Looking at the back of a Mears (M21DP 4 wire line voltage), there are 2 red wires (top left and right) and 2 black wires (bottom left and right). I am replacing this with a Honeywell. Looking at the back of the Honeywell, there is a red wire (top left labeled "T2" and bottom left labeled "L2"). On the right. Red wire (top right labeled "T1" and bottom right labeled "L1"). How do I match up the Mears configuration to the Honeywell?