I'm sorry, the new unit is a Hunter 42995b. I know that it is the wrong one. It's not made for heat pumps which is what my Trane XE1100 is.

I am also sorry I did not mention that I am the mom of a helpful but impetuous 20 yr. old (that thinks he knows everything). I know nothing about a/c or heating or really anything electrical, I didn't even know he was going to do this until I got home and he was in a panick because he had tried to connect the digital unit and it wouldn't work, then he thought he'd just put the old one back on and none the wiser. Ahhh, but one problem, in his haste to complete this project for his mother, he did not tag the wires or map out the old wiring positions before removing the old unit. Thus the situation we are in today.

I appreciate your response, but That schematic looks like Chinese to me. I need to know what color wire goes on what letter terminal. Can you still help me?

Thanks again,
Sunny

We live in Florida and I can not ell you what a wonderful evening it was last night with no a/c. Needless to say I haven't slept yet.

What colors do you have? And what is the model and brand of the thermostat he is going to reinstall?