Hoshizaki DCM-271BAH-OS Service Manual
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Hoshizaki DCM-271BAH-OS Service Manual

Cubelet icemaker/dispenser
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Service Manual
Cubelet Icemaker/Dispenser
Models
DCM-271BAH(-OS)
hoshizakiamerica.com
Number: 73242
Issued: 12-15-2020
Revised: 7-16-2021

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Summary of Contents for Hoshizaki DCM-271BAH-OS

  • Page 1 Service Manual Cubelet Icemaker/Dispenser Models DCM-271BAH(-OS) Number: 73242 hoshizakiamerica.com Issued: 12-15-2020 Revised: 7-16-2021...
  • 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

    VI. Preparing the Appliance for Periods of Non-Use ............49 VII. Disposal ......................... 50 VIII. Technical Information ....................51 A. Specification and Performance Data Sheets ............... 51 1. DCM-271BAH ......................51 2. DCM-271BAH-OS ....................52 B. Wiring Diagram ......................53...

  • Page 4: 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 5 WARNING, continued • Do not make any alterations to the appliance. Alterations could result in electric shock, injury, fire, or damage to the appliance. • Do not place fingers or any other objects into the ice discharge opening. • The appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.

  • Page 6: Construction And Water Refrigeration Circuit Diagrams

    I. Construction and Water Refrigeration Circuit Diagrams A. Construction 1. DCM-271BAH(-OS) Top Panel Bin Control Switch DCM-271BAH DCM-271BAH-OS Bin Top Cover Front Panel Assembly Front Panel Assembly Compressor Ice Storage Bin Inlet Water Valve Shutter Assembly Power Switch Control Box B...

  • Page 7: Water/Refrigeration Circuit Diagrams

    B. Water/Refrigeration Circuit Diagrams DCM-271BAH(-OS) Bin Top Cover Agitator Inlet Water Valve Water Reservoir Supply Water Level Float Switch Bin Drain Thermostatic Hose Evaporator Expansion Valve Overflow Evaporator Water Supply Hose To Drain Drain Valve To Drain Gear Motor Dispense Water Valve Drier High-Pressure Switch Air-Cooled Condenser...

  • Page 8: Sequence Of Operation And Service Diagnosis

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

  • Page 9: 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 10 2. Diagnostic Procedure The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, adequate water pressure (10 to 113 PSIG), and proper voltage per unit nameplate. Note: • When checking high voltage (115VAC), always choose a neutral (W) wire to establish a good neutral connection.
  • Page 11 5) Startup–CB "POWER OK" LED is on. Turn on the power supply, then move the power switch to the "ON" position. CB "POWER OK" LED and IS green LED turn on. Diagnosis CB "POWER OK" LED: Check that CB "POWER OK" LED is on. If not, check for 115VAC at control transformer black (BK) wire to neutral (W).
  • Page 12 7) Ice Purge Cycle – "GM" LED is on. 5-sec. GM delay timer terminates. GM, FM, and CCR energize. Once CCR energizes, 5VDC circuit closes through CCR terminal #3 (W/O) and terminal #5 (W/O) and CB K9 #5 (W/O) and K9 #6 (W/O). After 5VDC circuit closes, 5-min.
  • Page 13 Icemaker Diagnosis (CCR): 5-min. ice purge timer terminates, CB "COMP" LED turns on and COMP energizes. If not, check for 5VDC between CB K4 connector pin closest to CB K3 connector and CB K9 connector #5 (W/O). If 5VDC is not present, replace CB.
  • Page 14 10) Drain Cycle a) 1-n-1 Drain Cycle: DV energizes once every hour when the 1-in-1 drain cycle is activated (S1 dip switch 4 in the "OFF" position (factory default position)). GM, FM, and Comp continue. DV energizes for 2 sec. every hour. This setting is recommended for optimum icemaker performance.

  • Page 15: 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 3A GM external protector is closed.
  • Page 16 • "DRAIN" Position: When control switch is in the "DRAIN" position, CB K9 connector pin #1 (W/BK) and pin #2 (W/BK) are closed. 0VDC is present between pin #1 (W/BK) and pin #2 (W/BK). If not, check control switch position and continuity. Next, confirm 5VDC is present between both CB K9 connector pin #1 (W/BK) and pin #2 to CB red K4 connector, pin closest to CB black K3 connector.
  • Page 17 (2) 5VDC CB K8 Connector: See Fig. 2. a) Bin Control (BC) CB K8 pin #3 (GY) and pin #4 (GY): When BC is closed (icemaking), 5VDC is present between CB K8 pin #3 (GY) and pin #4 (GY) to CB red K4 pin #1 (pin closest to CB black K3).
  • Page 18 (3) 5VDC CB K7 Connector: See Figs. 3, 4, 5, and 6. a) Water Dispense 1. Push Button Model CB K7 pin #3 (W/BK) and pin #8 (P): "WTRDP" LED is on: Before engaging the water dispense switch, check for the correct VDC from the locations given in the "Disengaged"...
  • Page 19 2. Opti-Serve Model CB K8 connector pins #7 (R), #8 (P), and #9 (BK): Before engaging the water dispense OS 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 20 b) Ice Dispense 1. Push Button Model CB K7 connector pins #2 (Y) and #3 (W/BK): "ICE" and "AM" LEDs are on: 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 21 2. Opti-Serve Model CB K8 pin #1 (W/R), pin #2 (Y), and pin #3 (W/BK): Before engaging the ice dispense OS 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 22 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 23: Bin Control Check

    D. Bin Control Check When BC (micro-switch) 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 bin and engages BC large balance plate, BC opens. NOTICE! Do not place S1 dip switch 7 or S1 dip switch 8 out of the factory default position.

  • Page 24: Float Switch Check And Cleaning

    "OFF" position. 3) Remove FS assembly from the reservoir cover. See Fig. 8. 4) 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 25 Red (R) (upper float switch) Black (BK) (common) Blue (BU) (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. 8...

  • Page 26: 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 27 No Ice Production - Possible Cause Ice Purge Cycle 1. Control Board a) No power to gear motor. See "II.C. Control Board Check" 2. Gear Motor a) 3A external protector tripped. b) Internal protector open. c) Motor winding. d) Mechanical failure. 3.
  • Page 28 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 29 Water Dispense-Push Button 1. Power Supply a) Off, blown fuse, or tripped breaker. 2. Control Board a) No power from control board to dispense board (5VDC) or not See "II.C. Control Board Check" reading signal. b) No power to dispense water valve (24VAC). 3.

  • Page 30: Controls And Adjustments

    III. Controls and Adjustments • A Hoshizaki exclusive control board is employed in DCM series appliances. • All models are pre-tested 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 31: Control Board Layout

    A. Control Board Layout 1. DCM-271BAH High-Pressure Switch a) Control Board #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 • "DRAIN"-Closed-0VDC K9 Connector •...

  • Page 32: B) Upper/Lower Water And Ice Dispense Board

    b) Upper/Lower Water and Ice Dispense Board Ice Display LEDs Water Display LEDs LED 5 LED 1 Ice Dispense Switch Water Dispense Switch LED 6 LED 2 5VDC LED Power Common Water Display LEDs Ice Display LEDs Red (R) Wire Black (BK) Wire LED 3 LED 7...
  • Page 33 2. DCM-271BAH-OS 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" Button (Ice Purge Cycle Bypass)

  • Page 34: Led Lights And Audible Alarm Safeties

    B. LED Lights and Audible Alarm Safeties The "POWER" 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 On until UFS closes.

  • Page 35: Settings And Adjustments

    Bin Control Shutdown Delay (mechanical) and Periodic Agitation of Storage Bin Bin Control Selector Continuous Dispensing Timer (Do not adjust on DCM-271BAH-OS) Drain Frequency Control Bin Control Shutdown Delay (infrared sensor) (not used on this model) 2. Bin Control Shutdown Delay (Infrared Sensor) (S1 dip switch 1, 2, 3) NOTICE Do not adjust.

  • Page 36: Continuous Dispensing Timer (S1 Dip Switch 5 & 6)

    The factory setting allows ice to be dispensed continuously for 20 sec. The DCM-271BAH may be adjusted to other dispense time options. NOTICE! On DCM-271BAH-OS, do not adjust S1 dip switch 5 & 6 out of the factory default position.

  • Page 37: Bin Control Shutdown Delay (S1 Dip Switch 9)

    7. Bin Control Shutdown Delay (S1 dip switch 9) The shutdown delay is the time between the bin control micro-switch opening and the control board shutting down the appliance. WARNING! Do not adjust S1 dip switch 9 out of the factory default position. This dip switch must be left in the factory default position or the appliance will not operate correctly.

  • Page 38: 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 39 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 40 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 ARI Standard 700 (latest edition) be used.

  • Page 41: 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 42 Icemaking Unit Cutter/Agitator Extruding Head (Upper Bearing) Drip Ring Auger Cover O-Ring Seal Bolt Storage Bin Evaporator Socket Head Cap Screw Ring Mechanical Seal O-Ring Housing (Lower Bearing) Gear Motor Spline Coupling Socket Head Cap Screw Fig. 8...

  • Page 43: 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. 11. 1) Move the power switch to the "OFF" position, then unplug the appliance from the electrical outlet.
  • Page 44 2a. Removal and Replacement Extruding Head 1) Remove the cutter/agitator by turning it counter-clockwise, then lift the drip ring out of the storage bin. 2) Remove the seal bolts, then lift the extruding head out of the evaporator. 3) Place the new extruding head on the auger. Next, secure the extruding head with new seal bolts and tighten to 11.1 ft-lb/15 N·m.
  • Page 45 2c. 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. 1) Recover the refrigerant and store it in an approved container. 2) Remove the cutter/agitator by turning it counter-clockwise, then lift the drip ring out of the storage bin.
  • Page 46 2d. Removal and Replacement of Mechanical Seal and Lower Housing 1. Mechanical Seal 1) Remove the cutter/agitator by turning it counter-clockwise, then lift the drip ring out of the storage bin. 2) Remove the seal bolts, then screw the cutter/agitator back on to the auger and use it to lift the auger out of the evaporator.
  • Page 47 2e. Removal and Replacement of Gear Motor 1) Remove the bolts securing the lower housing to the gear motor. Lift the evaporator up slightly. 2) Remove the gear motor bolts. 3) Disconnect the wiring from the gear motor, then lift the evaporator up slightly and remove the gear motor.

  • Page 48: 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. • To reduce the risk of electric shock, do not touch the control switch or service switch with damp hands •...

  • Page 49: Preparing The Appliance For Periods Of Non-Use

    VI. Preparing the Appliance for Periods of Non-Use NOTICE When storing the icemaker 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 power switch to the "OFF"...

  • Page 50: Disposal

    VII. Disposal This 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 51: Technical Information

    VIII. Technical Information We reserve the right to make changes in specifications and design without prior notice. A. Specification and Performance Data Sheets Pressure data is recorded at 5 min. into freezing cycle. The data not in bold should be used for reference only. 1.

  • Page 52: Dcm-271Bah-Os

    2. DCM-271BAH-OS Specifications 115/60/1 AC SUPPLY VOLTAGE AMPERAGE 8.5 A [AT 104°F (40°C)/WT 80°F(27°C)] MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE 90/70°F 70/50°F ELECTRIC & WATER CONSUMPTION ELECTRIC W (kWH/100 lbs.) 571 (6.90) 537 (5.02) 23 (12.0) 31 (12.0) POTABLE WATER gal./24HR (gal./100 lbs.)

  • Page 53: Wiring Diagram

    B. Wiring Diagram * High-Pressure Switch Cut-out 412± PSIG Cut-in 327±22 PSIG...

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Dcm-271bah

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