TL;DR: Can you terminate more than one common on the furnace C terminal?
I've linked a diagram of how my non-programmable thermostat is currently hooked up. I want to replace it with a Trane Z-Wave thermostat that requires constant power. There's already a blue wire in the 18/5 bundle, but it's disconnected on both ends. The C terminal on the furnace control board is already in use by the rooftop condenser. If possible, I'd like to connect the blue wire to the stat and terminate it on the same C terminal on the furnace that is already in use by the A/C.
Some model numbers:
- Furnace: Goodman GKS9 Gas Furnace with A/C (CAPF) - manual(PDF)
- Old stat: Honeywell TH3210D1004 non-programmable
- New stat: Trane TZEMT400BB3 Z-Wave