My furnace runs on and on d like a manual for thermostat that my son inlaw told me look up

This one (http://www.emersonclimate.com/Documents/White-Rodgers/instruction_sheets/0037-2196.pdf) might be close to your model.

Otherwise, you can look around here (http://www.emersonclimate.com/en-US/products/thermostats/dont_know_your_model_number/1e56-1f56/Pages/1e56-1f56.aspx) to try and find the info you want.

Good luck,
WallyH