SM421 Operation Handbook15PART II Power supply and ProcedurePreparing for ProductionAIR PRESSURESAFEGUARDOVERRIDEMAIN SWITCHSTOPRESETSELECTFEEDERCHANGESTARTREADYPART II. Power supply and Procedure Preparing for Production2. Check the air pressureThe Range of the rated pressure: 0.45~0.55MPa1. InspectionsPressure Increase (Clockwise)Pressure Decrease (Counterclockwise)3. Check the main switch is on- Check the room temperature before turning on the first machine(Recommended temperature: above 20℃)- If the temperature is below 20℃, ensure that the roomtemperature is 20℃. And then wait for 30 minutes beforeturning on the machine torevent the condensation of air.Caution