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  1. #27
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    Jun 2019
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    Quote Originally Posted by NETWizz View Post
    Did they run a leak search on the coil? TXV units can usually be changed without replacing the evaporator coil is why I am asking... but only after a proper diagnosis is it with doing because that repair involves dealing with refrigerant.

    Regardless evap and TXV or TXV only you are looking at a lot of other tasks...
    Pump down, Recovery, replacement, New Drier filter, evacuation, and either a full dry startup or release from pump down. Either way you would expect to pay for refrigerant unless your plan covers it, and that can be almost none all the way up to the full nameplate plus some for line-set length!
    So the CE tech just left. He said the fan was spinning weird and shutting down because the unit has high and low pressure sensors in it. He said the copper line going into the outdoor unit was getting ice on it, and when the ice would form in it enough it'd freeze the line and trip the low pressure sensor because the line pressure was low and that would subsequently shut the fan down. I touched it and it was very cold. He said it was reading at 25F and it should be reading around 50F. He said a new unit including labor would be $ to replace the A-Coil (again, labor included). I asked about the TXV and he said you'd have to replace the entire evaporator coil and couldn't just do the TXV by itself.

    He said I could keep running it but the line would eventually freeze again and I'd have to shut the unit down and let the line cool off because the pressure switch would trip.

    I do plan on calling out a local HVAC company when I return from my vacation in a week so I can get a second opinion.
    Last edited by Dad; 06-24-2019 at 02:50 PM.

  2. #28
    Join Date
    Aug 2002
    Location
    Southold, NY
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    22,305
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    God
    I need my waders!

  3. #29
    Join Date
    Jan 2014
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    New England
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    If it's a low SEER unit...why do you have to use a TXV if it's easily removal/install and not a simple troublefree piston metering device as another option?

    Send a picture of your coil and metering device..

  4. #30
    Join Date
    Jun 2019
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    17
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    Thread Starter
    Quote Originally Posted by Bazooka Joey View Post
    If it's a low SEER unit...why do you have to use a TXV if it's easily removal/install and not a simple troublefree piston metering device as another option?

    Send a picture of your coil and metering device..
    I'm assuming the condenser coil? The evaporator coil is unfortunately closed off. There's no access door so I can't see the coil or metering device.

  5. #31
    Join Date
    Mar 2018
    Location
    Chico, Ca #StateofJefferson
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    701
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    I can smell the BS from here. Danger Will Robinson! Hacks have infiltrated your home! FYI there’s a number of other things besides a txv that will freeze up a evap coil

  6. #32
    Join Date
    Dec 2009
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    maroon lazyboy
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    Quote Originally Posted by Makeitcold View Post
    I can smell the BS from here. Danger Will Robinson! Hacks have infiltrated your home! FYI there’s a number of other things besides a txv that will freeze up a evap coil
    Lol. Yes I agree it is likely something other than expansion valve.

  7. #33
    Join Date
    Jun 2019
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    Well, I had a guy from a reputable A/C company come out today to check the system. As most of you had said, the original guy from the consumer energy company was BS'ing me. The guy who came out today was awesome and explained everything to me as he was doing it, and explained what the issue was. He said the guy from the CE company had undercharged our system with only the factory amount listed on the unit. He said more refrigerant needed to be added to level out the superheat and pressure levels because the refrigerant lines ran pretty far, and that they were unbalanced from the amount the guy had put in. He said because the system was undercharged it caused the line to freeze and shut the unit down, and that the issue was not the coil or TXV. He measured the distance from the line to the outdoor unit and put in the correct amount of refrigerant in until everything was balanced then let it run for a half hour to make sure the balance stayed consistent.

    Afterwards he checked every vent in the house to make sure it was blowing cold air sufficiently. Everything seems to be working great now!

  8. #34
    Join Date
    Jan 2014
    Location
    New England
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    Where did he measure the distance from the line to the OD unit? starting at the indoor coil? As typically the factory charge in the OD unit initially is good for a matching indoor coil and a set footage of correctly sized line set, every foot over that initial footage you add a predetermined amount, then due to having a TXV, the tendency is to charge to manufacture subcooling. Certainly the superheat can be a factor in charging.

    What did the invoice say in regards to how much refrigerant was added and the total line set run, was that part mentioned in the invoice?
    Last edited by Bazooka Joey; 06-24-2019 at 01:10 PM.

  9. #35
    Join Date
    Jul 2014
    Location
    West Columbia, SC
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    290
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    How many pounds low were you? Did the tech use a scale? Did the tech check the line temperatures in addition to pressures?


    It’s great it was such a simple fix. Recharging a unit is about the easiest thing in the world to do. It’s crazy the ace guy didn’t gas it up.

    ********

    Your first post said line froze up, which can happen when low on charge or low airflow over the indoor coil. Somewhere above someone was talking about liquid coming back... this would generally require an overcharge condition.

    An undercharge as you describe would have low sub-cooling, and high-superheat being the TXV cannot maintain superheat without liquid refrigerant begins it. Pressures all around would be low as would he respective saturated temperatures. It’s a lot of technobabble where I am saying, “I don’t see how a simple under-charge could be missed.”

    Did the tech provide you with any metrics?

    At any rate, send he bill to the CE or HW company... See if they will reimburse you.

  10. #36
    Join Date
    Jun 2019
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    Thread Starter
    Quote Originally Posted by Bazooka Joey View Post
    Where did he measure the distance from the line to the OD unit? starting at the indoor coil? As typically the factory charge in the OD unit initially is good for a matching indoor coil and a set footage of correctly sized line set, every foot over that initial footage you add a predetermined amount, then due to having a TXV, the tendency is to charge to manufacture subcooling. Certainly the superheat can be a factor in charging.
    Yes he measured starting from the coil to the outdoor unit.

    Quote Originally Posted by NETWizz View Post
    How many pounds low were you? Did the tech use a scale? Did the tech check the line temperatures in addition to pressures?


    It’s great it was such a simple fix. Recharging a unit is about the easiest thing in the world to do. It’s crazy the ace guy didn’t gas it up.

    ********

    Your first post said line froze up, which can happen when low on charge or low airflow over the indoor coil. Somewhere above someone was talking about liquid coming back... this would generally require an overcharge condition.

    An undercharge as you describe would have low sub-cooling, and high-superheat being the TXV cannot maintain superheat without liquid refrigerant begins it. Pressures all around would be low as would he respective saturated temperatures. It’s a lot of technobabble where I am saying, “I don’t see how a simple under-charge could be missed.”

    Did the tech provide you with any metrics?

    At any rate, send he bill to the CE or HW company... See if they will reimburse you.
    He added 1lb of refrigerant to the unit. And yes, he checked the temperature and the pressures for the unit. He monitored them for about 30 minutes to make sure everything stayed balanced.

    He also explained everything to me as he was doing it and was showing me the meters and pressure gauges he was using, as well as explaining what the levels should appear as on it. When he first measured it he said the pressures were coming back low and that the superheat was high. He said the exact same thing as you basically, that he didn't understand how the last guy didn't realize the system was undercharged.

  11. #37
    Join Date
    Jan 2014
    Location
    New England
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    I come up with approx 40’ total line set give or take if he actually added 1 lb. that one lb could be what he charged you and not actually what was added. Sounds like he got the charge pretty close thou. Hopefully all is well with your system moving forward. It’s not like your going to bill a customer for 12.5 ounces that was actually added as an example. It gets rounded off.

  12. #38
    Join Date
    Jun 2019
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    Quote Originally Posted by Bazooka Joey View Post
    I come up with approx 40’ total line set give or take if he actually added 1 lb. that one lb could be what he charged you and not actually what was added. Sounds like he got the charge pretty close thou. Hopefully all is well with your system moving forward. It’s not like your going to bill a customer for 12.5 ounces that was actually added as an example. It gets rounded off.
    Yep, you got it exactly! He measured it to about 40 feet. It seems to be running great for now and I was really happy with the guy and the work he did. The price was extremely reasonable too.

  13. #39
    Join Date
    May 2004
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