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Type: Posts; User: hvacrmedic

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  1. Replies
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    321

    Your question is wrong. The equipment produces...

    Your question is wrong. The equipment produces 2815 btu per hour. If you're not removing at least the same amount of heat from the space (at the same rate) then the temperature will continuously rise...
  2. Leak rate is proportional to the square root of...

    Leak rate is proportional to the square root of the pressure difference. If you quadruple the pressure the leak rate will double.
  3. If your ducts run through an unconditioned space...

    If your ducts run through an unconditioned space then high stage will be the most energy efficient due to the lower percentage of duct heat loss. Duct heat loss is a function of air velocity. Slower...
  4. Mine acted the same way, same error code and...

    Mine acted the same way, same error code and sometimes a different code. Sent it off and it came back with a new, apparently upgraded, sensor. No issues so far except for one occasion of oil fouling....
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    1.5 to 8.5 means that the meter is broken. It...

    1.5 to 8.5 means that the meter is broken. It shouldn't change more than a few tenths of an amp in that amp range.
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    561

    A basic meter like the 902 is really all we need...

    A basic meter like the 902 is really all we need for probably 99% of the stuff we do. Heck my 322 is enough for most calls. The reason I got the 289 was primarily for it's data logging and graphing...
  7. Thread: Efficiency

    by hvacrmedic
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    321

    Longer runtimes reduce start-up losses since...

    Longer runtimes reduce start-up losses since there will be fewer starts. Lower ambient temps reduce the load on the compressor, allowing it to pump a bit more refrigerant while pulling fewer watts.
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    1,088

    The relay coil is in parallel with the start...

    The relay coil is in parallel with the start winding. The voltage drops across the start winding and the capacitor are not the same.
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    850

    He has a video on the Insight Plus. Close enough....

    He has a video on the Insight Plus. Close enough. The Insight basic doesn't have graphing. That's about the only real improvement with the Plus that I could see. Other than that it's pretty much the...
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    That's what happened here too. :) FWIW I got...

    That's what happened here too. :) FWIW I got $389 for it. Not too shabby. If it wasn't so damned huge I probably would have had it in my bag the whole time. I traded it in for an 87v, the next best...
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    1,088

    No, it'll only show you the actual capacitance.

    No, it'll only show you the actual capacitance.
  12. Replies
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    561

    ⌛ Sold!



    Sold!
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    738

    If it's multiple choice then it's usually looking...

    If it's multiple choice then it's usually looking for the best answer amongst the choices given rather than the full and complete answer. There are a number of factors that determine motor speed....
  14. Yep.

    Yep.
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    Don't overthink it. Why is the suction pressure...

    Don't overthink it. Why is the suction pressure dropping? If you're losing refrigerant then the drop in suction pressure will be met with an even greater drop in discharge pressure. The compression...
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    The Cooper is more accurate. I'm using the Cooper...

    The Cooper is more accurate. I'm using the Cooper SHR77a with my digicools too. The temperature probes are the only weak point on the digicool line, either the leads break or they're simply...
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    452

    Here's Part 1 of that series. ...

    Here's Part 1 of that series.

    http://www.achrnews.com/articles/performing-residential-combustion-analysis

    I've talked with Jim Bergmann on the phone. Extremely smart guy. I was a little...
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    886

    Maybe they're just junk? There have been several...

    Maybe they're just junk? There have been several similar accounts posted.

    I use these.
    http://www.rectorseal.com/index.php/hard-start-kits-kickstart-compress

    FWIW these are OEM in some...
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    886

    Only 3 wires, but easy to miswire. Seems to...

    Only 3 wires, but easy to miswire. Seems to happen a lot judging by the number of threads just like this one.

    434711
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    Well dumbass me went and bid on a Fluke 87v on an...

    Well dumbass me went and bid on a Fluke 87v on an impulse. I ended up winning it with that single bid. Holy crap I didn't really need another meter! I'm trying to sell some of the ones I already...
  21. That's technically correct, but even that isn't...

    That's technically correct, but even that isn't sufficient. An intermittent lead connection could still trip you up when doing that. I've had it happen once. Once was enough, because it are my ass...
  22. Nobody reads the instructions or warnings. "Test...

    Nobody reads the instructions or warnings. "Test on a known live circuit before use!" I'm sure that all NCV meters have this warning in the literature, and some have it right on the tester itself. ...
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    Lol! :) But wait, there's more. I found the...

    Lol! :)

    But wait, there's more. I found the original case out in my garage. Had about a 1/4 inch of dust on it, but otherwise in brand new condition. I'm going to clean up the case tomorrow and...
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    Looks pretty rough. I give you 10 dollars for it.

    Looks pretty rough. I give you 10 dollars for it.
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    I was considering that.

    I was considering that.
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