Hoshizaki IM-50BAA-Q Service Manual
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Hoshizaki IM-50BAA-Q Service Manual

Self-contained cuber
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Service Manual
Self-Contained Cuber
Model
IM-50BAA-Q
hoshizakiamerica.com
Number: M041-1092
Issued: 05-01-2020

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Summary of Contents for Hoshizaki IM-50BAA-Q

  • Page 1 Service Manual Self-Contained Cuber Model IM-50BAA-Q Number: M041-1092 hoshizakiamerica.com Issued: 05-01-2020...
  • Page 2 Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, write, or send an e-mail message 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 [c] Front Panel (Lower) ..................32 [d] Rear Panel ....................... 32 [e] Door Assembly, Slope, Spring ................. 32 2. Refrigeration Circuit....................33 [a] Compressor ..................... 33 [b] Condenser ....................... 34 [c] Hot Gas Valve ....................34 [d] Upper Evaporator .................... 35 [e] Fan Motor ......................

  • 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 • 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 7: Construction And Water/Refrigeration Circuit Diagram

    I. Construction and Water/Refrigeration Circuit Diagram A. Construction Top Panel Top Insulation Top Cover Bracket - Top Panel Screw Bracket - Top Panel Screw Front Panel (Lower) Front View (Outside) Screw Rear Panel Rear View (Outside) Power Supply Cord...
  • Page 8 Drain Pan Scoop Holder Bin Control Control Box Control Switch Fuse Holder Water Plate Evaporator Thermistor Cam Switch Evaporator Water Plate Switch Actuator Motor Ice Guide Inlet Water Valve Water Tank Pump Motor Compressor Hot Gas valve Fan Motor Condenser Drier...

  • Page 9: Water/Refrigeration Circuit Diagram

    B. Water/Refrigeration Circuit Diagram Inlet Accumulator Evaporator Water Valve Water Tank Water Heat Pump Exchanger Hot Gas Valve Strainer Compressor Fan Motor Drier Condenser...

  • Page 10: Sequence Of Operation And Service Diagnosis

    II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow Chart 2. Harvest Cycle Cycle 1. 30-Sec. 3. Freeze Cycle • Max. harvest time: 30 min. Steps Startup • Max. freeze time: 60 min. (CB Setting 6) Cycle ET≤-4.9°F (-20.5°C) (CB Setting 2) Water Tank Opens...

  • Page 11: Sequence Of Operation

    B. Sequence of Operation 1. Startup Cycle When power supply is turned on, "on" appears on CB display and HGV energizes. 30 sec. later, harvest cycle starts. • If the "RESET" button is pressed during 30-sec. startup cycle time, startup cycle ends immediately and harvest cycle starts.

  • Page 13: Service Diagnosis Table

    C. Service Diagnosis Table First see "III.G. Error Codes." If there are no recorded errors, refer to the table below. No Ice Production - Possible Cause 1. Power Supply a) Off, blown fuse, or tripped breaker. b) Not within specifications. 2.
  • Page 14 Long Freeze Cycle 1. Evaporator a) Scaled up, dirty. 2. Hot Gas Valve a) Defective. 3. Condenser a) Restricted. 4. Control Board a) Defective. 5. Refrigerant Charge a) Low. 6. Compressor a) Inefficient or off. Slab Does Not Break Into Separate Cubes - Possible Cause 1.

  • Page 15: Bin Control Check And Cleaning

    D. Bin Control Check and Cleaning 1. Bin Control Check This appliance uses a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required. To check, follow the steps below. 1) Remove the front panel and then move the control switch to the "OFF" position. 2) Unplug the appliance.

  • Page 16: Bin Control Cleaning

    BC from the bin control bracket and move to the front of the icemaker for cleaning. 5) Remove the actuator paddle from the switch mount. See Fig. 1. 6) Wipe down BC with a mixture of 1 part of Hoshizaki "Scale Away" and 25 parts of warm water. Rinse the parts thoroughly with clean water.

  • Page 17: Evaporator Thermistor Check

    E. Evaporator Thermistor Check To check thermistor resistance, follow the steps below. 1) Remove the front panel and then move the control switch to the "OFF" position. 2) Unplug the appliance. 3) Remove the control box cover. 4) Remove the thermistor from the evaporator. 5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min.

  • Page 18: Controls And Adjustments

    The control switch has three positions: OFF for power off, ICE for icemaking, and WASH to energize the water pump when cleaning and sanitizing. B. Control Board • A Hoshizaki exclusive control board is employed in IM series appliances. • All models are pretested and factory adjusted. NOTICE •...

  • Page 19: Control Board Layout

    1. Control Board Layout • CN12 Connector Hall IC XA Connector (4P) • CN14 Connector XA Connector (3P): Unused • CN13 Connector Evaporator (Cube Control) Thermistor XA Connector (2P) • 7-Segment Double- • CN11 Connector Digit Display 5 VDC Input XMP Connector (6P) CN11 •...

  • Page 20: Control Buttons

    C. Control Buttons The control board features RESET, SERVICE 1, and SERVICE 2 Buttons 1. RESET Button • Press briefly to go to initial harvest cycle. • Press and hold for 3 seconds to enter control board setting mode. For details about control board settings, see "III.D.

  • Page 21: Control Board Settings

    D. Control Board Settings NOTICE Failure to maintain factory settings may adversely affect performance and warranty coverage. For more information, contact your Hoshizaki Service Center. 1) With "on" in display, press and hold the "RESET" button for 3 seconds. Display changes to "1".
  • Page 22 Control Board (CB) Setting Menu Category No. Item Range Default Basic 1 Harvest Cycle Termination Temperature 2 to 20°C Temperature to complete harvest cycle (detected by (1°C increments) evaporator (cube control) thermistor). 2 Freeze Cycle Termination Temperature -5 to -40°C -20.5 Target integrated value inside control board is determined (0.5°C increments.
  • Page 23 Control Board (CB) Setting Menu Category No. Item Range Default Water Supply 10 Harvest Cycle Water Supply Time: Water Temperature 1 to 99 sec, Lower Than 13°C 99=continuous Time to supply harvesting water to melt ice on water (1 sec. increments) plate at water supply temp lower than 13°C.
  • Page 24 Control Board (CB) Setting Menu Category No. Item Range Default Other, 22 Refrigeration Circuit Cycling when Bin Full On=1; Off=0 continued Selection of control to prevent ice in storage bin from melting in bin control cycle (by operating refrigeration unit). SETTING CHANGE IS INEFFECTIVE.
  • Page 25 Control Board (CB) Setting Menu Category No. Item Range Default Pump Motor, 42 Low Speed Rotation Condition 10 to 100% continued Condition to decrease target pump motor rotation speed (00=100) in freeze cycle. (1% increments) 43 Low Speed Rotation Rate 50 to 100% Percentage against target rotation speed (CB Setting 41).

  • Page 26: Control Board Information Display

    E. Control Board Information Display 1. With unit on, press and hold the "SERVICE 1" button for 3 seconds. Display changes to "n1". 2. Use the "SERVICE 1" and "SERVICE 2" buttons to move through the list. 3. Press the "RESET" button to view the item’s value. 4.

  • Page 27: Control Board Model Code Setting

    Control Board Information Display No. Item Display (example) Error log If 4 errors from latest to oldest are E4, E8, E3, and E1 F. Control Board Model Code Setting 1. Control Board Replacement 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.
  • Page 28 4) Press the "RESET" button to return to list. To clear error log history, press and hold the "SERVICE 1" and "SERVICE 2" buttons simultaneously for 5 sec. 5) Display returns to normal if no buttons are touched for 20 sec. Error Codes Error Item Description...

  • Page 29: Service Diagnosis

    2. Service Diagnosis Error Codes Error Check Possible Cause Remedy Inlet water valve Closing failure Clean or replace Refrigeration circuit Gas leak Repair Clogged capillary Replace heat exchanger Clogged expansion valve Replace Compressor Defective Replace Starting failure Check supply voltage or replace electrical components Compressor relay Coil circuit open...

  • Page 30: 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. • To reduce the risk of electric shock, do not touch the control switch or plug with damp hands.

  • Page 31: Brazing

    2. Brazing WARNING • R-134a itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). • R-134a 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 32: Component Service Information

    For the required refrigerant charge, see the nameplate. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets AHRI Standard 700 (latest edition) be used. 6) A liquid charge is required when charging an R-134a system. Place the service cylinder on the scales;...

  • Page 33: [B] Front Frame, Drain Pan

    [b] Front Frame, Drain Pan 1) Remove the front frame, and release its tab from the drain pan. 2) Pull off the drain pan towards you. (The rear of the drain pan rests on the projection from the bin.) 3) Replace the removed parts in the reverse order of the removal procedure. [c] Front Panel (Lower) 1) Unscrew the front panel (lower), lift it up by by 2/5"...

  • Page 34: Refrigeration Circuit

    Hinge Door Stopper Slotted Hole Door Hook 2. Refrigeration Circuit * See “A. Refrigeration Circuit Service Information” for refrigerant recovery/charge and copper tube brazing instructions. ／ [a] Compressor 1:10     アイスキューバAY 不動態化処理 APPROVED 山崎 メイショウ 表 1 2020.02.21 品番63追加 石富 山崎 面...

  • Page 35: [B] Condenser

    [b] Condenser 1) Remove the front panel (lower), move the control switch to the “OFF” position, and then unplug the appliance. 2) Remove the control box and air guide from the machine compartment. 3) Remove the access valve from the condenser shroud to recover the refrigerant from the valve.

  • Page 36: [D] Upper Evaporator

    APPROVED ホシザキ株式会社 2) Close the water supply line shut-off valve. HOSHIZAKI CORPORATION 3) Remove the top panel, top insulation, and top cover. 4) Remove the front frame, drain pan, ice guide, water tank assembly, inlet water valve, water supply pipe, actuator motor assembly, and cam shaft assembly.
  • Page 37 APPROVED ホシザキ株 201802 3D̲prt HOSHIZAKI CORPORATION Upper Evaporator Location Adjustment 1) Loose the bolt fixing the evaporator bracket to the mechanism base to move the bracket freely. 2) Screw the flange nut (with the flange side up) into the evaporator bolt of the upper...
  • Page 38 3) Insert the evaporator bolt from the bottom into the evaporator bracket hole, and put the plastic washer from the top. Then, screw the flange nut into the evaporator bolt while allowing the upper evaporator to move up and down. 4) Move the control switch to the “ICE”...

  • Page 39: [E] Fan Motor

    Evaporator Bracket Bolt Flange Nut Plastic Washer [e] Fan Motor 1) Remove the front panel (lower), move the control switch to the “OFF” position, and then unplug the appliance. 2) Remove the control box and air guide from the machine compartment. 3) Remove the access valve from the condenser shroud.

  • Page 40: Icemaking Mechanism

    201802 3D̲prt 1) Remove the front panel (lower). HOSHIZAKI CORPORATION 2) Move the control switch to the “ICE” position, and press the “RESET” button. Then, the water tank assembly starts to open. 3) While the water tank assembly stops to open and starts to close, move the control switch to the “OFF”...

  • Page 41: [C] Water Plate Switch

    [c] Water Plate Switch 1) Remove the screws and nuts fixing the water plate switch to the mechanism base. [d] Cam Switch 1) Unscrew and remove the cam switch from the switch bracket. [e] Water Tank Assembly 1) Remove the flange nuts fixing the bearing plate to the mechanism base. 2) Pull out the water tank assembly with the bearing plate from the bottom.
  • Page 42 Switch Cam (B) Water Plate Switch Bearing Plate Spring Bracket Switch Cam Shaft Assy Flange Spring Water Tank Bracket Assy Screw Spacer Cam (A) Actuator Motor Assy Evaporator Screw Plastic Washer Screw Evaporator Base Discharge Hose Pump Motor Lower Evaporator Suction Hose Water Tank...
  • Page 43 Plastic Washer Evaporator Screw Lower Evaporator Flange Nut, Spring Washer, Washer Water Plate Switch and Cam Switch Operation 1) When harvest cycle starts after freeze cycle, the actuator motor rotates the cam counterclockwise. But the water tank assembly stays fully closed because ice is frozen to the lower evaporator.

  • Page 44: [J] Ice Guide

    Cam Switch Positioning 1) To adjust the cam switch position, loosen the bolts fixing the switch bracket, and move it to the left-or-right. 2) Check that the cam switch closes when the cam is in the location shown below. Switch Bracket Bolt Water Plate Switch...
  • Page 45 Ice Guide Rotation Check 1) When installing the ice guide assembly, check that the ice guide rotates together with the water tank assembly when it opens and closes. 2) When the water tank assembly opens, the plastic hex head bolt fixing the spring presses the plate fitted to the ice guide which in turn covers the top of the lower evaporator.

  • Page 46: 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 plug with damp hands.

  • Page 47: Preparing The Appliance For Periods Of Non-Use

    VI. Preparing the Appliance for Periods of Non-Use NOTICE • During extended periods of non-use, extended absences, or in sub-freezing temperatures, follow the instructions below to reduce the risk of costly water damage. • To prevent damage to the water pump, do not leave the control switch in the "WASH"...
  • Page 48 Icemaker / Ice Storage Bin Drain Outlet 3/4" NPT Icemaker Water Supply Inlet 1/2" NPT Vent Tube Shut-off Valve Minimum 1/4" Nominal ID Copper Water Tubing or Equivalent 1/4" fall per foot Drain Valve Be sure there is sufficient extra water 2-inch (5-cm) supply line and drain line for the appliance To approved...

  • Page 49: 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. IMPORTANT The insulation foaming agent used for the unit body contains flammable gas cyclopentane.

  • Page 50: Technical Information

    VIII. Technical Information We reserve the right to make changes in specifications and design without prior notice. A. Specification Data AC SUPPLY VOLTAGE 115/60/1 AMPERAGE 5.0A ( 5 Min. Freeze AT 104 °F / WT 80 °F ) MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION Ambient...

  • Page 51: Performance Data

    B. Performance Data Pressure data is recorded at 5 min. into freezing cycle. APPROXIMATE Ambient Water Temp. (°F) ICE PRODUCTION PER 24 HR. Temp. (°F) 50(23) 47(21) 44(20) 49(22) 46(21) 43(20) 47(21) 45(20) 42(19) lbs./day (kg/day) 44(20) 42(19) 39(18) APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER...

  • Page 52: Wiring Diagram

    C. Wiring Diagram...

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