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5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air from
the hose. See the nameplate for the required refrigerant charge. Hoshizaki recommends
only virgin refrigerant or reclaimed refrigerant which meets the requirements of ARI
Standard 700 (latest edition) be used.
6) A liquid charge is recommended 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 access valve to prevent a possible leak.
B. Important Notes for Component Replacement
NOTICE
When replacing a component listed below, see the notes to help ensure proper
operation.
Component Notes
Compressor
Install a new drier and PTC relay.
Evaporator Assembly Components. See Fig. 9.
Upper and Lower
Bearings
Inspect the upper bearing for wear. See "V.C.1. Upper Bearing Wear Check." Replace
if necessary. When replacing the upper bearing it is advised to also change the lower
bearing at the same time.
Evaporator
• Install a new drier.
• Inspect the mechanical seal and O-ring prior to installing the new evaporator. If worn,
cracked, or scratched, the mechanical seal should also be replaced.
Gear Motor Install a new gear motor capacitor.