Before we begin to describe the basic operation of the flaker and DCM models, let's look at some of the features and benefits that make Hoshizaki machines so dependable and serviceable. Removable panels make regular maintenance checks much easier. A solid state sequence timer provides automatic control over the continuous ice making process. Hoshizaki flakers and DCMs utilize and internal auger system with a direct drive spline coupled gear motor for dependable operation. A fully insulated stainless steel evaporator provides a durable freezing surface. Anti-magnetic stainless steel is used to eliminate pitting and corrosion on the evaporator and auger surface, helping increase efficiency and extending component life. The bearing are sleeve type alignment bearings. The carbon resin bearing material has a graphite base to provide lubrication eliminating possible grease contamination. The auger is driven by a sealed gear motor assembly which is protected by two overload sensing systems that protect against undue stress. A unique low water safety device developed by Hoshizaki shuts the unit down automatically if the unit switches fail to detect water in the reservoir. The unit will restart the ice making process only when the water level is restored. Removable panels, a solid state sequence timer, anti-magnetic, stainless steel evaporator and auger, carbon alignment bearings, a sealed gear motor with overload protection, and a low water safety device. Just some of the features and benefits of the Hoshizaki flaker and DCM models that help make your job easier. Now, let's look at the basic sequence of operation of the Hoshizaki flakers and DCMs. The complete start up and shut down process for the flaker is operated by a series of timing circuits built into the solid state timer board. With the power switch on and the flush switch in the ice position, the inlet water valve opens allowing water to fill the reservoir. The ice making process will not begin until the reservoir is filled. When the dual float switches indicate the reservoir is filled, operation is turned over to the bend controlled magnetic proximity switch. And if it is closed, the unit begins ice production. At this point, the gear motor and ice condenser start up. Should the gear motor not start, a gear motor protect relay will automatically shut the unit down to protect against any component damage. If at any time during operation, the sealed gear motor should experience stress which causes an excessive amperage increase, a manual gear motor reset protector will shut the unit down. After one minute, the compressor starts, this delay will allow any ice left in the evaporator cylinder to be cleared. As the refrigeration system clears the water left in the evaporator cylinder, ice begins to form and is extruded within two to five minutes. Ice production will continue until the bin is full. Once the bin is full, ice pushes against the control which opens the magnetic proximity switch and begins the shut down process. On the M model flaker the gear motor, fan, and compressor, stop within six seconds after the bin control indicates a full bin of ice. A time delay is used in the smaller flakers and DCM units to allow the gear motor to clear the evaporator of ice. On these models, one minute after the bin control switch opens, the compressor stops. One minute later the gear motor and condenser stop. The unit will now sit idle until the ice is scooped away from the bin control which will cause the proximity switch to close and restart the unit. Unique among Hoshizaki flakers, is the automatic flush period. Designed to provide cleaner operation and longer bearing life. The automatic flush is operated by a 12 hour timer. The flush feature can also be operated by a manual flush switch when periodic cleaning and maintenance is required. When the flush timer or manual switch is activated, the flaker unit switches off within two minutes. One minute after either switch opens, the compressor shuts down. Followed a minute later by the gear motor and condenser fan. Next the flush valve opens allowing the complete water system to drain while on the flush timer the unit remains off for 15 minutes. Any ice remaining in the evaporator melts and the evaporator walls and chamber are completely flushed out. During this time, the inlet water valve will not be activated. During normal operation, the auger rotates inside the evaporator cylinder to break ice away from the cylinder walls and move it up to the extruding head and cutter. Because the auger is one of the major moving parts in the ice maker, it must be checked periodically for excessive bearing wear. Although flaker bearings are constructed of carbon impregnated resin, they may wear due to high mineral or silica content in the water. If not replaced, excessive bearing wear may cause damage to the auger and evaporator cylinder. To remove the auger for inspection, drain the water system, remove the clear ice shoot head and ice shoot bracket. Next, remove the stainless steel bolt that hold the cutter to the auger. Replace the bolt and use it to rock the auger back and forth to check for excessive play. To check for bearing wear, attempt to slip the 20,000th inch feeler gauge available through Hoshizaki between the auger bearing surface and bearing. If the bearing gap is more than .02 inches, replace both the top and bottom bearings. To remove the auger for bearing replacement, remove the allen head cap screws and water seals which hold the extruding head to the evaporator cylinder. Using the bolt and a large washer, or the cutter head installed upside down to hold the auger, lift the auger and extruding head up and out of the evaporator cylinder. When the auger has been lifted out, remove the extruding head and visually inspect the auger bearing surface for wear. The sleeve bearings are pressed into the extruding head and lower housing. To remove the lower housing, remove the allen head cap screws which hold the cylinder to the housing. Loosen the belly band screw, and lift the evaporator up about four inches. Then, tighten the screw to hold the evaporator in place. The housing and cylinder are sealed with an O ring. Care should be taken to protect the O ring for reuse. Or replace it when necessary when reassembling the unit. Remove the bolts at the base of the housing and remove the housing to replace the lower bearing. Have the bearings repressed and replace the parts in reverse order.
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Watch this video to learn about the features of Hoshizaki Flakers/DCMs as well as some of the maintenance procedures to keep your machine up and running.
Hoshizaki is an industry leader in manufacturing commercial ice machines. They offer a variety of ice shapes to suit any site application. From cube ice to chewable ice and even flaked ice, Hoshizaki has options for every sector of food service.
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