Section 826. Service of summons

(a)  Unless the court issues a warrant
  pursuant to section eight hundred twenty-seven of this part, service  of
  a  summons and petition shall be made by delivery of a true copy thereof
  to the person summoned at least twenty-four hours before the time stated
  therein for appearance. If so requested by  the  respondent,  the  court
  shall not proceed with the hearing or proceeding earlier than three days
  after such service.
    (b)  If  after  reasonable  effort,  personal service is not made, the
  court may at any stage in the proceedings make an  order  providing  for
  substituted  service  in  the manner provided for substituted service in
  civil process in courts of record.