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  1. #1
    Join Date
    Jun 2006
    Location
    Texas
    Posts
    497

    Microchannel coils

    We just installed a refrigeration condensing unit on a roof that has Microchannel condenser coil and these are some of problems I notices.
    The wind and rain goes through Microchannel coil easier than a fin coil. The wind keeps the fan blade turning all the time, this may cause early fan motor bearing failure. Also a hard rain can get in control box due to all the holes for mounting.
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  2. #2
    Time for some silver tape on the inside of that panel.

  3. #3
    Join Date
    Jun 2006
    Location
    Texas
    Posts
    497
    Quote Originally Posted by smilies View Post
    Time for some silver tape on the inside of that panel.
    You mean like this...
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  4. #4
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,137
    I didn't think they had a micro without a scroll in it..

    I like the micro's so far they should be really easy to clean. And have only had one leaker out of about 12... Time will tell though.

  5. #5
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,266
    Heatcraft's Hypercore microchannel condensers have been standard on all their units through 6 HP since the beginning of 2009.

    I've sold several of them for beachfront jobs and after a year in the salt air they still look like new.

  6. #6
    Join Date
    Jul 2009
    Location
    Connectitaxed
    Posts
    2,644
    Quote Originally Posted by sammyray View Post
    We just installed a refrigeration condensing unit on a roof that has Microchannel condenser coil and these are some of problems I notices.
    The wind and rain goes through Microchannel coil easier than a fin coil. The wind keeps the fan blade turning all the time, this may cause early fan motor bearing failure. Also a hard rain can get in control box due to all the holes for mounting.
    Haven't had to deal with microchannel just yet.....but I have to ask, what is with all the mounting holes?!?

  7. #7
    Join Date
    Nov 2008
    Location
    Altamont, IL
    Posts
    371

    Where's The SCROLL

    I'm with DCHAPPA. Scroll is th way to go.
    In GOD We Trust

  8. #8
    Join Date
    Jun 2006
    Location
    Texas
    Posts
    497
    Quote Originally Posted by icemeister View Post
    Heatcraft's Hypercore microchannel condensers have been standard on all their units through 6 HP since the beginning of 2009.

    I've sold several of them for beachfront jobs and after a year in the salt air they still look like new.
    We are about 45 miles away from the breach. I don't think salt air will be a problem.
    I just don't like the fan turning in wind less than 5 miles an hour.
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  9. #9
    Join Date
    Apr 2007
    Location
    Philadelphia
    Posts
    2,192
    I found you cannot pump these units down also. And it seems common to me that fans move with slight wind. Maybe it is just windy in my area all the time??

  10. #10
    Join Date
    Jun 2006
    Location
    Texas
    Posts
    497
    Quote Originally Posted by d_griff View Post
    I found you cannot pump these units down also. And it seems common to me that fans move with slight wind. Maybe it is just windy in my area all the time??
    You can pump it down with service valves, but you have leave your hoses on.
    I don't know why they turn service valves backwards on these units.
    Being close to coast its windy most of the time.

  11. #11
    Join Date
    Apr 2007
    Location
    Philadelphia
    Posts
    2,192
    Quote Originally Posted by sammyray View Post
    You can pump it down with service valves, but you have leave your hoses on.
    I don't know why they turn service valves backwards on these units.
    Being close to coast its windy most of the time.
    I've found the coil can not hold the volume of the refrigerant. they are too small.

  12. #12
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,266
    Quote Originally Posted by d_griff View Post
    I've found the coil can not hold the volume of the refrigerant. they are too small.
    If you have a residential A/C unit with a microchannel condenser yes that is true, but this thread is talking about commercial refrigeration condensing units which have receivers for pumpdown.

  13. #13
    Join Date
    Apr 2007
    Location
    Philadelphia
    Posts
    2,192
    Quote Originally Posted by icemeister View Post
    If you have a residential A/C unit with a microchannel condenser yes that is true, but this thread is talking about commercial refrigeration condensing units which have receivers for pumpdown.
    Do they make micro channel units for residential?
    I am also talking about commercial refrigeration products, Though if it has a receiver then my point is pointless.

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