Have you wanted to be able to just flip a switch to either AUTOMATIC mode or MANUAL mode? Maybe on very cold days you would like a switch at your backdoor that you could set to STAY CLOSED? Later you may want to set the switch back to AUTOMATIC.
Here is a diagram that shows how to do it. If you just want to always manually operate the door remotely, you only need to wire up a two position MANUAL SWITCH as shown in this diagram. But if you want to select AUTOMATIC with the switch then you need to wire up a three position switch as shown in this diagram.