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  1. #14
    Quote Originally Posted by beenthere View Post
    From our site rules.

    3. No pricing questions please

    Only people who actually see your job can price it accordingly. There will be no pricing allowed in the public access areas of this site. Please do not ask for or give pricing comparative information.
    Posts of this type will be deleted.

    Please read our site rules, thank you.
    Thanks for the heads up, won't happen again!

  2. #15
    Join Date
    Jan 2012
    Location
    indy
    Posts
    471
    A lot of residential guys are briefly trained and sent out on their own, commercial not so much. So if their not purposely ripping you their just incompitent. Find someone that works for a company that might help you on the side they might be more help

  3. #16
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,453
    Quote Originally Posted by moparman915 View Post
    Do all units come with a piston, fixed orfice or TXV? Does it have to have at least one of the three to function...?
    A piston is a fixed orifice. All ac's have a metering device to flash liquid refrigerent to begin the change of state from liquid to vapor thus removing the heat from the air in the process. The 3 types of metering devices are a capillary tube(old ac's have these) , txv, or piston (fixed orifice). Some higher end equipment will have an electronically controlled expansion valve (exv).

  4. #17
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,300
    Quote Originally Posted by moparman915 View Post
    Added 5 lb 1 oz of R-22
    Oh my!

    If it needed that much refrigerant, you have a significant leak! And a leak that should be repaired pronto! If you have no leak, that system is now most likely seriously overcharged! Which is never good.

    Which contractor is this invoice from? #3?
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  5. #18
    Join Date
    Jan 2012
    Location
    indy
    Posts
    471
    Quote Originally Posted by moparman915 View Post
    Do all units come with a piston, fixed orfice or TXV? Does it have to have at least one of the three to function...?
    yes its one of four must have components. Compressor, metering device, evapoator, condenser

  6. #19
    Quote Originally Posted by Shophound View Post
    Oh my!

    If it needed that much refrigerant, you have a significant leak! And a leak that should be repaired pronto! If you have no leak, that system is now most likely seriously overcharged! Which is never good.

    Which contractor is this invoice from? #3?
    This was from contractor #3 when he did the evacuation of old refrigerant and replaced it with 5 lbs of R-22. The process, BTW, included removal of the old/contaminated R-22, purge with nitrogen (or something like that) and vacuum to 500 microns. Then he replaced it after finding no leaks.

  7. #20
    Quote Originally Posted by moparman915 View Post
    This is some information I found on the invoice about my A/C unit:

    Furnace
    Model Number
    # L1RA054c-12a

    Make: Nordyne
    Model: FS3BA-036KA ( 3 ton unit; manufactured by Frigidaire in 2003 according to a Google search)

    Suction 71
    Line Temp 65
    Sat Temp 42
    Super Heat 23
    Liquid 268
    Line Temp 110
    Sat Temp 122
    Sub Cool 12
    Amb Temp 94or44
    R-A Dry Temp 80
    S-A Dry Temp 63
    Temp Rise 17
    Added 5 lb 1 oz of R-22
    Can anyone make sense of these numbers? Are they within normal limits and can they illustrate any potential problems?

  8. #21
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,300
    Quote Originally Posted by moparman915 View Post
    This was from contractor #3 when he did the evacuation of old refrigerant and replaced it with 5 lbs of R-22. The process, BTW, included removal of the old/contaminated R-22, purge with nitrogen (or something like that) and vacuum to 500 microns. Then he replaced it after finding no leaks.
    Ah, I see. Easy to lose track of what's been said in these threads. You did mention the above.

    That said, #3 did all that but never looked for trash in the piston? He sounds promising but needs to push his diagnostic envelope further.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  9. #22
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,765
    The readings aren't out of line. but would need to know indoor wetbulb to know if they are ok.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  10. #23
    Join Date
    Mar 2004
    Location
    Des Moines, Iowa
    Posts
    147

    Smile

    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 10-04-2012 at 04:23 PM. Reason: Non Pro * Member

  11. #24
    Join Date
    Mar 2004
    Location
    Des Moines, Iowa
    Posts
    147
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 10-04-2012 at 04:23 PM. Reason: Non Pro * Member

  12. #25
    Join Date
    Aug 2012
    Posts
    2,594
    Quote Originally Posted by hvacmike85 View Post
    A lot of residential guys are briefly trained and sent out on their own, commercial not so much. So if their not purposely ripping you their just incompitent. Find someone that works for a company that might help you on the side they might be more help
    X2
    From your description you are definatly suffering from lack of experience. Something is causing the coil to freeze and it is definatly not a capacitor on the outdoor unit. Did they replace the Blower motor capacitor, or check the operation of it or see if your indoor coil is cleaned?

  13. #26
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,300
    Quote Originally Posted by moparman915 View Post
    Can anyone make sense of these numbers? Are they within normal limits and can they illustrate any potential problems?
    I plugged your invoice data into my Android phone app "HVAC Buddy", assuming a 67 degree wet bulb for that missing data above. It returned a verdict of "high superheat" and stated possible causes as "undercharge (leak) or restriction".

    So there you go. An app on a smart phone reached the same conclusion I and other techs here have. How 'bout that?
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

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