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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Hoshizaki MRH/3 LED Lights and Audible Alarm Safeties, Sequence Step, Energized Time LEDs are On Components Min Max Avg
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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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