Hoshizaki KM-650MRH, KM-650MAH, KM-650MWH service manual Low Ice Production, Abnormal Ice, Other

Page 37

Problem

Possible Cause

 

Remedy

 

 

 

 

[3]Other (continued)

g)Water Supply Line

1. Too small; requires

1. Increase water line size.

 

 

3/8" OD line dedicated

 

 

 

per machine.

 

 

 

 

 

 

h)Water Filter

1. Flow rate too small.

1. Replace with filter that has

 

 

 

larger flow rate.

 

 

 

 

3. Low Ice Production

 

 

 

 

 

 

Problem

Possible Cause

 

Remedy

 

 

 

 

[1]Freeze cycle time is

a) See chart 1.[3] and check dirty air filter or condenser, ambient or water

long.

temperature, water pressure, condenser water regulating valve (water-cooled

 

model), and refrigerant charge.

 

 

 

 

 

 

b) See chart 2.[1] and check float switch, inlet water valve and control board.

 

 

 

 

 

c) Check pump, hot gas valve, headmaster (C.P.R.) (remote air-cooled model),

 

expansion valve, refrigeration check valve, and compressor.

 

 

 

 

[2]Harvest cycle time is

a) See chart 2.[2] and check control board, thermistor, evaporator, ambient and/or

long.

water temperature, water supply line, inlet water valve, line valve, and gas valve.

 

 

 

 

4. Abnormal Ice

 

 

 

 

 

 

 

Problem

Possible Cause

 

Remedy

 

 

 

 

[1] Small cubes.

a) Ice Cube Guide

1. Out of position.

1. Place in position.

 

 

Circulated water falls

 

 

 

into bin.

 

 

 

 

 

 

b) See chart 1.[5] and check water supply line, inlet water valve, water system,

 

pump motor, and control board.

 

 

 

 

 

 

c) Pump Out Check Valve

1. Dirty.

1. Clean.

 

 

 

 

[2] Cloudy or irregular

a) See chart 2.[1] and 2.[3], and check float switch, inlet water valve, control

cubes.

board, spray tubes, water system, refrigerant charge, and expansion valve.

 

 

 

 

 

b) Spray Guide

1. Dirty.

1. Clean.

 

 

 

 

 

c) Water Quality

1. High hardness or

1. Install a water softener or

 

 

contains impurities.

filter.

 

 

 

 

5. Other

 

 

 

 

 

 

 

Problem

Possible Cause

 

Remedy

 

 

 

 

[1]Icemaker will not stop

a) Bin Control Thermostat

1. Set too cold.

1. Adjust warmer.

when bin is filled with

 

 

 

 

2. Defective.

2. Replace

ice.

 

 

 

 

 

 

 

 

[2] Abnormal noise.

a) Pump Motor

1. Bearings worn out.

1. Replace

 

 

 

 

 

b) Fan Motor

1. Bearings worn out.

1. Replace

 

 

 

 

 

 

2. Fan blade deformed.

2. Replace fan blade.

 

 

 

 

 

 

3. Fan blade does not

3. Replace.

 

 

move freely.

 

 

 

 

 

 

c) Compressor

1. Bearings worn out or

1. Replace.

 

 

cylinder valve broken.

 

 

 

 

 

37

Image 37
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 Board Layout Control Products E Control BoardControl 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 Abnormal Ice Low Ice ProductionOther Problem Possible Cause Remedy Service for Refrigerant Lines Removal and Replacement of ComponentsRefrigerant Recovery Evacuation and Recharge R-404ABrazing 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 Sanitizing Procedure Following Cleaning Procedure MaintenanceStainless Steel Exterior Storage Bin and Scoop Preparing the Icemaker for Long StorageAir Filters air-cooled models only Condenser air-cooled and remote air-cooled models onlyDrain the potable water tank Drain the potable water supply line
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