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Type: Posts; User: udarrell

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  1. I have NOT seen anything actually indicating that...

    I have NOT seen anything actually indicating that the compressor is bad...!
    Reread my #3 post. A lot of good compressors are falsely condemned.
  2. Contractor B diagnosed the problem this morning...

    Contractor B diagnosed the problem this morning after spending an hour replacing the capacitor, cleaning the coils, adding gas "trying some other things". This service tech advised the compressor...
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    You listed the cu.ft of air volume at 2000 it...

    You listed the cu.ft of air volume at 2000 it should have been 20,000 according to dan sw fl.
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    You could replace with a dry nitrogen filled...

    You could replace with a dry nitrogen filled condenser coil that works with either R-22; or low cost R-407C.

    R-407C is a low cost R-22 replacement; add a little POE oil & charge to the weight of...
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    Hey, PROs where are you...? You don't have...

    Hey, PROs where are you...?

    You don't have enough required test data to make an evaluation...
    Could be a small return-air leak from a hot humid attic.

    Check temp at return-air grille & at...
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    If the humidity shoots back-up soon after A/C...

    If the humidity shoots back-up soon after A/C shuts-down it would seem to indicate too much humid air infiltration; perhaps even from the attic area...?

    What type of filters are you using?
    What...
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    Well, subcooling is listed at 17F & you are...

    Well, subcooling is listed at 17F & you are getting 29.
    You can get both high SH & SC with a mild restriction in the refrigerant system...usually though humidity is not well controlled.

    Of...
  8. If you're willing to collect a little simple easy...

    If you're willing to collect a little simple easy data...some clues may be revealed.

    This is a check to see how the system is performing in respect to its
    'Nominal Rated Btuh' you need at least...
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    Never oversize; NEVER...! They won't do a...

    Never oversize; NEVER...!

    They won't do a load-calc; you do it.
    http://www.loadcalc.net/ & SIZING... get others to help you.

    You did a lot to lower the heat-gain rate of your home; the...
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    You thinking is on-target... The measured open...

    You thinking is on-target...
    The measured open area under the grille ought to be equal to the measured open area of the Grille.
    If it is too small it will only be pulling air mainly through a...
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    Do a Load-Calc & run the test I provided....

    Do a Load-Calc & run the test I provided.
    http://www.loadcalc.net/

    If you do change-out the system, don't oversize it...!
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    Was the condenser fan still running full speed...

    Was the condenser fan still running full speed when the compressor went off on thermal OL?

    Head pressure seemed high, but don't have the other needed data...!

    Is the condenser coils & fins...
  13. Measuring airflow is extremely important; far too...

    Measuring airflow is extremely important; far too many never check airflow.
    As our Global Moderator stated; a 3-ton air handler on a 4-Ton unit is not going to work.

    I am not a fan of the high...
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    The Tech's should be using superheat & subcooling...

    The Tech's should be using superheat & subcooling to troubleshoot the systems.
    Unless the indoor humidity is real high a 14F temp-drop between RA & SA is not enough; at around 50% RH it should be...
  15. It appears there may be low indoor airflow. Is...

    It appears there may be low indoor airflow.
    Is it set on high speed?
    What type of filter used & filter box area?

    At 84F & say 50% RH indoor temp-drop could be around 22F; but I still believe...
  16. you may be getting a lot of air infiltration of...

    you may be getting a lot of air infiltration of very high humidity Outdoor air causing some of the low indoor split. However, a lot of that split could be due to lack of insulation on the ductwork in...
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    Might be low on refrigerant... If low, they need...

    Might be low on refrigerant...
    If low, they need to find & fix the leak(s)...

    Do some easy safe temp testing on your own to see if it's way under-performing:

    This is a check to see how your...
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    System could be over-charged or fan out of...

    System could be over-charged or fan out of balance, etc.
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    There ought to be a way to get the incompetents &...

    There ought to be a way to get the incompetents & lairs out of the industry... it is beyond sad...
  20. Thread: Blake

    by udarrell
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    862

    It takes close to 7 minutes to get up to full...

    It takes close to 7 minutes to get up to full operating Btuh plus it does NOT have time to dehumidify; coil is just starting to be cold enough if system was installed RIGHT.

    The system could NOT...
  21. I'd probably add insulation; make sure a good...

    I'd probably add insulation; make sure a good vapor barrier is properly installed & infiltration is to a minimum.

    The system is probably not delivering enough air to & from the MBR.
    Do what ever...
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    A two and half ton air conditioner on 1200-sf...

    A two and half ton air conditioner on 1200-sf with good insulation low air infiltration, and new windows should handle the heat-load okay.

    I doubt that it is a compressor problem as there are...
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    This post pertains only to a non-staged A/C... ...

    This post pertains only to a non-staged A/C...

    The continuous 5 hours running is only correct if unit was sized to the design conditions...!

    Most units are tonnage OVERSIZED way more than...
  24. I doubt very much that it is the compressor...

    I doubt very much that it is the compressor that's bad...I would NOT let them change it out yet...!

    The indoor temp-drop from Return grille to supply diffuser is mainly affected by the indoor...
  25. Thread: New AC Blues

    by udarrell
    Replies
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    2,228

    WOW! how can so many mess-up so bad...? We as...

    WOW! how can so many mess-up so bad...?

    We as HVAC Contractors are paid to analyze everything & explain what the existing problems are & HOW those problems can & must be fixed to achieve decent...
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    Well; no one tested the delivered performance of...

    Well; no one tested the delivered performance of the air conditioner; therefore, U don't know if it is underperforming &/or WHY it's underperforming.

    This is a simple easy totally safe test U can...
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    I know it's a very slim chance but unusual things...

    I know it's a very slim chance but unusual things occurring are possible & can happen.
    It is extremely rare that a PRO Tech would have this happen to verify that strange things can & do happen
  28. Hopefully adjusting the airflow will get the...

    Hopefully adjusting the airflow will get the evaporator coil at or below 45F; 40F would be better.

    If it has a TXV metering device (IMO) I would monitor the indoor temp-drop & coil temp & try...
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    One of the heat pump check valves maybe either...

    One of the heat pump check valves maybe either sticking open or closed.
    The old style check valves were the worst for sticking, the new ball-type not so bad.
  30. Replies
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    One possibility is that during the off cycle...

    One possibility is that during the off cycle something may have Gotten below the piston and wedged some way so that the piston would not seat allowing liquid refrigerant to bypass it.

    That...
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    In any climate where humidity is a problem I...

    In any climate where humidity is a problem I would rather have my A/C slightly undersized.

    In many climates there will be very few hours at summer design or above; the vast majority of cooling...
  32. You charge a TXV, of course, using sub cooling;...

    You charge a TXV, of course, using sub cooling; however, if the TXV is NOT controlling the SH at its setpoint & is totally flooding the evap-coil it can no longer change state 'boil' to absorb heat...
  33. All systems ought to be commissioned; that is...

    All systems ought to be commissioned; that is determining how much of the system's Rated Btuh at specific conditions is delivered to and the amount of sensible & latent heat is removed from the...
  34. Okay it's okay; so you couldn't do anything...

    Okay it's okay; so you couldn't do anything cost-effective to your home to make a 3.5-Ton work?

    If it were my home in a high humidity climate & they used 75F & 50% RH indoors I'd still install a...
  35. You cannot go by whether the existing A/C...

    You cannot go by whether the existing A/C struggles; A/Cs only average less than 60% of their Btuh Rating delivered to the conditioned areas.

    Get some good load-calcs performed & Size...
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    889

    I always used to mark a blade or make a note so I...

    I always used to mark a blade or make a note so I knew what height to remount the fan/blades.

    Tell use how it is mounted now in relationship to the shroud.

    It can be mounted where it might...
  37. Replies
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    Is it mounted in the proper height position to...

    Is it mounted in the proper height position to the shroud?

    Are you sure the new motor calls for 5mfd & does the cap test good?
    Are there any conductor voltage drops anywhere?

    I am also...
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    You are on the ball & correct...! Everyone...

    You are on the ball & correct...!
    Everyone should have an indoor humidity gauge so they know what the indoor temp-split should be. We don't know if it is low airflow or low indoor humidity causing...
  39. Replies
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    There is no way it should be getting a 23F...

    There is no way it should be getting a 23F indoor temp-drop; it has very low airflow with perhaps other problems.

    The static should be checked on the duct system & any problems resolved.
    ...
  40. The inlet screen to the TXV could be partially...

    The inlet screen to the TXV could be partially plugged; we used to be able to access & clean them to restore to working condition...
  41. That is the normal operation of a thermostatic...

    That is the normal operation of a thermostatic expansion valve, it holds the suction pressure and the superheat Close to the same level while the high-side pressure will increase when you add...
  42. It is the responsibility of the contractors...

    It is the responsibility of the contractors technician to explain by diagnostic testing precisely what is causing the problem.

    There may be other factors that are causing the compressor to draw...
  43. Did either technician have a new digital manifold...

    Did either technician have a new digital manifold gauge that showed the superheat and sub cooling in real-time?

    The TXV and the coil may not be bad, there may be a restriction somewhere in the...
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    1,125

    pacnw, though they don't, Goodman ought to list...

    pacnw, though they don't, Goodman ought to list SC on the tag; I had to find the Design subcooling ARI @95F Conditions on their Expanded Performance Data.

    A 14-SEER GSC Model 1.5-Ton SC was...
  45. Replies
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    1,125

    If a TXV metered system the tag usually shows the...

    If a TXV metered system the tag usually shows the target sub cool numbers. Looks like a 16-SEER; some of them have a 7F sub cool +/- 2F.

    If that were true the unit would be overcharged at 14.6...
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    1,728

    The 2.5-Ton should be plenty big enough for your...

    The 2.5-Ton should be plenty big enough for your 1400-sf home.
    The duct system & equipment may need a lot of testing & work.

    Probably all kinds of problems that need addressing...
  47. The thermostat appears to have a on/off...

    The thermostat appears to have a on/off temperature differential setting. Is it a Swing setting or cycles per hour (CPH) setting?

    Are you perfectly comfortable during the entire off portion of...
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    SH & SC can be used to help trouble-shoot a...

    SH & SC can be used to help trouble-shoot a system; more so with a piston than with a TXV.

    Troubleshooting is a matter of using temperature differentials; after retirement, I've used temps for SC...
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    Sounds like maybe the unit was sized too big, as...

    Sounds like maybe the unit was sized too big, as first low-stage does not run long enough & kick back on soon enough.

    How much temp variation is there before it cycles back-on?

    Was a LoadCalc...
  50. IMO; You got the better compressor, add a TXV...

    IMO; You got the better compressor, add a TXV metering device & I like that even better...
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