Hoshizaki MWH(-M), MWH KM-515MAH, MRH/3, MRH KM-901MAH Low Ice Production, Freeze-Up Possible Cause

Page 39

Freeze-Up - Possible Cause

11. Thermostatic Expansion Valve

a) Defective.

 

 

12. Hot Gas Valve

a) Closed or restricted.

13. Liquid Line Valve

a) Open.

 

 

 

Freeze Cycle

 

 

1. Evaporator

a) Scaled up.

 

 

 

b) Damaged.

2. Spray Tubes and/or Spray

a) Dirty.

Guides

b) Out of position.

 

 

 

3. Refrigerant Charge

a) Low.

 

 

4. Control Board

a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.

See "II.C. Control Board Check"

 

b) Defective.

5. Inlet Water Valve

a) Leaking by.

 

 

6. Float Switch

a) Float does not move freely.

See "II.E. Float Switch Check

 

b) Defective.

and Cleaning"

 

 

 

7. Pump Motor

a) RPM too slow.

 

 

 

b) Impeller damaged.

8. Thermostatic Expansion Valve

a) Bulb loose or defective.

 

 

9. Liquid Line Valve

a) Restricted.

 

 

10. Headmaster (C.P.R.)

a) Not bypassing.

(remote models)

 

 

 

3. Low Ice Production

Low Ice Production - Possible Cause

 

Long Harvest Cycle

 

 

1. Evaporator

a) Scaled up.

2. Spray Tubes and/or Spray

a) Dirty.

Guides

 

b) Out of position.

 

 

 

3. Refrigerant Charge

a) Low.

 

 

4. Water Supply

a) Low water pressure.

 

b) External water filters clogged.

 

 

 

c) Insufficient water line size.

 

Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) water

 

tubing or equivalent.

 

 

 

d) Too cold.

 

 

5. Control Board

a) Thermistor connection loose (K3).

See "II.C. Control Board Check"

b) Defective.

 

 

6. Thermistor

a) Loose, disconnected, or defective.

See "II.F. Thermistor Check"

 

 

 

7. Hot Gas Valve

a) Erratic or closed.

 

 

8. Inlet Water Valve

a) Screen or orifice clogged.

9. Compressor

a) Inefficient or off.

10. Liquid Line Valve

a) Erratic or open.

 

 

11. Thermostatic Expansion Valve

a) Defective.

 

 

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Contents Modular Crescent Cuber Models KM-320MAH, MWH Hoshizaki AMERICA, INC Contents Page Page Important Safety Information Additional Warning for Remote Models Construction and Water/Refrigeration Circuit Diagram Air-Cooled Models MAHModel Shown KM-515MAH Model Shown KM-515MWH Water-Cooled Models MWH-MModel Shown KM-901MRH Remote Models MRH/3Water/Refrigeration Circuit Diagram Discharge Line Freeze Pump- Out Minute Harvest Cycle Freeze Cycle Pump-Out Cycle Sequence of Operation Flow ChartTimer Operation G Control Board without Harvest PumpBin Full Icemaker Off Ice Level LoweredIcemaker Off Control Board with Harvest Pump TimerService Diagnosis G Control Board without Harvest Pump Timer Diagnosis Page Page Page OFF Mechanical Bin Control Shutdown Control Board Thermostatic Bin Control TBCControl Board with Harvest Pump Timer Diagnosis Page Page Page Every cycle After 2nd freeze cycle Shutdown Mechanical Bin Control Control Correct LED Board Control Board CheckThermostatic Bin Control Check Bin Control CheckMechanical Bin Control Check Cycle at Shutdown Mechanical Bin Control ActivationModel Shown KM-901MH/3 Mechanical Bin Control CleaningFloat Switch Check Float Switch Check and CleaningFloat Switch Cleaning Thermistor Check Diagnostic Tables No Ice ProductionNo Ice Production Possible Cause Freeze-Up Possible Cause Harvest Cycle Freeze-UpLow Ice Production Freeze-Up Possible CauseLow Ice Production Possible Cause Long Harvest Cycle Low Ice Production Possible Cause Long Freeze Cycle III. Controls and Adjustments Control Board Layout Control BoardControl Board Part Number 2A3792-01 Energized Time LEDs are On Components Min Max Avg LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Every 3 sec Sequence StepControl Board S5 Dip Switch Control Board Only Settings and AdjustmentsDefault Dip Switch Settings S4 Dip Switch G Control BoardsHarvest Timer S4 dip switch 1 Pump-Out Timer S4 dip switch 3S4 Dip Switch Setting Time Sec Pump-Out Frequency Control S4 dip switch 5 Control Board 1st Pump-Out S4 Dip Switch Setting FrequencyBin Control S4 Dip Switch Setting Time Min Factory Use S4 dip switchFreeze Timer S4 dip switch 9 Control Board S4 Dip Switch Setting Pump Motor Time secControl Switch Float Switch Selector S5 dip switch 1 G Control BoardRefill Counter S5 dip switch 2 through 5 G Control Board IV. Refrigeration Circuit and Component Service Information Refrigeration Circuit Service InformationRefrigerant Recovery Evacuation and Recharge R-404A BrazingPage Component Service Information Water Regulating Valve Adjustment water-cooled modelComponent Maintenance Maintenance ScheduleFrequency Area Task VI. Preparing the Appliance for Periods of Non-Use Remove the water from the icemaker water lineRemove the water from the water tank Page VII. Disposal KM-320MAH VIII. Technical Information Specification SheetsWater Cooled Condenser KM-320MWHKM-515MAH KM-515MWH KM-515MRH KM-600MAH KM-650MAH KM-650MWH KM-650MWH-M Awaiting DataKM-650MRH KM-901MAH KM-901MWH KM-901MRH KM-901MRH3 Performance Data 430 352337 7301090 501435 980960 500436 940198 491452 10001190 592503 10401290 661562 1180744 6201080 1060Awaiting Data 1320 632564 12201710 874732 16001550 912827 14801770 889785 15901830 899815 1670Diagrams Without Harvest Pump Timer Relays Wiring DiagramsKM-650MAH, KM-650MWH, KM-901MAH, KM-901MWH KM-650MRH, KM-901MRH KM-901MRH3 KM-515MAH Diagrams With Harvest Pump Timer RelaysKM-650MAH, KM-650MWH, KM KM-650MWH-M KM-650MRH
Related manuals
Manual 50 pages 28.96 Kb Manual 40 pages 33.48 Kb

KM-320MAH, MRH KM-600MAH KM-650MAH, MWH(-M), MRH KM-901MAH, MRH/3 specifications

Hoshizaki, a leading manufacturer in the food service equipment sector, offers a diverse range of ice-making machines that excel in efficiency, durability, and innovative technology. Among the notable models are the Hoshizaki MWH KM-515MAH, MWH(-M), MRH KM-901MAH, MRH KM-600MAH, KM-650MAH, and KM-320MAH. Each model brings unique features designed to meet varying commercial ice production needs.

The Hoshizaki MWH KM-515MAH is particularly recognized for its high ice production capacity, generating up to 515 pounds of ice per day. This model incorporates advanced technology that ensures consistent ice quality and purity. The MWH(-M) variant often includes modifications to suit specific operational environments, ensuring reliability in diverse settings.

Similarly, the MRH KM-901MAH stands out with its ability to produce a staggering 901 pounds of ice per day, making it ideal for high-volume establishments. This model is equipped with Hoshizaki's unique "cubelet" technology, producing a soft, chewable ice perfect for beverages. It also features a robust stainless steel construction, enhancing its durability and resistance to corrosion.

The MRH KM-600MAH offers 600 pounds of daily ice output, while the KM-650MAH enhances that capacity to 650 pounds. Both machines prioritize energy efficiency and come with built-in energy-saving modes. These models feature advanced ice sensing technology that monitors production levels to optimize energy consumption and reduce waste.

On the other hand, the KM-320MAH is designed for smaller establishments, with a daily ice production rate of 320 pounds. Despite its smaller footprint, it maintains high production efficiency and is equipped with features like a built-in storage bin, saving space while ensuring a reliable ice supply.

Across these models, Hoshizaki employs various technologies, including air-cooled and water-cooled systems, offering flexibility depending on installation requirements. The ice machines are designed with user-friendly controls and features like self-cleaning capabilities, making maintenance straightforward and less time-consuming.

In summary, Hoshizaki's ice machines, including the MWH KM-515MAH, MRH KM-901MAH, and others, deliver exceptional ice production, durability, and efficiency tailored to meet the demands of any commercial kitchen or service establishment. With a commitment to quality, Hoshizaki continues to be a trusted choice for businesses needing reliable ice-making solutions.
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