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John Dirks Jr

blower panel kill switch

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I'm wondering when the switches that kill the blower when the panel is removed on furnaces were first installed as part of the system?

Anyone know about what year?

My guess is 1982 but I have nothing at all to back it up.

- Jim Katen, Oregon

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What about the chart that fellow posted here some months ago?

According to that chart:

FEDDERS: Through 1977, the last two letters of the serial number show the month/year of manufacturre, beginning with September 1964. Example: xxxxAA = Sept 66, xxxxBC = Oct 68. (The letter I is not used.).

Maybe it should have read "The two letters of the serial number" instead of "The last two," if so, that furnace was manufactured in November of 1970.

A 41 year old gas furnace? If I were you, I would have said and written something like, "Don't be surprised if this thing fails as I'm backing my truck out of the driveway; it's at about twice its normally expected service life."



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