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Green wire is for the fan. Mini-splits have an indoor air handler with a fan; the power input that goes into the fan is regulated by the green or “G” wire. Yellow Thermostat Wire (“Y1” And “Y2” Wire) If you’re planning to replace the old thermostat, don’t immediately remove the old thermostat. First of all, make sure you will be able to correctly wire the new thermostat. The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a “C” or “Common” wire. That’s why we only need two wires. This is a 2 wire thermostat wiring color code: Some boilers have both volt free and mains voltage switching options. In these instances, either one can be used, however the two sets of terminals must never be interconnected, or used at the same time. Doing so will most likely cause damage to the boiler. Ebus
wire thermostats are most commonly used to control the heaters; boilers and hot water heaters in particular. The 3 wires you will find usually have codes R, G, and W.The Nest might work without the need for a C wire, if you get the right model. They normally have a charge point for the battery that connects to a phone charge cord.
Spreading them apart will create at least a 2×2 inch crosssection, and the wires will be suspending on the wall (instead of on the thermostat).A 2 wire thermostat is connected between line and the switched line terminal on the boiler. When heat is required, the thermostat connects these two wires together, applying the full mains voltage to the switched line terminal. This activates the boiler. LearnMetrics has designed this guide as that little help. We will cover everything you need to know about thermostat wiring; including where does each color wire goes. Put the new motherboard in the place of the old one, and pull the wires through the 3 wire thermostat. Programmable thermostats. The Honeywell RTH6580WF you have is an example of a Wi-Fi programmable thermostat.