Hoshizaki DCM-270BAH-OS Service Manual
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Hoshizaki DCM-270BAH-OS Service Manual

Cubelet icemaker/dispenser
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See also: Instruction Manual , Manual
Service Manual
Cubelet Icemaker/Dispenser
Models
DCM-270BAH(-OS)
Control Board
hoshizakiamerica.com
Number: 73202
Issued: 5-6-2014
Revised: 11-18-2019

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Summary of Contents for Hoshizaki DCM-270BAH-OS

  • Page 1 Service Manual Cubelet Icemaker/Dispenser Models DCM-270BAH(-OS) Control Board Number: 73202 hoshizakiamerica.com Issued: 5-6-2014 Revised: 11-18-2019...
  • 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

    VIII. Technical Information ....................50 A. Specification and Performance Data Sheets ............... 50 1. DCM-270BAH ......................50 2. DCM-270BAH-OS ....................51 B. Wiring Diagrams ......................52 1. DCM-270BAH(-OS): ....................52 Serial Number: C10508L to D00829A (except C17634M and C17641M) ..... 52 2.

  • 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-270BAH(-OS) Top Panel Bin Control Switch Bin Top Cover Compressor Ice Storage Bin DCM-270BAH-OS Shutter Inlet Water Valve Front Panel Assembly Right Side Panel Control Box B Power Switch Reservoir...

  • Page 7: Water/Refrigeration Circuit Diagrams

    B. Water/Refrigeration Circuit Diagrams DCM-270BAH(-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 4) After all of the water has drained, move control switch to the "ICE" position. 5) Fill Cycle – "WTRIN" LED is on. WV energizes. The 90-sec. low water safety timer begins. LFS closes. Nothing occurs at this time. The reservoir continues to fill until UFS closes, terminating the 90-sec.
  • Page 12 7) Freeze Cycle – "COMP" LED is on. ice purge timer terminates (1-min. or 5-min.) or the "SERVICE" button is pressed. "COMP" LED turns on. "GM" LED remains on. Comp and FM energize. GM and CCR continue. Ice production begins 4 to 6 minutes after Comp energizes depending on ambient and water conditions.
  • Page 13 9) Shutdown a) 2A4296-01: E-0 (H) and Earlier Dip Switch 8 "ON" CB Shutdown – Bin fills with ice activating BC micro-switch. Within 6 to 10 sec. CB shuts down appliance. b) 2A4296-01: E-0 (H) and Later Dip Switch 8 "OFF" CB Shutdown – Bin fills with ice activating BC micro-switch.

  • Page 14: 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 15 • "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 16 2b) 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 17 2c) 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 (Y) or (P): "WTRDP" LED is on: Before engaging the water dispense switch, check for the correct VDC from the locations given in the "Disengaged"...
  • Page 18 2. Opti-Serve Model CB K7 connector pins #7 (R), #8 (Y) or (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 19 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 20 2. Opti-Serve Model CB K7 connector pins #1 (W/R), #2 (Y), and #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 21 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 22: 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 23 12) When Comp starts, press and hold BC large balance plate. 13) a. 2A4296-01: E-0 (G) and Earlier Dip Switch 8 "ON": Comp and GM should de-energize within 10 seconds. b. 2A4296-01 E-0 (H) and Later Dip Switch 8 "OFF": 90-sec. Comp shutdown timer starts.

  • 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. 2. Gear Motor a) 3A external protector tripped. b) Internal protector open. c) Motor winding. d) Mechanical failure. 3. Coupling a) Defective. 4.
  • 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 water dispense switch (5VDC) or not reading signal. b) No power to dispense water valve (24VAC). 3. Water Dispense Switch a) Defective.

  • 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-270BAH 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 • "DRAIN"-Closed-0VDC K9 Connector •...
  • Page 32 2. DCM-270BAH-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 33: 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 34: 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-270BAH-OS) Drain Frequency Control Bin Control Shutdown Delay (infrared sensor) 2. Bin Control Shutdown Delay (Infrared Sensor) (S1 dip switch 1, 2, 3) NOTICE Do not adjust.

  • Page 35: Continuous Dispensing Timer (S1 Dip Switch 5 & 6)

    The factory setting allows ice to be dispensed continuously for 20 sec. The DCM-270BAH may be adjusted to other dispense time options. NOTICE! On DCM-270BAH-OS, do not adjust S1 dip switch 5 & 6 out of the factory default position.

  • Page 36: Bin Control Shutdown Delay (S1 Dip Switch 9)

    7. Bin Control Shutdown Delay (S1 dip switch 9) 2A8084-01 and 2A9093-01 Only. Only available when S1 dip switch 7 is in the "OFF" position. Factory set for optimum performance. Do not adjust. Dip switch 9 shutdown timing starts when Dip Switch 8 Bin Control Shutdown Delay timer terminates. WARNING! Do not adjust S1 dip switch 9 out of the factory default position.

  • Page 37: 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 38 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 39 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 40: 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 41 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) Spline Coupling Gear Motor Socket Head Cap Screw Fig. 10...

  • Page 42: 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 43 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 44 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 45 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 46 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 47: 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 48: 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 49: 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 50: 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 51: Dcm-270Bah-Os

    2. DCM-270BAH-OS SPECIFICATION SHEET AC SUPPLY VOLTAGE 115/60/1 AMPERAGE 8.5 A [AT 104°F(40°C)/WT 80°F(27°C)] MAXIMUM FUSE SIZE MINIMUM CIRCUIT AMPACITY ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 669 (8.16) 638 (5.3) WATER gal./24HR (gal./100 lbs.) 26 (12)

  • Page 52: Wiring Diagrams

    DRAIN W/BK DRAIN CONTROL SWITCH W/BK WIRE COLOR CODE BK -BLACK HI-PRESS. BR -BROWN SWITCH BU -BLUE DBU -DARK BLUE DCM-270BAH-OS GR -GREEN W/BK BU R BK GY -GRAY LBU -LIGHT BLUE (BK) WATER (BU) -ORANGE DISPENSE (BK) W/BK -PINK...

  • Page 53: Dcm-270Bah(-Os)

    2. DCM-270BAH(-OS): Serial Number: C17634M, C17641M, and D00998A and Later WIRE COLOR CODE BK -BLACK BR -BROWN BU -BLUE DBU -DARK BLUE GR -GREEN GY -GRAY LBU -LIGHT BLUE -ORANGE -PINK -RED -VIOLET -WHITE -YELLOW W/BK -WHITE BLACK W/BR -WHITE BROWN W/BU -WHITE BLUE W/O -WHITE ORANGE W/R -WHITE RED...

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Dcm-270bah

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