Hoshizaki KM-650MAH Removal and Replacement of Components, Service for Refrigerant Lines

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V. Removal and Replacement of Components

IMPORTANT

Ensure all components, fasteners and thumbscrews are securely in place after

the equipment is serviced.

IMPORTANT

1.The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts.

2.Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made.

3.Do not leave the system open for longer than 15 minutes when replacing or servicing parts.

A.Service for Refrigerant Lines

1. Refrigerant Recovery

The icemaker unit is provided with refrigerant access valves. Using proper refrigerant practices recover the refrigerant from the access valves and store it in an approved container. Do not discharge the refrigerant into the atmosphere.

2.Evacuation and Recharge (R-404A)

1)Attach service manifold hoses and a vacuum pump to the system. Be sure to connect charging hoses to both high and low-side access valves.

IMPORTANT

The vacuum level and vacuum pump may be the same as those for current refrigerants. However, the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils.

2)Turn on the vacuum pump. Never allow the oil in the vacuum pump to flow backward.

3)Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on pump capacity.

4)Close the low-side valve and high-side valve on the service manifold.

5)Disconnect the vacuum pump and attach a refrigerant service cylinder to the high-side line. Remember to loosen the connection and purge the air from the hose.

For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the charge label in the machine compartment. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.

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Contents KM-650MAH KM-650MWH KM-650MRH Hoshizaki AMERICA, INC Contents Page KM-650MAH air-cooled Specifications IcemakerWater Cooled Condenser KM-650MWH water-cooledKM-650MRH remote air-cooled URC-5F Condensing UnitModel URC-5F SpecificationsII. General Information Construction KM-650MWH water-cooled KM-650MRH remote air-cooled Sequence of Operation Cycle Steps Harvest Cycle Freeze Cycle One Minute Control Board Control Products E Control Board Control Board LayoutControl Board Maximum Water Supply Period 6 minutes FeaturesLED Lights and Audible Alarm Safeties Default Dip Switch Settings Controls and AdjustmentsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Replacement Control Board Check ProcedureKM-650MAH air-cooled KM-650MWH water-cooled KM-650MRH remote air-cooled KM-650MAH air-cooled and KM-650MWH water-cooled Wiring DiagramsPsig 108 Performance Data680 615 IV. Service Diagnosis Minute KM Diagnostic Procedure No Ice Production Diagnostic ChartsProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Low Ice Production Abnormal IceOther Problem Possible Cause Remedy Evacuation and Recharge R-404A Removal and Replacement of ComponentsService for Refrigerant Lines Refrigerant RecoveryBrazing Removal and Replacement of CompressorRemoval and Replacement of Drier Removal and Replacement of Expansion Valve Removal and Replacement of Hot Gas Valve and Line Valve Removal and Replacement of Evaporator Adjustment of Water Regulating Valve Water-Cooled Model Only Page Removal and Replacement of Fan Motor Removal and Replacement of ThermistorRemoval and Replacement of Pump Motor Removal and Replacement of Inlet Water ValveRemoval and Replacement of Spray Tubes Cleaning and Sanitizing Procedures VI. Cleaning and Maintenance InstructionsCleaning Procedure Maintenance Sanitizing Procedure Following Cleaning ProcedureStainless Steel Exterior Condenser air-cooled and remote air-cooled models only Preparing the Icemaker for Long StorageStorage Bin and Scoop Air Filters air-cooled models onlyDrain the potable water tank Drain the potable water supply line
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