Hoshizaki MRH/3, MWH KM-515MAH, MWH(-M) LED Lights and Audible Alarm Safeties, Sequence Step

Page 44

B. LED Lights and Audible Alarm Safeties

1. "E" Control Board

At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when power is turned off. The red "POWER OK" LED indicates proper control voltage and remains on unless a control voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2.

Sequence Step

LED

Energized

 

Time LEDs are On

Components

Min.

 

Max.

Avg.

 

 

 

1-Minute Fill Cycle

4

WV

 

 

 

1 minute

Harvest Cycle

1, 4, 2

Comp, FMR, HGV, WV

2 minutes

 

20 minutes

3 to 5 minutes

Freeze Cycle

1

Comp, FM/FMR, PM,

5 minutes

 

freeze timer

30 to 35 minutes

 

 

LLV

 

 

setting

 

Pump-Out Cycle

1, 4*, 3, 2

Comp, FMR, HGV, PM,

10 seconds

 

20 seconds

*pump-out timer

 

 

WV*

 

 

 

 setting

The built in safeties shut down the icemaker and have alarms as listed below.

No. of Beeps

Type of Alarm

Notes

(every 3 sec.)

 

 

1

High Evaporator Temp.

Check for harvest problem (stuck HGV or relay), hot

 

(temperature > 127°F) (53°C)

water entering icemaker, or shorted thermistor.

2

Harvest Backup Timer

Orange "H TIMER" LED on.

 

(harvest > 20 min. for two cycles

Check for open thermistor, HGV not opening, TXV or

 

in a row)

LLV leaking by, low charge, or inefficient Comp, or WRV

 

 

leaking by.

3

Freeze Timer

Yellow "F TIMER" LED on.

 

(freeze > specified setting for

Check for FS stuck closed (up), WV leaking by, HGV

 

two cycles in a row)

leaking by, PM not pumping, TXV not feeding properly,

 

 

LLV not opening, low charge, HM not bypassing, or

 

 

inefficient Comp.

To reset the above safeties, press the "ALARM RESET" button with the power supply on.

6

Low Voltage

Red LED turns off if voltage protection operates.

 

(92Vac±5% or less)

The control voltage safeties automatically reset when

7

High Voltage

voltage is corrected.

 

(147Vac±5% or more)

 

Legend: Comp–compressor; FM–fan motor; FMR–fan motor remote; FS–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet water valve

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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 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 Sequence of Operation Flow Chart Timer OperationG Control Board without Harvest Pump 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 LED Lights and Audible Alarm Safeties No. of Beeps Type of Alarm Every 3 secSequence Step Energized Time LEDs are On Components Min Max AvgControl Board Settings and Adjustments Default Dip Switch SettingsS4 Dip Switch G Control Boards 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 Factory Use S4 dip switch Freeze Timer S4 dip switch 9Control Board S4 Dip Switch Setting Pump Motor Time sec 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 352 337730 430501 435980 1090500 436940 960491 4521000 198592 5031040 1190661 5621180 1290620 10801060 744Awaiting Data 632 5641220 1320874 7321600 1710912 8271480 1550889 7851590 1770899 8151670 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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