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DAIKIN SERVICE CHECKER COMPATIBILITY CHART CODE High voltage systems typically have a thermostat that is labeled 120 V or 240 V, and has two thick wires with wire nuts. High voltage systems, such as electric baseboard heaters, aren’t compatible with Nest thermostats. In some cases, it’s possible that your system can be made Nest thermostat-compatible. DAIKIN SERVICE CHECKER COMPATIBILITY CHART INSTALLĬontact a local pro and have them install a step down transformer to 20 - 30 V. Save a picture of your current thermostat’s wires in case you need help later. If your thermostat’s connectors have two labels Make sure that the connector labels are readable. What to do if your thermostat’s wire connectors have two labels Refer to the following article for more information: It can be hard to determine which set of labels to use in the compatibility checker. Simply enter which connectors have a wire and ignore the color of the wires. This is because not all systems are connected to the thermostat with the same wire colors.įor instance, don’t enter R in the Compatibility Checker if you find a red wire, or W if you find a white wire. The label on the wire connector is what you should enter.

So check R if there’s a wire of any color in your thermostat’s R connector. If your thermostat has a short “jumper” wire between two connectors, don’t include that wire. Only enter the labels for wires coming from inside your wall that are attached to the thermostat. For instance, in the illustration on the right, you would only enter Rh, Y1, G and C wires into the checker. You would not enter Rc in the checker, because it is only connected by a jumper. Two stage heat pump with separate two stage furnace heating (Dual fuel) 1, 2 Two stage heat pump with or without AUX heat Single stage heat pump with separate two stage furnace heating (Dual fuel) 1 Single stage heat pump with separate single stage furnace heating (Dual fuel) 1 Single stage heat pump with or without AUX heat Two stages of heating with one stage of cooling Single stage heating with two stages of cooling Heat only or cool only C wire or Nest Power Connector required Heat only, cool only, or heat pump systems There are some key differences between Nest thermostats and what systems will work with each. Two stages of cooling and two or three stage furnace heating 2ġ Your system requires advanced configuration and wiring. If you have one of these systems, contact a local pro. Important: Professional installation is recommended for some systems since their wiring and setup can be complicated.