107. InstallationSecuring to the wallIllustrationCheck4. Drill holes for the remaining four screws.5. Hang the unit again by the ¿rst screw, and theninsert and tighten the remaining four screws.6. Take waterproo¿ng measures so that water doesnot enter the building from screws mounting thedevice.• Make sure the unit is installed securely so that it willnot fall or move due to vibrations or earthquakes.1. Drill a single screw hole, making sure to hit a stud.2. Insert and tighten the screw and hang the unit bythe upper wall mounting bracket.3. Determine the positions for the remaining four screws(two for the top bracket and two for the bottom), andremove the unit.• The weight of the device will be applied to the wall. If the strength of the wall is notsuf¿cient, reinforcement must be done to prevent the transfer of vibration.• Do not drop or apply unnecessary force to the device when installing. Internal parts maybe damaged and may become highly dangerous.• Install the unit on a vertical wall and ensure that it is level.Locating Screw HolesMountingStructure• When installing with bare hands, take caution tonot inÀict injury.• Be careful not to hit electrical wiring, gas, or waterpiping while drilling holes.ItemCAUTIONBe sure to doMounting Bracket(upper)Location of Screw HoleLocating Screw HolesInstallations at ElevationsAbove 2,000 ft.• Adjust the dip switches as illustrated in the table tothe right if this water heater is installed at an altitudeof 2000 ft. (610m) or higher.• Disconnect power to the water heater beforechanging the dip switches. Failure to perform thisstep will result in a "73" code displayed on the remotecontroller and a cease in operation. If this occurs,disconnect, then reconnect power to the water heaterto reset the system.Note : Please refer to page 29 for the location of thedip switch bank.Tapping Screw* Do not change any other dipswitches.* High elevation adjustment.652,001 - 4,000 ft (611 - 1,220m)0 - 2,000 ft (0 - 610m)ON= OFF=4,001 - 6,000 ft (1,221 - 1,830m)6,001 - 8,000 ft (1,831 - 2,440m)