Remove Old Thermostat - Bryant TSTATBBNQ001 User's Information Manual

Step #2
Remove the cover of the old thermostat.
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If it does not come off easily check for
Heat Off Cool Fan On FanA uto
screws.
Loosen the screws holding the thermostat
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base or subbase to the wall, and lift away.
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Disconnect the wires from the old
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thermostat. Tape the ends of the wires
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as you disconnect them, and mark them
with the letter of the terminal for easy
reconnection to the new thermostat.
Keep the old thermostat for reference
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purposes, until your new thermostat is
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functioning properly.
Remove & Replace Old Thermostat
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