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-   -   Replacing Honeywell T4039M with a Honeywell RTH6300B (https://www.askmehelpdesk.com/showthread.php?t=158155)

  • Dec 1, 2007, 05:13 PM
    chris17
    Replacing Honeywell T4039M with a Honeywell RTH6300B
    We only have wire colors on the old thermostat and can not match up the letters with the new thermostat (Honeywell RTH6300B)
  • Dec 1, 2007, 05:58 PM
    hvac1000
    NOTE your old thermostat is a line voltage unit see below.

    http://customer.honeywell.com/techli...it/60-2241.pdf

    Your new thermostat is for 24 volt low voltage. IT IS NOT GOING TO WORK IN YOUR APPLICATION. Read below.

    http://customer.honeywell.com/techli...0s/69-1717.pdf

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