Basic Thermostat Wiring Diagram. 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. Red now there can be two separate wires for this.
The red wire or 24 vac power lead is connected straight to the rc 4 terminals. S indoor and outdoor wired sensors. Furthermore this thermostat wiring diagram is specifically for a system with two transformers your system likely only has one transformer as most typical residential systems only use a single transformer for control.
Furthermore this thermostat wiring diagram is specifically for a system with two transformers your system likely only has one transformer as most typical residential systems only use a single transformer for control.
If you have a two stage heat pump then you will also utilize terminal y2 for the second stage. Basically ive cut the female end off a 3 prong power extension cord wired the greenyellow ground wire to the ground on the thermostat wire is obscuring the ground symbol in the photo but im certain its in the right spot. Orange this wire connects to your heat pump if you have one. The wires to the ports on the thermostat that match the connectors on the furnace or air conditioning system using the wiring diagram.