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    reennee1000's Avatar
    reennee1000 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 9, 2010, 06:26 PM
    Replacing Lennox 51h4301 with a Honeywell RTH7600
    Looking for the wiring match-up to replace my existing thermostat 51H4301 to a Honeywell RTH7600 unit. My outside unit HP21-511-4P and the inside unit is CB19-51-3P-TXV.

    The current wiring for the thermostat is:
    O
    G
    C
    R
    T
    W1 - two tied together on one screw
    Y1
    Y2

    Can anyone help?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #2

    Dec 9, 2010, 06:51 PM
    If you can give us the wire match up (color)of the old thermostat we can walk you through it. Or check out.customer.honeywell.com/Honeywell/getliterature.axd?LiteratureID
    reennee1000's Avatar
    reennee1000 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Dec 9, 2010, 07:06 PM
    Comment on T-Top's post
    The wire match up on the old thermostat is:

    O - Orange
    G - Light green
    C- Green
    R - Red
    T - Brown
    W1 - a Red and a White
    Y1 - Yellow
    Y2 - Black

    Does that help?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #4

    Dec 11, 2010, 06:19 PM
    All should match up the same way. You can tape or cap off the brown wire "T" it is used for a outside thermostat. Set your new thermostat up for heatpump 2 stage coolng 3 stage heat.
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