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Step 5: Install the wiring module (Optional)
Note: Check your wires, see if there's C-wire. If you have the C-wire,
skip this step 5 and go to step 6, if you don't have the C-wire, go on
step 5.
The C-wire provides power to the smart thermostat, if you don't
have a C-wire in your old system, you need to install the wiring
module to use the exiting wires to power your thermostat.
1. Find the control board of your HVAC system, use the tags
provided to label the wires from the control board to the
thermostat.
2. Disconnect the R/RC, W-O/B, Y, G wires form the control board
and reconnect them correspondingly to the 4 terminals side of the
wiring module. For Y-wire and G-wire, you can connect the Y-wire to
S-terminal, G-wire to C terminal, then change the label of the Y-wire
to the S-wire, the G-wire to the C-wire. Take a picture of your wires
with new label to help you remember.
Control board
Thermostat
