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    absogood's Avatar
    absogood Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 6, 2008, 08:16 AM
    Replace lennox thermostat with new honeywell RTH7400
    My old thermostat is to be replaced by a newer honeywell programmable RTH7400.
    The wires on my Lennox are as follows: O,G,Y1,R,L,T- ( jumpered to C ),W1,E.
    The W1 wire is connected to the old thermostat.
    Pretty easy here, but the T is not used anymore and the Y1, W1 wires ire throwing me off?
    Any input is greatly appreciated.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 6, 2008, 05:14 PM
    Y1= first stage cooling

    W1= first stage heating
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