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I would try this link ..Usually you will have a Red from fan center to your high speed blower(usually black from motor)That is your cooling speed if you have a/c..You will have a brown from fan center to the limit switch.Coming from the limit switch (when it closes) a wire to your low speed blower(usually red from motor)This is your heating speed.Then two blacks One from transformer and the other from fan center tied together going to Line voltage(Black) This feeds power to transformer and fan center.Then you will have white from transformer to Neutral (line in wires.) Check out figure 2 on page two. Let me know if link works.Hope this helps.
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