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-   -   How to upgrade honeywell thermostats, T841A to T8411R (https://www.askmehelpdesk.com/showthread.php?t=281513)

  • Nov 16, 2008, 08:27 AM
    gregriggsinc
    How to upgrade honeywell thermostats, T841A to T8411R
    I have a honeywell T841A thermostat wired as follows:
    G - GREEN WIRE
    R - RED WIRE
    E - JUMPERED TO W2 TERMINAL
    X - BROWN WIRE
    W2 - WHITE WIRE
    B - BLUE WIRE
    W1 - JUMPERED TO Y1 TERMINAL
    Y1 - YELLOW WIRE
    O - NOT USED
    L - NOT USED

    How do I connect these wires to the Honeywell T8411R?

    I came up with this:

    R - RED WIRE
    W2 - WHITE WIRE
    L - NOT USED
    B - BLUE WIRE
    O - NOT USED
    W1 - JUMPERED TO Y TERMINAL
    Y - YELLOW WIRE
    E - JUMPERED TO W2 TERMINAL
    G - GREEN WIRE
    C - BROWN WIRE

    Will this work?
    Thanks

    This is connected to a Rheem Heat Pump.
  • Nov 16, 2008, 03:55 PM
    hvac1000
    8411R diagram

    http://customer.honeywell.com/techli...it/69-1486.pdf

    841A diagram

    http://customer.honeywell.com/techli...0s/69-0452.pdf
  • Nov 16, 2008, 04:04 PM
    gregriggsinc
    Thanks Hvac1000,
    I have the diagrams but not sure I interpreted them correctly, do you think my proposed wiring will work?
    Thanks
  • Nov 16, 2008, 06:02 PM
    hvac1000
    1 Attachment(s)
    Quote:

    Originally Posted by gregriggsinc View Post
    Thanks Hvac1000,
    I have the diagrams but not sure i interpreted them correctly, do you think my proposed wiring will work?
    thanks

    I believe it should work but look over this chart of old to new HP wiring codes for yourself.
  • Nov 17, 2008, 05:09 AM
    gregriggsinc

    Thanks Again! This will get me on track.
  • Nov 17, 2008, 06:19 AM
    dac122

    I think you are good. If you're a little unsure just wire a little and test a little. First just power, then fan, then aux heat, then the rest.
  • Nov 17, 2008, 03:11 PM
    hvac1000
    Hopefully that chart will help. Make sure to post back and let us know how it all came out.

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