1、When the controller cartridge progress bar shows red, please replace the cartridge in time. 2、Open the middle gland plate of the exchange core in the direction as shown. 3、Take out the cartridge in the direction of the figure and replace it. 4、Put the replaced cartridge into the corresponding slot and cover the exchange core gland. 5、Open the cartridge setting page of the controller and press and hold the cartridge progress bar for 5 seconds to reset the cartridge balance, and the display shows 100% that the reset is successful. Note: Steps 1 and 5 are required for CLS4.0S LCD controller, if you purchase other controllers, please refer to the manual of the controller.

Energy saving mode: The air volume of exhaust air and fresh air are equal. Default wind speed is low speed. Haze removal mode: The fresh air is high speed, the exhaust air is low speed, and the wind speed shows high speed. Sleep mode: Both fresh air and exhaust air are low speed, wind speed shows low speed. Auto mode: Automatically adjust the airflow level according to the indoor CO2 and PM2.5 concentration. User can set the corresponding value in the setting page. For example, when PM2.5 is set to High > 100 > Medium > 35 > Low and C02 is set to High > 1500 > Medium > 700 > Low, when the air quality sensor detects PM2.4 > 100 and CO2 is between 700 and 1500, the wind speed is high.