Hello,
carefully follow the below steps;
Turn off the circuit breaker that controls the air conditioning system.
Turn the thermostat to the "On" position to make sure that all power is
cut off and the air conditioner cannot accidentally operate.
Remove the cover of the existing thermostat and remove the colored wires
from the terminals. Take out any screws that secure the thermostat to
the wall, and remove the thermostat.
Mount the new thermostat on the wall. Feed the wires through the unit,
with enough slack to allow you to make the new connections.
Connect the red wire to the thermostat terminal labeled "RH," "RC" or "R." The red wire carries the power from the transformer.
Connect the green wire to the thermostat terminal labeled "G." This controls the relay that controls the fan. Attach the yellow wire to the "Y" terminal of the thermostat. This powers the main control. Connect the white wire to the "W" terminal. This is the heating control wire.
Close the thermostat's cover and turn the breakers back on. Turn the new thermostat to the "On" position to test it and that would be all.
I hope the above helps. If it is not helpful, please let me know so that I may direct you further.....
Good luck.
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