This video contains 10 wiring diagrams always follow manufacturer wiring diagrams as they will supersede these supervision is needed by a licensed hvacr tech while doing this as experience and . Step by step this is stripping the wires and installing a 24 volt thermostat i go over which terminal letter each color wire should be connected to this video shows how to strip the outer . Thermostatic wiring principles by bob scaringe phd pe basic thermostat types many technicians have great difficulty understanding how to properly wire a thermostat or how to replace a thermostat with a different thermostat in fact the wiring of a thermostat is quite simple circuitry the confusion arises principally because. In the most basic system this functionality is provided by use of a fan center relay and the low voltage wiring to the thermostat now will require a minimum of three wires for heat only units and four wires for heat cool fan for control this additional terminal is labeled g in the thermostat. Incompatible wiring and voltage stranded wires stranded wires arent compatible with the nest thermostat high voltage wires if your thermostat is labeled 120v or 240v or has thick wires with wire nuts or has l1 and l2 terminal blocks your system is high voltage and isnt compatible with the nest thermostat
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