I have a Trane Heat pump AC/Heat. There are several wires and Im a little stumped? There is a Tan wire*which the book does not show) and a black wire that is labled X1 on the old one but is not in the new ones book? I have also been told NOT TO hook blue wire up to the B port?? But if not, not sure where to put it?
The tan wire isn't used on digital stats you should tape it up. The black wire which should actually be X2 should be emergency heat. And you are correct do not hook up the blue wire to B, you will blow the low voltage fuse or transformer. If the Hunter stat has a C or 24 volt common terminal you can hook the blue wire up there and you won't go through as many batteries. All the rest of the wires should hook up color for letter. GL.
Tell us the wires that you have coming out of the wall and what they hooked to on your old thermostat (red wire from wall to R on old tstat). Also we need to know what type of hunter thermostat you have. With this info someone on here, me included, can get you hooked up for free. Good luck...
Generally the blue wire is never used in a 4 wire system. There also is no guarantee that the other wires are correct. Making note before you swapped wires sure would have helped. A little late now. This the normal wiring designation. white= common =goes to C green= fan=goes to G red=heat=goes to R blue I suspect should be yellow which goes to Y and is for cooling. Just attach the blue to Y Your new thermostat should tell you if the jumper is needed. Most come with the jumper already installed. Don't forget to read the section on setting the Heat Anticapater. Electric heat is normally set at .7. Gas would be different.
Go get an HVAC technician to install it. You'll have at lot less headaches
