Hoshizaki KML-451MWH Instruction Manual page 16

3. Drain the potable water tank:
1) Turn off the power supply.
2) Remove the front panel.
3) Move the control switch to "SERVICE" and move the service switch to the "DRAIN"
position.
4) Replace the front panel and turn on the power supply for 2 minutes.
5) Turn off the power supply.
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