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Old 10-01-2012, 12:31 AM   #1
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Trane XL90 transformers


This unit has blown two transformers in the last month. Our hvac man just replaces them. There has to be another problem blowing these units. I don't know enough about this particular gas heater, and I don't feel the hvac guy is troubleshooting the unit further. Any suggestions to what is poping these transformers?

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Old 10-01-2012, 05:53 AM   #2
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Trane XL90 transformers


Low voltage short.This time of year I'd look for mouse chewed wires in or around the AC.

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Old 10-01-2012, 06:20 AM   #3
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Trane XL90 transformers


you can install an inline 3A fuse on the low voltage side to protect the transformer. Fuses are much cheaper than transformers! But yes there is a short somewhere that is the underlying cause.
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Last edited by hvactech126; 10-01-2012 at 10:31 AM.
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Old 10-01-2012, 08:42 AM   #4
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Trane XL90 transformers


jWell the easiest solution is always best!! And a new digital thermostat couldn't hurt. Thank You!!
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Originally Posted by hvactech126 View Post
you can install an inline fuse on the low voltage side to protect the transformer. Fuses are much cheaper than transformers! But yes there is a short somewhere that is the underlying cause.
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Old 10-01-2012, 09:38 AM   #5
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Trane XL90 transformers


In this case new stat won't help either. Look over all the wiring and repair/replace any damaged or loose connections.
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