Replacing a 2 wire thermostat with a 4 wire
I want to upgrade my old mechanical thermostats with new digital programable types. The old ones have only two wires which are black and connected to two black wires in the outlet box. The two white wires in the box are connected to each other. The new units that I want to install have four wires, two white and two black. The new units are of correct volts (240) and amp capacity. Can I simply connect the black wires from the thermostat to the black in the outlet box and white to white? So the question is - Can a four wire thermostat replace a two wire unit with this wiring configuration? Thanks for any help!