Hoshizaki KML-351MAH Instruction Manual page 19

3. Drain the potable water tank:
1) Turn off the power supply.
) Remove the front panel.
3) Move the control switch to the "SERVICE" position and move the service switch to the
"DRAIN" position.
4) Replace the front panel and turn on the power supply for  minutes.
5) Turn off the power supply.
6) Close the potable water supply line drain valve.
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