Got a free smart tstat from the electric company. Took off old tstat took picture, went to basement to check colors on the unit and r, w, and g matches up but the blue wire is connected to c on hvac board and y on tstat. Y is unused on hvac board.
Installed a c wire kit that came with tstat, which connected y and g at tstat to a diode that returned to hvac on blue to connect to a box with other wires. Hooked everything up per instructions got beat working but for ac, the compressor doesn't come on, the fan does.
Could I just g for common instead? I work with industrial hvac units but this small thing is baffling the hell out of me.
*** EDIT *** @ThreePhaseEel @jwh20 @Harper - Reinstate Monica
2 wires - red and white exiting to the right on lower wire are going to the condenser outside. 4 wires - red, white, green, blue exiting to the right on top wire are going to tstat. 4 wires - red, white, green, blue exiting bottom conduit go to air handler board
So, blue wire from c terminal on handler goes to white wire on condenser, blue wire from y terminal on tstat goes to red wire going to condenser.
red, green, white from tstat go to red green white on handler.
Only 4 wires to and from tstat 2 wires to condenser 5 wires going to air handler (Hey, theres that yellow wire)
How can I hook up my emerson sensi smart tstat?
Right now I am using green as common to get power to tstat, heat and fan work, condenser works but no fan.
How to I wire tstat as is or use the included c wire kit?