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  1. #27
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,398
    I would gather these were on York products, Gary?

  2. #28
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,475
    Worries me a bit ive been setting a ton of York for the past 6 months. No problems so far except for one dry charge that had a leak right out of the box. Tiny nick in the channel which they quickly shipped any paid 4 hrs labor for me to replace

  3. #29
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    2,858
    Quote Originally Posted by BaldLoonie View Post
    I would gather these were on York products, Gary?
    yes - about 3 years old
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  4. #30
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    4,661
    Quote Originally Posted by gravity View Post
    I stand beside gary on this one.
    I think I'm leaning that way too.

    Goodman came out with their "smart coil" "technology" making it more "efficient". Aka, cheaper, and harder to charge.

    *sigh*

    The thing that worries me, is the size of the internal channels. Anyone here have blocked cap tubes?

    I see microchannel coils as nothing other than a long series of cap tubes, due to the size of the internal channels.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  5. #31
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    2,858
    Another negative is that they don't recommend pumping units down with microchannel condenser coils either.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  6. #32
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    20,265
    That evap looks like an atomotive radiator or condensor coil...
    GA-HVAC-Tech

    Galatians 2:20-21; Colossians 1: 21-22 & 26-27; 3:1-4; Romans Ch's 5-6-7-8

    2 Chronicles 7:14

    Quality work at a fair price with excellent customer service.

  7. #33
    Join Date
    Feb 2010
    Location
    Ohio
    Posts
    562

    Hmm

    Quote Originally Posted by garyed View Post
    Another negative is that they don't recommend pumping units down with microchannel condenser coils either.
    So we have to recover the refrigerant to repair a leaking lineset? Do they still come pre-charged?

  8. #34
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,384
    I'm pretty sure if you tried to pump the unit down, the condenser coil wouldn't have enough volume to hold all the refrigerant. you might be able to pump some of it down.

    I have also heard these units are critical charge. if there overcharged by 6oz they can trip on high head.

    This just isn't a good thing with all the non-skilled hvac guys that dont know how to properly charge a unit and gauges/temp clamps that havent been calibrated for years.

  9. #35
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    5,821
    They got in there somehow.

    I think if u were to add any then it wouldn't fit in.

    I also think they say don't do it because it would be easy to completely fill the condensor and then be in danger of rupture with expansion just like overfilling a cylinder.

  10. #36
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,384
    Quote Originally Posted by SBKold View Post
    They got in there somehow.

    I think if u were to add any then it wouldn't fit in.

    I also think they say don't do it because it would be easy to completely fill the condensor and then be in danger of rupture with expansion just like overfilling a cylinder.
    good point.

    looks like i gotta carry around extra britches and some wipes when these things really hit the market

  11. #37
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,197
    Quote Originally Posted by ChrisTechMech View Post
    Do they still come pre-charged?
    I have been installing Nordyne units with microchannel condensers for 3 years now and have not had a single problem with them except that in the beginning they were coming shipped with very little refrigerant in them. Some only had vapor. I was concerned that they had leaks. Tech support assured me the problem was they were having trouble getting the full charge into the microchannel coil at the factory.

    I filled them up and there were no leaks. They apparently figured out how to jam all the refer in now because they seem to be shipping with something at least close the nameplate charge.


    I have not had to pump one down yet, but I suspect it will be a challenge for all but the shortest linesets.

  12. #38
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,384
    how do these units run craig? what is the common metering device? do the evap coils still get as cold? how about condensers? whats the temp?

  13. #39
    Join Date
    Jul 2007
    Location
    Tulsa, OK
    Posts
    943
    Quote Originally Posted by garyed View Post
    I've replaced between 25 to 30 leaking all aluminum microchannel outdoor coils under warranty this summer. Its left bad taste in my mouth for microchannel coils. The only reason for using them is to get the same heat transfer with less materials & less freon so its basically cheaper to make the units. I'll stick with the old stuff as long as I can.
    Add the fact that Carrier plasters about ten stickers warning to use "Only Water" to clean the cond coil. Guess any Chemicals will murder the coil.

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