Hoshizaki“A Superior Degreeof Reliability”www.hoshizaki.comModelsDCM-750BAHDCM-750BAH-OSDCM-750BWHDCM-750BWH-OSCubelet Icemaker / DispenserHoshizaki
02. DCM-750BWH(-OS)Storage BinInlet Water ValveReservoirControl BoxWater-Cooled CondenserSpout CoverEvaporator AssemblyCompressorDispensing Motor Agi
B. Ice Making Unit1. DCM-750BAH(-OS)Cubelet CutterAllen Head Cap ScrewGear MotorO-RingMechanical SealExtruding Headand Upper BearingHex Head Bolt wi
C. Sequence of OperationThe steps in the sequence are as outlined below. When power is supplied, the power switch is in the "ON" position,
3Legend:BC - bin controlComp - compressorDC - drain cycleDT - drain timerDV - drain valveFMS - self-contained fan motorFT - ll timer (low water safe
4D. Control Board• A Hoshizaki exclusive solid-state control board is employed in DCM-750BAH, DCM-750BAH-OS, DCM-750BWH, and DCM-750BWH-OS Cubelet Ic
5Microprocessor (board revision level indicated by last digits on label)"POWER" LED(lights when power is supplied to the board)"FLUS
6Dispensing Components See "III.B. Wiring Diagrams" for details.Bin Control, Control Switch,Low Water SafetyMicroprocessor (board revision
72. FeaturesThe control board provides the following safeguards:• Provides component protection during low water supply.• Purges remaining ice in the
83. Controls and Adjustments a) Portion ControlWhen the dispense mode switch is placed in the "PORTION" position, a variable resistor (loca
93. 60 seconds after the "GM" LED comes on, the "COMP" LED comes on, and the compressor and fan motor start. If the "COMP&qu
IMPORTANTOnly qualied service technicians should attempt to install, service, or maintain this icemaker. No service or maintenance should be underta
0E. Float SwitchDepending on local water conditions, scale may build up on the oat switch. Scale on the switch can cause the oats to stick. In this
III. Technical InformationA. Water Circuit and Refrigeration Circuit1. DCM-750BAH(-OS)Inlet Water ValveDispensing Water ValveDrain ValveFloat Switch
2. DCM-750BWH(-OS) Inlet Water ValveDispensing Water ValveDrain ValveFloat SwitchWater LevelTo DrainEvaporatorSpoutExpansion ValveGear MotorOverowR
3BK BLACKBR BROWNBU BLUEDBU DARK BLUEGY GRAYLBU LIGHT BLUEO ORANGEP PINKR REDV VIOLETW WHITEY YELLOWW/BK WHITE/BLACKW/BR WHITE/BROWNW/BU WHITE/BLUEW/
42. DCM-750BAH-OS, DCM-750BWH-OS BK BLACKBR BROWNBU BLUEDBU DARK BLUEGY GRAYLBU LIGHT BLUEO ORANGEP PINKR REDV VIOLETW WHITEY YELLOWW/BK WHITE/BLACKW
5C. Sequence of Electrical Circuit – Ice Making1. Fill Cycle With the power switch in the "ON" position and the control switch in the "
62. Ice Purge Cycle Upper oat switch closes, water control relay energizes, inlet water valve closes, gear motor starts, gear motor protect relay en
73. Freeze Cycle Compressor and fan motor start 60 seconds after gear motor starts.BK BLACK O ORANGE W/BK WHITE/BLACKBR BROWN P PINK W/BR WHITE/BROWN
84. 12 Hour Drain Cycle / Drain Switch hour timer initiates cycle or the control switch is moved to the "DRAIN" position. 90 seconds afte
95. ShutdownThe bin control switch is activated and a 50 second shutdown sequence begins. After the bin control has been open for 90 seconds, the co
3IMPORTANTThis manual should be read carefully before the icemaker is serviced ormaintenance operations are performed. Only qualied service technicia
306. Low Water Safety Upper oat switch fails to close within 90 seconds after the lower oat switch opens, the 50 second shutdown sequence begins. T
37. High Pressure Switch When the high pressure switch opens, the compressor stops immediately, 60 seconds later the gear motor stops. To restart, al
3D. Sequence of Electrical Circuit – Dispensing 1. Continuous DispenseAgitating motor energizes for .6 seconds for every seconds of accumulative d
332. Portion DispenseAgitating motor energizes for .6 seconds for every seconds of accumulative dispense time. A variable resistor which controls t
34E. Performance Data1. DCM-750BAH(-OS)Note:. The data without *marks should be used for reference only.. We reserve the right to make changes in sp
352. DCM-750BWH(-OS)Note:. The data without *marks should be used for reference only.. We reserve the right to make changes in specications and des
36IV. Service DiagnosisA. Diagnostic ProcedureThis diagnostic procedure is a sequence check that allows you to diagnose the electrical system and comp
376) Rell /Low Water Safety – As ice is produced, the water level in the reservoir drops. As the water level drops, the upper and lower oat switches
38C. Diagnostic Charts1. No Ice ProductionProblem Possible Cause Remedy[]The icemaker will not start. (Fill Cycle)a) Power Supply . Off, blown fuse,
39Problem Possible Cause Remedy[]The icemaker will not start. (Fill Cycle) (continued)m)High Pressure Switch . Bad contacts. . Check for continuity
4E. Performance Data ... 34. DCM-750BAH(-OS) ...
40Problem Possible Cause Remedy[3]Ice purge cycle will not start.a) Water Control Relay . Low water safety circuit open (bad contacts ).. Replace.b
4Problem Possible Cause Remedy[5] All components run, but no ice is produced. (continued)d) Evaporator . Defective. . Replace.e) Water Supply Line
43. OtherProblem Possible Cause Remedy[]Icemaker will not stop when bin is lled with ice.a)Bin Control . Actuator sticking. . Adjust or replace.
43Problem Possible Cause Remedy[4] Gear motor overload protector operates frequently or fuse blows frequently.a)Power Supply . Not within specicatio
44Problem Possible Cause Remedy[]Abnormal noise. a) Gear Motor or Gear Head. Bearing worn out. . Replace.b) Auger Mechanism . Bad alignment of aug
45Problem Possible Cause Remedy[]No water dispensed. a) OS Sensor . Dirty sensor. . Clean..Defective. . See chart 5c below.b) Dispense Mode Switc
46V. Removal and Replacement of ComponentsIMPORTANT. Ensure all components, fasteners, and thumbscrews are securely in place after the equipment is s
47) Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replace
48B. Removal and Replacement of CompressorIMPORTANTAlways install a new drier every time the sealed refrigeration system is opened. Do not replace the
49C. Removal and Replacement of Expansion ValveIMPORTANTSometimes moisture in the refrigeration circuit exceeds the drier capacity andfreezes up at th
5I. SpecicationsA. Icemaker1. DCM-750BAHNote: We reserve the right to make changes in specications and design without prior notice.AC SUPPLY VOLTAGE
50Fig. 1Extruding Head and Upper BearingEvaporatorAllen Head Cap Screw with Washer Allen Head Cap ScrewHousing and Lower BearingGear MotorBarrier/Capa
51. Upper Bearing Wear Check To ensure that the bearing inside the extruding head does not exceed the wear tolerance of .0", follow the instruc
58) Replace spout A, spout B, and the front cover of the storage bin in their correct positions.9) Move the power switch to the "ON" positi
533) Remove the apron panel, then remove the left side panel.4) Recover the refrigerant and store it in an approved container.5) Disconnect the drip t
545. Removal and Replacement of Mechanical Seal and Lower Housing 5a. Mechanical Seal) Move the control switch to the "DRAIN" position and
558) Move the power switch to the "ON" position, then replace the panels in their correct positions.9) Turn on the power supply, then mov
56E. Removal and Replacement of Self-Contained Air-Cooled CondenserIMPORTANTAlways install a new drier every time the sealed refrigeration system is o
57F. Removal and Replacement of Water-Cooled CondenserIMPORTANTAlways install a new drier every time the sealed refrigeration system is opened. Do not
58G. Removal and Replacement of Water Regulating Valve - Water-Cooled Model OnlyIMPORTANTAlways install a new drier every time the sealed refrigeratio
590) Move the power switch to the "ON" position, then replace the panels in their correct positions.) Turn on the power supply, then move
62. DCM-750BAH-OSNote: We reserve the right to make changes in specications and design without prior notice.AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 120
60J. Removal and Replacement of Inlet or Dispensing Water Valve) Close the water supply line shut-off valve.) Open the water supply line drain valve
60) Open the water supply line shut-off valve.) Turn on the power supply, move the power switch to the "ON" position, then replace the f
66) Install the new motor.7) Assemble the removed parts in the reverse order of which they were removed.8) Move the power switch to the "ON"
63VI. Cleaning and MaintenanceIMPORTANTEnsure all components, fasteners, and thumbscrews are securely in place after any cleaning or maintenance is do
641. Water Systema) Cleaning SolutionDilute 9.6 . oz. (0.9 l) of recommended cleaner, Hoshizaki "Scale Away" or "LIME-A-WAY" (Ec
653) Move the control switch to the "OFF" position, then turn off the power supply.4) Close the water supply line shut-off valve.c) Saniti
663) Remove the front cover of the storage bin.4) Remove the motor bracket thumbscrews, rst from the vertical plane and then from the horizontal plan
67B. MaintenanceThis icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. The schedule
68C. Preparing the Icemaker for Long StorageCAUTIONWhen the icemaker is not used for two or three days under normal conditions, it is sufcient to onl
692. On water-cooled model only, remove the water from the water-cooled condenser:) Make sure the control switch and the power switch are in the &quo
7Note: We reserve the right to make changes in specications and design without prior notice.3. DCM-750BWHAC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 120 V
84. DCM-750BWH-OSNote: We reserve the right to make changes in specications and design without prior notice.AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 120
9II. General InformationA. Construction1. DCM-750BAH(-OS)Storage BinInlet Water ValveReservoirControl BoxAir-Cooled CondenserSpout CoverEvaporator Ass
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