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    Can't go wrong with the 510 IMO. I've had one for...

    Can't go wrong with the 510 IMO. I've had one for several years now, still works great, still accurate. I use it a lot. Magnet is a little weak, but not a deal breaker.
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    The problem is most likely the disconnect itself....

    The problem is most likely the disconnect itself. Call an electrician instead, maybe he'll know how to properly diagnose it.
  4. If you don't know what the TESP should be, then...

    If you don't know what the TESP should be, then what will you do with the info? You've already calculated the TESP in your first post. Another measurement will either be redundant, or else...
  5. Don't over-think it. Download the installation...

    Don't over-think it. Download the installation manual for your furnace. Read the section on adjusting airflow. Likely it will instruct the installer to adjust airflow up or down in order to achieve a...
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    They either break, are innacurate, or get lost. I...

    They either break, are innacurate, or get lost. I gave up on them a few years ago. The Cooper blue box is harder to lose track of, does the same job, and is more accurate. I use it for probably over...
  7. Ohm's Law at work. P = I^2 x R. Get the R...

    Ohm's Law at work. P = I^2 x R.

    Get the R (resistance across the connnection) down to 0 ohms and the P (power dissipated/heat) will also drop to 0.
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    He was testing the popper, not the transformer.

    He was testing the popper, not the transformer.
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    IMO you're selling the wrong one.

    IMO you're selling the wrong one.
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    First, if your intent was to test it, then you...

    First, if your intent was to test it, then you wired it exactly right. The purpose of the popper is to open up in case of a short or overcurrent situation. If there is a dead short in a system that...
  11. The meter lead resistance has to be subtracted...

    The meter lead resistance has to be subtracted out. When you subtract that resistance out the winding reisistance should add up to within a tenth of an ohm. Short the leads together in the ohms...
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    I think the idea was that you could strap your...

    I think the idea was that you could strap your accessories to it with those slots.
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    I made several suggestions back when it was...

    I made several suggestions back when it was relatively new. He has really improved it over the last few years to the point that it's marketable IMO.
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    9 or 10 seer CTD range is 15-25. Where did you...

    9 or 10 seer CTD range is 15-25. Where did you get this data?
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    Atmospheric pressure isn't the issue. The primary...

    Atmospheric pressure isn't the issue. The primary reason that charging in the rain can be problematic is that the condenser coil will likely be running wet, which will have a large effect on system...
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    There's little difference when TESP on high speed...

    There's little difference when TESP on high speed is over 1". At normal static pressures there's a significant difference in cfm between speeds.
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    And if it's a heat pump the only argument is...

    And if it's a heat pump the only argument is exposure to the elements. The entire condenser is out there though, sooo.... If I saw a lot of problems with driers installed outdoors I'd probably...
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    I've only ran across one rusted through drier in...

    I've only ran across one rusted through drier in the 30 years I've been doing this, and if I'm not mistaken that was only because it was completely buried in sand for 20 or 30 years and 10 feet from...
  20. http://hvac-talk.com/vbb/image.php?u=5587&dateline...

    http://hvac-talk.com/vbb/image.php?u=5587&dateline=1192655164&type=thumb
    Excuse me, did you say something?
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    So how many of you don't adjust blower speed...

    So how many of you don't adjust blower speed after major changes to the air circuit have been made? What happens to motor amps and static pressure when you increase the rpm to maintain the initial or...
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    If they're really bad I take them to the car wash.

    If they're really bad I take them to the car wash.
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    There are some energy costs. The blower requires...

    There are some energy costs. The blower requires more power to overcome the added air stream restriction. The lower coil temp also reduces the ac system efficiency.
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    It came with a calibration certificate from...

    It came with a calibration certificate from Transact. After reading the specifics of the calibration procedure I understood that it was calibrated correctly. The calibration sheet gives offsets which...
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    The dot matrix display is horrible. When the...

    The dot matrix display is horrible. When the value is changing you can't read the last digit or two or three. It also washes out at an angle. The meter itself was disappointing because the only time...
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    Worked it out on the chart. Yes, that works very...

    Worked it out on the chart. Yes, that works very well! Got it, thanks. I learned something new today.
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    It's about time! ;) I wouldn't have expected...

    It's about time! ;)

    I wouldn't have expected that much improvement by doing that. Very interesting.
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    Ok, I figured that in, and only got SHR of the...

    Ok, I figured that in, and only got SHR of the coil up to 0.39. Apparently we need another 5 or so of reheat (don't quote me on that number) from somewhere. Why don't you buy one of those...
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    That's worth nearly 1.5 of reheat at circa 400...

    That's worth nearly 1.5 of reheat at circa 400 SCFM. Given that the deltaT is only 10 that's actually quite significant.
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    The reason isn't difficult to discover. How many...

    The reason isn't difficult to discover. How many people keep their house at 80 and 60% RH? If the SST is running at close to or even below freezing under these conditions, what SST will it be...
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    Doesn't matter. At lower coil temps the SHR...

    Doesn't matter. At lower coil temps the SHR starts to go back up rather than down. The sensible capacity increases by a higher factor than the total capacity. The frost itself poses yet another...
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    When I plug the given data into my psychrometric...

    When I plug the given data into my psychrometric spreadsheet the unkown values magically appear, which is what it was designed to do. ;) Well there's a little more to it than that, I sometimes have...
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    How so? It's an invalid process. The process line...

    How so? It's an invalid process. The process line doesn't intersect the saturation curve. How did any condensation take place if none of the air dropped to its dewpoint? The leaving air condition...
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    There will be some small error due to the gasses...

    There will be some small error due to the gasses not being perfectly ideal, but nothing as great as what you've been led to believe. The thing about the process line being in reality a curve is...
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    That appears to be an invalid psychrometric...

    That appears to be an invalid psychrometric process.
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    Garden spider ...

    Garden spider
    ...
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    A dirty coil can cause this. The trap may also be...

    A dirty coil can cause this. The trap may also be inadequate.

    510391
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    Cleaning may cure it, but it could also be due to...

    Cleaning may cure it, but it could also be due to leaks in the coil. Oil from the system contaminates the fins and the water falls off. A quick scan with an electronic leak detector might save you...
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    The inrush current is reduced. Several...

    The inrush current is reduced. Several manufacturers make soft starters, and they're just speed controllers. They ramp up the motor.

    This article covers the technical aspects.
    ...
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    Theo, here's another way to say what I did above....

    Theo, here's another way to say what I did above. Suppose the system is initially dumping 1 gallon of water per cycle. It's running twice each hour, for 15 minutes each time. 50% load. The...
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    I don't believe that I insinuated anything, I...

    I don't believe that I insinuated anything, I stated outright that the starved coil, if bottom fed, will dehumidify better. :)

    Again, like PHM you're looking at size of the stream of water leaving...
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    Tightening up the house would certainly reduce...

    Tightening up the house would certainly reduce air conditioner power consumption, but this thing about start-up amps being a big expense is just ridiculous. Have you ever done the math?

    Suppose...
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    The behavior of the system as far as moisture...

    The behavior of the system as far as moisture removal and a low charge depends upon whether the coil is TXV or piston metered and upon how the evap coil circuit is configured. Be careful when...
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    The Sensible Heat Ratio is the sensible capacity...

    The Sensible Heat Ratio is the sensible capacity divided by the total capacity. At an SHR of 0.50 the sensible and latent capacities are equal. At higher SHRs the total capacity is mostly sensible,...
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    Latent capacity and SHR are different things. A...

    Latent capacity and SHR are different things. A low SHR is what you want for better dehumidification, the latent capacity is immaterial since the sensible capacity may be higher too. The shorter...
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    I was addressing this comment of yours in...

    I was addressing this comment of yours in particular. "...totally flooded evaps provide the highest latent removal ratio."

    What did you mean by that? I think we're on different pages. Maybe you...
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    Suppose return air dewpoint is 50. The coil is...

    Suppose return air dewpoint is 50. The coil is running with a SST of 50.5, so no condensation takes place. The charge is reduced until SST is 32. SH is high. Latent capacity is still zero? I'm...
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    It's always good to have a backup, that's one way...

    It's always good to have a backup, that's one way to look at it? Hmm...

    FWIW the wireless pressure transducers could easily be mounted to the manifold of your choice with the iConnect strapped to...
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    The more you add the less likely it'll freeze. If...

    The more you add the less likely it'll freeze. If you add enough refrigerant any drop in temp will actually diminish and can even disappear completely. That isn't common knowledge so I do my best to...
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    I need to clarify that the loss in capacity...

    I need to clarify that the loss in capacity mentioned above is only a loss compared to the TXV coil under the same conditions. Both systems will experience a gain in total capacity at lower ambients.
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