said second timer being adapted to respond to the establishment of {HEAD ~ the commencement} of {TAIL ~ each system} on time to establish a period during which said pump is energized; and 
of
said second timer being adapted to respond to the establishment of { HEAD ~ the commencement } of { TAIL ~ each system } on time to establish a period during which said pump is energized ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH