Manitowoc Ice CM MODEL STH003 - Manual (Page 79)

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9. Charge the system with the proper refrigerant to
the nameplate charge.
10. Operate the ice machine for one hour. Then,
check the pressure drop across the suction line
filter-drier.
a) If the pressure drop is less than 2 psig, the
filter-drier should be adequate for complete
cleanup.
b) If the pressure drop exceeds 2 psig, change
the suction line filter-drier and the liquid line
drier. Repeat until the pressure drop is
acceptable.
11. Operate the ice machine for 48-72 hours. Replace
the suction line and liquid line drier if necessary.
12. Follow normal evacuation procedures.