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  1. Replies
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    Most of the time, you can cycle the unit off and...

    Most of the time, you can cycle the unit off and just watch the pressures...if they equalize fairly quickly (2-3 minutes), it's piston. If not, TXV.
  2. For PSC condenser motors, ball bearing is all I...

    For PSC condenser motors, ball bearing is all I buy...I haven't had any bearing failures with them. With sleeve bearing motors, the bearings were the first thing to go...:rolleyes:
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    For experimental/trial and error purposes, it...

    For experimental/trial and error purposes, it should work well enough...may "hunt" a little. But it'll eliminate a possibility.
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    [/FONT] Reduced airflow may improve...

    [/FONT]





    Reduced airflow may improve the superheat but the head pressure and subcooling numbers are still high...you had already checked and cleaned the orifice. Good possibility the...
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    With that said...I'll go out on the limb. If...

    With that said...I'll go out on the limb.

    If it was my problem system and based on the info provided, I'd conclude the new TXV is the issue...
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    I don't know...as already stated, if the head...

    I don't know...as already stated, if the head started at 225/110˚/OD + 20˚, it would have had to gone lower with the low suction as no or little refrigeration was taking place. The amount of gas...
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    Strange...I would have expected the SH to drop at...

    Strange...I would have expected the SH to drop at 80 psi suction. One thought...I'm assuming there's no ductwork, which would eliminate a lot of external static and the blower would move more air. If...
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    Yeah...my "crystal ball" is broke, how 'bout...

    Yeah...my "crystal ball" is broke, how 'bout yours? :grin2:
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    All I have are more questions than...

    All I have are more questions than suggestions...assuming the OD was ±90˚, the heat cycle head pressure would have been more than 225 psi. You didn't say what the heat cycle suction pressure was so...
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    That link didn't go anywhere...???

    That link didn't go anywhere...???
  11. I heated some tubing with 22 in it...the 22...

    I heated some tubing with 22 in it...the 22 cooked to a black residue, maybe worse than the oxides.
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    The cool cycle numbers aren't bad...in fact...

    The cool cycle numbers aren't bad...in fact pretty good. Evaporator temp 42˚ and condensing temp 102˚, which is OD + 22, which is pretty close to the design condenser split/TD/CTOA.

    The design...
  13. I'll go along with that...more often than not, I...

    I'll go along with that...more often than not, I stick it all together, purge, then braze.
  14. There are no doubt countless residential and...

    There are no doubt countless residential and commercial systems that have apparently survived the absence of nitrogen purging during the initial installation. I wouldn't, however, go so far as to say...
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    Manual D explains how and why the system TEL...

    Manual D explains how and why the system TEL won't necessarily be the runout with the longest linear length.

    For example, the first of 6, 10' foot runouts on a 10 foot trunk has a +80 feet TEL...
  16. I looked at the report numbers and still don't...

    I looked at the report numbers and still don't know what the 908 cfm is referencing...and can't find any assistance via Google. You'll have to inquire with the folks who designed the app.

    But we...
  17. Unless it's "air changes per hour"... Air...

    Unless it's "air changes per hour"...

    Air Change Chart
  18. It's been decades since I messed with Manual J...

    It's been decades since I messed with Manual J and my copy of Manual J is decades old...but I don't remember the calculations ever specifying a total cfm value. It was just heat loss and heat gain...
  19. His problem/question is not being able to find a...

    His problem/question is not being able to find a furnace that will deliver 900 cfm for heat and 600 for cooling.
  20. Replies
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    There are varying degrees of "right." :grin2: Not...

    There are varying degrees of "right." :grin2: Not as much variation if you're a perfectionist...;)

    All the numbers you have posted don't indicate a "chronic" airflow issue...if the best you could...
  21. Replies
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    ..been two weeks since your original post. Is it...

    ..been two weeks since your original post. Is it still frosting up? Every day or just sometimes?
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    R2A360GKR2 I was bettin' on 36... :grin2:

    R2A360GKR2

    I was bettin' on 36... :grin2:
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    Two or three or four years ago (who can...

    Two or three or four years ago (who can remember?) there was a long discussion about low load vs low superheat with TXV metered coils. I kept arguing low air wouldn't cause low superheat and was...
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    You made the right call relative to the TXV... ...

    You made the right call relative to the TXV...

    There likely is an airflow problem explaining the 29˚ coil but the TXV should maintain the superheat setting if it's working right. Once you get a...
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    I've seen weak pumps running 60˚ saturated...

    I've seen weak pumps running 60˚ saturated evaporator temps but never seen one at 75˚. That's a 1.2 compression ratio...with the higher efficiency stuff, 2.0 is about as low as you see...a heat pump...
  26. One of my "Top 3" pet peeves...people buying old...

    One of my "Top 3" pet peeves...people buying old houses and wanting new house condition. The HO threats may be just that...empty words to intimidate everybody. And if he thinks somebody owes him...
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    For me, always deactivated. From the manual:...

    For me, always deactivated.

    From the manual:



    So, the compensating factor is supposed to improve accuracy of tubing (surface) measurements but in my experience with Testo stuff, it didn't,...
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    Zeroing out Testo 550

    Wrong quote: relative to the temp sensor question...


    They have a “surface compensation” factor that has to be turned off on each power-up.

    See page 12 of the user manual. You can Google to...
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    The OP's numbers showed 75˚ suction line and 137...

    The OP's numbers showed 75˚ suction line and 137 suction pressure which is 77˚ saturated...that's negative 2˚ superheat, assuming no errors in measurements. So, some liquid was "flashing".

    I've...
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    I got to think about that a while...:confused: ...

    I got to think about that a while...:confused: :grin2:
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    More likely something happened to make it frost...

    More likely something happened to make it frost up, and resulting zero superheat screwed up the pump...or just a coincidence. :confused:
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    I overlooked that little detail...:grin2:

    I overlooked that little detail...:grin2:
  33. Replies
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    I've started up quite a few new systems that...

    I've started up quite a few new systems that overfed...they were non-adjustable valves so no options. But all those I remember fixed themselves after a day or two's operation.

    I don't know enough...
  34. Well you can't win 'em all...;) When I do win, I...

    Well you can't win 'em all...;) When I do win, I credit it to luck and just livin' right...and then, mostly luck. :grin2:
  35. I went on an old Trane unit once (back when they...

    I went on an old Trane unit once (back when they actually were hard to stop) that had been left "ON" for three days, running essentially in a vacuum due to loss of charge. The compressor eventually...
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    The evaporator is flooded and the other...

    The evaporator is flooded and the other technician gave you bad advice. :rolleyes:

    But since the other guy said charge to subcooling, we'll assume the evaporator has a TXV, in which case the...
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    And that degree of help seems to vary from day to...

    And that degree of help seems to vary from day to day, post to post...:confused:

    The only quantitive definition I've seen is something like "if a discussion goes to far"...how far is "too far?"...
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    LMAO...Now, that's ha-ha funny. :LOL:

    LMAO...Now, that's ha-ha funny. :LOL:
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    The story I heard was the "shortage" is...

    The story I heard was the "shortage" is manufactured by the manufacturers...they just want to get the price up. It's a supply vs demand thing...:rolleyes:

    Some dude dumped a bunch of cheap,...
  40. Replies
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    TXVs compare the evaporator temperature to the...

    TXVs compare the evaporator temperature to the suction line temperature and maintain a warmer suction line by some amount, say 10˚ or 15˚...when they're working right. Of course, they do that by...
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    Based on some information I found for that model,...

    Based on some information I found for that model, the motor is a "high efficiency" ECM (?). The other motor options for other models are ECM and Variable speed. Got no clue what the difference is...
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    That's Rule #1... Refer to Rule #1... ;)

    That's Rule #1...



    Refer to Rule #1... ;)
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    With the equipment service literature I've seen,...

    With the equipment service literature I've seen, the curves aren't intended to be a target value method for charging, just a guideline that might help in evaluating the system charge.

    But in the...
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    Superheat and subcooling are never ever...

    Superheat and subcooling are never ever irrelevant in system analysis...;)
  45. Replies
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    If we assume (ass-u-me) the system wasn't...

    If we assume (ass-u-me) the system wasn't frosting up with the old air handler, then logic would suggest there's something about/with the new air handler causing the issue...as Knave already...
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    I'm still reading...but what's the air handler...

    I'm still reading...but what's the air handler model number?
  47. Replies
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    You got resources to buy TXV's every week? ...

    You got resources to buy TXV's every week? :grin2:

    Just messin' with you...;) I'm going to read all the posts again.
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    Ain't nothing wrong with the TXV... Do you...

    Ain't nothing wrong with the TXV...

    Do you have any idea what temp the owner is trying to cool the house? Do they lower the set point at night?

    Are they running high resistance filters?

    Are...
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    Needless to say, a 38˚ coil won't frost...but...

    Needless to say, a 38˚ coil won't frost...but that's with 78˚ return temp which reflects some degree of low airflow. Something's going on after you leave. Maybe low set point or blower glitch. It...
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    For the record...the vacuum lowers the boiling...

    For the record...the vacuum lowers the boiling point temperature of the water. The heat of vaporization necessary for the phase change comes from the sensible heat within the water. After enough time...
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