11-28-2021 02:43 PM
I have a FCU system and my old thermostat only had these wires - R, G, G2, G3, and C. I have wired it correctly but the thermostat lady’s I must have a Y1 or W1 wire. The system is a 2 pipe system so I get whatever is supplied by my condominium. I checked Nest for compatibility before purchasing and was told it was.