Outrageous Standard Thermostat Wire Colors
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The white wire connects to your heat.
Standard thermostat wire colors. The white wire underneath your thermostat connects to your heating system. It s usually black but in some cases it s the thermostat blue wire. The red wire should always come from the hot side of the 24 volt transformer.
Nominal wire color 1. Here is the industry standard thermostat wire color code used for most systems. Color codes for 24v thermostat wires are divided into two groups.
If you do not know what you are doing then please call a professional. My paperback and e book. Function b blue orange.
The white wire connects to terminal w in industry standard thermostats. The green wire connects to the fan. We give a summary tables of both traditional and current thermostat wire color code keys above.
To install your unit you ll need to connect the correct wires to the terminals on the back of your new thermostat. These colors are used as follows. What are the wire colors for a thermostat at this point you should have a certain number of wires sticking out.
The common wire doesn t have a standard color. Understanding thermostat wiring colors is the next step. Used on some systems including rheem ruud hvac systems.
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