Using PC chip control electronic pressure switch, avoid frequent take off pressure switch, long service life. When the pump is not used for a long time, every 72h it will start for 10s in order to avoid the lock of the machine. When no inlet water, the water pump continuously detecting 8 minutes, automatically enter the water protection system. To avoid the pump in the anhydrous state-run for a long time. Increase the startup delay function when the electric pump inserted into the socket, delay 3s start, avoid spark-over socket, protect personal safety. The flow priority
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