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  1. The SHR can vary anywhere from 0.5 to 1 depending...

    The SHR can vary anywhere from 0.5 to 1 depending upon conditions, and SHR is that ratio, so there's my answer.
  2. The evap load corresponds roughly to the wet bulb...

    The evap load corresponds roughly to the wet bulb temperature. This can be seen in the performance data.
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    The suction pressure isn't high, unless the RH is...

    The suction pressure isn't high, unless the RH is very low. We don't have enough info for a full evaluation on this one.
  4. Whether you have to make a repeat call or not...

    Whether you have to make a repeat call or not will depend upon the complexity of the problem. Have you ever demanded a satisfaction guarantee from you doctor?
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    The low subcooling and low suction pressure...

    The low subcooling and low suction pressure indicate low airflow. The somewhat low deltaT seems to contradict that. Could be a significant amount of air bypassing the coil based on your report, which...
  6. Thanks. In case you're interested here are a...

    Thanks. In case you're interested here are a couple of links to download the latest version, 4.9. I feel like it's finally completely bug free, and I've added a couple of extra calcualtions.
    ...
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    Someone stole your bike. Man that sucks!

    Someone stole your bike. Man that sucks!
  8. Either or. If you have db, then RH and wb...

    Either or. If you have db, then RH and wb provide exactly the same info. There are formulas for converting one to the other, but they're approximations. For something like this that would be fine....
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    Thanks for asking for my input, but slctech...

    Thanks for asking for my input, but slctech covered everything I had to say and then some. Wow, what a post. Best of luck with it though.

    I started to make some training videos myself, but...
  10. The chart isn't mine, just the formula. I used...

    The chart isn't mine, just the formula. I used that chart to derive the formula (both forms). I believe that chart is from Wayne Pendergast's efficientcomfort website.
  11. I posted on on here at one time, I'd have to look...

    I posted on on here at one time, I'd have to look it up myself.

    OK, here ya go,

    TEET = ((3*entering wb)+(2*entering db)-112)/4

    http://www.scribd.com/doc/130901876/Teet-spreadsheet
  12. The instructions IMO don't provide the best...

    The instructions IMO don't provide the best method of exercising the valve. Since the txv is restricted it's naturally already being forced open, therefore heating the bulb will acco plish very...
  13. Well, that's a good point. FWIW there are times...

    Well, that's a good point. FWIW there are times when I intentionally leave the old capacitor in when changing out a motor. That's kind of along the same lines of reasoning.
  14. You need to sell them some new units.

    You need to sell them some new units.
  15. Yes you did, but didn't specify what SEER you...

    Yes you did, but didn't specify what SEER you were starting with, so it is a little misleading. There aren't many 6-8 SEER systems still being used out there. ;)
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    I get the feeling that you enjoy what you do. I...

    I get the feeling that you enjoy what you do. I used to do some field engineering once upon a time, when I was an in-house tech. I miss that part of it. I don't toy with customer's systems much...
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    Well it sure won't hurt anything, so might as...

    Well it sure won't hurt anything, so might as well do what you're comfortable with. FWIW, and this is just academic, when the suction line cools the bulb, even if there was liquid in the cap tube,...
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    With an MOP charge there's very little liquid to...

    With an MOP charge there's very little liquid to speak of in the bulb. Makes no difference which way the tail is pointing.
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    Actually the theoretical minimum head is (ambient...

    Actually the theoretical minimum head is (ambient + required SC) converted to pressure.

    You can run the tstat up a bit with lower RH, but the dehumidification is still not free. I agree that the...
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    You're confusing discontinued with obsolete, not...

    You're confusing discontinued with obsolete, not the same. Read the notes. Look at the column near the end where it says "Eligible for Federal tax credit --Yes"
  21. That's exactly how I expected it to read.

    That's exactly how I expected it to read.
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    On newer systems it doesn't matter. Some of the...

    On newer systems it doesn't matter. Some of the older TXVs would allow liquid to seep past the push pins and out through the equalizer tube, but newer TXVs don't have this issue, or so we've been...
  23. Seems logical. A little more difficult to inject...

    Seems logical. A little more difficult to inject there though.
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    It drops, but you knew that. I guess the question...

    It drops, but you knew that. I guess the question is geared more toward "how much?". Some of the Carrier install manuals cover the drop in SEER. They provide a list of all the settings required to...
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    The AHRI number is valid, but the air handler...

    The AHRI number is valid, but the air handler model is discontinued. The L on the end of the new replacement model stands for aluminum coil.
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    Probably due to the EER being too low. Well maybe...

    Probably due to the EER being too low. Well maybe not, I looked it up and it seems fine to me. I dunno, anyone else? On second thought, some of the certified match-ups do fall short on EER for the SW...
  27. No problem. As a rule of thumb higher...

    No problem. As a rule of thumb higher efficiencies are provided by reducing the compression ratio (lower head and/or higher suction). This allows the compressor to pump more refrigerant using less...
  28. The condensing temp over ambient is called the...

    The condensing temp over ambient is called the "condenser TD". If you don't know what the condenser TD should be, then the actual TD won't help. 30° would be in the 10 SEER range (25-35). For high...
  29. [QUOTE=criss;21216801]what other tools do we have...

    [QUOTE=criss;21216801]what other tools do we have for trouble shooting other then superheat, sub cooling, drop across the evaporator, rise across the condenser and ambient temperature to determine...
  30. I think you're operating with a faulty premise...

    I think you're operating with a faulty premise here. The only way the winding resistance will change is with either a change in temperature or a short of the winding to either to itself or to an...
  31. He was saying TD was 40°, deltaT 20°. On modern...

    He was saying TD was 40°, deltaT 20°. On modern systems (10 SEER and above) a TD of 40° would be considered extremely high and would indicate a heat transfer issue. Exceptions would be systems in...
  32. There's no logical reason for those differences...

    There's no logical reason for those differences to be numerically equal, as aesthetically pleasing as that might have been.
  33. That isn't old school, that's ancient school. ;) ...

    That isn't old school, that's ancient school. ;)
    Looks like a 6-8 SEER system with that 40° TD. New school would be 73* RAT, 53* air temp off of evap coil, 43* freon inside evap coil.
  34. This is called the evaporator TD and generally...

    This is called the evaporator TD and generally runs between 25-35° on normally operating systems. Lower SEER systems run higher TD's and higher SEER systems run lower TD's. The exact TD for any...
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    Since it's likely your ad, I'm sure it did.

    Since it's likely your ad, I'm sure it did.
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    I like that new feature as well. Very nice.

    I like that new feature as well. Very nice.
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    Yes, it's 16SEER.

    Yes, it's 16SEER.
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    The model number.

    The model number.
  39. I was waiting for the dealership to finish up on...

    I was waiting for the dealership to finish up on my car, lots of time on my hands.:)
  40. Both. The formula agrees with most charts within...

    Both. The formula agrees with most charts within a degree or two throughout the normal range of conditions. It was written (by me) for that very purpose.

    But most manufacturers intend for the SH...
  41. Your cfm estimates are way off. If you have 0.9"...

    Your cfm estimates are way off. If you have 0.9" static on low what do you think it was on high? Hint: Not 0.9". Way off the chart is were it was.

    When you run static that high there's very...
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    We can't diagnose anything with sparse info like...

    We can't diagnose anything with sparse info like that, but definitely, yes, there's a problem with something. Could be a duct issue.
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    We can't diagnose anything with sparse info like...

    We can't diagnose anything with sparse info like that, but definitely, yes, there's a problem with something.
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    In that case I can't see any reason why they...

    In that case I can't see any reason why they would shift if you leave them disconnected.
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    Was the unit manufactured there? Post a model...

    Was the unit manufactured there? Post a model number. Odds are the RV is energized in cooling mode.
  46. Stressed.

    Stressed.
  47. The coil is probably impacted. Fibers from trees...

    The coil is probably impacted. Fibers from trees such a cottonwood or grass clippings can wrap around the condenser tubes and get lodged in there pretty good. Try a propane torch to burn the stuff...
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    This

    This
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    With high static there will be virtually no...

    With high static there will be virtually no difference in cfm between speed taps on a psc motor.
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    The indoor unit nameplate also.

    The indoor unit nameplate also.
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