A. Conform To Standards: All assemblies shall conform to listed standards and be acceptable to the Superintendent of Public Works having jurisdiction over the selection and installation of backflow prevention assemblies.
B. Testing: The premises owner or responsible person shall have the backflow prevention assembly tested by a certified backflow tester at the time of installation, repair or relocation and at least on an annual schedule thereafter or more often when required by the Superintendent of Public Works.
C. Access And Clearance: Access and clearance shall be provided for the required testing, maintenance and repair. Access and clearance shall require a minimum of one foot (1') (305 mm) between the lowest portion of the assembly and grade, floor or platform. Installations elevated more than five feet (5') (1.52 m) above the floor or grade shall be provided with a permanent platform capable of supporting a tester or maintenance person. (See Appendix A at Section 8-3-8 of this Chapter.)
D. Direct Connections: Direct connections between potable water piping and sewer connected wastes shall not exist under any condition with or without backflow protection. Where potable water is discharged to the drainage system, it shall be by means of an approved air gap of two (2) pipe diameters of the supply inlet, but in no case shall the gap be less than one inch (1") (25 mm). Connection may be made to the inlet side of a trap; provided, that an approved atmospheric vacuum breaker is installed not less than six inches (6") (152.4 mm) above the flood level rim of such trapped fixture, so that at no time will any such device be subjected to any back pressure.
E. Hot Water: Backflow preventers for hot water over one hundred ten degrees Fahrenheit (110°F) (43.3 degrees C) shall be a listed type designated to operate at temperatures of one hundred ten degrees Fahrenheit (110°F) (43.3 degrees C) or more without rendering any portion of the assembly inoperative.
F. Integrated Preventers: Fixtures, appliances or appurtenances with integral backflow preventers or integral air gaps manufactured as a unit shall be installed in accordance with their listing requirements.
G. Cold Climates: In cold climate areas, backflow assemblies and devices shall be protected from freezing by a method acceptable to the Superintendent of Public Works. (Ord. 938, 6-3-1991; amd. 1998 Code)