Scott,
Go into FieldPoint Explorer, right click on the FP-1000 and choose Edit This Device. Uncheck the box that says Factory Configuration. Your module will then power up using your settings rather than the factory defaults. Please note that your settings are still in the network module, just not being used. You will not have to reconfigure the FP-TC-120 after unchecking the box. Just cycle the power and the module will power up with the Temperature range rather than the voltage range selected.
Regards,
Aaron