I am replacing an old mercury thermostat with a honeywell rth7000. I have a heat pump
Unit.

Current Mercury wired as such:
Red wire to R
Brown wire to T
Orange wire to O
Green wire to G
Yellow wire to Y
Blue wire to B
White wire to w with a cooper plate connected for w to u

Honeywell RTH 7000 labeled for heat pump as such:

C AUX
G E
Y L
O/B
RC
R

What wire do I connect from my old mercury to my new Honeywell rth 7000


Thanks,

Craig

Red to R & Rc, white to AUX, yellow to Y, green to G, orange to O, blue to C, insulate brown (not used). Check installation instructions for configuration options to assure O/B is energized in cooling mode.