Carrier Furnace Wiring Diagram - Heat Pump Thermostat Wiring Chart Diagram - HVAC - The following graphics are meant as a guide only. Always follow manufacturers instructions for both the thermostat and the HVAC system. Additional articles on this site concerning thermostats and wiring can help you solve your problem or correctly wire a new thermostat.. It showed up as a US Motors brand and had a time getting a wiring diagram on there site. Should work but dissapointed that I didnt get a GE direct replacement..