blower panel kill switch

[John Dirks Jr]

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?

[Jim Katen]

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

[John Dirks Jr]

Ok.

Now, same furnace- It's a Fedders. Here's the serial #.

Anyone wanna take a stab at dating it?

I can't find charts to help me.

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[Mark P]

Got a model # and/or a pic of the furnace?

Fedders was made from 1967 - 1984 if that is any help.

[Jim Katen]

My recollection is that the date was keyed to the second letter of the serial number. But I have no key for it.

[John Dirks Jr]

Would it be 105N3D?

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[plummen]

74?

From what i remember of fedders condensing units they were spin off of trane which also made ge........

[Mark P]

1974

[hausdok]

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."

ONE TEAM - ONE FIGHT!!!

Mike

[John Dirks Jr]

I think I wrote something like;

It's beyond it's normal life expectancy. It was working on the day of the inspection but it might not be working tomorrow.