Hoshizaki HW-320B Service Manual page 15

4b2. Removal and Replacement of Internal Booster Tank
1) Turn off the power supply. Lockout/Tagout to prevent the power from being
turned back on inadvertently.
2) Close the water supply line shut-off valve.
3 )Remove the kickplate.
4 ) Drain the internal booster tank from the drain outlet (prepare a container)
To avoid possible burns, allow the internal booster tank water temperature
to fall below 40°C before draining.
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