Hoshizaki IM-50BAA-LM Service Manual
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Hoshizaki IM-50BAA-LM Service Manual

Hoshizaki IM-50BAA-LM Service Manual

Self-contained cuber
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Service Manual
Self-Contained Cuber
Model
IM-50BAA-Q
IM-50BAA-LM
hoshizakiamerica.com
Number: M041-1092
Issued: 05-31-2022

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Summary of Contents for Hoshizaki IM-50BAA-LM

  • Page 1 Service Manual Self-Contained Cuber Model IM-50BAA-Q IM-50BAA-LM Number: M041-1092 hoshizakiamerica.com Issued: 05-31-2022...
  • 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 [a] Compressor ..................... 40 [b] Condenser ....................... 40 [c] Hot Gas Valve ....................41 [d] Upper Evaporator (IM-50BAA-Q) ..............42 [e] Evaporator (IM-50BAA-LM) ................45 [f] Fan Motor ......................46 3. Icemaking Mechanism (IM-50BAA-Q) ..............47 [a] Actuator Motor Assembly ................. 47 [b] Cam Shaft Assembly ..................

  • 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 IM-50BAA-Q 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 IM-50BAA-LM Drain Pan Bin Control Control Box Control Switch Fuse Holder Evaporator Thermistor Evaporator Water Plate Inlet Water Valve Pump Motor Actuator Motor Water Tank Compressor Hot Gas valve Fan Motor Drier Condenser...

  • Page 10: 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 11: Sequence Of Operation And Service Diagnosis

    II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow Chart IM-50BAA-Q 2. Harvest Cycle Cycle 1. 30-Sec. 3. Freeze Cycle Startup • Max. harvest time: 30 min. Steps • Max. freeze time: 60 min. (CB Setting 6) Cycle ET≤-4.9°F (-20.5°C) (CB Setting 2)
  • Page 12 IM-50BAA-LM 3. Freeze Cycle 1. 30-Sec. 2. Harvest Cycle Cycle • Max. freeze time: 90min. (CB Setting 6) Startup • Max. harvest time: 30 min. Steps Cycle WV: energized WT<55.4°F (13°C): ET≥50°F (10°C) (CB Setting 10) WV: energized 24 sec.

  • Page 13: Sequence Of Operation

    B. Sequence of Operation IM-50BAA-Q 1. Startup Cycle When power supply is turned on, "on" appears on CB display and HGV energizes. 30 seconds later, harvest cycle starts. • If the "RESET" button is pressed during 30-second startup cycle time, startup cycle ends immediately and harvest cycle starts.
  • Page 14 IM-50BAA-LM 1. Startup Cycle When power supply is turned on, "on" appears on CB display and HGV energizes. 30 seconds 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 15 IM-50BAA-Q...
  • Page 16 IM-50BAA-LM...

  • Page 17: 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 18 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 19: Bin Control Check And Cleaning

    D. Bin Control Check and Cleaning 1. Bin Control Check IM-50BAA-Q 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 20 IM-50BAA-LM This appliance uses a lever-actuated microswitch 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.

  • Page 21: 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 22 5) Remove the actuator paddle from the BC box. Then, remove the actuator plate from the actuator paddle. 6) Wipe down the actuator paddle and actuator plate with a mixture of 1 part of Hoshizaki "Scale Away" and 25 parts of warm water. Rinse the parts thoroughly with clean water.

  • Page 23: 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 24: 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 25: 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 26: 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 27: 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 28 Control Board (CB) Setting Menu Default Default Category No. Item Range (50BAA-Q) (50BAA-LM) 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 -29.0...
  • Page 29 Control Board (CB) Setting Menu Default Default Category No. Item Range (50BAA-Q) (50BAA-LM) Water 10 Harvest Cycle Water Supply Time: Water 1 to 99 sec, Supply Temperature Lower Than 13°C 99=continuous Time to supply harvesting water to melt ice on (1 sec.
  • Page 30 Control Board (CB) Setting Menu Default Default Category No. Item Range (50BAA-Q) (50BAA-LM) Other 20 Display Switching in Operation 0="on" Switches 7-segment display during operation. constantly "0": Display constantly shows "on". displayed "1": Display shows "on" for 3 min just after power 1=bar displayed supply is turned on and then shows bar such as "_ _"...
  • Page 31 Control Board (CB) Setting Menu Default Default Category No. Item Range (50BAA-Q) (50BAA-LM) Water 36 Water Regulating Valve Error Detection Temperature 0 to 50°C Regulating Thermistor temperature (water regulating valve 0=ignore Valve outlet) in case of water regulating valve error and (1°C increments) cooling water failure for water-cooled model.

  • Page 32: Control Board Information Display

    Control Board (CB) Setting Menu Default Default Category No. Item Range (50BAA-Q) (50BAA-LM) Hard Water 60 Operating Condition 10 to 100% Control Condition to operate cloudy ice control in hard water (00=100) application indicated in percentage against target (1% increments) integrated value.
  • Page 33 Control Board Information Display No. Item Display (example) – n*, h* n1 Freeze cycle time 21 min or 21% 100% (last 2 digits only) count up (min) n2 Freeze cycle termination rate (%) n3 Current evaporator -2°F (-19°C) 75°F (24°C) (cube control) thermistor temp n4 Current control...

  • Page 34: Control Board Model Code Setting

    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. • Move the control switch to the "OFF" position and unplug the appliance from the electrical outlet before servicing.
  • Page 35 Error Codes Error Item Description Operation Reset Freeze error Freeze backup timer (45 minutes Shut down Press "RESET" button after water tank assembly starts to close) counts up before freeze cycle completes, and evaporator temperature is 32°F (0°C) or higher. Harvest error Harvest backup timer (30 minutes after Shut down Press "RESET"...

  • Page 36: 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 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. • To reduce the risk of electric shock, do not touch the control switch or plug with damp hands.

  • Page 38: 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 39: 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 40: [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 41: 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) Remove the front panel (lower) and rear panel, move the control switch to the “OFF” 1:10     アイスキューバ...

  • Page 42: [C] Hot Gas Valve

    (20) 1 2020.02.21 品番63追加 石富 山崎 面 焼痕除去 処 CHECKED 野津 TITLE 理 脱脂洗浄 1H6250A 等 (30)   焼痕銀粉塗布 図番 全 DESIGNED 石富 UNIT 面 バリ無きこと DATE 2020.01.09 DRAWN 石富 SCALE 1:10 DRAWING No. SYMBOL DATE REVISION DESIGNED APPROVED ホシザキ株式会社 HOSHIZAKI CORPORATION...

  • Page 43: [D] Upper Evaporator (Im-50Baa-Q)

    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 44 Upper Evaporator Water Supply Pipe Cam Shaft Assy Inlet Water Valve 普通寸法公差（±）単位mm 角度差（±） PARTS CODE     NAME  &  SPEC. Q'TY 寸法区分 指示なき取 0 1H6248A01 メカニズムAY Water Tank Assy N JK LM N 付穴のピッ          4以下 0.05 0.1 チとその累    4をこえ 16〃 積公差は   16〃   63〃   63〃  250〃  250〃 1000〃 1000をこえる Actuator Motor Assy Ice Guide 寸法公差（±）単位mm 角度差（±）...

  • Page 45: [E] Evaporator (Im-50Baa-Lm)

    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 46 Bracket Bolt Plastic Washer [e] Evaporator (IM-50BAA-LM) 1) Remove the front panel (lower) and rear panel, press the "RESET" button on the control box, move the control switch to the “OFF” position with the water tank assembly opened, and then unplug the appliance.

  • Page 47: [F] Fan Motor

    Cam Shaft Assy Evaporator Mechanism Inlet Water Bolt Base Valve Inlet Water Valve Evaporator Bin Control Switch Water Tank Assy Evaporator Thermistor Actuator Motor Assy [f] Fan Motor 1) Remove the front panel (lower), move the control switch to the “OFF” position, and then unplug the appliance.

  • Page 48: Icemaking Mechanism (Im-50Baa-Q)

    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 49: [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 50 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 51 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 52: [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 53 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 54: Icemaking Mechanism (Im-50Baa-Lm)

    4. Icemaking Mechanism (IM-50BAA-LM) 1) Remove the front panel (lower). 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 55 Spring Shaft Bearing Plate Cam Shaft Assy Actuator Motor Assy Bin Control Switch Discharge Tubing Water Plate Pump Motor Packing Water Tank...

  • Page 56: 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 57: 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 58 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 59: 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 60: Technical Information

    VIII. Technical Information We reserve the right to make changes in specifications and design without prior notice. A. Specification Data IM-50BAA-Q 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 61: Performance Data

    IM-50BAA-LM 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 Water Temp ( °F) PER 24 HR. Temp ( °F) lbs./day ( kg/day )
  • Page 62 B. Performance Data Pressure data is recorded at 5 min. into freezing cycle. IM-50BAA-Q 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...
  • Page 63 IM-50BAA-LM APPROXIMATE Ambient Water Temp. (°F) ICE PRODUCTION PER 24 HR. Temp. (°F) 52(24) 48(22) 46(21) 48(22) 46(21) 44(20) 47(21) 45(20) 42(19) lbs./day (kg/day) 44(20) 42(19) 40(18) APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER 27(0.10) 24(0.09) 24(0.09) CONSUMPTION PER 24 HR.

  • Page 64: Wiring Diagram

    C. Wiring Diagram IM-50BAA-Q 5VDC 5VDC 24VDC 5VDC 115VAC 24VDC 24VDC 5VDC 115VAC...
  • Page 65 IM-50BAA-LM 5VDC 5VDC 24VDC 5VDC 115VAC 24VDC 24VDC 5VDC 115VAC...

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