complete
this circuit is for a asphalt tank to bypass the computer controls.
BYPS is a double pole single throw switch
AS1 is the computer that tells the valve to open and close and is also looking for the return signal for the open and close mechanical switch
R0,R1,R2,R3 are all ice cube relays
MSWT is being used as a mechanical switch on the valve the computer uses to see if the tanks are open or closed.