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  1. #14
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,659
    First off, I'm going to say too much defrost.

    A case like that will do fine with 4 a day, although you might need to stretch them out to 35 minutes or so.


    Those can be a royal pain to get to hold temp.

    You MUST cover all of the bases. Get your superheat down, your suction pressure is a bit high for a case like that. I'd like to see an evap down closer to 15-18 rather than 21.

  2. #15
    Join Date
    May 2011
    Location
    CA
    Posts
    123
    Did you check the honeycombs themselves? They can get a nice blanket of crap on top of them that will impede airflow quite a bit. I'd think the week holes in the back of the case may be able to keep the lower shelves at temp? Maybe?

  3. #16
    Join Date
    Sep 2006
    Posts
    154
    Call hussmann and get case specs

  4. #17
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,351
    Here's the case specs for the RIN3:


    If the case in question is a different model, go to their search page here and enter the case model you have.

    The RIN3 calls for a 20F evap temp and 27F discharge air with 4 defrosts/day, time terminated at 20 minutes.

    Verify your store conditions are at or below 75Fdb/55%RH.

    Also, the shelf sizing and load limits are critical on these cases.

  5. #18
    Join Date
    Oct 2009
    Location
    WI
    Posts
    114
    We recently removed one of these cases because it would not hold temp on the ends.

    I agree with jp. Reduce the defrosts to 4x a day. 30min duration is plenty.

    As icemeister indicated, shelf sizing/placement and load limits are very critical in these island cases.

  6. #19
    Join Date
    Nov 2009
    Posts
    385
    If you believe this case to be a Hussmann "RI" island case, the supply air spec is 26 - 27. In addition, there are several supply air metering plates inside the case that get plugged solid and need cleaned.
    Also, the defrost spec is 6 times (every 4 hours) / day for 20 minutes. I set the duration for 25 minutes given the region I am in. It is not "too much" defrost if the case is set down to the proper supply air temp and it builds the expected frost load on the coils.
    Last edited by thefreezerguy; 01-31-2012 at 01:55 AM.
    "Don't wish it were easier, wish you were better"

  7. #20
    Join Date
    Mar 2003
    Location
    Cochrane, AB
    Posts
    604
    Quote Originally Posted by thefreezerguy View Post
    If you believe this case to be a Hussmann "RI" island case, the supply air spec is 26 - 27. In addition, there are several supply air metering plates inside the case that get plugged solid and need cleaned.
    Also, the defrost spec is 6 times (every 4 hours) / day for 20 minutes. I set the duration for 25 minutes given the region I am in. It is not "too much" defrost if the case is set down to the proper supply air temp and it builds the expected frost load on the coils.
    x2. These cases plug up with dirt faster than any other case in a supermarket. There is a horizontal baffle mounted in the 'tower' the same height as the pans and I would bet money it's plugged solid. You will need to remove all the bottom product and wash it out with a hose. A velometer is a must-have tool for working on cases.

  8. #21
    Join Date
    Aug 2004
    Location
    Kansas
    Posts
    133
    There's not a grocer born that doesn't overload a produce case!!!!
    You can't stop them and health (temperature) inspectors know that
    They stack it up for impulse buying almost 2 feet out of the air flow
    then all the cold air falls on the floor and none makes it to the top shelf
    My IR thermo shows 59 to 60 at times on produce
    Give them a picture of max load lines and they smile at you and then
    as soon as you leave they overload the case so they won't get fired
    Some would rather stock a non refrig product on the top shelf so they
    can continue overloading the lower shelves and dump horsepower on the
    floor but it makes a good cold display for beer on sale on the floor LOL

    If one fan motor has failed they all have to be replaced as they have
    the same hours history on the bearings and you can't see lowered rpms
    and don't allow any bent blades which do cause lower rpms = lower cfms

    If you unloaded and power washed all possible air flow restriction areas
    replace all fan motors, check for correct blades and balance the blades
    If the motors are replaced I increase wattage size to at least 9w if smaller
    than (4 or 6watt) that, check superheat and coil temp defrost clock and
    mfg settings, check the R-22 compressor for blow by caused by case
    overloading for 5 years then remark case load limit lines and call it a day

  9. #22
    Join Date
    Apr 2001
    Location
    MINN
    Posts
    938
    Quote Originally Posted by jpsmith1cm View Post
    Your case is too friggen warm


    Set it down to 32 supply air or so.


    While you're at it, make CERTAIN that the product stocked is cold enough (below 35F)

    If it isn't you're BOTH wasting your time.
    X2 Ive run into this often at same store after health dept visit.

  10. #23
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,659
    Quote Originally Posted by therock View Post
    If the motors are replaced I increase wattage size to at least 9w if smaller
    than (4 or 6watt) that,
    This is almost NEVER a good idea.

    There is a proper position for a fan blade within the plenum, and installing a larger (or smaller) sized motor can and WILL change that postition, altering airflow for the worst!

    Replace the motor with the proper sized one.

  11. #24
    Join Date
    Apr 2003
    Location
    New York
    Posts
    700

    Talking

    Quote Originally Posted by icemeister View Post
    Here's the case specs for the RIN3:


    If the case in question is a different model, go to their search page here and enter the case model you have.

    The RIN3 calls for a 20F evap temp and 27F discharge air with 4 defrosts/day, time terminated at 20 minutes.

    Verify your store conditions are at or below 75Fdb/55%RH.

    Also, the shelf sizing and load limits are critical on these cases.
    THANKS

  12. #25
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,512
    Quote Originally Posted by therock View Post
    There's not a grocer born that doesn't overload a produce case!!!!
    You can't stop them and health (temperature) inspectors know that
    They stack it up for impulse buying almost 2 feet out of the air flow
    then all the cold air falls on the floor and none makes it to the top shelf
    My IR thermo shows 59 to 60 at times on produce
    Give them a picture of max load lines and they smile at you and then
    as soon as you leave they overload the case so they won't get fired
    Some would rather stock a non refrig product on the top shelf so they
    can continue overloading the lower shelves and dump horsepower on the
    floor but it makes a good cold display for beer on sale on the floor LOL

    If one fan motor has failed they all have to be replaced as they have
    the same hours history on the bearings and you can't see lowered rpms
    and don't allow any bent blades which do cause lower rpms = lower cfms

    If you unloaded and power washed all possible air flow restriction areas
    replace all fan motors, check for correct blades and balance the blades
    If the motors are replaced I increase wattage size to at least 9w if smaller
    than (4 or 6watt) that, check superheat and coil temp defrost clock and
    mfg settings, check the R-22 compressor for blow by caused by case
    overloading for 5 years then remark case load limit lines and call it a day

    Really!!! I guess you don't work on a contract Market.
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

  13. #26
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,512
    Quote Originally Posted by jpsmith1cm View Post
    This is almost NEVER a good idea.

    There is a proper position for a fan blade within the plenum, and installing a larger (or smaller) sized motor can and WILL change that postition, altering airflow for the worst!

    Replace the motor with the proper sized one.

    X2
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

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