Hoshizaki KM-1300MAF Instruction Manual page 23

[2] Remove the water from the potable water supply line:
1) Remove the Front Panel. (Except water-cooled model)
2) Move the Control Switch, on the Control Box, to the "OFF" position.
3) Wait 3 minutes.
4) Close the Potable Water Supply Line Shut-off Valve and open the Potable Water Supply
Line Drain Valve. See Fig. 10.
5) Allow the line to drain by gravity.
6) Attach compressed air or carbon dioxide supply to the Potable Water Line Drain Valve.
7) Move the Control Switch to the "ICE" position.
8) Quickly blow the potable water line out using compressed air or carbon dioxide.
[3] 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 Insulation Panel.
4) Remove the Rubber Cap covering the Overflow Pipe in the Water Tank. Remove the
Overflow Pipe by turning it counterclockwise. Drain the Water Tank. See Fig.11.
5) Replace the Overflow Pipe, the Rubber Cap and the Insulation Panel in their correct
position.
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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