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  1. #1
    Join Date
    May 2011
    Location
    south florida
    Posts
    184

    change condenser air flow direction?

    i am a service technician and applied for professional membership a while ago. i guess you only induct new ones once a year or something. so thats why this isnt in the pro forum.


    i have a Bard package unit that sits 4 inches away from my dryer outlet. this particular design unit draw condenser air in from the side and pushes it through the coil. needless to say, its now plugged with lint, and running 400+ head pressure.

    the coil is deteriorating, just a little bit, from previous cleaners, but im going to have to clean it again. this time though, id like to change the fan blade and make it pull air through the coil, for several reasons.

    1 this should reduce/prevent further lint ingestion
    2 make future cleaning easier
    3 hopefully operate better with a clean breathing coil.

    i imagine the air pulls through the coil better then it pushes. i gather equipment manufacturers learned that one the hard way since most older units i remove push air through the evaporator and none of the new ones ive worked on do it that way anymore.

    so, am i looking at any unforeseen problems before i buy some coil cleaner and a fan blade, and move air the opposite direction of the manufacturers intentions? im not worried about a SMALL drop in performance if there is one. the system cant meet demand as it is now. its not an old unit ether. its just a crap setup. right next to the dryer vent and getting south west sun shine all through the hottest parts of the day maybe ill take some picture of this winning setup and share them later on.

  2. #2
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    awhile???????????????

    it does take time for the membership committee to go thru them


    seeing you joined in may?????



    why not move the freekin' dryer vent?
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  3. #3
    Join Date
    Mar 2011
    Location
    Texas
    Posts
    27
    I have seen it done but it would be better to move the vent if u can.

  4. #4
    Join Date
    May 2010
    Location
    Oxford, UK
    Posts
    338
    Lots of coils run the air across the outside in the opposite direction to the way the refrigerant runs through the inside, might mess up the subcooling.

    Move the vent, pipe it down the wall a bit if thats allowed, or wire in a relay to shut off the condenser when the driers running.

  5. #5
    Join Date
    Apr 2007
    Location
    Kaufman county, Texas
    Posts
    10,251
    I agree with others, move the dryer vent.

    I would even opt to move the condensing unit before I would attempt to re engineer it's design.
    "You boys are really making this thing harder than it has to be". Me

    "Who ARE you people? And WHAT are you doing in my SWAMP!?" Shrek

    Service calls submitted after 3PM will be posted the next business day.

    I give free estimates [Wild Ass Guesses] over the phone.

    "I am sorry for interrupting, please continue with your quarreling" Some chick on TV

  6. #6
    Join Date
    May 2011
    Location
    south florida
    Posts
    184
    moving the dryer vent isnt an option. it comes out through the wall right between the unit and laundry room door. its also a flat roof over top of it, so no attic space to run it.

    this unit is only about 6 years old and its now summer time so im not going to be changing the unit yet. if i did, it would be to a split system and require much more work. for now im just looking to reverse air flow trough the condenser coil so its no longer sucking the lint in. reversing air flow would actually dispel air out the side and push lint away from the unit.

    later on down the road, id like to replace it with a more efficient split system, and move the condenser to the east side of the house, away from the dryer vent and in the shade most of the day.

    so my question. does anyone see any serious problems with just changing the air flow direction? this is the simplest solution to get my unit cooling acceptably until i can do something more permanent.

  7. #7
    Join Date
    Feb 2009
    Location
    New Orleans
    Posts
    40
    What is the model and serial number of the unit?

    I've done this a few times on some Bard units to solve various issues. The reason (as far as I can tell) that they design it the way they do is sometimes there are multiple units placed side-by-side and you wouldn't want them to blow hot air at each other.

    But...

    In cases where you only have one unit you can get much better performance by reversing the airflow. As a matter of fact, that's one of the reasons I do it. I have many old units with moderately corroded coils running ~350psi on hot days and the same unit will typically drop to ~250-280psi by simply reversing the flow.

  8. #8
    Join Date
    Jun 2011
    Location
    sunnny south west florida
    Posts
    34
    grab your gauges and pipe clamp and see what happens in the heat of the day, let it run and watch it, you would think as long as your matching the cfm across the coil direction shouldn't matter. but...wont the dryer lint still get in it. that stuff is fine and if the units the only thing moving air out there its still going to grab some wont it. ive seen a guy use snap lock on the out side of his home to move the vent 6 feet away or so. it looks horrible but its better then it was.

  9. #9
    Join Date
    Mar 2006
    Location
    Denver/Boulder
    Posts
    2,392
    Quote Originally Posted by eric1589 View Post
    i am a service technician and applied for professional membership a while ago. i guess you only induct new ones once a year or something. so thats why this isnt in the pro forum.


    i have a Bard package unit that sits 4 inches away from my dryer outlet. this particular design unit draw condenser air in from the side and pushes it through the coil. needless to say, its now plugged with lint, and running 400+ head pressure.

    the coil is deteriorating, just a little bit, from previous cleaners, but im going to have to clean it again. this time though, id like to change the fan blade and make it pull air through the coil, for several reasons.

    1 this should reduce/prevent further lint ingestion
    2 make future cleaning easier
    3 hopefully operate better with a clean breathing coil.

    i imagine the air pulls through the coil better then it pushes. i gather equipment manufacturers learned that one the hard way since most older units i remove push air through the evaporator and none of the new ones ive worked on do it that way anymore.

    so, am i looking at any unforeseen problems before i buy some coil cleaner and a fan blade, and move air the opposite direction of the manufacturers intentions? im not worried about a SMALL drop in performance if there is one. the system cant meet demand as it is now. its not an old unit ether. its just a crap setup. right next to the dryer vent and getting south west sun shine all through the hottest parts of the day maybe ill take some picture of this winning setup and share them later on.
    As to membership... it takes what it takes. I had to wait awhile myself.

    You need a MINIMUM of 15 relevant posts to the trade (non DIY assistance) to help them decide. I believe Roboteq specifically forbade beer pong posting, FYI. I can tell you He is fond of sandwiches with liverwurst, if you get desperate.

    Reversing condenser fan motor: That's just crazy enough that I might want to try it, but I would monitor the system carefully. Sorry, can't say how, but you might know already. remember, no DIY posts

    Another option would be just hosing the condenser down once a week. No chemicals, other than H2O.
    What lies behind us and what lies before us are small matters compared to what lies within us.


    Two pressures, four temperatures = SUCCESS!


    Boulder Heating Contractor


    For Consumers:

    For HVACR Professionals:


  10. #10
    Join Date
    Mar 2006
    Location
    Denver/Boulder
    Posts
    2,392
    400 PSI?

    what's in that thing? green or pink?

    either way that's bonkers.
    What lies behind us and what lies before us are small matters compared to what lies within us.


    Two pressures, four temperatures = SUCCESS!


    Boulder Heating Contractor


    For Consumers:

    For HVACR Professionals:


  11. #11
    Join Date
    Apr 2007
    Location
    Kaufman county, Texas
    Posts
    10,251
    Quote Originally Posted by darctangent View Post
    400 PSI?

    what's in that thing? green or pink?

    either way that's bonkers.
    One other option might be a lint-master-4000. I actually have one, but it is a rare item so I would have to have a lot of compensation to part with it. Mine is green, 14-16 inch fin spacing. I am not really looking to sell it, but I am open to hear offers.
    "You boys are really making this thing harder than it has to be". Me

    "Who ARE you people? And WHAT are you doing in my SWAMP!?" Shrek

    Service calls submitted after 3PM will be posted the next business day.

    I give free estimates [Wild Ass Guesses] over the phone.

    "I am sorry for interrupting, please continue with your quarreling" Some chick on TV

  12. #12
    Join Date
    Sep 2007
    Posts
    176
    what happened to this idea?
    "or wire in a relay to shut off the condenser when the driers running. "

  13. #13
    Join Date
    Mar 2006
    Location
    Denver/Boulder
    Posts
    2,392
    Quote Originally Posted by tbirdtbird View Post
    what happened to this idea?
    "or wire in a relay to shut off the condenser when the driers running. "
    Mediocre at best. It will still plug up.
    What lies behind us and what lies before us are small matters compared to what lies within us.


    Two pressures, four temperatures = SUCCESS!


    Boulder Heating Contractor


    For Consumers:

    For HVACR Professionals:


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