I purchased five wall heaters for hook-up in series in my basement. They are 240 volt and I'm setting them to 900 watts - which pull about 4.6 volts each. I've placed a 30amp double circuit breaker in my panel. The heater instructions tell me to run power first to the thermostat, then to heater. I ran orange #10 four-wire to the first heater. The thermostat has two wires, the heater three (red, black, greeen). Do I pigtail black to black and red to red on the thermostat and not use the white and ground wires; then on heater wire black to black, red to red and pigtail green, white and copper ground wires together?