13 02/18 START UP PROCEDURE: Start up procedure shall conform to generally accepted practices and be done in a workman-like manner. The water can be introduced from the lines in the service directly through valved connections, or by temporary connections to taps made in the new line. If possible, all such connections should be made at the lowest point in the line to avoid air entrapment. All valves and other control points in the line that are open as the line filling begins should be closed gradually to avoid the possibility of water hammer. MANUFACTURERS WRITTEN CERTIFICATION: After testing and prior to start- up of the system, the manufacturer must certify in writing that the system was installed per the manufacturers installation instructions.