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  1. Replies
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    From Trump's own mouth. ...

    From Trump's own mouth.


    https://youtu.be/72Mqn-Qi4i4
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    My condolences. Time will be your best friend.

    My condolences. Time will be your best friend.
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    He's trying to round up votes. Traditionally...

    He's trying to round up votes. Traditionally fruitcakes are liberals, and will tend to vote Democrat. Democrats have demonstrated a disregard for the lives of LGBTs by their acceptance of and...
  4. What was the suction pressure and return air temp?

    What was the suction pressure and return air temp?
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    http://www.electricmotorwarehouse.com/content/PDF/...

    http://www.electricmotorwarehouse.com/content/PDF/fasco_motor_facts.pdf
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    Ok, well I've been through this with a Lennox...

    Ok, well I've been through this with a Lennox unit before. Order the oem motor and save yourself some trouble.
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    The original was probably a 1/6 or 1/5 HP, and...

    The original was probably a 1/6 or 1/5 HP, and the 1/3 that you used is oversized and overheating.
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    Is the air filter dirty?

    Is the air filter dirty?
  9. Thread: Subcooling

    by hvacrmedic
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    It's better than nothing, but don't count on it...

    It's better than nothing, but don't count on it being precise. Best to return on a warmer day to trim the charge. That's what we do.
  10. Thread: Subcooling

    by hvacrmedic
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    Condenser TD is the difference between condensing...

    Condenser TD is the difference between condensing temp and ambient temp. Some call it CTOA (condensing temp over ambient).

    The head runs high with a dirty coil due primarily to the reduction in...
  11. Thread: Subcooling

    by hvacrmedic
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    No no no. The refrigerant in a cylinder can...

    No no no. The refrigerant in a cylinder can linger forever, and never gain SC. With a partial restriction you have more liquid in the condenser, yet SC may be very low due to the TD being low....
  12. Thread: Subcooling

    by hvacrmedic
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    Reducing condenser airflow doesn't have the same...

    Reducing condenser airflow doesn't have the same effect on the system that an increase in ambient does. Both will raise the head pressure, but reducing airflow will increase the condenser TD, while...
  13. Thread: Subcooling

    by hvacrmedic
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    What does that have to do with the OPs question?

    What does that have to do with the OPs question?
  14. Thread: Subcooling

    by hvacrmedic
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    I believe the chart I posted assumes a perfect...

    I believe the chart I posted assumes a perfect system.
  15. Thread: Subcooling

    by hvacrmedic
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    Except when it's higher.

    Except when it's higher.
  16. Thread: Subcooling

    by hvacrmedic
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    1,273

    It says "heat pump charging chart" at the top. ...

    It says "heat pump charging chart" at the top.

    The installlation manual for this model references this charging chart (which is located on the inside of the cover), and specifies that the ambient...
  17. Thread: Subcooling

    by hvacrmedic
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    You could say the same about any SH chart. What...

    You could say the same about any SH chart. What would be the point in plotting the required SH or SC at different conditions if each entry corresponded to a different total charge?
  18. Thread: Subcooling

    by hvacrmedic
    Replies
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    Neither of the above. On some systems SC will...

    Neither of the above. On some systems SC will rise, on others it will drop. On others it will first drop and then rise as ambient drops further. See the attached SC chart (cooling mode) in the center...
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    76 Summer, 74 Winter.

    76 Summer, 74 Winter.
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    Sorry, I missed the word standing.

    Sorry, I missed the word standing.
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    If the airflow is adjusted for that purpose, then...

    If the airflow is adjusted for that purpose, then yes, but technically there are any number of combinations of airflow and temperature that can provide the same system pressures.
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    You'd have to adjust the airflows to provide the...

    You'd have to adjust the airflows to provide the same evaporator and condenser loads.
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    It is a 3 ton air handler. Because it has a...

    It is a 3 ton air handler. Because it has a varible speed ECM motor that can run at much lower speeds, it can also be used with smaller condensers.
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    The distinction is more important if you're a...

    The distinction is more important if you're a pilot. Being 2 off on SH won't cause you to plow into a hillside.
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    Indeed. Suppose the absolute pressure on the low...

    Indeed. Suppose the absolute pressure on the low side is 75 psia. Gauge pressure at sea level would be aproximately 60.3 psig. Now you tote the entire system to Denver. The absolute pressure on the...
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    No, you cannot. That PT relationship is for sea...

    No, you cannot. That PT relationship is for sea level measurments only.
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    Yes. But only when using a sea level PT chart.

    Yes. But only when using a sea level PT chart.
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    I'm confused, do you agree with what I said or do...

    I'm confused, do you agree with what I said or do you disagree? I'm pretty sure I just said you'd have to adjust for altitude.
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    This is absolutely wrong. After zeroing your...

    This is absolutely wrong. After zeroing your gauge you will either have to adjust the reading down at higher elevations in order to use a standard PT chart, or else use a PT chart made specifically...
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    [QUOTE=hedrash;23145371]I'm sorry but PSIA is not...

    [QUOTE=hedrash;23145371]I'm sorry but PSIA is not the same at all altitudes. If you zero your gauges, you don't need to adjust anything. Even the PT charts I have say add 2.5psig at 5000ft unless...
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    You got that backwards, psia is the same at all...

    You got that backwards, psia is the same at all altitudes, it's the psig that is relative.

    Zeroing the gauges alone won't get you the right pressures.
    If you zero the gauges at 6000 ft, then...
  32. You have a severely mismatched system.

    You have a severely mismatched system.
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    I'd wager you got it wired incorrectly.

    I'd wager you got it wired incorrectly.
  34. Thread: TXV Woes

    by hvacrmedic
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    Sometimes yes, most of the time no.

    Sometimes yes, most of the time no.
  35. Thread: TXV Woes

    by hvacrmedic
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    "The ZR18K* to ZR81K* and ZP24K* to ZP91K*...

    "The ZR18K* to ZR81K* and ZP24K* to ZP91K* compressors have an internal thermo-disc discharge gas temperature protection. This thermo-disc opens a gas passage from the discharge port to the suction...
  36. Thread: TXV Woes

    by hvacrmedic
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    You misdiagnosed it. Live and learn.

    You misdiagnosed it. Live and learn.
  37. Check the condenser fan motor bearings/amp draw....

    Check the condenser fan motor bearings/amp draw. Probably overheating and kicking out intermittently.

    This should also be in the pro residential forum.
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    I agree this was probably a meter artifact. The...

    I agree this was probably a meter artifact. The windings have capacitance relative to ground, so there will be initial current, which your meter on the ohms scale will interpret as continuity. As the...
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    Depends upon what you're expecting. Can you get...

    Depends upon what you're expecting. Can you get sufficient airflow with it, sure. Will it be silent, probably not, but it won't be excessively noisy either. If you already have it installed, then you...
  40. One of these...

    One of these
    http://www.libertypumps.com/Data/ProductImages/331.jpg


    And one of these
    http://www.northerntool.com/images/product/400x400/481/48173_400x400.jpg
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    Glad to see you're still around too!

    Glad to see you're still around too!
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    Suction pressure plus spring pressure equals bulb...

    Suction pressure plus spring pressure equals bulb pressure. Bulb pressure is an opening force and the suction and spring pressures are both closing forces.
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    I think it'll will swing wide open due to the...

    I think it'll will swing wide open due to the bulb pressure being much higher than the suction pressure plus spring pressure.
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    Given that he will want to retain all of the...

    Given that he will want to retain all of the attention I predict that he picks a relative unknown with little charm, but a solid republican. Tom Cotton, from my home state, is a very likely...
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    I'm guessing that the unit manufacturer takes...

    I'm guessing that the unit manufacturer takes measures to insure proper crank case oil levels.
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    Coincidentally I removed a leaking accumulator...

    Coincidentally I removed a leaking accumulator today. (That's right "removed" not replaced, that's another story) It had I'm guessing about a half cup of oil in it. I spilled it on my tennis shoe...
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    Thanks for the correction. That's just what I...

    Thanks for the correction. That's just what I heard, never bothered to look that one up.

    Ok, the Venturi thing. For some reason I was thinking of a thread a while back where it was suggested that...
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    Yes the the heat pump accumulator has a bigger...

    Yes the the heat pump accumulator has a bigger orifice.
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    Well it was a great post until he got to the...

    Well it was a great post until he got to the Venturi part. The liquid is forced through the orifice by the pressure drop and buy the liquid head. The velocity is way too low to generate a Venturi...
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    The only thing that stood out as nonsense (your...

    The only thing that stood out as nonsense (your word!) was the thing about the attic increasing the LL pressure. Though the LL gains heat it doesn't cause the pressure to rise, it simply heats the...
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