Wards Thermostat Wiring Diagram. Here are the 3 wires. The brown wire thats the live one it connects to the l terminal.
The nest thermostat doesnt need jumpers. Marley thermostat wiring diagram line voltage thermostats for heating cooling. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan.
Additionally unless you have a millivolt system or electric baseboard heating gas logs typically then your system will be low voltage.
Wards thermostat wiring diagram. Follow the first diagram because you have a gas boiler there dont you. Finally the third thermostat diagram showing the average type of split system with an air conditioner or gas or oil furnace used for heating. Installing the heat link.