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  1. Replies
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    The chart is based on continuous operation. ...

    The chart is based on continuous operation.

    100% non-bleed TXVs commonly used today have lower efficiency losses compared to bleeding devices when cycled on and off. The effect of on/off cycle is...
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    In my opinion, the real specs on Goodman units...

    In my opinion, the real specs on Goodman units tend to be weak especially when value is only calculated using dollars for "SEER" and "tons".

    I don't have time to do this for every unit, so I'll...
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    no idea. i don't know much about propellers.

    no idea. i don't know much about propellers.
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    True, and I seem to recall they failed in the...

    True, and I seem to recall they failed in the distinctive power electronics way when they did break down letting out the factory smoke and popping the fuse. I'm not a TV designer, but isn't using...
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    GMS8's an 80 AFUE which behaves more or less like...

    GMS8's an 80 AFUE which behaves more or less like electric strips. You can choose which elements to fire and the temperature rise is directly proportional to BTUs and the rise is only dictated by...
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    Not really. tree tons 1400 1100 @0.1" ...

    Not really.

    tree tons
    1400 1100
    @0.1" @0.7"
    3.25 3.08

    1 speed 1/3hp
    10 x 9
  7. Some do harden. It's a nightmare. There's a...

    Some do harden. It's a nightmare. There's a product like this in the automotive market, because people use this crap. And it chits up the service equipment :(
    http://i.imgur.com/m930Zk1.png


    ...
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    I'd say they started becoming common around the...

    I'd say they started becoming common around the time flat screen TVs became the norm. The power supply has been and still is a very common crash and burn failure points. Power adapters used to feel...
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    There's no single answer. Even in...

    There's no single answer. Even in Dodge/Ford/Chevy arguments, I'm sure we can name a good and a bad vehicle from each brand.

    If you're looking at "trouble free", I would avoid anything using power...
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    efficent+comfort. its possible without power electronics embedded systems

    Here's the characteristic of a typical PSC motor. It shows the static vs power input, flow rate and cfm/W.

    The actual shaft blower shaft horsepowers are going up with increasing static. The...
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    And they're usually the weakest link. You start...

    And they're usually the weakest link. You start off with:

    http://i.imgur.com/r0Xd8rx.png

    then you change out to this:
    http://i.imgur.com/v8I2Vlr.jpg

    They both accomplish the same purpose....
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    This was a big deal with line voltage scopes...

    This was a big deal with line voltage scopes where the scope' "ground" side was attached to the metal chassis which is then attached to the electrical ground.

    It's less of an issue with a...
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    You can get by with one probe at this voltage...

    You can get by with one probe at this voltage level unless it's differential signaling where you're looking at +, G and - and you have the need to observe both sides with respect to the signal...
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    All in all, this is a simple fundamental...

    All in all, this is a simple fundamental explanation why ECM, X-13, EEM etc that use power electronics embedded system based design generally sucks.
    Traditional: Microchips housed within a...
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    You'll see that some window A/Cs will freely...

    You'll see that some window A/Cs will freely switch back and forth between different fan speeds to regulate sensible/latent ratio and those are disposable devices.

    PSC taps are internal...
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    The scope's in 20uS/div h, 2v/div s as you can...

    The scope's in 20uS/div h, 2v/div s as you can tell from the knobs.
    Not sure if his probe is 1x or 10x....

    Is your probe adjusted correctly? Connect it to a square wave 1KHz signal source and...
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    The thing is... relative humidity will go down...

    The thing is... relative humidity will go down without any dehumidification if you raise the temperature.
    If the house is 65% at 68F, using a heat pump or gas furnace with heatstat set to heat to...
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    Alright.. there ya go... I actually did the...

    Alright.. there ya go... I actually did the number crunching. I want to burn some natural gas while running the AC :D
    Started the discussion in Pro Building Science section:...
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    I just thought its important to really make it...

    I just thought its important to really make it clear just because of how different they behave and what leads tech to make a decision that ends up causing malfunctions. I wonder what caused the last...
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    Dehumidifier energy factor... like SEER....

    had to dig around a bit... and what I see is that they too are "at test points" just like AC units. The data is from the US Department of Energy. The original chart was in celsius and I replaced the...
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    ...

    ...
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    beautiful ;) obviously... disable the sling...

    beautiful ;)
    obviously... disable the sling ring to not allow re-evaporation indoor
    http://i.imgur.com/2WEZhHv.png
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    Not a stat. It's a cold control. Big difference...

    Not a stat. It's a cold control. Big difference in the way they control it. Some are constant cut-in, some constant diff and some odd-ball sliding scale differentials.
    Here's a cross reference...
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    New cap tube+ drier didn't fix it. So,...

    New cap tube+ drier didn't fix it.



    So, what was the actual cause? Was it just low on FREEON? You're back to where you started on suction.

    If you had the same suction pressure where it was...
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    Sorry, but no. I plotted this out from factory...

    Sorry, but no.
    I plotted this out from factory data a while ago.
    http://i.imgur.com/Juafk9j.jpg


    This, I agree. ECM contains what's known as full conversion power electronics. This means that...
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