I am trying to install a janitrol hpt18-60
I only have 4 wires coming in, red, green, white, and blue.

Does anyone know where they connect to

Need a wiring diagram for a janitrol hpt 18-60, I do not have a heat pump, my incoming wires are red, white, blue, and green
Have tried several combos, white to e+w-2, don't know what blue is.no blue screw