No "C" terminal on gas furnace control board


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Old 07-22-12, 03:56 AM
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No "C" terminal on gas furnace control board

Im installing the wifi 3M-50 T-stat and need to pull a 24vac feed direct from my 1992 Lennox furnace to the Tstats C terminal.

My furnace control board has R, W, Y, G, and T.

Any suggestions on picking up 24vac?

Thanks
 
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Old 07-22-12, 04:05 AM
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What is the model # on the furnace?
 
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Old 07-22-12, 05:41 AM
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Jay-

It's a Lennox Pulse. Unit is mounted in the crawl space - Im tied up for an hour, I'll grab nameplate data as soon as I can.

Thanks
 
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Old 07-22-12, 06:52 AM
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T is your common on the Lennox. Since you have a Pulse, when the last time you had a full check up, and pressure test done to this furnace?
 
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Old 07-22-12, 07:11 AM
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Jay,

Last tune-up on this unit was performed 10/2010. They did not replace any components.

Thanks for the info on T Terminal, I'll be able to finish wiring this afternoon.

Why does Lennox refer to this as T and not C?

Thanks
 
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Old 07-22-12, 07:17 AM
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Has the flapper ever been replaced on it? If not, I'd plan on having ti done.

Lennox was an odd ball system. They did not use the "standard" low voltage hook up like the others did.
 
 

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