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-   -   Honeywell RTH7400 Wiring (https://www.askmehelpdesk.com/showthread.php?t=312223)

  • Feb 2, 2009, 08:13 PM
    TomM10
    Honeywell RTH7400 Wiring
    I am replacing an old thermostat that had 6 wires. It had W,O,G,R,C,and Y. I reconnected all but the O. I can't find any help where this wire should go or if it should be connected at all.
    Please advise. Thanks!
  • Feb 2, 2009, 08:26 PM
    MarkwithaK

    What kind of system do you have? Heat pump? Gas?
  • Feb 2, 2009, 09:05 PM
    TomM10

    I have an electric heating with central air conditioning unit.
    Thanks!
  • Feb 2, 2009, 09:06 PM
    MarkwithaK

    Heat pump?
  • Feb 2, 2009, 09:15 PM
    TomM10
    No sir.
  • Feb 3, 2009, 06:17 AM
    dac122

    Can you provide make/model of your air handler and outdoor unit; old thermostat model number and what color wire the O is and what terminal it was on that old stat.

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