Hoshizaki MWH(-M), MWH KM-515MAH, MRH/3 G Control Board without Harvest Pump Timer Diagnosis

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

3)Power On: Turn on the power supply, then move the control switch to the "ICE" position. A 5‑sec. delay occurs.

•"E" Control Board: CB red "POWER OK" LED turns on.

•"G" Control Board: CB red "POWER OK" LED and green "BC CLOSED" LED turn on.

Note: • CB red "POWER" LED remains on unless the 10.5VAC power supply is interrupted (K2 connector).

•Check CB using the steps in "II.C. Control Board Check."

•"G" CB: If yellow "BC OPEN" LED is on (indicating a full bin), check MBC.

See "II.D.2. Mechanical Bin Control Check and Cleaning."

a)Power On Diagnosis: If CB red "POWER OK" LED is off, confirm closed TBC and 10A fuse is good. If TBC is open, remove ice from bulb and warm bulb in hand. If TBC does not close, replace TBC. See "II.D.1. Thermostatic Bin Control Check." Check for 115VAC at control switch #1 (BR) to neutral (W) then at control switch #2 (P) to neutral (W). If 115VAC is present on #1 (BR) and not on #2 (P), replace control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at HPS (P) to neutral (W) then HPS (BK) to neutral (W). If 115VAC is present at HPS

(P)and not at HPS (BK), HPS is open. See HPS Diagnosis below. If 115VAC is present at HPS (BK), check for 10.5VAC at CB K2 #1 red wire to CB K2 #2 red wire. If 10.5VAC is not present, check that the cleaning valve is closed and the interlock switch is closed. Next, check CT continuity. If open replace CT.

b)HPS Diagnosis: Check that the condenser coil is not clogged or restricted. Let refrigeration circuit pressures equalize. If HPS does not reset and pressures are equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and diagnose refrigeration circuit restriction. Check that there are no restrictions in the refrigeration circuit.

Harvest Cycle: HGV, strainer, or check valve.

Freeze Cycle: FM, FMR, TXV, HM, LLV, strainer, check valve, drier, and damaged line set or fitting. Also confirm WRV opens in freeze cycle.

Confirm that the location meets installation requirements:

•The icemaker is not intended for outdoor use. Normal operating ambient temperature should be within 45°F to 100°F (7°C to 38°C).

•Allow 6" (15 cm) clearance at rear, sides, and top for proper air circulation and ease of maintenance and/or service should they be required.

•The appliance should not be located in a corrosive environment.

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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 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 CycleBin Full Icemaker Off Ice Level LoweredIcemaker Off 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 Diagnostic Tables No Ice ProductionNo Ice Production Possible Cause Freeze-Up Freeze-Up Possible Cause Harvest CycleLow 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 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 OnlyHarvest 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 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 MinControl 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 Brazing Evacuation and Recharge R-404APage 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 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
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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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