by comparing to a 'standard'.
    ...
  34. Sorry about your experience, but that is not...

    Sorry about your experience, but that is not normal or expected. There is nothing that makes a mini-split perform any different than a conventional ducted AC. If you are unsatisfied, you need to...
  35. Plenty of homes here in SoCal have the furnace in...

    Plenty of homes here in SoCal have the furnace in a closet off the hallway, with a louvered door, pulling air from the house, without a definite outside air vent. I can't speak to the current code...
  36. If you really want to calculate room by room heat...

    If you really want to calculate room by room heat loads, you can do as you describe. Then, add them together, and determine the total heat load, and more specifically, what percentage of the whole...
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    Having steam and hot air blowing on the stat is...

    Having steam and hot air blowing on the stat is going to cause the AC to run MORE, making the space colder than desired setpoint. If your house is not cooling enough now, moving the stat is not...
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    Its disconcerting that they are doing their load...

    Its disconcerting that they are doing their load calc to decide between 4 of 5 ton - instead of letting the load calc actually work to tell exactly what the load is. Going in with a preconceived...
  39. For many many years, energy prices were low...

    For many many years, energy prices were low enough that there was not enough emphasis placed on proper building science. This resulted in most of the trade working off thumb rules, because they got...
  40. like bear said, without being there, we can't...

    like bear said, without being there, we can't directly comment on your combustion air flow. One thing is certain, you DO need to have proper supply of air to your furnaces and water heater. That...
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    We cannot say over the internet. The proper way...

    We cannot say over the internet. The proper way to determine this is:

    ACCA Manual J Heat Load calculation: Determines the amount of heat load throughout the structure. From this, you can...
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    That big system, with the tiny return, is WHY you...

    That big system, with the tiny return, is WHY you current system:

    1) removes humidity so well. The air flow is so restricted, the discharge air off the coil is very low, maximizing moisture...
  43. I think its measurement problems you are seeing...

    I think its measurement problems you are seeing now. The only reason RH would 'jump' like that is due to temperature dropping.
  44. There are so many advantages to a larger...

    There are so many advantages to a larger dehumidifier, that if you are going to install one at all, you might as well install one that will dehumidify the whole house. However, the problem right now...
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    Not specifically in this case, but I have seen it...

    Not specifically in this case, but I have seen it on water booster pumps, not a bypass, but a dump to drain, on high pump case temp.
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    Gold Bond and loose fitting pants... helps with a...

    Gold Bond and loose fitting pants... helps with a sweaty drain...
  47. who added the spray foam 'extra'? Spray foam is...

    who added the spray foam 'extra'? Spray foam is great, because if can get in a fill hard to access areas, so it is the best option for sealing an existing structure. It is more expensive, I...
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    Agree with this - the trade-off is that you...

    Agree with this - the trade-off is that you continue to lose heat by putting it at the far end of the loop. If you don't need the water at ready temp everywhere in the building, you can instead put...
  49. I thought the gubbment was gonna pay for it all?

    I thought the gubbment was gonna pay for it all?
  50. Just from guessing, I'd say that your area is...

    Just from guessing, I'd say that your area is maybe borderline on whether a dehumidifier would be worth it. Most of your high dewpoint weather coincides with high temperatures, so in those cases,...
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