White roger thermostats? im replace old white roger murcury to a investigational white roger porgam...

im replace old white roger murcury to a investigational white roger porgam i have bolie y ,r g lead lost in mich bound wire is on rc rh
Answers:    If you enjoy electric heat you hold to move the yellow flex but if you have gas you dont obligation to. Moving that wire make the fan come on right away for electric steam. Te thermostat is already set up for gas heat.no obligation to make change unless you have 2 transformers which I doubt you own. You didn't give out satisfactory info. I am just guessing.
You are to remove the red pullover (RC-RH) if your HVAC system has TWO transformers.