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== How to Install a Rheem and Ruud Thermostat ==Using a voltmeter, check there is no power still flowing to the thermostat. Your wires should have been labelled according to their position in the old thermostat. Color can also help signify the correct placement of wires.The return wire is usually red and labelled R, VR-R, or V-VR. This connects to the R terminal on your Rheem and Ruud thermostat. The stage one heating and cooling wire is typically yellow and labelled Y, Y1, or M. This connects to the Y terminal. The reversing valve wire for cooling is typically orange (but is occasionally blue) and labelled O or R. This connects to the O terminal. Your thermostat may also have the reversing valve wire for heating, labelled B, which should be connected to the B terminal. If you don't have this wire, cap the terminal with a wire nut. The fan control relay wire is typically green and labelled F or G, and should be connected to the G terminal.There are also second stage hearing a cooling circuit wires which need connecting. The cooling circuit wires are typically blue and labelled Y2. The hearing wires are usually pink and labelled W1, W2, or W-U. These must be connected to their terminals.Next, you'll need to connect the LED system monitor wire, which is usually labelled X and can be blue, brown, tan, or gray. This wire needs to connect to the L terminal. Then, connect the emergency heating wire, which is almost always labelled E and can be blue, pink, gray or tan.Finally, connect the 24-volt transformer wire, which will be labelled C, X, or B, to the terminal labelled C. This wire may be blue, brown or black.You can now install your new Rheem and Ruud thermostat cover and turn on the power to test your thermostat. If it does not work, disconnect the power and repeat the steps above, checking each wire and each terminal.