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

Cubelet icemaker/dispenser
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Service Manual
Cubelet Icemaker/Dispenser
Models
DCM-270BAH(-OS)
F-A & F-C Control Boards
hoshizakiamerica.com
Number: 73202
Issued: 5-6-2014
Revised: 5-10-2016

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Summary of Contents for Hoshizaki DCM-271BAH

  • Page 1 Service Manual Cubelet Icemaker/Dispenser Models DCM-270BAH(-OS) F-A & F-C Control Boards Number: 73202 hoshizakiamerica.com Issued: 5-6-2014 Revised: 5-10-2016...
  • 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 booklet carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this booklet for any further reference that may be necessary. CONTENTS Important Safety Information ....................

  • 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 Condenser Control Box A Cover...

  • 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) 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. low water safety timer, starting the 30-min. freeze timer, and de-energizing WV.
  • Page 12 6) Freeze Cycle – "COMP" LED is on. ice purge timer terminates (1-min. "F-A" CB E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB E-0 (G) and earlier dip switch 8 on) or the "SERVICE" button is pressed. "COMP" LED turns on. "GM" LED remains on.
  • Page 13 10) Shutdown a) "F-A" 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 shutsdown appliance. b) "F-A" E-0 (H) and Later Dip Switch 8 "OFF" 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 1) Startup-"POWER OK" LED on: Move control switch to "ICE" position, then move power switch to "ON" position. "POWER OK" LED turns on. "POWER" LED remains on unless power supply is interrupted. Diagnosis: Check that "POWER OK" LED is on. If not, check for proper 115VAC supply voltage to CT (main breaker or fuse and power switch).
  • Page 16 2a) 5VDC CB K9 Connector Continued: a) Control Switch"DRAIN" Position CB K9 connector pins #1 (W/BK) and #2 (W/BK): • "ICE" Position: When the control switch is in the "ICE" position, CB K9 connector pin #1 and pin #2 are open. 5VDC is present between CB K9 connector pin #1 (W/BK) and pin #2 (W/BK).
  • Page 17 2b) 5VDC CB K8 Connector: See Fig. 2. 5VDC CB K8 Connector Component Pin # (Wire Color) Bin Control (BC) #3 (GY) and #4 (GY) Float Switch (FS) Common #5 (BK) Common Upper Float Switch (UFS) #6 (R) Lower Float Switch (LFS) #7 (BU) Multimeter Red positive...
  • Page 18 2c) 5VDC CB K7 Connector: See Figs. 3, 4, 5, and 6. a) Water Dispense 1. Push Button Model CB K7 connector pins #3 (W/BK) and #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 19 2. Opti-Serve Model CB K8 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 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 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 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 13) a. "F-A" CB E-0 (G) and Earlier Dip Switch 8 "ON": Comp and GM should de-energize within 10 seconds. b. "F-A" CB E-0 (H) and Later Dip Switch 8 "OFF": 90-sec. Comp shutdown timer starts. Once 90-sec. Comp shutdown timer terminates, Comp and FM de-energize and 60-sec.

  • Page 25: 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 26 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 27: 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 28 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 29 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 30 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 31: 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 32: 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 33 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) Compressor Relay 115VAC input (BR) 5VDC...

  • 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

    C. Settings and Adjustments 1. Default Dip Switch Settings The S1 dip switch settings are factory-set to the following positions: Control Board & Aux. Dip Switch No. Code Revision F-A: E-0 (G) and Earlier OFF OFF OFF OFF OFF OFF OFF OFF OFF DCM-270BAH(-OS) F-A: E-0 (H) to F-1...

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

    4. 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 37: Bin Control Shutdown Delay (S1 Dip Switch 9) (F-C Cb Only)

    7. Bin Control Shutdown Delay (S1 dip switch 9) (F-C CB Only) 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 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. 3. 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 44 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 45 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 46 15) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). Do not use R-404A as a mixture with pressurized air for leak testing.
  • Page 47 5b. Lower Housing 11) Remove the O-ring and the bolts securing the housing to the gear motor and remove the housing from the gear motor. If inspection of the upper bearing inside the extruding head (see "IV.C.1. Upper Bearing Wear Check") indicates that it is out of tolerance, replace both it and the bearing inside the lower housing.
  • Page 48 6. Removal and Replacement of Gear Motor 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 49: 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 50: 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 51: 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 52: 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 53: 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) 35 (12) APPROXIMATE STORAGE CAPACITY 8.8 lbs.

  • Page 54: Wiring Diagrams

    B. Wiring Diagrams 1. DCM-270BAH(-OS): Serial Number: C10508L to D00829A (except C17634M and C17641M) (BR) 115/60/1 POWER SWITCH COMPRESSOR CONTROL RELAY START START CAP. RELAY 145-174MFD EXTERNAL PROTECTOR DISPENSE RELAY GEAR MOTOR INTERNAL PROTECTOR CAP. (BK) 10MFD EXTERNAL PROTECTOR (DBU) (GY) (GY) DISPENSE...

  • Page 55: Dcm-270Bah(-Os)

    2. DCM-270BAH(-OS): Serial Number: C17634M, C17641M, and D-00998A 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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