Hoshizaki KML "F" SERIES, KML "H" SERIES service manual Evaporator is Frozen UP, LOW ICE Production

Page 87

2. EVAPORATOR IS FROZEN UP

PROBLEM

POSSIBLE CAUSE

 

REMEDY

[1] Freeze cycle

a) Float Switch

1.

Leads short-circuit or

1.

Check and replace.

time is too

 

 

defective switch.

 

 

long.

 

2.

Float does not move freely.

2.

Clean or replace.

 

 

b) Water Solenoid

1.

Diaphragm does not close.

1.

Check for water leaks

 

 

Valve

 

 

 

with icemaker off.

 

 

c) Controller Board

1. Defective.

1.

See “II.2[e] CHECKING

 

 

 

 

 

 

CONTROLLER BOARD.”

[2] All ice formed

a) Evaporator

1.

Scaled up.

1.

Clean.

on Evaporator

b) Water Supply Line

1.

Water pressure too low.

1.

Check and get

does not fall

 

 

 

 

recommended pressure.

into bin in

c) Water Solenoid

1.

Dirty mesh filter or orifice.

1.

Clean.

harvest cycle.

Valve

2.

Diaphragm does not close.

2.

Check for water leaks

 

 

 

 

 

 

with icemaker off.

 

 

d) Ambient and/or

1.

Too cool.

1. Increase temperature.

 

 

water temperature

 

 

 

 

 

 

e) Thermistor

1.

Out of position or loose

1.

See “V. 11. REMOVAL

 

 

 

 

attachment.

 

AND REPLACEMENT OF

 

 

 

 

 

 

THERMISTOR.”

 

 

f) Controller Board

1.

Defrost Timer is set too

1.

Adjust longer, referring

 

 

 

 

short.

 

to “II. 2. [d] CONTROLS

 

 

 

 

 

 

AND ADJUSTMENT, 2)

 

 

 

 

 

 

Defrost Timer.”

 

 

 

2. Defective.

2.

See “II. 2.[e] CHECKING

 

 

 

 

 

 

CONTROLLER BOARD.”

[3] Others

a) Spray Tube

1. Clogged.

1. Clean.

 

 

 

2.

Out of position.

2.

Place in position.

 

 

b) Water System

1.

Dirty.

1.

Clean.

 

 

c) Refrigerant

1. Undercharged.

1.

Check for leaks and

 

 

 

 

 

 

recharge.

 

 

d) Expansion Valve

1.

Bulb out of position or

1.

Place in position.

 

 

 

 

loose attachment.

 

 

 

 

 

2. Defective.

2.

Replace.

 

 

e) Hot Gas Solenoid

1. Coil winding opened.

1. Replace.

 

 

Valve

2.

Plunger does not move.

2. Replace.

 

 

 

3.

Wiring to Hot Gas Valve.

3.

Check for loose

 

 

 

 

 

 

connection or open, and

 

 

 

 

 

 

replace.

 

 

 

 

 

 

 

3. LOW ICE PRODUCTION

PROBLEM

POSSIBLE CAUSE

REMEDY

[1]

Freeze cycle

a) See chart 1 - [3], and check dirty Air Filter or Condenser, ambient or water

 

time is long.

temperature, water pressure, Water Regulator or refrigerant charge.

 

 

b) See chart 2 - [1], and check Float Switch, Water Solenoid Valve or Controller

 

 

Board.

 

[2]

Harvest cycle

a) See chart 2 - [2], and check Controller Board, Thermistor, Evaporator, ambient

 

time is long

and/or water temperature, water supply line, Water Solenoid Valve.

 

 

 

 

87

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Contents KML F Series KML H Series Hoshizaki AMERICA, INC Contents Wiring Diagrams Removal and Replacement of FAN Motor KML-250MAH SpecificationsKML-250MWH KML-350MAF KML-350MWF KML-350MAH KML-350MWH Beginning serial #L00001J, ending Serial #M20060C KML-350MWH Beginning serial #M30061E KML-450MAF KML-450MWF KML-450MAH KML-450MWH Beginning Serial #L00001D, ending Serial #M10530B KML-450MWH Beginning Serial #M20531D KML-600MAF KML-600MWF KML-600MRF KML-600MAH KML-600MWH Beginning Serial #L00001D, ending Serial #M10115C KML-600MWH Beginning Serial # M10121E KML-600MRH Condenser Unit URC-7F Specifications URC-7F KML-250MAH, KML-350MAF, KML-350MAH, KML-450MAF, KML-450MAH II. General Information ConstructionKML-250MWH, KML-350MWF, KML-350MWH, KML-450MWF, KML-450MWH KML-600MAF, KML-600MAH KML-600MWF, KML-600MWH KML-600MRF, KML-600MRH For machines with thermostat, there is no connection on K4 Controller BoardSOLID-STATE Control Controller BoardPage Freeze Cycle Beep every 3 sec. = High Evaporator Temperature 127 FMinute Fill Cycle Harvest CycleControl Products HOS-001A Board Important Water Valve opening is limited to 6 minutes Sequence 1st Cycle2nd Cycle and after with pump drain 2nd Cycle and after with no pump drain Controls and Adjustments For Models with ThermostatFor Models with Mechanical BIN Control Page Setting Time Models with Thermostat Checking the Controller Board Models with Mechanical BIN ControlSwitches Control SwitchService Switch Explanation of Operation Proximity SwitchMechanical BIN Control These Instructions not Applicable to Models with ThermostatTroubleshooting Mechanical BIN Control only Water Circuit and Refrigerant Circuit III. Technical InformationPage KML-600MRF, KML-600MRH Wiring Diagrams KML-250MWH Pressure Switch KML-350MWF KML-350MAFKML-350MWH Beginning Serial #M40081G Beginning Serial #M20291G KML-350MAHKML-450MAF and KML-450MWF KML-450MWH Pressure Switch KML-450MWH Beginning Serial #M30711G Beginning Serial #M22771G 600MRF KML-600MAFKML-600MWF KMLPage Page Beginning Serial #M20331E Beginning Serial #M20141F KML-600MRHControls and Adjustments Timing ChartWash Performance Data KML-250MWH KML-350MAF KML-350MWF KML-350MAH KML-350MWH Serial #L00001J through M20060C KML-350MWH Beginning Serial #M30061E KML-450MAF KML-450MWF KML-450MAH KML-450MWH Serial #L00001D through M10530B KML-450MWH Beginning Serial #M20531D KML-600MAF KML-600MWF KML-600MRF KML-600MAH KML-600MWH Serial #L00001D through Serial #M10115C KML-600MWH Beginning Serial #M10121E KML-600MRH Problem Possible Cause Remedy IV. Service Diagnosis 1. no ICE ProductionController Board Clean LOW ICE Production Evaporator is Frozen UPOthers Abnormal ICEEvacuation and Recharge R-404A Removal and Replacement of ComponentsService for Refrigerant Lines Refrigerant RecoveryBrazing Removal and Replacement of Compressor Important Removal and Replacement of Drier Removal and Replacement of Expansion Valve Removal and Replacement of HOT GAS Valve and Line Valve Page Removal and Replacement of Evaporator Important Page Adjustment of Water Regulating Valve WATER-COOLED Model only Page Removal and Replacement of Thermistor Caution Removal and Replacement of FAN Motor Removal and Replacement of Water Valve Removal and Replacement of Spray Tubes Removal and Replacement of Pump MotorPreparing the Icemaker for Long Storage VI. Maintenance and Cleaning InstructionsPage Cleaning Procedure Page Sanitizing Procedure Following Cleaning Procedure Maintenance

KML "F" SERIES, KML "H" SERIES specifications

The Hoshizaki KML "H" Series and KML "F" Series are state-of-the-art commercial ice machines designed to meet the diverse needs of the foodservice industry. Renowned for their reliability, efficiency, and innovative technology, these ice machines are perfect for restaurants, bars, and hotels seeking high-quality ice production.

The KML "H" Series focuses on producing crescent cubed ice, a preferred choice for many establishments due to its slow melting rate and ability to chill beverages effectively. One of the main features of the "H" Series is the ice-making process, which utilizes advanced technology to ensure a quick production cycle. The machines come with a variety of capacities to suit different business sizes, ranging from small-scale operations to large commercial needs.

The KML "F" Series, on the other hand, is designed to produce flaky ice, which is ideal for display in seafood and salad bars. This series stands out with its unique ice texture, perfect for preserving freshness and enhancing presentation. The "F" Series also boasts high production rates, ensuring a continuous supply of ice even during peak hours.

Both series come equipped with Hoshizaki's exclusive Cascade Ice Making System, which enhances water flow and improves efficiency, leading to lower energy consumption. This is complemented by an exterior that is easy to clean and maintain, reducing labor costs associated with upkeep.

Key characteristics of the KML Series include durable stainless-steel construction, providing longevity and resistance to corrosion. Moreover, both series feature a self-diagnostic control system that alerts users to potential issues before they become significant problems, thereby minimizing downtime.

In addition to their robust design and performance, they also incorporate environmental considerations. Hoshizaki machines are engineered to operate using refrigerants that have a lower impact on the ozone layer, making them compliant with global environmental standards.

Overall, the Hoshizaki KML "H" Series and KML "F" Series stand out in the competitive landscape of commercial ice machines, combining innovative technology, exceptional durability, and user-friendly features to provide a reliable ice-making solution for various foodservice applications.
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