The Culligan N8 Custom and Estate 2 water softener systems are basically the same system. Here are a couple links for N8 manual to reset timer and Est 2 manual for other settings on systems that have "DIP" switches to set gallons settings.

http://www.culliganprowater.com/timer-reset.aspx

http://www.culliganwater.com/residential/resources/pdfs/reference/household_and_commercial_circuit_boards.pdf

RJ