![]() ![]() Power present here when any heating or cooling is operating in the HVAC system. Typical seven conductor thermostat cable, showing the color of each wire inside. With them you can avoid matching a wire to the wrong t-tat terminal. So, these color codes help keep all the wires straight. Each of these newer functions must have its own wire from the t-stat to tell it when to operate. Many also have a wire to turn on the compressor change over valve (switch it between heating and cooling mode), as well as a light (L) wire that often has a light connected to it within the t-stat. ![]() State-of-the-art HVAC systems these days, in addition to the original single stage heating provision, often include a second stage heater, as well as one or two stages of cooling (central AC). So here, we show examples of Honeywell Thermostat wiring color code for these higher wire count t-stats. Gone are the two-wire days, when all you needed was one wire from the furnace transformer, and the other to feed power to a gas valve or relay to turn the heat on and off. With so many new functions appearing on today’s modern thermostats (t-stats), there is of course, many more wires to connect up nowadays, when installing a new or replacement t-stat. ![]()
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