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  1. Replies
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    That convinces me. The only other check is to...

    That convinces me.

    The only other check is to disconnect the outdoor fan and run the head pressure up.

    20 years is respectable for a heat pump. I'd guess it was sized right, ducted right and...
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    Be sure r-valve is not stuck in the middle and...

    Be sure r-valve is not stuck in the middle and short cycling the refrigerant back into the compressor. It may have an abnormal sound. The best test for this is, with everything cooled to ambient,...
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    Good points. I change my mind. :) Defiantly,...

    Good points. I change my mind. :)

    Defiantly, oops I mean Definitely "Wall of Shame"!
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    I think it's pretty clever (and olso OCD, LOL)....

    I think it's pretty clever (and olso OCD, LOL). Does anyone remember the old york "Champions"? (there is one from 1976 that I still service)

    It had 10" or more of liquid line soldered to the...
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    $0.125 in Virginia. Woohoo!

    $0.125 in Virginia. Woohoo!
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    Beenthere could very well be correct, since the...

    Beenthere could very well be correct, since the manual specifies 1-1/8", we can easily assume that the SEER was calculated with an 1-1/8" vapor line.

    If the "7/8 line calculated at 13.9 SEER then...
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    You are fine at 7/8"

    You are fine at 7/8"
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    All else being in range, you would see a higher...

    All else being in range, you would see a higher evaporator temperature.
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    Excellent, but like me... have you encountered...

    Excellent, but like me... have you encountered situations with 0 subcooling on fixed orifice systems when the target superheat was correct?
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    But you charge Fixed orifice systems by target...

    But you charge Fixed orifice systems by target superheating right?

    The LL is un-insulated in order to give off heat. Insulating it (when needed) from gaining heat when probable is a good idea,
    ...
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    Terry, your logic is sound. The ideal situation...

    Terry, your logic is sound. The ideal situation if for all metering devices is to be fed a full column of liquid. This way the operation is very predictable.

    But, with fixed orifice systems...
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    Fixed Orifices on a/c and heatpumps True,...

    Fixed Orifices on a/c and heatpumps



    True, but it is a great verification that your meters are accurate or that the refrigerant is pure.



    Appion is an excellent choice for a micron gauge....
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    That would be a good test. There could be...

    That would be a good test.

    There could be various timers, temperature and pressure switches/sensors. This is where you need the techs knowledge of the system and it's operation.
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    Wow! It does look like the house is setting on a...

    Wow! It does look like the house is setting on a pad!



    hmm, that is not a normal cycle. Did you let the tech know? He may have to be there to witness it to tell exactly whats cycling the unit...
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    I think not if that is the only parameter that...

    I think not if that is the only parameter that seems out of range. If 22 degree split is what is needed for the space to be comfortable, and the low side is not too close to freezing, I'd let it be....
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    Very little, but what's really most important is...

    Very little, but what's really most important is if the home feels as comfortable as it has in the past. It may take awhile to "catch up" but it should eventually, now that your outdoor coil is clean.
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    What an eye! :) High side hose is parked on...

    What an eye! :)

    High side hose is parked on the manifold. :D

    I reckon it's 95 degrees out side, not in the condenser HA!
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    18-20 (or 14-20) is commonly accepted as...

    18-20 (or 14-20) is commonly accepted as standard.

    Inside temp spread can be as low as 7 to 13 degrees at indoor humidity levels of 90% as high as 25 to 29 degrees at indoor humidity levels of...
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    I see nothing wrong with the pressures, you have...

    I see nothing wrong with the pressures, you have a 42 degree evaporator and a 95 degree condenser.

    I do have my doubts about laser thermometer readings.

    Infrared thermometers have their...
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    Try ACCA.org (http://ACCA.org) to find a...

    Try ACCA.org to find a contractor near you.

    A precise Manual J room by room load calculation requires a lot of work. Many contractors will use rules of thumb for bidding purposes, and include the...
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    This may help....

    This may help. http://efficientcomfort.net/asp/PerformCalc_Web/PerformCalc_Web.asp

    Energy Efficiency Rate can be calculated directly, but HSPF cannot.
  22. Replies
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    Yes, you can, but the Testo H2 Humidity stick...

    Yes, you can, but the Testo H2 Humidity stick will convert it for you. Very good accuracy too.
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    X2 but don't worry, having Orange attached...

    X2

    but don't worry, having Orange attached won't blow it up :)

    I just lets the furnace know if a heat pump is in heat or cool mode,
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    BK on your AHU is a communicating wire that goes...

    BK on your AHU is a communicating wire that goes to a communicating t-stat. Which you don't have.

    Consult your Trane Tech support rep.
  25. Oops! Charge its correct then. Lower airflow...

    Oops! Charge its correct then.

    Lower airflow my give you lower humidity though. It would be worth having a credentialed technician give it a once over. Especially if it hasn't been looked at for...
  26. On second thought... lower airflow will give you...

    On second thought... lower airflow will give you better dehumidification. 55% RH @ 73 DB is not exactly standard design conditions.
  27. The old 5 ton coil would likely be re-ated for...

    The old 5 ton coil would likely be re-ated for four tons at 13 seer. Piston size will regulate flow more than it will regulate pressure. Heat absorption (airflow) will regulate pressure more than...
  28. hmmm... too bad. Maybe someday they'll figure how...

    hmmm... too bad. Maybe someday they'll figure how to make them out of carbon fiber and room temperature super conductors. :)
  29. Very cool. any idea where they're being used? ...

    Very cool. any idea where they're being used?

    I wonder what the down side is.

    Let me take a guess... NASA uses them in the astronauts power tools for space walks... downside: $$$$$ :)
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    Have a trained (preferably NATE or BPI certified...

    Have a trained (preferably NATE or BPI certified in air distribution systems) HVAC mechanic evaluate the airflow and velocity.

    He may suggest lowering the blower speed if airflow is too high.
    ...
  31. Replies
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    This suggests that there is liquid refrigerant...

    This suggests that there is liquid refrigerant still boiling off inside the compressors crankcase. I would wait for this to end and get the Discharge Temp up to at least 165 degrees

    Also, I'd...
  32. One recommendation on sizing advice is to request...

    One recommendation on sizing advice is to request a copy of the installing contractors load calculation report.

    A contractor with integrity won't mind sharing his engineering process and results...
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    Good news. With only a picture, it's hard to...

    Good news.

    With only a picture, it's hard to tell the difference between a dryer vent and a fart fan (aka bathroom exhaust) :)
  34. X2 And install at least one carbon monoxide...

    X2

    And install at least one carbon monoxide detector ASAP!
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    :eek2: Shame on them! Guess they'ed rather...

    :eek2: Shame on them!

    Guess they'ed rather have money then respect.
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    Yes, yes, yes and yes. The condenser airflow...

    Yes, yes, yes and yes.

    The condenser airflow is reduced and the compressor, fan motor and control cabinet (with the expensive circuit boards) will be hotter than intended.

    Heat is the enemy of...
  37. Thread: Leaky comp?

    by penderway
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    Head pressure is in range at 21 degrees over...

    Head pressure is in range at 21 degrees over ambient. (the old 30 rule of thumb only applies to 8 seer or less condensers or maybe refrigeration systems)

    2.9 compression ratio is also in range.
    ...
  38. Thread: Leaky comp?

    by penderway
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    478

    Airflow passes the temperature difference test....

    Airflow passes the temperature difference test. Superheat is too low for current conditions. System is overcharged if the indoor coil is a matched 10 SEER.
  39. Thread: Leaky comp?

    by penderway
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    478

    What was the indoor wet bulb temperature? It's...

    What was the indoor wet bulb temperature? It's key to the diagnosis. If you didn't get the WB, then would you characterize the indoor humidity as greater or less than 50%?
  40. Good post, plenty of info. Only the indoor wet...

    Good post, plenty of info. Only the indoor wet bulb is missing. If it is very dry where you live... then all your parameters are in range.

    If it is very humid... then you have "Low Evaporator Heat...
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    lkapigian, I think that statement needs some...

    lkapigian, I think that statement needs some clarification. Warning nit picking ahead! :)

    Superheat is a vapor.

    0 subcooling (or 0 superheat) is a vapor and liquid mixture.

    Can vary from a...
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    I found this that states factory charge at 9 lbs...

    I found this that states factory charge at 9 lbs 2 oz. With line set, total charge should be around 12 lbs.

    Never mind this, you'rs is 4TTB3042A not 4TTB3042D, My bad!
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    You've got some conflicting measurements assuming...

    You've got some conflicting measurements assuming your pressure is accurate. Adding almost 3 extra lbs seems correct for the lineset if the suction is 7/8". I don't think 3/4" is correct for the long...
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    A condenser fan motor with a failed (weak or...

    A condenser fan motor with a failed (weak or open) capacitor may not start on it's own... but of a gust of wind, (a stick on the end of your hand) or another condenser motor may get it turning (as...
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    True, It's an open book test here in Va. Take...

    True, It's an open book test here in Va.
    Take this test, and time your self. I can post you another if you wish (I have about a dozen).
  46. Replies
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    The International Mechanical Code book. (which...

    The International Mechanical Code book. (which ever year your state has adopted. Va is on 2012)

    Seriously, I read it cover to cover, (it also helped me get to sleep :) ).

    Each section/code I...
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    A+ for cleverness on both. C- for no...

    A+ for cleverness on both.

    C- for no transitions and no account for the "system effect" on the upflow unit (although I'd guess it's minimal).

    Not given you a hard time, both systems probably...
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    LOL... been there, done that too!

    LOL... been there, done that too!
  49. Ok, then I second that motion... all those in...

    Ok, then I second that motion... all those in favor say "Yea"... :bsing:
  50. Poor duct design with an ECM blower (they are...

    Poor duct design with an ECM blower (they are powerful enough to create very high high statics and velocity)
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