Hoshizaki AM-50BAE Service Manual
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Hoshizaki AM-50BAE Service Manual

Hoshizaki AM-50BAE Service Manual

Self-contained cuber (open cell type)
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Reliability is a
beautiful thing
TM
SERVICE MANUAL
SELF-CONTAINED CUBER
(OPEN CELL TYPE)
Model
AM-50BAE
AM-50BAE-AD
NUMBER: 73126
ISSUED: December 22, 2004

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Summary of Contents for Hoshizaki AM-50BAE

  • Page 1 Reliability is a beautiful thing SELF-CONTAINED CUBER (OPEN CELL TYPE) Model AM-50BAE AM-50BAE-AD SERVICE MANUAL NUMBER: 73126 ISSUED: December 22, 2004...
  • Page 2 No such service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. HOSHIZAKI provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call or write to the HOSHIZAKI Technical Support Department for assistance.

  • Page 3: Table Of Contents

    This manual should be made available to the technician prior to service or maintenance. I. Specifications ... 5 1. Dimensions/Connections ... 5 [a] AM-50BAE ... 5 [b] AM-50BAE-AD ... 6 2. Specifications ... 7 [a] AM-50BAE ... 7 [b] AM-50BAE-AD ...
  • Page 4 4. Timing Chart ... 33 5. Performance Data ... 34 [a] AM-50BAE ... 34 [b] AM-50BAE-AD ... 35 VI. Service Diagnosis ... 36 VII. Removal and Replacement of Components ... 39 1. Service for Refrigerant Lines ... 39 [a] Service Information ... 39 [b] Refrigerant Recovery ...

  • Page 5: Specifications

    I. Specifications 1. Dimensions/Connections [a] AM-50BAE Units = mm U1VA6060209...

  • Page 6: [B] Am-50Bae-Ad

    [b] AM-50BAE-AD Units = mm U1VA6060209...

  • Page 7: Specifications

    2. Specifications [a] AM-50BAE U1VA6060209...

  • Page 8: [B] Am-50Bae-Ad

    [b] AM-50BAE-AD AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC & WATER CONSUMPTION ELECTRIC W (kWH/100 lbs.)

  • Page 9: General Information

    II. General Information 1. Construction Top Panel Ice Making Mechanism Scoop Holder Front Panel Control Switch Louver U1VA6060209 Bin Control Thermostat Slope Magnet Catch Door...

  • Page 10: Icemaking Compartment

    2. Icemaking Compartment Bracket Evaporator Separator Ice Chute Pump Motor Nozzle Water Tank Hose Joint U1VA6060209...

  • Page 11: Installation And Operating Instructions

    III. Installation and Operating Instructions 1. Checks Before Installation * Visually inspect the exterior of the shipping container and report any severe damage to the carrier. Remove shipping tape(s) and packing as follows. If any are left in the icemaker, it will not work properly. 1.

  • Page 12: Setup

    Secure the counter to the wall with a bracket or the like. Ensure a 15" (381 mm) wide, min. 34" (864 mm) high space for the icemaker. For the AM-50BAE-AD ensure a min. 32" (814 mm) high space for the icemaker. IMPORTANT Do not let the weight of the counter rest on the icemaker.
  • Page 13 3) To build in between a unit and an open space: AM-50BAE AM-50BAE-AD Use a cabinet or the like to support the counter before building in the icemaker. [b] Building in the Icemaker 1) Make water supply and drain connections.

  • Page 14: Reversing The Door Hinges

    Reversing the Door Hinges 1) Right-hinged door. 2) a. Remove the hinge stop pin from hinge (B). b. Remove the door from hinge (A). 3) c. Remove the two screws securing the top panel. d. Remove hinge (A) and brace - top. e.
  • Page 15 4) f. Remove hinge (A) and brace - top from the body. Attach brace - top to body (right). Flip hinge (A) over as shown in the illustration below, and fasten to body (left). g. Turn the top panel 180°, hook its rear on the body, and secure its front with screws.

  • Page 16: Electrical Connections

    7) Left-hinged door. 4. Electrical Connections THIS APPLIANCE MUST BE GROUNDED. This icemaker requires a ground that meets national and local electrical code requirements. To prevent possible severe electrical shock injury to individuals or extensive damage to equipment, install a proper ground wire to this icemaker.

  • Page 17: Water Supply And Drain Connections

    5. Water Supply and Drain Connections To prevent damage to the freezer mechanism, do not operate this icemaker when the water supply is OFF, or if the pressure is below the recommended minimum water pressure of 10 PSIG (0.7 bar). Stop the icemaker until proper water pressure is resumed.

  • Page 18: Final Check List

    6. Final Check List 1) Is the icemaker level? 2) Is the icemaker in a site where the ambient temperature is within 45°F (7°C) to 100°F (38°C) and the water temperature within 45°F (7°C) to 95°F (35°C) all year around? 3) Have all shipping tape(s), string and packing been removed from the icemaker? 4) Are all components, fasteners and thumbscrews securely in place? 5) Have all electrical and piping connections been made?

  • Page 19: Preparing The Icemaker For Long Storage

    8. Preparing the Icemaker for Long Storage Drain the icemaker to prevent damage to the water supply line at subfreezing temperatures, using air or carbon dioxide. Shut off the icemaker until proper air temperature is resumed. 1) Close the water supply line shut-off valve, and open the drain valve. 2) Move the control switch to the “OFF"...

  • Page 20: Cleaning And Maintenance

    [a] Cleaning Solution Dilute 5 fl. oz. (148 ml) of recommended cleaner Hoshizaki “Scale Away" or “LIME-A-WAY" (Economics Laboratory, Inc.) with 1 gallon (3.8 l) of warm water. For safety and maximum effectiveness, use the solution immediately after dilution.

  • Page 21: [B] Cleaning Procedure

    [b] Cleaning Procedure The cleaning process will remove lime deposits from the water system. 1) Remove all ice from the evaporator and the storage bin. Note: To remove cubes on the evaporator, move the control switch to the “OFF" position and move it back to the “ICE"...

  • Page 22: [C] Sanitizing Solution

    10) Remove the water tank, drain it, and replace it as described in 3) through 6). 11) Open the water supply line shut-off valve. 12) Move the control switch to the “WASH" position to circulate clean water for about 5 minutes. 13) Move the control switch to the “OFF"...
  • Page 23 6) Disconnect the suction tube by compressing both plastic tabs to unlock the joint in the direction of the black arrows and pulling the tube clear to drain the tank. 7) Spread out the tabs on both sides to unlock the water tank, and pull it out toward you.
  • Page 24 12) Slide in the spray assembly along the rails on the right and left brackets. Refit the discharge tube securely on the spray assembly. A loose fitting may cause a water leak. 13) Position and lock the ice chute onto the front and rear frame pipes by pushing the chute down until it clicks onto both pipes.
  • Page 25 20) Mix a new batch of the sanitizing solution and slowly pour it into the water tank. 21) Move the control switch to the “WASH" position. 22) After circulating the sanitizing solution for about 15 minutes, move the control switch to the “OFF"...
  • Page 26 29) Move the control switch to the “WASH" position to circulate clean water for about 5 minutes. 30) Move the control switch to the “OFF" position, then remove the water tank, drain it, and replace it as described in 23) through 26). 31) Repeat 29) and 30) two more times to rinse thoroughly.

  • Page 27: Maintenance

    2. Maintenance This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. 1) Exterior To keep the exterior clean, wipe occasionally with a clean and soft cloth. Use a damp cloth containing a neutral cleaner to wipe off all oil or dirt build-up. 2) Condenser Check the condenser once a year, and clean if required by using a brush or vacuum cleaner.

  • Page 28: Technical Information

    V. Technical Information 1. Water Circuit and Refrigerant Circuit Evaporator Water Inlet Water Tank Pump Motor Compressor Capillary Tube Accumulator Ice Chute Spray Assembly Controller Board Condenser Water Circuit Refrigeration Circuit Hot Gas Valve Drier U1VA6060209...

  • Page 29: Wiring Diagram

    2. Wiring Diagram U1VA6060209...

  • Page 30: Controls

    3. Controls [a] Icemaking Control The freeze and defrost cycles are controlled by the combination of a thermistor and an electronic controller. When the evaporator cools down to a specific temperature (around +28°F (-2°C)), the thermistor attached to the evaporator senses the temperature and signals to the electronic controller.

  • Page 31: [D] Before Checking The Electronic Controller

    [d] Before Checking the Electronic Controller Check the power source voltage and the thermistor as shown in the table below. Component Thermistor (on evaporator) Holder Thermistor U1VA6060209 Procedure Thermistor sensor part is fragile, glass sealed. Handle with care. Screw * Disconnect the thermistor on the board.

  • Page 32: [E] Adjustment At Part Replacement

    [e] Adjustment at Part Replacement The thermistor and electronic controller are designed for optimum ice production. If adjustment is desired at part replacement, follow the instructions below. Fig. 8 The variable resistor VR1 is for a fine adjustment of the defrost cycle completion temperature. It needs no adjustment at part replacement.

  • Page 33: Timing Chart

    4. Timing Chart U1VA6060209...

  • Page 34: Performance Data

    5. Performance Data [a] AM-50BAE U1VA6060209...

  • Page 35: [B] Am-50Bae-Ad

    [b] AM-50BAE-AD APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day /day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG kg/cm SUCTION PRESSURE PSIG kg/cm TOTAL HEAT OF REJECTION FROM CONDENSER Note: Pressure data is recorded at 5 minutes into freezing cycle.

  • Page 36: Service Diagnosis

    VI. Service Diagnosis PROBLEM [1] The icemaker will not a) Power Cord start b) Power Switch c) Supply Voltage d) Bin Control Thermostat e) Heater [2] Compressor will not start a) Compressor b) Protector c) Starter [3] Fan motor or pump a) Wiring motor will not run b) Fan Motor, Pump Motor...
  • Page 37 PROBLEM [6] Water will not be supplied [7] Water continues to be supplied in freeze cycle [8] No water comes from water tank [9] All components run but no ice is produced [10] Large-hole cubes U1VA6060209 CHECK POSSIBLE CAUSE a) Water Supply 1.
  • Page 38 PROBLEM [11] Cloudy cubes a) Water Quality b) Nozzle c) Water System [12] Freeze cycle time is too a) Ambient temperature long b) Air Inlet / Outlet ( bottom front ) c) Thermistor d) Refrigerant Circuit e) Fan Motor f) Condenser [13] Icemaker will not stop a) Bin Control Thermostat when bin is filled with ice...

  • Page 39: Removal And Replacement Of Components

    VII. Removal and Replacement of Components Ensure all components, fasteners and thumbscrews are securely in place after the equipment is serviced. 1. Service for Refrigerant Lines [a] Service Information 1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture [R134a] The compressor must not be opened more than 30 minutes in replacement or service.

  • Page 40: [B] Refrigerant Recovery

    6) Replacement Copper Tubing [R134a] The copper tubes currently in use are suitable for R134a. But do not use them if oily inside. The residual oil in copper tubes should be as little as possible. (Low residual oil type copper tubes are used in the shipped units.) 7) Evacuation, Vacuum Pump and Refrigerant Charge [R134a] Never allow the oil in the vacuum pump to flow backward.

  • Page 41: [C] Evacuation And Recharge

    [c] Evacuation and Recharge 1) Attach charging hoses, a service manifold and a vacuum pump to the system. If possible, use quick release connectors onto the access valves (especially on the high side). 2) Turn on the vacuum pump. 3) Allow the vacuum pump to pull down to a 29.9” Hg (760 mm Hg) vacuum. Evacuating period depends on the pump capacity.

  • Page 42: Compressor

    16) Connect the solderless terminals and replace the terminal cover in its correct position. 17) Refit the panels in their correct positions. 18) Plug in the icemaker or connect the power source. Note: Hoshizaki recommends that compressor starting components are always replaced at the same time as the compressor. U1VA6060209...

  • Page 43: Drier

    3. Drier 1) Unplug the icemaker or disconnect the power source. 2) Remove the rear panel, louver and front panel. 3) Recover the refrigerant and store it in a proper container, if required by an applicable law (See “1.[b] Refrigerant Recovery”). 4) Remove the drier holder, if any, and pull the drier towards you for easy service.

  • Page 44: Evaporator

    4. Evaporator 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) Unplug the icemaker or disconnect the power source. 2) Remove the rear panel, door, louver, top and front panels. 3) Recover the refrigerant and store it in a proper container, if required by an applicable law (See “1.[b] Refrigerant Recovery”).

  • Page 45: Hot Gas Valve

    5. Hot Gas Valve 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) Unplug the icemaker or disconnect the power source. 2) Remove the rear panel, louver and front panel.

  • Page 46: Pump Motor

    6. Pump Motor 1) Unplug the icemaker or disconnect the power source. 2) Remove the top panel, door and pipe cover (rear). 3) Disconnect the pump motor leads inside the pipe cover (rear). 4) Drain the water tank by compressing the plastic tabs on the suction tube to release the joint.

  • Page 47: Water Valve

    8. Water Valve 1) Close the water supply shut-off valve. 2) Unplug the icemaker or disconnect the power source. 3) Remove the door and top panel. 4) Disconnect the receptacle (leads) from the water valve. 5) Remove the valve outlet tubing. 6) Remove the water supply inlet and water valve by releasing the two retaining screws.

  • Page 48: Thermistor For Cube Control

    10. Thermistor for Cube Control 1) Unplug the icemaker or disconnect the power source. 2) Remove the top and front panels, door, louver, pipe cover (rear) and control box cover. 3) Remove the connectors on the controller board, referring to “9. Controller Board.” 4) Unscrew and remove the thermistor holder and thermistor, located on the evaporator.

  • Page 49: Bin Control Thermostat

    11. Bin Control Thermostat 1) Unplug the icemaker or disconnect the power source. 2) Remove the top panel, door and pipe cover (rear). 3) Remove the thermostat holder from the storage bin, and disconnect the the bin control thermostat bulb. 4) Remove the bin control thermostat from the icemaker body (rear).
  • Page 51 HOSHIZAKI HOSHIZAKI AMERICA, INC. 618 HIGHWAY 74 SOUTH PEACHTREE CITY, GA 30269 U.S.A. PHONE: 770-487-2331...

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