A.O. Smith 110-310-510 – DRAINING THE UNIT:

1) Close the manual gas shut off valve.
2) Turn off power to the unit, and then turn on again.
3) Wait 30 seconds, and then turn off power to the unit, yet again.
4) Close the cold water inlet shutoff valve.
5) Open all hot water taps in the house, or open the pressure?relief valve to remove the initial
pressure. When the residual water flow has ceased, close all hot water taps.
6) Unscrew the drain plugs (hot water outlet drain plug and cold water inlet filter) to drain the
remaining water out of the unit. Have a bucket or pan to catch the water from the unit’s
drain plugs. Wait a few minutes to ensure all water has completely drained from unit.