12-06-2021 10:14 AM - edited 12-06-2021 10:16 AM
Hello,
Current setup has only 4 wires connected, but I found 4 additional wires back of the panel.
Should I install all 8 wires, or
just current 4 wires + C wire?
I also need to identify which color wire is C-wire(blue or black)
Current SETUP
Yello -> Y
White -> O
Green -> G
Red -> R
, Found 4 More Wires. Black, Blue, Brown, Orange
Thanks.
12-06-2021 11:11 AM
The compatibility checker might be helpful in your situation.
https://store.google.com/us/widget/compatibility/thermostat
In general, and best practice is NOT to connect wires that are not needed or used for the thermostat and HVAC system. Just tuck them in the wall or out of the way in case they are needed in the future.
It is possible Blue, Black or maybe one of the other 2 tucked wires is "Common". Often it is blue. However if it is not connected at the HVAC equipment it won't be much use to the thermostat. You can check:
NOTE: I am not an HVAC specialist. Use caution when testing wires. If you decide to check the HVAC equipment make sure power is OFF first!!! Consult an expert if needed.