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OK first of all the model is for the evaporator coil. Look for a number like RBEA on air handler. Now once inside you will find a brown wire from transformer.You will notice that it is connected to a wire which goes to outdoor unit.That is your C or 24 volt common where you want to connect the C wire from thermostat
Thanks.Let me grab a manual
Locate the transformer. You will see a 24volt hot red coming from transformer going to R at thermostat.Then you will see the 24v common which is brown going to outdoor unit,fan relay and ground. That brown is the 24v common so connect C from thermostat with the browns.
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