What is the yellow triangle with the #2 in it? It looks as if the things labelled l1 and l2 are the wires within the line in. L1 is black (hot) i wager, and l2 would be white. So i can wire the road-in white to the white conductor at the fan. Then the line-in black (warm) goes to the fan side of the fan/limit manage. Stressed out to which conductor? White or black? If the thermostat is a easy transfer then i guess it does not depend. Then the other conductor (black or white) can get stressed to the black line at the fan. Also attached to the range, there may be a line in, a 3-conductor grounded line with a 3-prong plug on the end - for 120v power deliver. There's additionally a blower on the range, which takes 120v energy, and has 2 conductors - white and black. It forces the warmed air via the output duct. All of the wires are meet in a junction box, and none are linked.