Hoshizaki KM-501MRH Instruction Manual page 22

3. Follow the instructions below to drain the potable water tank.
1) Turn off the power supply.
2) Move the control switch on the control box to the "OFF" position.
3) Remove the base cover.
4) Remove one end of the pump tubing and drain the water tank.
5) Replace the pump tubing and the base cover in their correct positions.
6) Remove all ice from the storage bin and clean the storage bin.
7) Replace the front panel in its correct position.
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