Hoshizaki KM-650MWH, KM-650MAH, KM-650MRH service manual Diagnostic Charts, No Ice Production

Page 32

freeze with the float switch removed, replace the board.

Note: Normal freeze cycle will last 20 to 40 minutes depending on model and conditions. Cycle times and pressures should follow performance data provided in this manual.

6)Pump-Out Cycle (10/20 second pump out) – the compressor remains energized, the hot gas valve energizes, the fan motor de-energizes, the pump motor stops for

2 seconds and starts in reverse rotation for 10/20 seconds. (This removes contaminants from the water reservoir through the check valve (drain valve) and down the drain and allows for a power flush of the float switch.) Check for clear tubing at the check valve housing and check the unit drain for water flow. Diagnosis: If the pump motor does not reverse, check the circuit and capacitor. If water does not pump out, remove the check valve (drain valve) housing and check/clean the valve assembly.

7)Normal Harvest Cycle – same as the initial harvest cycle – Return to step 4.

Note: Unit continues to cycle until bin control is satisfied or power is switched OFF. (The pump out cycle can be adjusted to occur every cycle, or every 2, 5, or 10 cycles. The factory default is every 10 cycles.) The unit always restarts at the 1 minute fill cycle.

B. Diagnostic Charts

1. No Ice Production

Problem

Possible Cause

 

Remedy

 

 

 

 

[1] The icemaker will not

a)Power Supply

1. OFF position.

1. Move to ON position.

start.

 

 

 

 

2. Loose connection.

2. Tighten.

 

 

 

 

 

 

 

 

3. Bad contacts.

3. Check for continuity and

 

 

 

replace.

 

 

 

 

 

 

4. Voltage too high or too

4. Check and get

 

 

low.

recommended voltage.

 

 

 

 

 

b)Fuse (Inside fused

1. Blown.

1. Check for short circuit and

 

disconnect, if any)

 

replace.

 

 

 

 

 

c) Control Switch

1. OFF position.

1. Move to ICE position.

 

 

 

 

 

 

2. Bad contacts.

2. Check for continuity and

 

 

 

replace.

 

 

 

 

 

d)Bin Control Thermostat

1. Tripped with bin filled

1. Remove ice.

 

 

with ice.

 

 

 

 

 

 

 

2. Ambient temperature

2. Increase ambient

 

 

too cool.

temperature.

 

 

 

 

 

 

3. Set too warm.

3. See "II.C.3. Controls

 

 

 

and Adjustments, g) Bin

 

 

 

Control."

 

 

 

 

 

 

4. Bulb out of position.

4. Place in position.

 

 

 

 

 

 

5. Bad contacts.

5. Check for continuity and

 

 

 

replace.

 

 

 

 

 

e)High Pressure Control

1. Bad contacts.

1. Check for continuity and

 

 

 

replace.

 

 

 

 

 

 

2. Dirty air filter or

2. Clean.

 

 

condenser.

 

 

 

 

 

32

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Contents KM-650MAH KM-650MWH KM-650MRH Hoshizaki AMERICA, INC Contents Page Specifications Icemaker KM-650MAH air-cooledKM-650MWH water-cooled Water Cooled CondenserKM-650MRH remote air-cooled Condensing Unit URC-5FSpecifications Model URC-5FII. 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 Control Products E Control BoardControl Board Layout Features Maximum Water Supply Period 6 minutesLED Lights and Audible Alarm Safeties Controls and Adjustments Default Dip Switch SettingsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Check Procedure Control Board ReplacementKM-650MAH air-cooled KM-650MWH water-cooled KM-650MRH remote air-cooled Wiring Diagrams KM-650MAH air-cooled and KM-650MWH water-cooledPsig Performance Data 108680 615 IV. Service Diagnosis Minute KM Diagnostic Procedure Diagnostic Charts No Ice ProductionProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Other Low Ice ProductionAbnormal Ice Problem Possible Cause Remedy Removal and Replacement of Components Service for Refrigerant LinesRefrigerant Recovery Evacuation and Recharge R-404ARemoval and Replacement of Compressor BrazingRemoval 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 Thermistor Removal and Replacement of Fan MotorRemoval and Replacement of Inlet Water Valve Removal and Replacement of Pump MotorRemoval and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Cleaning and Sanitizing ProceduresCleaning Procedure Stainless Steel Exterior MaintenanceSanitizing Procedure Following Cleaning Procedure Preparing the Icemaker for Long Storage Storage Bin and ScoopAir Filters air-cooled models only Condenser air-cooled and remote air-cooled models onlyDrain the potable water supply line Drain the potable water tank
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