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  1. #1
    Join Date
    Jul 2005
    Posts
    9
    Hi-

    I am having trouble getting cooling performance out of my brand new Trane units inside and out (installed in November, so quite new).

    I have outside:

    Trane 2TWX4018A 1.5 ton

    and inside:

    Trane TWE018P13

    I had an service man over today and he told me that he thought the units were mismatched, because the refrigrant levels (or actually the pressures and temperatures that he used to look up the level on a curve) measured outside seemed a little high but inside seemed a little low. So my question is, are these units matched okay to one another? Is it okay to use them in conjunction?

    My problem is that I can't seem to get my house cooler than around 73 degrees, when last year before the replacement my house got cool very quickly (1000 sq ft condo, not a big place). Obviously the serviceman checked the coils for dirt, and he checked the refrigerant, but got the readings saying it was too high one place and too low the other. It does use a TXV bulb to restrict the refrigerant flow (I think that is what it does), could that be the problem?

    A complete novice...

    James

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,080
    Originally posted by jostheim
    My problem is that I can't seem to get my house cooler than around 73 degrees
    That's a problem?

    Are you an eskimo?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,347
    That would be a problem for me! I like a frosty 68 at night!

    That is a matched system. Was your previous system 1.5 ton?

  4. #4
    Join Date
    Jul 2005
    Posts
    9

    Wink I do like it cold :)

    BaldLoonie-

    Previous system was a 1.5 ton... thought this new one would work better if anything!

    I like it about 70 at night in my room which is on the lowest floor (and therefore should be the coolest).

    So my setup is standard? My investigations online have sort of said the same thing, i.e. it should work well.

    Jamie

  5. #5
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Do you have a setback tstat that you use during the day?
    How tall are you Private???!!!!

  6. #6
    Join Date
    Jul 2005
    Posts
    9
    Yello Dot-

    Yes I have a digital thermostat that sets back during the day. I used to let it get up to 85 degrees, but now I only let it get to 77 during the day.

    Again, with my old unit getting it back down to 70 wasn't a big problem...

    James

  7. #7
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    That is a big difference to make up esp. when its 100 degrees outside.

    I like my house 74 and only set it to 77 while I'm at work.

    Does setting it to 85 during the day and 70 when you get home save any money? I'd think it would cost more with the extended run times.

    Does your tstat have the adaptive intelligent recovery feature?
    How tall are you Private???!!!!

  8. #8
    Join Date
    Jul 2005
    Posts
    9
    In short, yes it is honeywell with the smart response logic to figure out how early it should come on to recover.

    James

  9. #9
    Join Date
    Jul 2005
    Posts
    9

    more info

    From the work order:

    Subcooling is high (overcharged)
    Supperheat is low (undercharged)

    Equipment may be mismatched. Model #'s need to be checked.

    James

  10. #10
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697

    Re: more info

    Originally posted by jostheim
    From the work order:

    Subcooling is high (overcharged)
    Supperheat is low (undercharged)

    Equipment may be mismatched. Model #'s need to be checked.

    James
    If that is what he wrote down, you'd better change servicemen.

    High subcooling and low superheat indicate an overcharge. Low subcooling and high superheat indicate an undercharge.

    Did he include any numbers?

    [Edited by Panama on 07-14-2005 at 12:39 PM]

  11. #11
    Join Date
    Jul 2005
    Posts
    9
    here is exactly what he wrote:

    Make MOdel
    Trane 2TWX4018A1000AA
    Trane TWE018P130B0

    Description of Work Performed

    Check out A/C not cooling well
    Found system pressures ok with press curv.
    Sub cooling is high (overcharged)
    Supper heat is high (undercharged)

    Equipment may be mismatched Model #s
    need to be checked.

    And woops, I screwed up writing it below (from my head, always consult the paper, what a dummy I am!). That is a big my fault!!!!

    James

  12. #12
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,347
    That is a matched system!

    I only let my place get 3 degrees warmer during the day. More than that and I can't have it bitterly cold by bedtime. A/C units are good at maintaining but it is murder to get them to drop the temp much in hot weather, especially if humidity leaked in during the day.

    No idea why your past 1.5 ton unit didn't have any trouble. Sounds like you need a more experienced tech to find out why it isn't cooling well.

  13. #13
    Join Date
    Jul 2005
    Posts
    9
    Thanks everyone for the help! From here:

    http://www.longviewweb.com/r22b.htm

    I see that maybe it is:

    Restriction in refrigerant circuit. Look for significant temperature difference at point of restriction. Possible incorrect orifice pin (too small) or TXV stuck closed.

    or

    Excessive loading of Evaporator coil. Due to excessive air flow across coil or open return duct in unconditioned space. Check blower speed tap setting (too high) and return duct for leakage.

    My blower has 2 settings and it is on the high one... I never thought that would be a problem...

    James

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