The difference between 2 wire and 3 wire thermometer is the “G” or green wire that is usually used for fans. In the 3 wire thermostat wiring, the green wire serves as a repurposed C or “Common” wire. Here are the 3 wires: Red wire for power (24V). White wire for heating (connected to W or W1 terminal). Green wire as a repurposed C wire.[PDF] 24 Volt Heat Only Thermostat Wiring Diagram [PDF] 24-volt-heat-only-thermostat-wiring-diagram 2/5 Downloaded from skeezickrtowlgames on May 16, 2022 by guest and more than 400 new and revised figures and images. Drawing on decades of industry experience, the authors also cover the all-important soft skills and customer relations issues that today's professionals need to Related searches for 24 volt wire diagram on thermostat 24v transformer for thermostat wiring24v transformer thermostat wiring diagramthermostat wiring 24v24 volt wiring schematic24v relay diagram24 volt thermostat relaycentral boiler thermostat wiringboiler zone valve wiring diagrams