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  1. #1

    Trasformer tripping the secondary control voltage

    Hello, any body that can send me in the rigth direction, I have a heatpump ICP PFH060H000A that is making the secondary control voltage to trip(transformer is multi-voltage 120/208/230/40Va) when is in heat mode. I have check the defrost card and the sensor to ground looking for any cain of short with out success. Any help will be highly appreciated.

  2. #2
    Join Date
    Aug 2008
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    Eagle (Boise), Idaho
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    385
    What about cooling mode or emergency heat?
    If not in emergency heat, check ohms @ contractors, should be somewhere around 8 ohms
    Tell Obama he can keep the change

  3. #3
    Join Date
    Jun 2010
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    167
    Since this is posted in tech to tech and not in aop and I need to get my post count up, here you go. Check for a short going from your frost control board to your reversing valve. If you only have low voltage issues in heat try removing the wires from your reversing valve and securing them where they will not short and see if it blows. If it doesn't, it could be the reversing valves solenoid. Try taking a piece of plastic flexible conduit and putting it on your reversing valve wires. If its only tripping on heat, its localized to your O terminal. Some shorts on reversing valve wires can be really small.

  4. #4
    Join Date
    Nov 2005
    Location
    Charlotte, N.C.
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    964
    Quote Originally Posted by Baycienda View Post
    Since this is posted in tech to tech and not in aop and I need to get my post count up, here you go. Check for a short going from your frost control board to your reversing valve. If you only have low voltage issues in heat try removing the wires from your reversing valve and securing them where they will not short and see if it blows. If it doesn't, it could be the reversing valves solenoid. Try taking a piece of plastic flexible conduit and putting it on your reversing valve wires. If its only tripping on heat, its localized to your O terminal. Some shorts on reversing valve wires can be really small.
    ICP doesn't energize the reversing valve in heat execpt during defrost.
    Those who restrain desire do so because theirs is weak enough to be restrained. (William Blake)

  5. #5
    Join Date
    Nov 2005
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    Charlotte, N.C.
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    964
    Quote Originally Posted by valdezjc View Post
    Hello, any body that can send me in the rigth direction, I have a heatpump ICP PFH060H000A that is making the secondary control voltage to trip(transformer is multi-voltage 120/208/230/40Va) when is in heat mode. I have check the defrost card and the sensor to ground looking for any cain of short with out success. Any help will be highly appreciated.

    Is this short immediate or intermittent?
    Those who restrain desire do so because theirs is weak enough to be restrained. (William Blake)

  6. #6
    Join Date
    Oct 2011
    Location
    Arkansas
    Posts
    835
    I'd be breaking out the ohm meter. Check resistance of all the energized loads in the heating mode, and inspect the control wiring.

    Having a little problem with the OP's comment on the multitap primary Xformer. As long as it's wired for the correct line voltage, it shouldn't be a problem.
    Don't think that would figure into the equation.

    Correct me if I'm wrong. A RV that energizes in the heat mode is connected to the B terminal.

  7. #7
    Join Date
    Mar 2008
    Location
    NC
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    1,461
    I had a Carrier heat pump about a year ago that would trip the lv ckt brkr, but only when coming out of heat. Isolated everything....everything ohm'd good..
    Finally found that when the heat cycle ended it tripped because the secondary was grounded.

  8. #8
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    Aug 2008
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    Eagle (Boise), Idaho
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    385
    If the reversing valve t state wire is blue then the valve is energized in heating, orange is for cooling.
    Tell Obama he can keep the change

  9. #9
    Join Date
    Mar 2008
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    Baltimore MD and Ridgebury PA
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    Quote Originally Posted by Mille Racer 69 View Post
    If the reversing valve t state wire is blue then the valve is energized in heating, orange is for cooling.
    If you are referring to the wires from the stat to the outdoor unit, the wire can be any color. Depending on the installer and the number and color of the conductors in the wire they ran they could have used blue for common instead... or anything else they wanted to do.

  10. #10
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    Oct 2011
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    Indianapolis IN
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    404
    Quote Originally Posted by trey r View Post
    ICP doesn't energize the reversing valve in heat execpt during defrost.
    The question in your next post is a great one. On reading the op, I was immediately wondering if this 'short' is happening when the unit goes into defrost.

    To the OP, is this shorting out as soon as there is a call for heat, or is the short occurring at some point during the heating cycle? Like, say, when the unit goes to defrost?

  11. #11
    Join Date
    Jun 2010
    Posts
    167
    AC5096 You are right, I apologize. O is used for Ruud, Rheem, and Weather King. ICP products (Heil, Tempstar) are ran off of B. But I do believe that if you break the connection that holds the problem you will find it a lot quicker.

  12. #12
    Join Date
    Sep 2011
    Location
    Vancouver, WA
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    261
    Quote Originally Posted by Baycienda View Post
    AC5096 You are right, I apologize. O is used for Ruud, Rheem, and Weather King. ICP products (Heil, Tempstar) are ran off of B. But I do believe that if you break the connection that holds the problem you will find it a lot quicker.
    Ruud/Rheem energizes the rv in heat which is a B terminal, most everbody else energizes the rv in cool which is an O terminal, and trane uses a B terminal for common.

  13. #13
    Quote Originally Posted by ncboston View Post
    I had a Carrier heat pump about a year ago that would trip the lv ckt brkr, but only when coming out of heat. Isolated everything....everything ohm'd good..
    Finally found that when the heat cycle ended it tripped because the secondary was grounded.

    thank you guys for all the inputs, This unit runs good in heat all the way until set point is satisface, then it will tripp the secondary voltage. I did remember seen one of the leads of the secondary grounded to the chassys of the unit.
    Would this be the problem.....?
    This morning I when back to this unit and remove the thermostat from the base and check the jumper settings, they were all OK, and when I put the thermostat back the system come back ON and star the heating cycle like nothing happen. I be going back tomorrow and remove the ground wire to the secondary.
    Thanks for all the inputs

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