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 and servicing much easier. A solid state
sequence timer provides automatic control over the continuous ice making process. Hoshizaki Flakers
and DCMs utilize an internal auger system with the 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 surfaces, helping increase efficiency and extending component life. The bearings 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 float 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 startup and
shutdown process for the Flaker is operated by a series of timing circuits designed 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 a full reservoir, operation is turned
over to the bend control magnetic proximity switch and if it's closed the unit begins ice production.
At this point, the gear motor and condenser fan 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 reset gear motor protector will shut the unit down. After one
minute the compressor starts. This delay allows any ice left in the evaporator cylinder to be cleared.
As the refrigeration system cools the water 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 bin control which opens the magnetic proximity switch and begins the
shutdown process. On the M model Flaker the gear motor, compressor, and fan 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 fan stop. The unit will now sit idle until the ice is moved 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 the manual
flush switch, when periodic cleaning or maintenance is required. When the flush timer or manual switch
is activated, the Flaker unit cycles 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 mechanical seal 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 silicone content in the water. If not replaced, excessive bearing
wear may cause damage to both the auger and evaporator cylinder. To remove the auger for
inspection, drain the water system, remove the clear ice shoot head and shoot bracket.
Next, remove the stainless steel bolt that holds 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, into the gap
between the auger bearing surface and bearing. If the bearing gap is more than 0.02 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 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 secure the evaporator 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 by
an O-ring. Care should be taken to protect the O-ring for reuse or replace it if 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.