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

    Dec 17, 2008, 08:56 AM
    basic 2 term thermostat to lennox furnace
    older lennox elec. Furnace. Ser. no. 5879h 13784 would like to wire basic 2 terminal thermostat. Which wires to couple? Red=heat relay1 orange=heat relay2 yellow=tranformer blue= transformer black=multiterminal conn brown=same multiterminal conn. Don't recognize multiterminal conn. Seem to be made of bakelite
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 17, 2008, 10:50 AM
    On most furnaces the R=RED and the W=WHITE are the terminals that are used to activate the heat circuit.
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