3 Wire Thermostat Wiring Diagram Hvac. The t6360b room thermostat l641a cylinder thermostat and honeywell. See the diagram below for what each wire controls on your system.
Connect to the thermostat wires skip to the next step if youre installing the nest thermostat on the stand and are using the usb cable for power. New thermostat for 3 wire system. The first element is emblem that indicate electric component from the circuit.
81 analogue dial display.
3 wire zone valves series. Wirsbo underfloor heating wiring diagram. Theres usually a diagram of the connections there. The old control panel and you will see what wires are what on the wiring diagram.