I have an old Honeywell thermostat (model T874C1000) and want to install a new Honeywell RTH7000. The old one had 2 mercury switches for the heat and one merc switch for the a/c. As the outside compressor indicates Heat Pump, I'm assuming I have a 2-stage heat pump system.
The wiring connections on the old t-stat is as follows:
W1
Y1 (W1 is wire connected to W1)
W2
G
R
B
There is NO "O" or "Y2" wire connection.

There are three installation connection configuration options listed in the installation guide that came with the new RTH7000 t-stat but none match my current conenction completely.
Is there anyone who may know how to connect this properly without blowing up my system (if that's even possible)?
Help... please :)
--John

See how the thermostat wire are connected at the air handler and I can tell you how the thermostat wires should be connected