Basic thermostat wiring for furnace and air conditioner. Furthermore this thermostat wiring diagram is specifically for a system with two transformers.
Rc red wire power 24 vac rh or 4 red wire jumpered power 24 vac w white wire for heating enable y yellow wire for cooling enable g green wire controls fan on auto the diagram shows how the wiring works.
Wiring diagram for thermostat.
The o b wire can have many configurations. For the y y1 and y2 wires y or y1 will go to the y terminal and y2 will go to the y2terminal. If you have a two stage heat pump then you will also utilize terminal y2 for the second stage. I show where the wires go at the thermostat the color code then down at the furnace control board. Your system likely only has one transformer as most typical residential systems only use a single transformer for control. The basic heat a c system thermostat typically utilizes only 5 terminals.
This wire will go to the g terminal on your new thermostat. Just take a look at the picture below the diagram. It can be w o b o b w o w b or you mayeven have separate o and b wires. Let s take a look at the g wire. The red wire or 24 vac power lead is connected straight to the rc. If you do have two transformers then your old thermostat had a red wire on the rc terminal.
That is a basic honeywell thermostat wiring diagram for a single stage heat pump. However your connections may seem a little different on the thermostat itself.
House Thermostat Wiring Diagram Hvac Nissan Versa Radio
Dometic Single Zone Thermostat Wiring Diagram Free Download Schematic Ac 2011 Nissan Maxima Fuse Box
