Question about Honeywell Focus 6300B 5-2 Days Programmable Thermostat Heater

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I'm trying to install a Honeywell RTH2310B programmable thermostat. I only have 3 wires coming out of the existing thermostat (the red wire was attached to both Rc and Rh terminals). The other wires were attached to Y and W terminals. How do I wire to the new thermo?

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If the system worked before with three wires then the fan wire(green) must already be jumped to the Y terminal at the furnace. You should be able to run the red wire to Rh and Rc, run the white wire to W and run the yellow wire to Y on the new thermostat. You will not have control of the fan (ON or AUTO) from the thermostat. R is 24v from the furnace, W is the Heating circuit and Y is the Cooling circuit.

Posted on Jan 01, 2009

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Your house might be older.  Are your receptacles two-prong, or three?
I would ignore the missing "G" wire, and connect Red to both Rc and Rh, and Y to Y, and W to W.

Posted on Jan 01, 2009

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HONEYWELL WEBSITE:
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Under red welcome sign
Bottom red highlighted box literature/image search
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