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  1. #1
    Join Date
    Nov 2011
    Location
    New Hampshire
    Posts
    14

    Confused Hill Rack problem

    I had a service call today on a hill rack down. Arrived on site and found the control bkr tripped. I reset bkr and rack kicked back on kept an eye on it for about an hour and a half. While running I check all controls wiring I ripped the whole thing apart and found no bad wires. I am think maybe the bkr is going bad the last time it happen was three weeks ago. Does anyone have any ideas?

  2. #2
    Join Date
    Mar 2008
    Location
    Banana Republic,Florida
    Posts
    400
    i have found the wires going to the 3 way valve or DDR valve with a short at the connector i have never had a bad control breaker your going to have to chase the common wire and see if you can find a nick or short
    Mastic its whats for dinner!

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,943
    Quote Originally Posted by gatorfan9606 View Post
    i have found the wires going to the 3 way valve or DDR valve with a short at the connector i have never had a bad control breaker your going to have to chase the common wire and see if you can find a nick or short


    Bad breakers are EXTREMELY rare.

  4. #4
    Join Date
    May 2003
    Location
    Utah
    Posts
    689
    Quote Originally Posted by Navy06 View Post
    I had a service call today on a hill rack down. Arrived on site and found the control bkr tripped. I reset bkr and rack kicked back on kept an eye on it for about an hour and a half. While running I check all controls wiring I ripped the whole thing apart and found no bad wires. I am think maybe the bkr is going bad the last time it happen was three weeks ago. Does anyone have any ideas?
    This would fall under the category of DON'T be a parts changer. It may take some time and effort, but find the cause.

  5. #5
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,057
    Cycle every control voltage load on/off.

    take a insulated screwdriver and bang on all flex conduit.

    Pull graphs an take note of when the cases started to run warm...this could/should point you into the direction of where to start looking.

    I had just the other day a circuit that towards the end of defrost would start to pull 45 amps and blow the main control fuse...it was a bugger to find. Was a shorted to ground termination circuit in case#3 of a 6 case line.

  6. #6
    Join Date
    Dec 2010
    Location
    new jersey
    Posts
    362
    I would also like to add, although you have checked the wiring, it may also be in the coils themselves...

    I like to force all comps. Split valves, sorits and well,anything that may be on the control circuit.

    I once found the lamp on the circuit rocker switch was the culprit...Good luck!

  7. #7
    Join Date
    Feb 2009
    Location
    Wisconsin
    Posts
    304
    Ive had a bunch of these on Hill racks. Most were traced to wires in flexible metal conduits. Those Carlyles vibrate enough to cause the insulation to wear thin on the wires. The control circuit usually isnt enough to blow a hole in the conduit but when a compressor feed wire wears through, they are easy to find. Just look for the hole melted and you have it. When I find them I replace the coduit with non metalic liquid tight making sure there is a ground wire of course.
    Never kick a lying dog.

  8. #8
    Join Date
    Dec 2010
    Location
    Central US
    Posts
    388
    Throw an amp probe on circuit and record then tighten all associated screw terminals and record, oh yea dont forget to check tightness of solenoid coils especially if their compound compressors. ditto on the aluminum flex lines.

  9. #9
    Join Date
    Sep 2011
    Location
    Plainfield IL
    Posts
    101
    yes I agree with thermofridge breaker probably just doing its job.

  10. #10
    Join Date
    Feb 2004
    Location
    Hampstead/NH
    Posts
    178
    Its not the breaker Dennis. Like the guys said, cycle every load off your relay boards, defrost solenoids, defrost contactors, split, reclaim etc. My cell over here is 508-889-3383 . Tim

  11. #11
    Breaker did it's job. Continue to try and find the short. Keep in mind, once a breaker trips it's experienced stress and could now be week. Some recommend to replace breakers after they trip.

  12. #12
    Join Date
    Apr 2011
    Location
    Northeast Illinois
    Posts
    83
    Quote Originally Posted by thermofridge View Post
    Ive had a bunch of these on Hill racks. Most were traced to wires in flexible metal conduits. Those Carlyles vibrate enough to cause the insulation to wear thin on the wires. The control circuit usually isnt enough to blow a hole in the conduit but when a compressor feed wire wears through, they are easy to find. Just look for the hole melted and you have it. When I find them I replace the coduit with non metalic liquid tight making sure there is a ground wire of course.
    I have seen this many times, it can drive you crazy until you learn what to look for. Sometimes there will be a small burn hole in the flex from the arcing. Ive seen them trip right away, or a year later.

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