Pressure switch 4 terminals, 1,3 connected to the power supply is directly connected to 220? 2, then the suction pump, but the pump on a power plug, I would like to ask where?
2, the pump power cord is disconnected, close to the pump power plug of the end of the pressure switch connected to the 1,3 terminal, from the 2,4 cable back to the pump the other end of the power cord.
1, with a plug with a wire, plug into the socket A, the wire connected to the pressure switch 1,3 terminal. From the 2, 4 terminal leads to a socket B, the pump power plug is plugged into socket B.
See you intend to put the pressure switch connected to the socket or in the middle of the pump line.
