I'm installing a hunter 44668 thermostat in my camper but when I removed the original thermostat there's only 3 wires hooked to it and there not labeled. The only labeling is under the terminals. 12v- = White wire, COMMS = Orange wire, 12v+ = Red wire. I need help figuring out which wire should go were on my new hunter 44668 System. Any help would be greatly appreciated!