Hoshizaki DCM 300BAH(-OS) service manual Sequence of Operation, Sequence Cycles and Shutdown

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B. Sequence of Operation

1. Sequence Cycles and Shutdown

The steps in the sequence are as outlined below. When power is supplied, power switch is in the "ON" position, safety switch is engaged, and the control switch is in the "ICE" position, CB "POWER" LED turns on. The "POWER" LED indicates control voltage and will remain on unless a control voltage problem occurs. If icemaker does not start, BC actuator and proximity switch may be engaged. Move the dispense mode switch to the "CONTINUOUS" position, then dispense ice to lower the level of ice in the storage bin.

a)Fill Cycle

Reservoir is empty. LF/S and UF/S are open. WV energizes and fill cycle starts.

LF/S closes. Nothing happens at this time. Reservoir continues to fill until UF/S closes. When UF/S closes, WCR energizes, closing low water safety circuit and de‑energizing WV. GM energizes once UF/S closes.

b)Ice Purge Cycle

"GM" LED is on. GM energizes. 60-sec. ice purge timer starts. Note: GM cannot energize unless UF/S is closed.

c)Freeze Cycle

"COMP" and "GM" LEDs are on. 60-sec. ice purge timer terminates. GM continues. CB confirms GM operation through GMPR terminal #3 (BR wire) and terminal

#5 (DBU wire), then Comp and FM energize. Ice production starts 4 to 6 min. after Comp energizes depending on ambient and water temperature conditions. UF/S and LF/S operate WV as needed to continue the icemaking process. Refill: As ice is produced the water level in the reservoir drops. UF/S opens. Nothing happens at this time. LF/S opens. FT starts. WCR de‑energizes, energizing WV. As water fills the reservoir, LF/S closes. Nothing happens at this time. Water continues to fill and UF/S closes. FT terminates and WCR energizes, closing low water safety circuit and de-energizing WV. If UF/S remains open longer than 90 sec. after LF/S opens (FT exceeded), Comp and FM de-energize. GM de-energizes 60 sec. later. WV remains energized until UF/S closes. The freeze cycle continues until BC shuts the icemaker down, a drain cycle occurs, or power is turned off to the icemaker.

d)Drain Cycle

"FLUSH" LED is on. The drain cycle occurs once every 12 hrs. for 20 min.

12-hr. DCT terminates, DVT starts. Comp and FM de-energize. GM de‑energizes 60 sec. later. DV energizes. DV remains energized for the remainder of the drain cycle.

e)Shutdown

BC activates, 150-sec. shutdown sequence starts. After 90 sec., Comp and FM de‑energize, AM energizes for 0.6 seconds, 60 sec. later, GM de-energizes.

Legend: AM–agitating motor; BC–bin control; CB–control board; Comp–compressor; DCT–drain cycle timer (12-hr. timer); DV–drain valve; DVT–drain valve timer (20‑min. timer); FM–fan motor; FT–fill timer (90-sec. low water safety); GM–gear motor; GMPR–gear motor protect relay; LF/S–lower float switch; UF/S–upper float switch; WCR–water control relay; WV–inlet water valve

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Contents DCM-300BAH-OS Hoshizaki AMERICA, INC Contents Page Important Safety Information Page Specifications Icemaker DCM-300BAH-OSII. General Information Construction IcemakerIcemaking Unit Sequence of Operation Sequence Cycles and ShutdownShutdown & Restart Sequence Flow ChartCycle Steps 12-Hr. Drain CycleControl Board Control Board Layout DCM-PB Push Button Model Control BoardControl Board K5 Connector DCM-OS Opti-Serve Model Control BoardPower Switch Power Switch, Control Switch, and Dispense Mode SwitchLED Lights and Components Control Switch Dispense Mode SwitchPage Wiring Diagrams DCM-300BAH-OS Performance Data Diagnostic Procedure IV. Service DiagnosisIce Production Check Page Page Page Page Control Board Check 5VDC Output ChecksPage Opti-Serve Model ICE and AM LEDs are on K5 Pin #7 R wire Page Bin Control Check Float Switch Check and Cleaning Float Switch CheckFloat Switch Cleaning Startup Diagnostic ChartsNo Ice Production Fill CycleIce Purge Cycle ShutdownIce Dispense Opti-Serve Ice/Water DispenseIce Dispense Push Button Water Dispense Push Button3b. Ice Dispense Portion Opti-Serve OS Sensors3a. Ice Dispense Continuous 3c. Water DispenseRemoval and Replacement of Components Service for Refrigerant LinesBrazing Refrigerant RecoveryEvacuation and Recharge R-404A Important Notes for Component Replacement Evaporator Assembly Removal and Replacement of Extruding Head Upper Bearing Wear CheckRemoval and Replacement of Auger Removal and Replacement of EvaporatorPage 5b. Lower Housing Removal and Replacement of Gear Motor Dispense Auger and Agitator Dispense or Agitating MotorVI. Cleaning and Maintenance Cleaning and Sanitizing Instructions Water SystemSanitizing Solution Cleaning and Sanitizing Procedure Dispense ComponentsWater Dispense Nozzle Ice Dispense Spout Spout Cover Maintenance Schedule MaintenanceFrequency Area Task Preparing the Icemaker for Periods of Non-Use VII. Disposal

DCM 300BAH(-OS) specifications

The Hoshizaki DCM 300BAH(-OS) is a high-performance ice and water dispenser designed to meet the demands of various commercial environments. Known for its reliability and efficiency, this machine is widely used in restaurants, hotels, and catering services where a continuous supply of ice is essential.

One of the standout features of the DCM 300BAH(-OS) is its ability to produce crescent-shaped ice, which is favored in many settings for its hardness and slow-melting properties. This type of ice helps maintain the temperature of beverages longer without diluting them too quickly, making it ideal for mixed drinks and soft drinks alike.

Technology-wise, the Hoshizaki DCM 300BAH(-OS) integrates advanced refrigeration components that enhance energy efficiency. The machine is designed with a patented cooling system that reduces energy consumption while maintaining optimal ice production. Moreover, it is equipped with a highly efficient compressor that ensures quick recovery times even during peak usage.

One characteristic that sets this model apart is its space-saving design. With a footprint that allows for easy placement in tight quarters, it is particularly suited for establishments with limited counter space. The sleek and contemporary exterior also means it complements a variety of decor styles, making it a versatile addition to any commercial kitchen or bar.

The unit boasts a user-friendly interface, with easy-to-read indicators for ice and water levels, allowing staff to manage operations seamlessly. Additionally, the DCM 300BAH(-OS) features a self-cleaning cycle, which automates the sanitation process to ensure the utmost hygiene standards are maintained. This feature not only saves time but also enhances the longevity of the unit by reducing wear and tear.

Its durable construction is another strong point. Built from high-quality stainless steel, the DCM 300BAH(-OS) is resistant to corrosion and wear, ensuring it can withstand the rigors of daily use. Furthermore, Hoshizaki products are renowned for their reliability, and this model upholds that reputation, providing consistent performance with minimal downtime.

In summary, the Hoshizaki DCM 300BAH(-OS) stands out for its efficient ice production, innovative technology, space-saving design, user-friendly features, and robust durability, making it an ideal choice for any business that requires a reliable ice and water dispensing solution.
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