Its a TH3210D1004
Yes, It plugs into the outside unit.
Yes, It is a self contained packaged heatpump. I can run up the road and get the model number. I have the manual with me. Its a Q7RD / PPH3rd Series
Excellent .You will want to wire as follows:
R from outdoor to R on thermostat (24v power)
E from outdoor to E on thermostat (Heat strips for emergency heat)
W2 from outdoor to AUX on thermostat(Heat strips for backup heat)
O from outdoor to O at thermostat(Reversing valve)
Y from outdoor to Y at thermostat(AC contactor)
C from outdoor to C at thermostat (24v Common)
Green wire from outdoor to G at thermostat (Blower motor)
Thanks - Hopefully that will take care of it. I appreciate your help.