Saving Energy without Doing Anything 4 kinds of sensors detect conditions of use to automatically optimize energy saving. ECONAVI analyzes and responds to this information to maintain ideal cooling and avoid wasting energy. 1 Panasonic in-house data. Using NR-BE647 with a temperature setting of the refrigerator is “MED”. Ambient temperature: 30ºC. Door opening/closing frequency: fridge compartment 39 times/day, freezer compartment 8 times/day. Load: 1000 g test package in the freezer compartment, 2.5 L of water in the fridge compartment. If there is a power outage, ECONAVI functions may not operate normally. ECONAVI operates only when the temperature setting is [MED] for both the freezer and fridge compartments.