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Automatic transfer switches must also be operated monthly. The monthly test. consists of electrically operating the transfer switch from the standard position to. the alternate position and then a return to the standard position.
How it's done: 1  The ambient temperature sensor switch is verified to see if it needs to be replaced. 2  The defective ambient temperature sensor switch is removed. 3  The new ambient temperature sensor switch is installed.  The ambient temperature sensor switch is tested for operation.