Carrier Infinity Thermostat Installation Instructions

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Things You'll Need

  • Masking tape

  • Screwdriver

  • Pencil

  • Small square sheet of plastic

  • Infinity digital thermostat

  • Small spirit level

  • 3/16-inch drill bit

  • Cordless drill driver


Many older home thermostat wires are incorrectly color-coded. However, the initials "G," "Y," "W" and "R" on the old thermostat refer to green, yellow, white and red wires. If the color coding in your wiring corresponds to the initials stamped on the old thermostat, there is no need to label the wires before disconnecting them. Simply connect the wires to the connecting block inside the Infinity mounting plate as follows: green wire to the "A" terminal, yellow wire to the "B" terminal, white wire to the "C" terminal and red wire to the "D" terminal.

Carrier Infinity thermostats offer remote access to your temperature settings via the telephone or by going online. This allows you to adjust your home's comfort setting to suit rapidly changing weather conditions while you're on the road or from your office. With one of these units installed in your weekend cabin or vacation home, you can turn heating and cooling systems on and adjust the temperature settings a few hours before arriving for your weekend break or vacation. Follow a few simple step-by-step procedures, and replace your old unit with a digital Infinity thermostat in less than 30 minutes.

Step 1

Turn the air conditioner and furnace breaker switches on the main electrical panel to the "Off" Position. Put a strip of masking tape over both switches to prevent someone else from accidentally restoring power while you're working on the system.

Step 2

Remove your old thermostat from the wall by lifting the cover off and undoing the two attaching screws, using a screwdriver. Label each wire with the letter code of the terminal that it's connected to, using a strip of masking tape and a pencil. Disconnect the terminals with a screwdriver and set the old unit off to one side.

Step 3

Cut a small square sheet of plastic slightly bigger than the hole in the wall, and snip a small hole through the center of the sheet just big enough for the wires to pass through. Route the wires through the cut plastic, through the decorative back plate and then through the hole in the mounting plate. Wrap the wires around a pencil to prevent them from falling back into the wall.

Step 4

Fold the small plastic sheet out of the way, place the mounting plate against the wall and level it with a small spirit level. Mark the position of the mounting holes by tracing their outline through the holes in the mounting plate and onto the wall, using a pencil.

Step 5

Drill two 3/16-inch holes into the marks on the wall, using a cordless drill driver. Insert the two plastic anchors provided into the holes in preparation for the mounting screws, which will be inserted later.

Step 6

Connect the wires to the connector block inside the mounting plate with a thin screwdriver as follows: wire labeled "G" to the "A" terminal, wire labeled "Y" to the "B" terminal, wire labeled "W" to the "C" terminal and wire labeled "R" to the "D" terminal. Push any unused wires back into the hole in the wall.

Step 7

Tape the small square sheet of plastic to the wall with masking tape to prevent air circulating inside the walls from interfering with the thermostat. Clip the mounting plate onto the decorative back plate and position it against the wall. Insert the two mounting screws provided through the mounting holes and then through the plastic sheet, and fasten the screws in the anchors you fitted earlier, using a screwdriver.

Step 8

Line up the guides on the back of the Infinity control unit with the matching recesses in the mounting plate, and then push the control unit onto the mounting plate until it snaps in place.

Step 9

Perform the Infinity thermostat setup procedure as directed in the installation instructions. Restore power to the air conditioner and furnace by resetting the breaker switches. Adjust the temperature up and down to make sure the air conditioner and the furnace are both cycling on and off correctly.


Ian Kelly

After graduating from the University of the Witwatersrand and qualifying as an aircraft engineer, Ian Kelly joined a Kitchen remodeling company and qualified as a Certified Kitchen Designer (CKD). Kelly then established an organization specializing in home improvement, including repair and maintenance of household appliances, garden equipment and lawn mowers.