Hoshizaki DCM-300BAH Service Manual
  1. Manuals
  2. Brands
  3. Hoshizaki Manuals
  4. Ice Maker
  5. DCM-300BAH
  6. Service manual

Hoshizaki DCM-300BAH Service Manual

Hide thumbs Also See for DCM-300BAH:
Table of Contents

Advertisement

Quick Links

Service Manual
Cubelet Icemaker/Dispenser
Models
DCM-300BAH(-OS)
DCM-500BAH(-OS), BWH(-OS)
DCM-751BAH(-OS), BWH(-OS)
DCM-752BAH(-OS)
hoshizakiamerica.com
Number: 73209
Issued: 8-3-2020

Advertisement

Table of Contents
loading

Related Manuals for Hoshizaki DCM-300BAH

Summary of Contents for Hoshizaki DCM-300BAH

  • Page 1 Service Manual Cubelet Icemaker/Dispenser Models DCM-300BAH(-OS) DCM-500BAH(-OS), BWH(-OS) DCM-751BAH(-OS), BWH(-OS) DCM-752BAH(-OS) hoshizakiamerica.com Number: 73209 Issued: 8-3-2020...
  • Page 2 Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, send an e-mail message, or write to the Hoshizaki Technical Support Department for assistance. Phone: 1-800-233-1940; (770) 487-2331 Fax: 1-800-843-1056;...

  • Page 3: Table Of Contents

    IMPORTANT This manual should be read carefully before the appliance is serviced. Read the warnings and guidelines contained in this manual carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this manual for any further reference that may be necessary. CONTENTS Important Safety Information ....................
  • Page 4 VIII. Technical Information ....................58 A. Specification & Performance Data Sheets ..............58 1. DCM-300BAH(-OS) ....................58 2. DCM-500BAH(-OS) ....................59 3. DCM-500BWH(-OS) ....................60 4. DCM-751BAH(-OS) ....................61 5. DCM-751BWH(-OS) ....................62 6. DCM-752BAH(-OS) ....................63 B. Wiring Diagrams ......................64 1.

  • Page 5: Important Safety Information

    Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property. WARNING Indicates a hazardous situation which could result in death or serious injury.
  • Page 6 WARNING, continued • Children should be properly supervised around the appliance. • Do not climb, stand, or hang on the appliance or allow children or animals to do so. Serious injury could occur or the appliance could be damaged. • Do not use combustible spray or place volatile or flammable substances near the appliance.

  • Page 7: Construction And Water/Refrigeration Circuit Diagrams

    I. Construction and Water/Refrigeration Circuit Diagrams A. Construction Spout B Storage Bin 1. Air-Cooled Models Bin Control Proximity Switch Bin Control Actuator Control Box Agitator (L) Power Switch DCM-751/752BAH(-OS) Storage Bin Cover Agitator (R) Agitating Motor (L) Dispense Auger DCM-751/752BAH(-OS) Agitating Motor (R) Control Switch 4A1038-014...

  • Page 8: Water-Cooled Models

    2. Water-Cooled Models Spout B Storage Bin Bin Control Proximity Switch Control Box Bin Control Actuator Agitator (L) Power Switch DCM-751/752BWH(-OS) Agitator (R) Storage Bin Cover Dispense Auger Agitating Motor (L) DCM-751/752BWH(-OS) Agitating Motor (R) Control Switch 4A1038-014 CONTROL Ice Dispense Motor DISPENSE MODE PORTION DRAIN...

  • Page 9: Icemaking Unit

    B. Icemaking Unit Cubelet Cutter Extruding Head and Upper Bearing Seal Bolt Washer Evaporator Heater DCM-500B_H(-OS) Auger DCM-751/752B_H(-OS) Cylinder Evaporator Insulation Mechanical Seal O-Ring Socket Head Cap Spline Coupling Screw with Washer Housing and Lower Bearing Hex Head Bolt with Washer Gear Motor...

  • Page 10: Water/Refrigeration Circuit Diagrams

    C. Water/Refrigeration Circuit Diagrams 1. Air-Cooled Models Evaporator Heater Spout DCM-500BAH(-OS) DCM-751/752BAH(-OS) Inlet Water Valve Float Switch Water Supply Water Level Reservoir Evaporator Overflow Drier Thermostatic Expansion Valve To Drain Drain Valve Gear Motor Dispense Water Valve Air-Cooled Condenser High-Pressure Switch Compressor Refrigeration Circuit Water Circuit...

  • Page 11: Water-Cooled Models

    2. Water-Cooled Models Spout Evaporator Heater DCM-500BWH(-OS) DCM-751/752BWH(-OS) Inlet Water Valve Water Supply Float Switch Water Level Reservoir Evaporator Overflow Drier Thermostatic Expansion Valve To Drain Drain Valve Gear Motor Dispense Water Valve Water In Water Out Water-Cooled Condenser Water Regulating Valve High-Pressure Switch Compressor...

  • Page 12: Sequence Of Operation And Service Diagnosis

    II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow Chart...

  • Page 13: Service Diagnosis

    B. Service Diagnosis WARNING • The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Risk of electric shock. Use extreme caution and exercise safe electrical practices. •...
  • Page 14 2. Diagnostic Procedure This diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, proper voltage per appliance nameplate, and adequate water supply (10 PSIG to 113 PSIG). Check that both the 24VAC circuit fuse and the 115VAC GM fuse are good.
  • Page 15 7) Startup–"POWER OK" LED is on: Move the power switch to the "ON" position, then move the control switch to the "ICE" position. CB "POWER OK" LED is on. IMPORTANT! Appliance will not start unless the safety switch is engaged. "POWER OK" LED Diagnosis: Check that CB "POWER" LED is on. If not, check for proper power supply voltage (115VAC) input to CT.
  • Page 16 9) Ice Purge Cycle – "GM" LED is on. 5-sec. GM delay timer and 30-min. freeze timer start. WV de-energizes and "WTRIN" LED turns off. Once the 5-sec. GM delay timer terminates, GM, CCR, and EH (if applicable) energize. CCR cannot energize unless GM circuit is complete (GM external protector and GM internal protector).
  • Page 17 11) Refill Cycle/Low Water Safety – As ice is produced, the water level in the reservoir drops. UFS opens. Nothing occurs at this time. When LFS opens, WV energizes, 90-sec. low water safety timer (fill timer) starts. Comp, GM, CCR, and FM continue. When UFS closes, WV de-energizes, 90-sec.

  • Page 18: Control Board Check

    C. Control Board Check Before replacing a CB that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. Before proceeding, check for proper voltage per appliance nameplate. Check that the 24VAC 1A fuse is good and 115VAC 2A (DCM-300/500) or 3A (DCM-751/752) GM external protector is closed.
  • Page 19 • "DRAIN" Position: When control switch is in the "DRAIN" position, CB K9 pin #1 (W/BK) and pin #2 (W/BK) are closed. 0VDC is present between CB K9 pin #1 (W/BK) and CB K9 pin #2 (W/BK). If 5VDC is present, check control switch position and continuity.
  • Page 20 2b) 5VDC CB K8 Connector: See Fig. 2. a) Bin Control (BC) CB K8 pin #3 (GY) and #4 (GY): When BC is closed (icemaking), 5VDC is present between CB K8 pin #3 (GY) and pin #4 (GY) to CB K4 pin #1 (pin closest to CB black K3).
  • Page 21 2c) 5VDC CB K7 Connector: See Figs. 3, 4, 5, and 6. a) Water Dispense Switch/Water Dispense Sensor 1. Push Button Model CB K7 pin #3 (BR) or (W/BK) and pin #8 (DBU) or (P): Before engaging the water dispense switch, check for the correct VDC from the locations given in the "Disengaged"...
  • Page 22 2. Opti-Serve Model CB K7 connector pins #7 (R), #8 (P) or (W), and #9 (BK) or (P):Before engaging the water dispense Opti-Serve sensor, check for the correct VDC from the locations given in the "Disengaged" column in the table below. If the VDC is different than in the table, replace CB.
  • Page 23 b) Ice Dispense 1. Push Button Model CB K7 connector pins #2 (Y) and #3 (W/BK) or (BR): Before engaging the ice dispense switch, check for the correct VDC from the locations given in the "Disengaged" column in the table below. If the VDC is different than in the table, replace CB.
  • Page 24 2. Opti-Serve Model CB K7 connector pins #1 (W/R) or (P), #2 (W) or (Y), #3 (W/BK), and #5 (DBU) or (W/O): Before engaging the ice dispense Opti-Serve sensor, check for the correct VDC from the locations given in the "Disengaged" column in the table below. If the VDC is different than in the table, replace CB.
  • Page 25 3) Fill Cycle–"WTRIN" LED is on: "WTRIN" LED turns on only when the reservoir water level is low enough to open LFS. Diagnosis: Confirm LFS is open. If "WTRIN" LED is off and LFS is open and the control switch is in the "ICE" position (open), replace CB.

  • Page 26: Bin Control Check

    D. Bin Control Check When the actuator paddle is not engaged, BC circuit (CB K8 #3 (GY) and CB K8 #4 (GY)) is closed and the appliance produces ice. When ice fills the chute and engages the actuator paddle, BC opens. NOTICE! Do not place S1 dip switch 7 or S1 dip switch 8 out of the factory default position.
  • Page 27 15) When Comp starts, press and hold BC actuator paddle. 16) a. 2A4296-01: Dip Switch 8 "ON": Comp and GM should de-energize within 10 seconds. b. 2A8054-01 and 2A9093-01 dip switch 8 and 9 "ON": Once dip switch 8 bin control delay timer (6 to 10 sec.) terminates, 90-sec.

  • Page 28: Float Switch Check And Cleaning

    4) Turn off the power supply. 5) Remove FS assembly from the reservoir cover. See Fig. 8. 6) Wipe down FS assembly with a mixture of 1 part Hoshizaki Scale Away and 25 parts warm water. Rinse the FS assembly thoroughly with clean water.
  • Page 29 Red (R) (upper float switch) Black (BK) (common) Blue (BU) or Dark Blue (DBU) (lower float switch) Magnet (towards top) Upper Float (blue) Spring Retainer Clip Magnet (towards top) Lower Float (white) Plastic Retainer Clip Fig. 7 Float Switch Assembly Reservoir Cover Reservoir Fig.

  • Page 30: Diagnostic Tables

    F. Diagnostic Tables Before consulting the diagnostic tables, check for correct installation, proper voltage per appliance nameplate, and adequate water pressure (10 to 113 PSIG). Check control board using the steps in "II.C. Control Board Check." 1. No Ice Production No Ice Production - Possible Cause Startup 1.
  • Page 31 No Ice Production - Possible Cause Ice Purge Cycle 1. Control Board a) No power to gear motor. b) No power to compressor control relay circuit (5VDC) or not reading circuit. 2. Gear Motor a) 2A (DCM-300/500B_H(-OS)) or 3A (DCM-751/752B_H(-OS)) fuse blown. b) Internal protector open.
  • Page 32 No Ice Production - Possible Cause Refill 1. Water Supply a) Off. 2. Control Board a) No power to float switch (5VDC) or not reading float switch condition. b) No power to inlet water valve (24VAC). 3. Float Switch a) Float does not move freely. b) Defective.
  • Page 33 Water Dispense-Push Button 1. Power Supply a) Off, blown fuse, or tripped breaker. 2. Control Board a) No power from control board to water dispense switch (5VDC) or not reading signal. b) No power to water dispense valve (24VAC). 3. Water Dispense Switch a) Defective.

  • Page 34: Controls And Adjustments

    III. Controls and Adjustments • A Hoshizaki exclusive control board is employed in DCM series appliances. • All models are pretested and factory adjusted. • For a control board check procedure, see "II.C. Control Board Check." NOTICE • The control board is fragile; handle very carefully.

  • Page 35: Control Board Layout

    A. Control Board Layout 1. Control Board Layout (Push Button) High-Pressure Switch #3 (Y) to #4 (Y) Compressor Control Relay Circuit Open-5VDC #5 (W/O) to #6 (W/O) Control Switch Closed-0VDC Relay De-Energized-Open-5VDC #1 (W/BK) to #2 (W/BK) Relay Energized-Closed-0VDC "ICE"-Open-5VDC •...
  • Page 36 2. Control Board Layout (Opti-Serv) High-Pressure Switch #3 (Y) to #4 (Y) Compressor Control Relay Circuit Open-5VDC #5 (W/O) to #6 (W/O) Closed-0VDC Relay De-Energized-Open-5VDC Control Switch Relay Energized-Closed-0VDC #1 (W/BK) to #2 (W/BK) "ICE"-Open-5VDC • K9 Connector "DRAIN"-Closed-0VDC • "SERVICE"...

  • Page 37: Led Lights And Audible Alarm Safeties

    B. LED Lights and Audible Alarm Safeties The "POWER OK" LED indicates proper control voltage and will remain on unless a control voltage problem occurs. For further details, see "II.B. Service Diagnosis." Icemaking Sequence Energized Sequence Step Components Min. Max. Fill Cycle WTRIN Ice Purge Cycle GM...

  • Page 38: Controls And Adjustments

    C. Controls and Adjustments NOTICE Dip switches are factory set. Failure to maintain factory settings may adversely affect performance and warranty coverage. For more information, contact Hoshizaki Technical Support at 1-800-233-1940. 1. Default Dip Switch Settings The S1 dip switch settings are factory-set to the following positions: Dip Switch No.

  • Page 39: Continuous Dispensing Timer (S1 Dip Switch 5 & 6)

    4. Continuous Dispensing Timer (S1 dip switch 5 & 6) The dispense mode switch must be in the "CONTINUOUS" position for this setting to apply. The factory setting allows ice to be dispensed continuously for 20 sec. on push button models and for a maximum of 60-sec. on Opti-Serve models. NOTICE! On Opti-Serve models, do not adjust S1 dip switch 5 &...

  • Page 40: Bin Control Shutdown Delay, Agitation, And Ice Purge Timer (S1 Dip Switch 8)

    6. Bin Control Shutdown Delay, Agitation, and Ice Purge Timer (S1 dip switch 8) Only available when S1 dip switch 7 is in the "OFF" position. Factory set for normal operation. No adjustment is required. The shutdown delay is the time between the bin control proximity switch opening and the control board shutting down the appliance or starting the S1 dip switch 9 bin control shutdown timer (2A8054-01 and 2A9093-01 only).

  • Page 41: Switches

    D. Switches The power switch, control switch, and dispense mode switch are used to control the operation of the appliance. 1. Power Switch WARNING! The power switch does not turn off all power supply to the unit. 115VAC power supply is present on control board K1 connector pin #2 (BR) and control board X1 relay (BR) when the power switch is in the "OFF"...
  • Page 42 3. Dispense Mode Switch The dispense mode switch has 2 positions, "CONTINUOUS" and "PORTION." See Fig. 12. a) CONTINUOUS When the dispense mode switch is in the "CONTINUOUS" position, ice dispenses as follows: Push Button: Ice dispenses continuously with button engaged. OS: Ice dispenses for a maximum of 60 seconds per activation.

  • Page 43: Refrigeration Circuit And Component Service Information

    IV. Refrigeration Circuit and Component Service Information WARNING • This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Move the power switch to the "OFF" position, then unplug the appliance from the electrical outlet before servicing.
  • Page 44 2. Brazing WARNING • R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). • R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous.
  • Page 45 Remember to loosen the connection and purge the air from the hose. See the rating label inside the icemaker for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets AHRI Standard 700 (latest edition) be used.

  • Page 46: Component Service Information

    B. Component Service Information NOTICE • When replacing a component listed below, see the notes to help ensure proper operation. • When replacing evaporator assembly and water circuit components, make sure there are no water leaks after the repair is complete. •...
  • Page 47 Evaporator Assembly Evaporator Assembly Spout A Left Side Panel Spout B Power Switch Right Side Panel Storage Bin Cover Cutter Extruding Head and Upper Bearing Control Switch Auger 4A1038-014 CONTROL Evaporator Heater DCM-500B_H(-OS) DISPENSE MODE Safety Switch DCM-751B_H(-OS) PORTION Apron Panel DRAIN CONTINUOUS DCM-752BAH(-OS)

  • Page 48: Icemaking Unit

    C. Icemaking Unit 1. Upper Bearing Wear Check To ensure that the bearing inside the extruding head does not exceed the wear tolerance of .02", follow the instructions below. See Fig. 15. 1) Move the control switch to the "OFF" position, then turn off the power supply. Remove the front and top panels, then move the power switch to the "OFF"...
  • Page 49 2. Removal and Replacement of Extruding Head 1) Move the control switch to the "DRAIN" position and drain all of the water from the evaporator. 2) After the water has stopped draining, move the control switch to the "OFF" position, then turn off the power supply.
  • Page 50 4. Removal and Replacement of Evaporator NOTICE • Always install a new drier every time the sealed refrigeration system is opened. • Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.
  • Page 51 16) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 17) Install the new auger assembly with the upper part of the mechanical seal attached. Secure the auger assembly using new allen head cap screws. Replace the evaporator heater (if applicable).
  • Page 52 12) Install the lower part of the mechanical seal on the lower housing. 13) Lower the evaporator down and secure it to the lower housing. 14) Install the auger assembly with the upper part of the mechanical seal attached. Secure the auger assembly using new allen head cap screws.

  • Page 53: Dispense Components

    D. Dispense Components 1. Dispense Auger and Agitator 1) Move the control switch to the "OFF" position, then turn off the power supply. Remove the front and top panels, then move the power switch to the "OFF" position. 2) Remove the storage bin cover. 3) Remove the thumbscrews from the vertical plane, then loosen the thumbscrews from the horizontal plane of the motor bracket.

  • Page 54: Maintenance

    V. Maintenance The maintenance schedule below is a guideline. More frequent maintenance may be required depending on water quality, the appliance's environment, and local sanitation regulations. WARNING • Only qualified service technicians should service the appliance. • Move the control switch and power switch to the "OFF" positions, then turn off the power supply before servicing.

  • Page 55: Preparing The Appliance For Periods Of Non-Use

    VI. Preparing the Appliance for Periods of Non-Use NOTICE When storing the appliance for an extended time or in sub-freezing temperatures, follow the instructions below to prevent damage. When the appliance is not used for two or three days under normal conditions, it is sufficient to only move the control switch to the "OFF"...
  • Page 56 2. On water-cooled model only, remove the water from the water-cooled condenser: 1) Make sure the control switch and the power switch are in the "OFF" position and that the power supply is off. Remove the top, apron, and left side panels. 2) Close the condenser water supply line shut-off valve.

  • Page 57: Disposal

    VII. Disposal The appliance contains refrigerant and must be disposed of in accordance with applicable national, state, and local codes and regulations. Refrigerant must be recovered by properly certified service personnel.

  • Page 58: Technical Information

    We reserve the right to make changes in specifications and design without prior notice. A. Specification & Performance Data Sheets Note: The data not in bold should be used for reference only. 1. DCM-300BAH(-OS) Specification Sheet AC SUPPLY VOLTAGE 115-120/60/1...

  • Page 59: Dcm-500Bah(-Os)

    2. DCM-500BAH(-OS) Specification Sheet AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 120 V 7.5 RLA 54.5 LRA GEAR MOTOR 120 V 2.4 FLA 1/4 HP FAN MOTOR 120 V 1.0 FLA 50 W AGITATING MOTOR 120 V 0.9 FLA 55 W DISPENSING MOTOR 120 V 0.9 FLA 55 W...

  • Page 60: Dcm-500Bwh(-Os)

    3. DCM-500BWH(-OS) Specification Sheet AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 115 V 7.8 RLA 54.5 LRA GEAR MOTOR 115 V 2.4 FLA 1/4 HP AGITATING MOTOR 115 V 0.9 FLA 55 W DISPENSING MOTOR 115 V 0.9 FLA 55 W OTHER 120 V 0.6 A MAXIMUM FUSE SIZE...

  • Page 61: Dcm-751Bah(-Os)

    4. DCM-751BAH(-OS) Specification Sheet AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 115 V 77 LRA 11.0 RLA GEAR MOTOR 115 V 3.0 FLA 1/4 HP FAN MOTOR 115 V 1.0 FLA 50 W AGITATING MOTOR 120 V 1.8 FLA (TOTAL) 110 W (TOTAL) DISPENSING MOTOR 115 V 0.9 FLA...

  • Page 62: Dcm-751Bwh(-Os)

    5. DCM-751BWH(-OS) Specification Sheet AC SUPPLY VOLTAGE 115/60/1 COMPRESSOR 115 V 77 LRA 11.0 RLA GEAR MOTOR 115 V 3.0 FLA 200W AGITATING MOTOR 120 V 3.2 FLA (TOTAL) 134 W (TOTAL) DISPENSING MOTOR 115 V 1.1 FLA 53 W OTHER 115 V 0.6 A...

  • Page 63: Dcm-752Bah(-Os)

    6. DCM-752BAH(-OS) Specification Sheet 115/60/1 AC SUPPLY VOLTAGE 13 A AMPERAGE 20 A MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F 1159 (3.93) ELECTRIC W (kWH/100 lbs.) 1208 (5.10) 85 (12.0) POTABLE WATER 69 (12.0) gal./24HR (gal./100 lbs.) BIN CONTROL SYSTEM Mechanical Bin Control...

  • Page 64: Wiring Diagrams

    B. Wiring Diagrams 1. DCM-300BAH(-OS) * High Pressure Switch Air-Cooled Model 412± PSIG Cut-out Cut-in 327±21 PSIG...

  • Page 65: Dcm-500B_H

    2. DCM-500B_H * High Pressure Switch Air-Cooled Model Water-Cooled Model 412± PSIG 384± PSIG Cut-out Cut-in 327±21 PSIG 284±21 PSIG...

  • Page 66: Dcm-500B_H-Os

    3. DCM-500B_H-OS * High Pressure Switch Air-Cooled Model Water-Cooled Model 412± PSIG 384± PSIG Cut-out Cut-in 327±21 PSIG 284±21 PSIG...

  • Page 67: Dcm-751B_H

    4. DCM-751B_H EVAPORATOR HEATER COMPRESSOR CONTROL RELAY * High Pressure Switch Air-Cooled Model Water-Cooled Model 412± PSIG 384± PSIG Cut-out 327±21 PSIG 284±21 PSIG Cut-in...

  • Page 68: Dcm-751B_H-Os

    5. DCM-751B_H-OS EVAPORATOR HEATER COMPRESSOR CONTROL RELAY * High Pressure Switch Air-Cooled Model Water-Cooled Model Cut-out 412± PSIG 384± PSIG Cut-in 327±21 PSIG 284±21 PSIG...

  • Page 69: Dcm-752Bah(-Os)

    6. DCM-752BAH(-OS) * High Pressure Switch Air-Cooled Model 412± PSIG Cut-out 327±21 PSIG Cut-in...

This manual is also suitable for:

Dcm-300bah-osDcm-500bahDcm-500bah-osDcm-500bwhDcm-500bwh-osDcm-751bwh ... Show all

Table of Contents