Hoshizaki Complete Sequence of Operation for Ice Machines
Page 14

"E" and "G" Control Board Without Harvest Pump Timer Operation Flow Chart

Cycle

 

 

 

1. 1-Minute

2. Harvest Cycle

 

3. Freeze Cycle

 

 

4. Pump-Out Cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Steps

 

 

 

Fill Cycle

 

• Maximum inlet water valve time: 6 min.

 

 

• Minimum freeze time: 5 min.

• Factory set for every

 

 

 

 

 

 

 

 

 

 

 

 

 

• Maximum harvest time: 20 min.

 

 

• Maximum freeze time: freeze

10th cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

timer setting

 

 

(except KM‑515M_H)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(S4 dip switch 9 & 10)

(S4 dip switch 5 & 6)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermistor in

 

 

 

 

1 to 3-min. harvest

 

 

 

5-min. minimum

 

 

• Pump motor stops for

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 sec., then reverses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FS in control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control

 

 

 

 

 

timer in control

 

 

 

freeze timer in

 

for 10/20 sec. (S4 dip

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Startup

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(S4 dip switch 1 & 2)

 

 

 

 

 

control

 

 

 

 

switch 3 & 4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FS check

 

 

 

FS closed

 

 

 

 

 

 

 

FS check

 

 

 

FS closed

 

 

 

 

FS opens or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WV energized

Comp energized

Thermistor temperature

 

 

Comp continues

 

freeze timer

Comp continues

 

 

 

 

 

reaches 48°F (9°C) (3.9 kΩ

 

 

 

terminates

FMR continues

 

 

 

 

 

 

 

 

 

 

 

FMR energized

 

 

FMR continues

 

 

 

 

 

 

 

 

 

 

 

 

or less). Harvest timer starts

 

 

 

 

HGV energized

 

 

 

 

 

 

 

 

 

FS open

HGV energized

 

 

FM energized

 

 

 

 

 

 

 

 

 

 

 

(1 to 3 min.).

 

 

 

 

WV energized (KM-320M_H S4 dip

 

 

 

 

 

 

 

 

 

WV energized

 

 

LLV energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

switch 3 & 4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PM energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FS open

 

 

HGV de-energized

 

 

PM de-energizes for 2 sec.,

 

 

 

 

 

If FS is open, Comp stops and cycle returns to 1-min. fill.

 

 

WV de-energized

 

 

then reverses for 10/20 sec.

 

 

 

 

 

 

 

 

 

FM de-energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LLV de-energized

14

Shutdown and Restart See next page.

1. "E" and "G" Control Board without Harvest Pump

A. Sequence of Operation Flow Chart

II. Sequence of Operation and ServiceDiagnosis

Legend:

Comp–compressor FM–fan motor FMR–fan motor-remote FS–float switch HGV–hot gas valve LLV–liquid line valve PM–pump motor WV–inlet water valve

Components Energized when the Control Switch is in the "WASH" Position

The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in the "WASH" position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer flow over the outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer flow over both the outside and the inside of the evaporator plate assembly.

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not restart when the control switch is placed in the "ICE" position.

Timer Operation

Page 13 Page 15
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Page 13 Page 15
Contents Modular Crescent Cuber Models KM-320MAH, MWH Hoshizaki AMERICA, INC Contents Page Page Important Safety Information Additional Warning for Remote Models Model Shown KM-515MAH Construction and Water/Refrigeration Circuit DiagramAir-Cooled Models MAH Water-Cooled Models MWH-M Model Shown KM-515MWHRemote Models MRH/3 Model Shown KM-901MRHWater/Refrigeration Circuit Diagram Discharge Line Freeze Pump- Out G Control Board without Harvest Pump Sequence of Operation Flow ChartTimer Operation Minute Harvest Cycle Freeze Cycle Pump-Out CycleIcemaker Off Bin FullIcemaker Off Ice Level Lowered Timer Control Board with Harvest PumpService Diagnosis G Control Board without Harvest Pump Timer Diagnosis Page Page Page OFF Shutdown Control Board Thermostatic Bin Control TBC Mechanical Bin ControlControl Board with Harvest Pump Timer Diagnosis Page Page Page Every cycle After 2nd freeze cycle Shutdown Mechanical Bin Control Control Board Check Control Correct LED BoardBin Control Check Thermostatic Bin Control CheckCycle at Shutdown Mechanical Bin Control Activation Mechanical Bin Control CheckMechanical Bin Control Cleaning Model Shown KM-901MH/3Float Switch Check and Cleaning Float Switch CheckFloat Switch Cleaning Thermistor Check No Ice Production Possible Cause Diagnostic TablesNo Ice Production Freeze-Up Freeze-Up Possible Cause Harvest CycleLow Ice Production Possible Cause Long Harvest Cycle Low Ice ProductionFreeze-Up Possible Cause Low Ice Production Possible Cause Long Freeze Cycle III. Controls and Adjustments Control Board Control Board LayoutControl Board Part Number 2A3792-01 Sequence Step LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Every 3 sec Energized Time LEDs are On Components Min Max AvgControl Board S4 Dip Switch G Control Boards Settings and AdjustmentsDefault Dip Switch Settings S5 Dip Switch Control Board OnlyS4 Dip Switch Setting Time Sec Harvest Timer S4 dip switch 1Pump-Out Timer S4 dip switch 3 Bin Control Pump-Out Frequency Control S4 dip switch 5Control Board 1st Pump-Out S4 Dip Switch Setting Frequency Control Board S4 Dip Switch Setting Pump Motor Time sec Factory Use S4 dip switchFreeze Timer S4 dip switch 9 S4 Dip Switch Setting Time MinRefill Counter S5 dip switch 2 through 5 G Control Board Control SwitchFloat Switch Selector S5 dip switch 1 G Control Board Refrigerant Recovery IV. Refrigeration Circuit and Component Service InformationRefrigeration Circuit Service Information Brazing Evacuation and Recharge R-404APage Component Component Service InformationWater Regulating Valve Adjustment water-cooled model Frequency Area Task MaintenanceMaintenance Schedule Remove the water from the water tank VI. Preparing the Appliance for Periods of Non-UseRemove the water from the icemaker water line Page VII. Disposal VIII. Technical Information Specification Sheets KM-320MAHKM-320MWH Water Cooled CondenserKM-515MAH KM-515MWH KM-515MRH KM-600MAH KM-650MAH KM-650MWH Awaiting Data KM-650MWH-MKM-650MRH KM-901MAH KM-901MWH KM-901MRH KM-901MRH3 Performance Data 730 352337 430980 501435 1090940 500436 9601000 491452 1981040 592503 11901180 661562 12901060 6201080 744Awaiting Data 1220 632564 13201600 874732 17101480 912827 15501590 889785 17701670 899815 1830Wiring Diagrams Diagrams Without Harvest Pump Timer RelaysKM-650MAH, KM-650MWH, KM-901MAH, KM-901MWH KM-650MRH, KM-901MRH KM-901MRH3 Diagrams With Harvest Pump Timer Relays KM-515MAHKM-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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