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-   -   Honeywell programmable thermostat #RTH230B (https://www.askmehelpdesk.com/showthread.php?t=146578)

  • Oct 30, 2007, 07:09 AM
    geames
    Honeywell programmable thermostat #RTH230B
    How do I place the wiring with 2 wires-- one black and one yellow?
  • Oct 30, 2007, 04:29 PM
    hvac1000
    R and W. for heat only
  • Oct 30, 2007, 08:28 PM
    labman
    More likely RH and W.
  • Oct 30, 2007, 11:03 PM
    hvac1000
    labman is probably correct. I usually end up tying the two R legs with a jumper because of the AC and same transformer. That tells you how long it has been since I wired up for heat only.

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