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Old 09-14-2012, 12:37 PM   #1
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Terminal Function of TB1540E-G


I have a SECO TB1540E-G that has a brown wire connected to Terminal E. The thermostat controls an electric A/C unit and a gas furnace. Does someone know what function Terminal E controls? I need to know so I can properly connect a new programmable thermostat.

Thank you for any assistance.

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Old 09-14-2012, 01:53 PM   #2
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Terminal Function of TB1540E-G


E is usually for Emergency heat...back-up heat source, for example in a heat pump system to bring on the electric strip heat if the compressor heat can not keep up with demand. W is usually primary heat.

Can you follow the wire to the furnace and see what it is currently attached to on the furnace control board?

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Old 09-14-2012, 02:04 PM   #3
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Terminal Function of TB1540E-G


I'll see if I can trace the wire this weekend.
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