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    gregriggsinc's Avatar
    gregriggsinc Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Nov 16, 2008, 08:27 AM
    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.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 16, 2008, 03:55 PM
    8411R diagram

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

    841A diagram

    http://customer.honeywell.com/techli...0s/69-0452.pdf
    gregriggsinc's Avatar
    gregriggsinc Posts: 4, Reputation: 1
    New Member
    		  
    #3

    Nov 16, 2008, 04:04 PM
    Thanks Hvac1000,
    I have the diagrams but not sure I interpreted them correctly, do you think my proposed wiring will work?
    Thanks
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Nov 16, 2008, 06:02 PM
    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.
    Attached Images
  1. File Type: pdf heat pump wiring.pdf (13.3 KB, 216 views)
    2. gregriggsinc's Avatar
    gregriggsinc Posts: 4, Reputation: 1
    New Member
    		  
    #5

    Nov 17, 2008, 05:09 AM

    Thanks Again! This will get me on track.
    dac122's Avatar
    dac122 Posts: 463, Reputation: 17
    Full Member
    		  
    #6

    Nov 17, 2008, 06:19 AM

    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.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #7

    Nov 17, 2008, 03:11 PM
    Hopefully that chart will help. Make sure to post back and let us know how it all came out.
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