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  1. #14
    Join Date
    Oct 2003
    Location
    Valdosta Ga
    Posts
    847
    One of the first jobs I did on a install with Carrier contractor was a tripping cb in heat mode turned out to be a fan relay wired wrong from the factory

  2. #15
    Join Date
    Jan 2012
    Location
    Toronto
    Posts
    5
    Usually motors draw more current upon start up. The induced emf (Electro Magnetic Field) in the motor's shaft depends on the rotation speed of the motor (at startup roter is at rest) so therefore the starting current (called inrush current) will be up to 10 times higher than the motor's rated current.

    I suggest turning the units on one at a time.

  3. #16
    Join Date
    Jan 2012
    Location
    indy
    Posts
    471
    Quote Originally Posted by Tech it out View Post
    Actually had an electrician (experienced with own biz) tell me there was no such thing as a weak breaker!
    anything is possible

  4. #17
    Join Date
    Mar 2012
    Location
    My house is in Texas..
    Posts
    141
    Dumb idea .... But check lug connection on all electrical fittings going to main ...

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

  5. #18
    Join Date
    Mar 2012
    Location
    My house is in Texas..
    Posts
    141
    Ps..
    Did it trip when you tested it? What was volts?

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

  6. #19
    Join Date
    Feb 2012
    Location
    Alabama
    Posts
    378
    Quote Originally Posted by hvacmike85 View Post
    anything is possible
    Ive changed many over the years that had no where near the rated amps. Maybe we should start calling it "strength challenged" instead of weak!
    II Chronicles 7:14 Galatians 2:20 Ephesians 2:8-9

  7. #20
    Join Date
    Nov 2011
    Location
    Charleston, Wv.
    Posts
    1,488
    yeah, what's the LRA ratings on those units?? if they both started at the same time....or if the building amp draw was already high, and one kicked on,that might do it.

    just looked at a 3ton residential rheem yesterday, it's comp. LRA was 112a.

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