As you can see from the fridge panel floor plan diagram, the Thermostat switch is provided to control the temperature inside the refrigerator. The temperature inside the refrigerator can be adjusted using the temperature control screw. Before we understand the floor plan diagram, understand that Freezers and refrigerators both use series circuits. The elements in this circuit are the compressor and the temperature control switch. The fridge panel floor plan diagram will help you understand how cold storage is designed. It should be noted here that large chambers allow easier control of temperature and relative humidity and better storage space use. Only in very particular situations should the cold store be designed with more than five or six cold chambers.