Great to hear Mopar Guy. I do allot of design work with Lennox Technical Support so I asked them to send me the wiring diagram for my system using the Signature Stat and it showed this jumper in a dual fuel applicaiton so I was surprised to hear you didn't need it. I'm glad to hear your now happy with your system.
I got my new A-Frame coil installed and have the stat wired according to the diagram I described above. I am very happy with the way the system operates. My only complaint is the pinging noise that seems to come from the line sets. I'm not sure if this is something I am going to have to get used to or not??