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  1. #40
    Join Date
    Dec 2011
    Posts
    107
    say it not so!

  2. #41
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,434
    Quote Originally Posted by JBM1000 View Post
    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.
    THX for posting this! Will make a mental note to be careful using 'Nu-
    Brite' on those condensers.

    I hope we are not heading towards a C-F with this new technology. The old aluminum indoor coils GE And Trane made were good coils... I guess they were too good for the bean counters.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  3. #42
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,498
    Quote Originally Posted by gravity View Post
    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?
    They work just as good as condensers with copper coils. Nordyne's copper indoor coils use txvs which I really like. I hear the new evaps will use pistons but txv will be optional.

    The one thing you have to be careful of with the microchannel condensers is they are REALLY easy to overcharge.

  4. #43
    Join Date
    Mar 2011
    Location
    Galveston Texas
    Posts
    530
    we sold a few of the condensers when thy came out. With our corrosive atmosphere they last about 2 yrs before leaks start showing up. Once we started having a run of these leaks we quit selling them. Every once in awhile we'll get a new customer who has one and the first place we go is to pull the leak detector out. If it's in warranty we'll replace the coil and be done with it, until it's out of warranty then we change the condenser.

    Charging is critical. Do it by weight. They give the chart for lineset length/size/rise and how much extra you should add.

  5. #44
    Join Date
    Apr 2007
    Location
    Saint Augustine, Florida, United States
    Posts
    1,156
    why would they be easy to overcharge? also, we can't clean with foaming coal cleaner, but is that because it breaks down the aluminum too quickly?

  6. #45
    Join Date
    Mar 2011
    Location
    Galveston Texas
    Posts
    530
    they are easy to over charge because they don't require near the same amount of refrigerant as a standard unit does. I've seen them listed as needing as little as 4 lbs for the particular lineset it was on (don't remember the length). Now you simply add 1 lbs of gas and suddenly your over charged by a full 25%.

  7. #46
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,342
    I see Dave is joining Carrier, Rheem & McQuay with MC in light commercial.

    http://www.lennoxcommercial.com/landing/environ.asp

  8. #47
    Join Date
    Oct 2010
    Location
    Hanover, PA
    Posts
    6
    Quote Originally Posted by JWB View Post
    why would they be easy to overcharge? also, we can't clean with foaming coal cleaner, but is that because it breaks down the aluminum too quickly?
    A trane rep told all of our guys that chemical cleaners of any kind were not to be used on multi-channel coils. Water is sufficient and should be the only means of cleaning these coils to preserve coil life. Not sure how well this will work on some of the extreme cases but time will tell.

    Let me know if anyone knows of a cleaner that is safe for this type coil.

  9. #48
    Join Date
    Mar 2012
    Location
    West Chester, PA
    Posts
    511
    Just as stated above, the main problem with these types of coils is over charging. They are very charge critical and can be very unforgiving with high pressure faults. Technicians must wait the required 15 minutes inbetween adjustments or they will overcharge these systems all day long.

  10. #49
    Join Date
    Sep 2007
    Location
    South Dakota
    Posts
    165
    Quote Originally Posted by BaldLoonie View Post
    The XB300's coil is Chinese. Wonder if York & Nordyne make their own?
    Was just at the nordyne factory about a month ago. They do not make their own microchannel coils. They come from china.

    Said they would possibly start making their own as more of their product line gets switched to microchannel coils, but as of now they do not.

  11. #50
    Join Date
    Dec 2003
    Posts
    263
    I just checked out the microchannel coils for Nordyne. What a nightmare. Im doing a new construction job right now and am planning on installing a nordyne system. Looking at they're "quick data reference sheet" (match AH to OD unit) I have to add an additional 29 oz right off the bat. Then add for the additional lineset.

    Now if Im installing a a 3.5 ton 14seer hp with the new c7 MC coil, I have to change the orfice to an field supplied txv and add 29oz. But heres the kicker, you have to change the outdoor units orfice from .55 to a .57... How stupid is that

    Might have to reconsider using nordyne equipment on future jobs.

    MH

  12. #51
    Join Date
    Feb 2010
    Location
    Ohio
    Posts
    562
    Quote Originally Posted by mh heating View Post
    ...I have to change the orfice to an field supplied txv...
    External on internally equalized TXV? If external, is it mechanically installed or sweat?

  13. #52
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,279
    Microchannel is just another way to make the system cheaper & still get the SEER. The bottom line is it all comes down to profit. The only slight advantage for our side is they can cut the size of the equipment down a little for some of those tight spaces. Other than that the disadvantages so far have far outweighed any advantage for us.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

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