Hoshizaki C-101BAH Service Manual page 23

6) A liquid charge is required when charging an R-134a system. 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) Close the high-side valve on the gauge manifold, then close the refrigerant access valve
(if applicable). Disconnect the gauge manifold hose.
9) Cap the refrigerant access valve to prevent a possible leak.
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