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  1. Replies
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    Good point with Trane equipment...I had forgotten...

    Good point with Trane equipment...I had forgotten about the Trane OEM I tried replacing with an aftermarket fit-em-all hard start. Wouldn't consistently work...
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    I've seen start and run caps "explode"...as far...

    I've seen start and run caps "explode"...as far as theorizing why, maybe the relay contacts didn't open, which will usually take out the cap. And then, if you want to theorize why the relay...
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    Still got it wrong, don't you? Absolute...

    Still got it wrong, don't you?

    Absolute atmospheric is 14.7 psi (sea level).

    Atmospheric gauge pressure is zero...any elevation I suppose.

    PSIG = PSIA - 14.7

    But, it rarely comes to me,...
  4. You sure about that? 407C has a pretty hefty...

    You sure about that? 407C has a pretty hefty glide factor.





    What's wrong with that? I like smaller footprints...the increased physical size, due to higher SEER requirements, needs trimming...
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    There's a lesson in that observation...;)

    There's a lesson in that observation...;)
  6. Increasing head is due to low condenser air or...

    Increasing head is due to low condenser air or overcharge.

    If the metering device is fixed orifice, suction will rise along with head pressure.

    If by chance, you were checking in heat cycle,...
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    He had a ≈45˚ coil and ≈10˚ superheat...

    He had a ≈45˚ coil and ≈10˚ superheat...
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    Clamp probes are not the most accurate, if used...

    Clamp probes are not the most accurate, if used as is. I started applying a dab of thermal trap paste on my AK probes.

    With the paste, they read within a degree or two, of a thermocouple...
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    It's not a theoretical value...it's the saturated...

    It's not a theoretical value...it's the saturated temperature for the measured suction pressure.

    Admittedly, it's an accepted approximation of the coil temperature, since the pressure at the coil...
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    ∆T's need to be measured at the air handler for a...

    ∆T's need to be measured at the air handler for a useful number...too many opportunities for heat gain between the return intake and a supply register.;)
  11. Replies
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    That's always a possibility as well, with heat...

    That's always a possibility as well, with heat pumps.



    And I just now saw that...which would indicate something other than the compressor.
  12. Replies
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    The evaporator temp and superheat indicate a...

    The evaporator temp and superheat indicate a fully loaded coil. If there are no return air issues...high wetbulb, duct leakage, etc., slow down the blower motor, if possible.

    For what it's worth,...
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    If the suction is 105 and head 125, in addition...

    If the suction is 105 and head 125, in addition to being low on freon, it ain't pumping.

    :confused:
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    You measure the superheat or suction line temp? ...

    You measure the superheat or suction line temp?

    No thoughts on the ∆T, but for the ID/OD temps, the suction pressure is high, and the head is low...or did you notice?
  15. Replies
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    Your level of curiosity with equipment design...

    Your level of curiosity with equipment design exceeds mine. There are some design aspects I'd like to know more about, but phase equilibria isn't one of them.



    ..or perhaps it's simply because...
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    I still don't have a clue what you're talking...

    I still don't have a clue what you're talking about...:confused:

    Fractionation is a separation process in which a certain quantity of a mixture (gas, solid, liquid, enzymes, suspension, or...
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    I still don't see (or understand) a connection...

    I still don't see (or understand) a connection between that, and your initial post. In the evaporator, one refrigerant phase boils off early, the other a little later, regardless the glide value.
    ...
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    Fractional solubility??? I don't even know...

    Fractional solubility???

    I don't even know what that is...:confused:
  19. The amp draw will increase with increasing OD...

    The amp draw will increase with increasing OD temps and increased head pressure...

    694721
  20. Replies
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    Based on some expanded data for Goodman,...

    Based on some expanded data for Goodman, undercharge is a possibility. Suction should be a little higher, head quite a bit higher and amp draw a little higher.

    But...



    ..something else may...
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    Maybe because it comes up (some question about...

    Maybe because it comes up (some question about some leak sealer) once a week...:grin2:

    Some are fans of leak sealers, some not, and the opinions won't likely change. I did a "Nu Calgon" thread...
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    I've got the 310...cheapest model, and you have...

    I've got the 310...cheapest model, and you have to push buttons several times to toggle through the different screens to see all the numbers.

    The 320 may show them all on one screen...I forget.
    ...
  23. Replies
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    First off, I'd have probably told the chief come...

    First off, I'd have probably told the chief come on out and show me how to do it.:mad:

    I haven't changed many condenser coils, but they were all a much bigger PITA than "A" coils for sure...
    ...
  24. Replies
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    Every now and then, I'll fix the heating/cooling,...

    Every now and then, I'll fix the heating/cooling, then get a call the next day saying "the stove doesn't work now", no doubt due to something I did yesterday...
    :gah:

    If you're the last...
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    And in the future, be sure to replace the fan...

    And in the future, be sure to replace the fan motor or fan blade or blower wheel or capacitor or wire terminal or contactor or limit switch or gas valve or whatever, with an OEM part so you won't...
  26. Replies
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    Why didn't I think of that? :rolleyes:;)

    Why didn't I think of that? :rolleyes:;)
  27. Replies
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    Sequencers not the best idea for furnace blower...

    Sequencers not the best idea for furnace blower on-off timing...need something like in this link.

    Furnace Blower Controls

    If you have local Johnstone, they generally carry blower timer controls.
  28. Replies
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    I don't quite understand the question...gas pack...

    I don't quite understand the question...gas pack or electric heat, or heat pump? Either way, maybe setting "heat" speed to high, would help. The PSC motor probably not moving as much air as the ECM.
  29. BB types faster than me, so some of my comments...

    BB types faster than me, so some of my comments echo some of his...;)



    A system with correct charge and stuck open TXV will of course, overfeed the coil, resulting in lower superheat, higher...
  30. Replies
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    For the record (and nit-picking) base model...

    For the record (and nit-picking) base model numbers don't include the G prefix, which was what initially confused me.

    685961

    However, some Goodman documents will include the G somewhere in...
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    GARUE is not a typical Goodman number. Something...

    GARUE is not a typical Goodman number. Something very new?

    The ARUF model schematics show blue as common...been blue for years. ;)

    But pull the panel to be certain.
  32. Best guess... Assuming the 50 psi (26˚) and 5...

    Best guess...

    Assuming the 50 psi (26˚) and 5 ˚ superheat were measured with a defrosted coil, the problem is low air flow.

    If you're confident the coils are truly clean, then there's...
  33. Replies
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    Weak capacitor terminal connections and...

    Weak capacitor terminal connections and subsequent overheating, could well lead to cap failure.

    But I've never seen (or heard) data supporting a correlation between compressor amps and cap life....
  34. Replies
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    PCB's ;) I don't remember when crappy...

    PCB's ;)



    I don't remember when crappy caps actually became routine in field. It was well after '79 before I began *****ing to wholesalers, and several years afterwards, before somebody...
  35. Replies
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    Excuse me...that is INCORRECT. :oops: :o...

    Excuse me...that is INCORRECT.

    :oops:

    :o For constant head pressure, decreased suction pressure results in an amperage increase, probably due to increased compression ratio.

    If the head...
  36. Replies
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    It's a 10 SEER likely...so head is low for 80˚...

    It's a 10 SEER likely...so head is low for 80˚ OD.

    The oversized coil is a plus. Get the charge (superheat) closer to target and the suction swing will probably improve. ;)
  37. Replies
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    Capacitors are tested to meet certain standards...

    Capacitors are tested to meet certain standards for operating voltage and temperature:

    Capacitor Standard

    If a cap meets the 60,000 hour test, and if the compressor ran 24 hours a day, the cap...
  38. Thread: WTF!!!

    by Saturatedpsi
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    Yeah, and sometimes in my case, it's due to old...

    Yeah, and sometimes in my case, it's due to old age, bad eyesight and failing mental capacity...:grin2:

    Was on a service call yesterday, where the condenser wasn't energizing. The early conclusion...
  39. Thread: WTF!!!

    by Saturatedpsi
    Replies
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    (While I was typing, Mr Kelly posted some of the...

    (While I was typing, Mr Kelly posted some of the same points in this reply)



    The initial info provided was:



    My initial reply was an attempt to make the point a frozen coil screws up...
  40. Thread: WTF!!!

    by Saturatedpsi
    Replies
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    If the superheat is/was high... ..strong...

    If the superheat is/was high...
    ..strong likelihood.
  41. Thread: WTF!!!

    by Saturatedpsi
    Replies
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    You can't diagnose systems with frosted coils. It...

    You can't diagnose systems with frosted coils. It could be either, or something else.

    Get the coil defrosted, then read the numbers and include ID/OD temps if you post back.
    ...
  42. Replies
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    I got lucky with a search and found the thread I...

    I got lucky with a search and found the thread I was thinking about.

    http://hvac-talk.com/vbb/showthread.php?1630901-Strange-refrigerant-behavior&highlight=frosting
  43. Replies
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    Yeah, but he left several hints... I've...

    Yeah, but he left several hints...



    I've seen the entire suction line frost all at once, due to low/no air, but never in the manner he described. :confused:
  44. Replies
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    It's based around or on, "Henry's Law" (who may...

    It's based around or on, "Henry's Law" (who may well be, one of Dalton's 4th or 5th cousins once removed...)



    (courtesy Wikipedia)
  45. Replies
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    Well, it sounded good...:grin2: Still, the...

    Well, it sounded good...:grin2:

    Still, the situation begs the question: why did the frost start one inch downstream of the service valve? The liquid is coming from the evaporator coil, at the same...
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    That's my guess...some liquid coming back from...

    That's my guess...some liquid coming back from the compressor at a saturated temperature/pressure, passing through the service valve where two abrupt 90˚ direction changes take place, resulting in...
  47. Replies
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    Did you measure the superheat when you stopped...

    Did you measure the superheat when you stopped charging at the 27˚-28˚ evaporator temp?
  48. Replies
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    Very nicely articulated...:)

    Very nicely articulated...:)
  49. Additional Info On RLA

    I picked a 410A scroll compressor at random, ZP44K5E, and looked up the specs and performance data.

    The two listed RLA's (depending on the formula used) are 21.4 and 23.9. The performance...
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    That's one of the most illogical correlations...

    That's one of the most illogical correlations I've ever seen...:confused:

    Granted, all capacitors do fail, but some a lot sooner than others. Cheap capacitors are a prime example of "getting what...
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