8. Power Connection
a. Power supply is low voltage DC (12V), the interface is socket type at the top.
b. Control element: three low voltage reversing electrically operated valves.
c. Connection principle:
1. SW and OPEN short sub, electrically operated valve open, after putting in place and maintain.
2. SW and CLOSE short sub, electrically operated valve close, after putting in place and maintain.
9. Working Process
1. Filtration:
Under the action of water pressure, raw water through DD1 and enters into UF filters; DD2 is closed
at the moment. DD3 opens, filtered water comes out.
2. Flushing:
a) DD1 opens, DD2, DD3 are closed, pressure tank starts to store water (20 seconds).
b) After water storing finished, DD1, DD3 are closed, DD2 opens, water stored in the pressure tank
starts to back wash UF filters, the flushing water comes out from the discharge outlet (20 seconds).
c) After back washing finished, DD1 opens, raw water forward washes UF filters and comes out from
the discharge outlet (20 seconds).
