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-   -   Honeywell RTH221b (https://www.askmehelpdesk.com/showthread.php?t=282835)

  • Nov 19, 2008, 11:14 AM
    baxters801
    Honeywell RTH221b
    I am trying to replace a very old thermostat that only has two wires, a red and a white. I am not sure about the wiring to the new Honewell...
  • Nov 19, 2008, 01:07 PM
    hvac1000
    Red wire to RH and the White wire to W

    Owners manual

    http://customer.honeywell.com/techli...69-2060EFS.pdf

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