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The basic heat a c system thermostat typically utilizes only 5 terminals.
Wiring diagram for thermostat. Your system likely only has one transformer as most typical residential systems only use a single transformer for control. Just take a look at the picture below the diagram. For the y y1 and y2 wires y or y1 will go to the y terminal and y2 will go to the y2terminal.
However your connections may seem a little different on the thermostat itself. Basic thermostat wiring for furnace and air conditioner. Furthermore this thermostat wiring diagram is specifically for a system with two transformers.
I show where the wires go at the thermostat the color code then down at the furnace control board. If you have a two stage heat pump then you will also utilize terminal y2 for the second stage. The o b wire can have many configurations.
The red wire or 24 vac power lead is connected straight to the rc. This wire will go to the g terminal on your new thermostat. That is a basic honeywell thermostat wiring diagram for a single stage heat pump.
If you do have two transformers then your old thermostat had a red wire on the rc terminal.
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