Hoshizaki KM-420MWJ Service Manual page 68

6) A liquid charge is required when charging an R-404A system (to prevent fractionation).
Place the service cylinder on the scales; if the service cylinder is not equipped with
a dip tube, invert the service cylinder, then place it on the scales. Open the high-side
valve on the gauge manifold.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) If necessary, add any remaining charge to the system through the low-side.
NOTICE! To prevent compressor damage, use a throttling valve or liquid
dispensing device to add the remaining liquid charge through the low-side
refrigerant shutoff valve with the icemaker running.
9) Close the high and low-side refrigerant shutoff valves. Close the high and low-side
gauge manifold valves, then disconnect the gauge manifold hoses.
10) Cap the refrigerant shutoff valves to prevent a possible leak.
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