Ⅰ. Summary: water filter circuit board
 1.Application scope：≦400G water purifier
 2.Operating temperature：-20°C - +70°C
 3.Operating Humidity：5%-85%
Ⅱ. Performance Indicators:
 Power supply：DC24V
 Load current：3A
 Controls Power Consumption：＜ 5W
 Screen size:‘8’Nixie tube
 Mounting holes size：120/110*50mm
 PCB size：130*60mm
Ⅲ. Specific Function:
Ⅰ. Power :
 The computer board energized after 2 seconds to enter the operating  state. Buzzer chirping and machine automatically wash for 18s. The change of‘8’indicate the respective operating state.
Ⅱ. Wash:  s=seconds
（1） Boot automatically washing for 18s
（2）Press the "Strong Wash Button" to automatically washing for 18s.
（3）Automatically washing for 18S every 6 hours.
（4）Automatically washing for 18S when water lack turns to source
Ⅲ. Purify:
 When the switch detected a pressure lower than normal high pressure,the booster pump started to work,inlet valve opened and entered the purify process.
Ⅳ. Full:
 When the pressure reached a certain degree in pressure bucket,high-voltage switch turned off, the machines shut down,inlet valve closed.
Ⅴ. Lack:
When the low pressure switch detected the water pressure below the set value or the computer board detected low pressure switch off,the machines shut down,booster pump stopped,inlet valve closed, buzzer chirping for 10 seconds.
Ⅵ. Check:
  Continuously produced water for 6 hours(no water full), it means something wrong happened to the machine and entered the check process, buzzer chirping for 10 seconds.