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    chris17's Avatar
    chris17 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 1, 2007, 05:13 PM
    Replacing Honeywell T4039M with a Honeywell RTH6300B
    We only have wire colors on the old thermostat and can not match up the letters with the new thermostat (Honeywell RTH6300B)
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 1, 2007, 05:58 PM
    NOTE your old thermostat is a line voltage unit see below.

    http://customer.honeywell.com/techli...it/60-2241.pdf

    Your new thermostat is for 24 volt low voltage. IT IS NOT GOING TO WORK IN YOUR APPLICATION. Read below.

    http://customer.honeywell.com/techli...0s/69-1717.pdf
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