I currently have a Goodman system with emergency heat. The system is about 12 years old. The thermostat I currently have on it is a "LUX" PSMH45 LHP750 Mercury type. The way it is hooked up to the "LUX" is as follows: (This works Good I want to change to digital)

E - Brown
G - Green
Y - Yellow
R- Red
X - Blue
O - Orange
2 - White
B - Black

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I want to install a Honeywell RTH3100C which I purchased. Below I have listed the terminal lugs can you please indicate which color wire to place on the lugs?

E -
AUX -
Y -
G -
O -
L -
R -
B -
C - (This indicates is optional with batteries) What does that mean?

Thank you fro your assistance

Mike

Sorry your instruction manual was missing from your thermostat box. Below I have included a electronic version for you. Follow the directions exactly and you should have no problems.

http://customer.honeywell.com/techlit/pdf/PackedLit/69-1889EF.pdf