B. Sequence of Operation

1. Sequence Cycles and Shutdown

a) KM-1601SAH/3 "G" Control Board

IMPORTANT

KM-1601SAH/3 utilize a "G" control board and TBC. For KM-1601SAH/3 operation, the K4 jumper (4A4883G01) must be in place on the control board RED K4 connector or the unit will not operate.

The steps in the sequence are as outlined below. When power is supplied, CB red "POWER OK" LED and green "BC CLOSED" LED turn on. If red "POWER OK" LED is off, clear ice away from TBC bulb in the storage bin area. If yellow "BC OPEN" LED is on, the unit will not start. In this case check that CB has the K4 jumper in place on CB RED K4 connector. There is a 5-second delay before startup. Note that the order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.

(1) 1-Minute Fill Cycle

LED 4 is on. WV and X11 relay energize and the 1-minute fill cycle begins. After

1 minute, CB checks for a closed F/S. If F/S is closed, the harvest cycle begins. If open, WV remains energized through additional 1-minute fill cycles until water fills the water tank and closes F/S. This serves as a low water safety to protect PM.

(2) Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV and X11 relay remain energized, Comp, FM, HGV, and X10 relay energize. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads a 3.9 kΩ signal from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 seconds. For details, see "II.C.3.b) Harvest Timer (S4 dip switch 1 & 2)." WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter. CAUTION! Do not adjust S4 dip switch 7 out of the factory default position on this model. Adjustment outside of the factory default position may result in damage to the icemaker. LED 4 turns off when WV and X11 relay de‑energize. LED 3 turns on and PM energizes and runs for the last 0 or 50 seconds of harvest depending on S4 dip switch 7 setting. This circulates water over the evaporator for the last 0 or 50 seconds of harvest. PM is energized through CB K1 ten‑pin connector pin #5 (DBU wire) and the X10 relay. When the harvest timer terminates, the harvest cycle is complete. CB checks the position of F/S and proceeds to the freeze cycle if it is closed or calls for a 1‑minute fill cycle if it is open. The minimum total time allowed by CB for a complete harvest cycle is 2 minutes.

(3) Freeze Cycle

LED 1 is on. Comp and FM remain energized, PM energizes or remains energized depending on harvest pump timer (S4 dip switch 7) setting. LLV energizes. HGV and X10 relay de‑energize. The unit is held in freeze by a 5-minute short cycle protection timer (CB will not accept a signal from F/S during the first 5 minutes of freeze). After the 5-minute short cycle protection timer terminates, CB turns freeze termination over to F/S. As ice builds on the evaporator, the water level in the water tank lowers. The freeze cycle

21

Page 20 Page 22
Page 21
Image 21
Hoshizaki KM-1601SWH/3, KM-1601SAH/3, KM-1601SRH/3 service manual Sequence of Operation, Sequence Cycles and Shutdown
Page 20 Page 22

KM-1601SWH/3, KM-1601SRH/3, KM-1601SAH/3 specifications

Hoshizaki has long been a trusted name in the world of commercial refrigeration and ice-making equipment. Among its offerings, the KM-1601SAH/3, KM-1601SRH/3, and KM-1601SWH/3 models stand out for their innovative features and robust design. These machines are integral for businesses that require reliable and efficient ice production, such as restaurants, hotels, and convenience stores.

At the core of these models is Hoshizaki's renowned Crescent Cube Technology, which produces clear, crescent-shaped ice that is ideal for both beverage service and food presentation. The unique shape of the ice ensures reduced melting rates, helping to maintain beverage temperature for longer periods while minimizing dilution. Additionally, the crescent ice is less prone to clumping, making it easier to dispense and ideal for high-volume use.

One of the key features of the KM-1601 series is its exceptional ice production capacity. Each model can produce up to 1,600 pounds of ice in a 24-hour cycle, making them suitable for heavy-demand environments. The machines are constructed with a durable stainless steel exterior, providing not only a sleek look but also enhanced resistance to corrosion and easy maintenance.

The KM-1601SAH/3 is designed with a built-in ice storage bin, allowing for seamless integration into various setups. Its state-of-the-art refrigeration system ensures optimal energy efficiency, which is crucial for businesses looking to manage operational costs. The KM-1601SRH/3 includes a self-contained design, simplifying installation and reducing the need for external ice storage solutions.

For users concerned with hygiene, these models boast advanced sanitation features. Hoshizaki's Antimicrobial Agent is incorporated into key components to inhibit the growth of bacteria and slime, ensuring cleaner ice production. The machines also feature easy-to-access panels for quick cleaning and maintenance, reducing downtime.

Another significant characteristic is their user-friendly controls, which simplify operation and monitoring of ice production. The built-in monitoring system alerts users to any potential issues, allowing for proactive maintenance and minimal disruption to service.

The KM-1601SWH/3 model further enhances the lineup with its energy-efficient design, lightweight construction, and compact footprint, making it perfect for establishments with limited space. Collectively, these models reflect Hoshizaki's commitment to innovation, efficiency, and reliability in ice-making technology, making them a top choice for businesses that require substantial ice production without compromising on quality or safety. Whether you need a powerful ice machine for a bar, restaurant, or convenience store, Hoshizaki’s KM-1601 series delivers performance that you can depend on.
Top Page Image Contents