CNBTR  1/2" AC110V Multifunction Automatic Electronic Timed Air Compressed Drain Valve The Timer Drain Valve is Used to drain water from your air tank and any other application where you want a timed operation controling fluid to an open end. Removable filter for easy cleaning. Emission time and interval time are controlable . Not only does this valve seal more reliably and easily than the cheap twist type valves Note: there is no cord in the package. Press the off for 3 second,the last set time SEC ON (MIN OFF) is displayed and flashes, then release, press ON button, the time will be reduced by one unit,press OFF button, the time will be added by one unit. After setting the time ON(OFF) you needed, press the TEST/ENTER, the data will be stored and the system exits the setting status.After the setting is completed, the system will return to the original working state. The new setting time will play a role in the next cycle. Time inquiry and manual test. The electronic drain valve operates normally,but there is no water discharged. It is likely that the filter is blocked.At this time, the filter should be cleaned. The solenoid valve can not be closed (leakage) if the component is not damaged,The reason may be that a large amount of powder in the condensate enters the filter and enters the gap between the valve plug and the sheath,lead to stuck the valve. At this time, the valve core need to clean up. Cleaning valve core Close the isolation valve and press the TEST key to empty the compressed air to ensure that the drain valve is isolated from the air pressure system (zero pressure). Cut off the drain valve power supply. Take off the coil(The electronic drain valve must be de-energized before taking off the coil, otherwise the energized coil is burned out of the valve stem), unscrew the hex nut, take off the valve plug and the spring, clean the seat, valve core and Spring and valve plug jacket, then re-install them.