Page 1 of 2 12 LastLast
Results 1 to 13 of 14

Thread: breaker trip

  1. #1
    Join Date
    Nov 2003
    Posts
    20
    Ok this is my first install. Trane condenser 2.5 ton,18TD
    10SH carrir chart said 8SH (85OSA/62WB)Gages read 215H/78L
    Liquid line near evap coil very warm 60SA/78RA. Brand new 30 amp breaker. Compressor 13.6amps (label reads 13.2 FLA) check capacitor and meg ohm compressor both show no weakness. Breaker trips once a week.

    My quetions is would the wrong piston size in the metering devise cause to much restriction, cause high amps, and the liquid line being very warm at evap.

    When I installed the system i used the orfice that came with the coil NO.67, instead of the the orfice that came with the condensor NO.65.

    Other than that i have no idea what could be the problem.
    Any feed back would be great.

    [Edited by kctech on 06-13-2005 at 08:13 AM]

  2. #2
    Join Date
    May 2005
    Posts
    428
    I dought it very much. did you check all your electrical connections to see if there all tight ?

  3. #3
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,741
    noo way it would cause a 2 1/2 ton unit to trip a 60 amp breaker. something very bad happening there.

  4. #4
    Join Date
    Mar 2002
    Location
    Richmond, Virginia
    Posts
    4,264
    Could be a defective breaker if all the electrical connections are tight. If you have an infrared thermometer, check the temperature of the breaker and lugs after the system has been running for a while. BUT, only do this if you are a technician. If a homeowner disregard what I said. Couldn't tell by your profile.

    [Edited by HVAC Pro on 06-12-2005 at 09:03 PM]
    There is nothing more frightful than ignorance in action....Mark Twain

  5. #5
    Join Date
    Jun 2003
    Location
    GA
    Posts
    395

    Talking

    Originally posted by hvacguy1075
    I dought it very much. did you check all your electrical connections to see if there all tight ?
    Tightly connected to ground maybe. LOL

    Sorry, cheep shot.

  6. #6
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    What kind of tstat on the unit? If it is a manual tstat and someone turns it off and then back on without waiting for the pressure to equalize in the system there is a good chance the breaker could trip. I would think with a 60 amp breaker it might not trip, seems awful big breaker for 2.5 tons, would think that a 30 amp would be the better choice. Would have to check on the unit specs and see breaker size. If it is an electronic thermostat make sure it has a 5 minute delay on it. This will avoid a situation like nuisance breaker tripping. My wife used to play with the tstat like that, I would come home from work and the house would be hot, she would say "but the unit has been running all day" Furnace fan running but breaker to A/C tripped. I put in a delay relay and problem solved.
    "Go big or Go Home"

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,928


    Over charged.

    Pump it down, put the right piston in, and adjust charge.

    Also check the max amp circuit rating, 60 amp for 2.5 ton, just doesn't sound right.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  8. #8
    Gages read 215H/78L from the that reading. It has to be electrical problem..

    How can you know the unit is over charged when you dont know what the outside and inside temp is.. Temp and preasure directly relate..

    You have a hot wire touching some where it may be pinched from the nail staples.

    Impossible for a 2.5 unit to knock out a 60amp breaker.

    Try running new wire... You are not over charged, and just because the liquid line is warm to touch. Thats the way it should be when it hot outside..

    regards,
    Kelvin

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,928
    Your right, the hot wire touching some where could be causing the compressor to draw more then RLA.

    Slightly oversized piston will keep the head pressure down, even when over charged.

    To get the superheat he had to add more gas with that piston.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  10. #10
    Join Date
    Jan 2003
    Location
    Ludington Michigan
    Posts
    122
    I have never seen a 2.5 ton on anything more then a 30 amp, 10 gage wire, A 60 amp would require 6 gage wire. Is there 6 gage wire running to the unit.I have installed time delays on units before to allow the compressor to equalize before comming back on,but I really find it hard to beleive anything but a short to ground or a bad breaker is the cause. What does the name plate say the rated amps are?

  11. #11

    time delay fuses

    kctech

    Check the max rating for unit and put a breaker in line for that rating. It should be around 25 amp. To have 60amp in line will let you unit burn up in case of a fault. You might have a 60 amp disconect but put 25 amp fuses in.. time delay of couse

    regards,
    kevin

  12. #12
    Join Date
    Sep 2004
    Posts
    3,157
    Brand new 30 amp breaker

    am I not seeing something here? where has everyone come up with a 60 amp breaker

  13. #13
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    CT2 original post was edited used to say 60 amp breaker, now that it says 30 amp makes a lot more sense. I still say make sure the unit is not being turned off and then on right away. Put some kind of delay in there and see if the nuisance tripping stops. Used to see it all the time when we were using manual tstats instead of electronic.
    "Go big or Go Home"

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event