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Age of Trane XL90 (no serial)

Richard Moore

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Had a Trane XL90 furnace today, strangely with no data plate/sticker anywhere to be found, inside or out. The home was 1981 but had a Trane A/C unit from 5/1989.

All I could find was the following table on the wiring label on the cover panel...

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...so I assume it's one of those models. I've tried googling variations of the models without any success at all. Unit was serviced in January this year and ran without problems. My gut tells me it was newer than 1981 but I was wondering if anyone in TIJland could tell by the model numbers alone?

Thanks (maybe),

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