Question about Honeywell Programmable Thermostat Heater

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Installing Honeywell RTH7000 - I have too many wires!

I am replacing a Honeywell dial thermostat from 1995 on a gas fired forced air system with an airconditioning unit attached, with a Honeywell RTH7000 programmable thermostat. The house has two zones and I am only replacing the thermostat on the first floor. When I removed the old thermostat I have 6 wires - R-red, Y-blue, G-green, B-black, W-white, O-brown. The manual does not show where an O wire is connected. The old thermostat has a fan setting for On - Off and Auto on one side and on the other side it is Heat Off Cool. Any help would be appreciated!

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  • MegBarnes Oct 26, 2008

    Thanks, I'll try connecting it that way and see what happens!

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Check to see if the B terminal is on the new t-stat if connect to it , but this terminal refers to heat pumps and is normally use to energize the reversing valve on the outside unit and not used on ac units , but normally the tag O/B is the same terminal on therostats

Posted on Oct 26, 2008

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