The INV Series is equipped with an Engine Smart Control (ESC) mode which can be turned on or off using the ESC switch. When the engine smart control switch is in the on position “I” the engine speed will vary speed to match the required power output to conserve fuel, and reduce wear and noise. If loads requiring intermittent power, or multiple large loads are connected, turn the electronic speed control switch off “O” to avoid extended warm up time, keep the electronic speed control off keep the electronic speed control off until normal operating temperatures have been reached.