20 amp. circuit breaker trips on interriment basis


  #1  
Old 11-15-10, 09:19 AM
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20 amp. circuit breaker trips on interriment basis

have trane equipment.

have dual zone hvac complicated because it only does it sometimes.

unit, upstairs and down. approx. 3000 sq. feet.


we are having a problem with 20 amp breaker blowing on a intermittent basis, it happens both in the heat and cool operational modes.

we have replaced the breaker at the box twice.


we are located near annapolis. md

thanks

i guess the fix will b
 
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Old 11-15-10, 11:42 AM
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What are the loads connected to the circuit?
 
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Old 11-15-10, 12:26 PM
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hi mike, don't understand the question?

i know the problem is the outside unit not the unit mounted in the attic. the fan operates just fine.

there is also an on/off breaker mounted on the outside next to the unit, it has a fuse inside the box..
 
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Old 11-15-10, 01:45 PM
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Go to the outdoor equipment supplied by the 20-A ckt breaker. Post a legible photo of the nameplate here - or write down what it says, and transcribe it here.

Is the breaker a single-pole (120-V) or a double-pole (240-V)?

http://forum.doityourself.com/electr...your-post.html
 
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Old 11-16-10, 05:10 AM
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mike i could not take a pic, because my camera was left on the boat.

however, the data plate says min. fuse is 20 amp. and max fuse is 20 also.

ii does have the box mounted on the side of the house with the on/off lever with a fuse inside, it has never blown.

i have a double pole 240 in the breaker box in the house. that is the one that blows from time to time, during cooling and heating.

the other larger downstairs unit with a 30 amp circuit has nev er blown and they were wired by the same company.
 
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Old 11-19-10, 12:10 PM
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The unit is drawing excess amps - hard to say why. Maybe the motor capacitor is weak? Low voltage at the motor terminals will cause an induction motor to draw more amps?
 
 

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