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  1. Replies
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    Also, 'cranking a unit down to 70F' is no way to...

    Also, 'cranking a unit down to 70F' is no way to reduce relative humidity.
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    678

    He did say 'rarely'. which is exactly when...

    He did say 'rarely'. which is exactly when design conditions exist. In any case, 'design conditions' are only good to use when you only care about the comfort level at design conditions. I find...
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    "Dorothy Mantooth is a saint!"

    "Dorothy Mantooth is a saint!"
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    The easy fix is to install a proper dehumidifier...

    The easy fix is to install a proper dehumidifier on the home. The quick attempt is a portable type.
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    I'd agree, it's probably humidity. Dry the air,...

    I'd agree, it's probably humidity. Dry the air, and the person who's comfortable at 71F when humid may be perfectly fine at 76F when humidity is more reasonable. a portable dehumidifier won't...
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    a dehumidifier isn't just a fix for a system that...

    a dehumidifier isn't just a fix for a system that is too big. Depending on the climate (and especially in yours) no pure air conditioner is going to maintain humidity year round. Times exactly like...
  7. It could be a grounding issue - sort of. A...

    It could be a grounding issue - sort of. A ground rod isn't going to fix it though. For safety, you really should not ever have more than one ground rod in your home. That said, there is probably...
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    Just realize that he was wearing gloves when this...

    Just realize that he was wearing gloves when this happened.
  9. Replies
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    0.433psi per foot

    0.433psi per foot
  10. I just hate it when the ghost of Darwin is slow...

    I just hate it when the ghost of Darwin is slow and doesn't kill the idiot until after he's had offspring...
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    I just figured it was the decidedly good looks......

    I just figured it was the decidedly good looks... but I can see that too...
  12. Replies
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    406

    honestly, in your climate, I'm not sure it's ever...

    honestly, in your climate, I'm not sure it's ever hot or cold enough to NEED an ERV or HRV, the difference between outdoor and indoor temps are unlikely to make a huge impact, and as you said, you...
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    406

    I hope you can see the contradiction here. It...

    I hope you can see the contradiction here. It can't be that tight, if it still breathes adequately, and that breathing in uncontrolled, and through whatever cracks and gaps it can find in the...
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    Volume would have more impact on a manual D and...

    Volume would have more impact on a manual D and the air change of the individual rooms than it would on a manual J heat load and equipment sizing. If anything, it's probably short cycline because...
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    Honestly, my first recommendation on a 3 level...

    Honestly, my first recommendation on a 3 level structure that size? Don't go with a single unit, even with dampers. Comfort levels will never be what you would want. If you were already going to...
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    Why would you wish that on anyone? I run my...

    Why would you wish that on anyone? I run my humidifier with my air conditioner at the same time here.. :-)
  17. Replies
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    884

    To me, the real advantage of a separate...

    To me, the real advantage of a separate dehumidifier, is that it removes moisture a LOT more efficiently than an air conditioner. (W/btu), but that is because it is not 'removing' those BTU's from...
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    could simply be blocked with sludge and foreign...

    could simply be blocked with sludge and foreign material. My guess is these coils are the low-point in the system, so sediment is most likely to settle down there. You might try backflushing the...
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    Also, having that low of a pressure on the return...

    Also, having that low of a pressure on the return headed means that the pressure at the higher levels would be less than atmospheric, meaning any minor leak would be pulling air into your loop,...
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    Gravity. The static pressure drops 0.433 psi for...

    Gravity. The static pressure drops 0.433 psi for every foot of elevation. So, if each story is 10 feet, then 6 stories up the pressure would be 26 psi lower than in the basement. If you have a...
  21. Replies
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    Probably the 'best' option is backdraft dampers...

    Probably the 'best' option is backdraft dampers on the lag fans. This will not only fix the issue of the fans spinning backward, but will also likely delay the lag fans even needing to run in the...
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    The good news is skin heals from 2nd degree burns...

    The good news is skin heals from 2nd degree burns pretty well. The bad news it does so slowly...
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    891

    if there's a manual vent on the separator, see if...

    if there's a manual vent on the separator, see if there's air there or not. If it bleeds a bunch of air out, the auto-vent is not functioning, and needs to be replaced.
  24. Replies
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    I honestly don't see a reason to measure it,...

    I honestly don't see a reason to measure it, unless its just personal curiosity. In a dry climate, you can't really have TOO high of a cfm/ton, and I've seen up to 800-1000 cfm/ton work extremely...
  25. Replies
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    Honestly, where he's at in southern arizona,...

    Honestly, where he's at in southern arizona, there is almost no time in the year where an AC would be removing ANY moisture no matter what the runtime is. Average dewpoint in tucson for the last 365...
  26. Replies
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    Technically, mold will start growing if there is...

    Technically, mold will start growing if there is condensed water. This means dewpoint has to be higher than the coldest surface in the structure (usually the incoming cold water temp) for mold to be...
  27. Replies
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    No, dryer air will always feel colder at the same...

    No, dryer air will always feel colder at the same temperature than humid air. Not only is the skin evaporation rate faster, but you actually lose a LOT more body heat in your lungs (actually entire...
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    Could also be a lot of dissolved gasses in the...

    Could also be a lot of dissolved gasses in the water, which will increase noise at large pressure drops (like barely open control valves). Does the system have an air separator, and is the auto-air...
  29. Replies
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    I can't ever imagine needing 70F indoor temp in...

    I can't ever imagine needing 70F indoor temp in a desert. At desert humidities, 70F is downright chilly for most people.
  30. Replies
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    In my experience, no builder has ever done a load...

    In my experience, no builder has ever done a load calc on a tract home.... ever... Every single one has too large of equipment for the home (usually by at LEAST a ton), with ductwork from 1/2 to 3/4...
  31. Replies
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    Sizing an air conditioned based on square footage...

    Sizing an air conditioned based on square footage is a long standing extremely poor practice, and will ALWAYS result in an oversized system. This is because there are so many variables involved, so...
  32. Replies
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    Which is especially true when the system doesn't...

    Which is especially true when the system doesn't even have sufficient ducting for the larger equipment (almost ALWAYS the case).
  33. Replies
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    It certainly does look like it was installed to...

    It certainly does look like it was installed to be temporary - but I can tell you, many 'temporary' measures remain permanent as long as they are working.
  34. Replies
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    When talking about lighting inside a structure,...

    When talking about lighting inside a structure, essentially 100% of the energy consumed by the light ends up a heat in the structure. This is the same for halogen lights as it is for LED lights. ...
  35. Replies
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    I will say, that your current system does seem...

    I will say, that your current system does seem quite oversized, based on it only running about 30% of the time when 105F outside. That's also not uncommon on tract homes, as they are not likely...
  36. Replies
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    In dry weather, the higher the air-flow the...

    In dry weather, the higher the air-flow the better. A given air conditioner will remove a relatively fixed amount of heat from the airstream, and ultimately, from the home. A higher airflow, while...
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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
  38. Replies
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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.
  39. Replies
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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.
  40. 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...
  41. 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.
  42. Replies
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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...
  43. Replies
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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.
  45. Replies
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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.
  46. 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...
  48. 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...
  49. Thread: BBMD vs VPN

    by CraziFuzzy
    Replies
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    3,887

    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...
  50. Thread: BBMD vs VPN

    by CraziFuzzy
    Replies
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    3,887

    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...
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