Installer Guide 1
1 Remove and 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.
• Installation tools: Small flat blade screwdriver, Phillips screwdriver, wire
cutters and wire strippers.
• Make sure your Heater/Air Conditioner is working properly before
beginning installation of the thermostat.
• Carefully unpack the thermostat. Save the screws, any brackets,
and instructions.
• Turn off the power to the Heating/Air Conditioning system at the main fuse
panel. Most residential systems have a separate breaker or switch for
disconnecting power to the furnace.
• Remove the cover of the old thermostat. If it does not come off easily,
check for screws.
• Loosen the screws holding the thermostat base or subbase to
the wall and lift away.
• If you have a smart phone handy, take a photo of the wiring for
future reference.
• Disconnect the wires from the old thermostat. Tape the ends of the wires
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 purposes, until your new thermostat
is functioning properly.
2 Installation Instructions
PSP4273_Installer man.indd 1PSP4273_Installer man.indd 1 6/9/21 11:23 AM6/9/21 11:23 AM
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