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-   -   Lennox 51m33 (https://www.askmehelpdesk.com/showthread.php?t=624986)

  • Jan 4, 2012, 08:59 PM
    netdecal
    Lennox 51m33
    I want to upgrade my thermostat to a Honeywell TH6220D
  • Jan 5, 2012, 06:29 AM
    wmproop
    OK,, go ahead
  • Jan 5, 2012, 06:31 AM
    wmproop
    Be sure to turn off power to furnace before you start
    Also might be wise to tag each wire as you remove from each post of old tstat, so you have no confusion as to what color goes to what post of the new tstat

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