![20+ year old Trane XV80 gas furnace - can I use thermostat "B" connector as the "C" wire? : r/hvacadvice 20+ year old Trane XV80 gas furnace - can I use thermostat "B" connector as the "C" wire? : r/hvacadvice](https://preview.redd.it/20-year-old-trane-xv80-gas-furnace-can-i-use-thermostat-b-v0-jf5q3eooc4aa1.jpg?width=1080&crop=smart&auto=webp&s=7747bb101af5c59061ffbd5d7b4702b1da273793)
20+ year old Trane XV80 gas furnace - can I use thermostat "B" connector as the "C" wire? : r/hvacadvice
![Trane XV80 Variable speed gas furnace Installed by A-1 Heating and Cooling www.A1HC.com 40… | Furnace installation, Heating and air conditioning, Commercial heating Trane XV80 Variable speed gas furnace Installed by A-1 Heating and Cooling www.A1HC.com 40… | Furnace installation, Heating and air conditioning, Commercial heating](https://i.pinimg.com/564x/3a/68/c8/3a68c8804f33c2f593d420d5831b5f78.jpg)
Trane XV80 Variable speed gas furnace Installed by A-1 Heating and Cooling www.A1HC.com 40… | Furnace installation, Heating and air conditioning, Commercial heating
![20+ year old Trane XV80 gas furnace - can I use thermostat "B" connector as the "C" wire? : r/hvacadvice 20+ year old Trane XV80 gas furnace - can I use thermostat "B" connector as the "C" wire? : r/hvacadvice](https://i.redd.it/20-year-old-trane-xv80-gas-furnace-can-i-use-thermostat-b-v0-alp817mrc4aa1.jpg?width=2560&format=pjpg&auto=webp&s=62128711fff6546e9d419796279416e7cf5e947d)