Question about Honeywell Programmable Thermostat Heater

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You: Hi. I am installing a Honeywell wifi rth6500wf replacing a American standard thermostat. I have an extra wire for the c terminal, but there is no c connection on the furnace terminal block. There is an empty terminal marked twin and the red and white power wires are connected to the b and y connections. Which connection should I use to provide power to my new unit

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You should have more wires than just two, and you should also only have 1 power wire at the thermostat. Red is usually the power, white is usually for heat, unless it's the wires going to the outside unit. On a normal system, those two wires are the power and common going to the contactor. Heat pumps have more. However, you will not actually need a common terminal, all commons are just grounded to the units housing, therefore your common is nothing more than a ground wire. Hope this helps!

Posted on Dec 08, 2013

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