Service Manual

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4) Close the low-side valve and high-side valve on the gauge manifold.
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 rating label inside the icemaker for the required refrigerant charge.
Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI
Standard 700 (latest edition) be used.
6) A liquid charge is required for 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
access valve with the icemaker running.
9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold
hoses.
10) Cap the access valves 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, start capacitor, and start relay.
Expansion Valve •Installanewdrier.
•Attachtheexpansionvalvebulbtothesuctionlineinthesamelocationastheprevious
bulb.
•Thebulbshouldbebetweenthe10and2o'clockpositionsonthetube.
•Securethebulbwiththeclampandholder,theninsulateit.
Upper and
Lower Bearings
•Inspecttheupperbearingforwear.See"V.B.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.