SantiJS, try this first, on the nest backplate, put the red wire in Rc. Afterwards, check the EQUIPMENT status. To do this, open MENU, rotate dial to EQUIPMENT and select. You will see a Nest backplate and the wire the nest has detected. If the wedge is green, it is OK. If it is Yellow, it is not recognized or tested yet. So, here is a little explanation of the HVAC control system.
Rc and Rh or R, is the Power IN from the step down transformer. Why is there separate Heating and Cooling power IN? Sometime the heating system is a separate system. Most standard thermostat are setup with the primary input for power on the cooling side with a jumper wire to the heating Rh. The Thermostat takes that incoming power and send out the control wires for the heating, cooling and fan. The Power COMMON is the C terminal. The Heating call is sent on the W or W1 terminal. And Cooling call is sent on the Y or Y1 terminal. The Blower Fan is sent on the G terminal.
Ken, The AC Cooling Wizard
NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
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