Installation Instructions - York LX series Owner's Manual

Installation Instructions

Remove & Replace the Old Thermostat
To install the thermostat properly, please follow these step by
step instructions. If you are unsure about any of these steps,
call a qualified technician for assistance.
Assemble tools: Flat blade screwdriver, wire cutters and wire
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Make sure your Heater/Air Conditioner is working properly
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Carefully unpack the thermostat. Save the screws, any brack-
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Turn off the power to the Heating/Air Conditioning system at
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breaker for disconnecting power to the furnace.
Remove the cover of the old thermostat. If it does not come off
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Loosen the screws holding the thermostat base or subbase to the
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Disconnect the wires from the old thermostat. Tape the ends
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letter of the terminal for easy reconnection to the new thermo-
stat.
Keep the old thermostat for reference purposes, until your new
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