It took me 3 hours to understand diagram, well almost.
1. Brown wire is electrical heat wire, right?
2. How can I find out which transformer terminal is common? Does blue wire go to "C" terminal of thermostat?
3. Can I use solder instead of brazing? I used it to replace filter on another AC and it works fine for about 1 year. I just didn't know about brazing back then.
4.I hope I don't need to replace wiring from my fuse box. New HP is 40 Amps, old one is 30. I did not check wires yet. Which gauge it should be for 40 Amps? 8?
5. Is 3 ton enough for 1500 sq.f house? North Florida. Lowest temperature is 25.