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-   -   Bay28x139 to honeywell rth110b (https://www.askmehelpdesk.com/showthread.php?t=481753)

  • Jun 21, 2010, 07:48 PM
    miki1043
    bay28x139 to honeywell rth110b
    My old thermostat has 8 wires and the honeywell rth110b only has 5 wires..
  • Jun 21, 2010, 08:13 PM
    wmproop
    The honeywell rth110b looks like its for 1H/1C meaning one heat/one cool system, if you are using 8 wires this probably means you have a heatpump and furnace for backup heat, so you have the wrong tstat if this is correct

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