Service Manual Self-Contained Cuber Model IM-50BAA-Q hoshizakiamerica.
WARNING Only qualified service technicians should install and service the icemaker. To obtain the name and phone number of your local Hoshizaki Certified Service Representative, visit www.hoshizaki.com. No service should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage.
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.................................................................................................. 4 I.
[c] Front Panel (Lower).......................................................................................... 32 [d] Rear Panel........................................................................................................ 32 [e] Door Assembly, Slope, Spring.......................................................................... 32 2. Refrigeration Circuit............................................................................................... 33 [a] Compressor..........................
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. NOTICE Indicates a situation which could result in damage to the appliance or property. IMPORTANT Indicates important information about the installation, use, and care of the appliance.
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. • Young children should be properly supervised around the appliance. • Do not climb, stand, or hang on the appliance or appliance door or allow children or animals to do so.
I. Construction and Water/Refrigeration Circuit Diagram A.
Drain Pan Scoop Holder Bin Control Control Box Control Switch Fuse Holder Cam Switch Evaporator Thermistor Water Plate Evaporator Actuator Motor Water Plate Switch Ice Guide Inlet Water Valve Water Tank Pump Motor Compressor Hot Gas valve Fan Motor Condenser Drier 7
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II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow Chart Cycle Steps 1. 30-Sec. Startup Cycle 2. Harvest Cycle • Max. harvest time: 30 min. Water Tank Opens [1] [3] [2] Water Tank Stops Opening 3. Freeze Cycle • Max. freeze time: 60 min. (CB Setting 6) Water Tank Opened [4] Water Tank (Actuator Motor PS) Opens Again ET≥50°F (10°C) (CB Setting 1) Water Tank Closed (Actuator Motor PS) CB Setting 15 (*1) ET≤-4.9°F (-20.5°C) (CB Setting 2) WT≥55.4°F (13°C) or WT<55.
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. 2. Harvest Cycle See the timing chart on next page. 3. Freeze Cycle See the timing chart on next page. 4. Shutdown When BC is engaged (open) for more than 10 seconds, the icemaker shuts down after harvest cycle.
11 ON OFF ON OFF Close OFF Open ON OFF Compressor Inlet Water Valve Actuator Motor Hot Gas Valve ON OFF OFF 0ºC State 7 State 8 State 6 State 5 State 4 State 3 State 2 State 0 State 1 100% 60% 30% 0% Initial Cycle 5 1 3 4 15 sec 15 sec 6 50 sec Freeze Cycle 7 8 *1 *2 *3 Harvest Cycle - Normal 3 4 5 1 2 15 sec 15 sec Freeze Cycle 6 7 *1 1 2 *2 *3 80 sec *1 1 2 *2 *3 10 sec 80 sec 50 sec Harvest Cycle - Bin Control (2) 3 4 5 1) Target integrated value for freeze cy
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. 2. Fuse (Control Box) a) Blown. 3. Control Switch a) In "OFF" or "WASH" position. b) Not within specifications. b) Bad contacts. 4. Control Board a) Error. See "III.G. Error Codes." b) Defective. 5. Bin Control a) Tripped with bin filled with ice. See "II.D.
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. Spring a) Over-extended. 2. Water Plate a) Obstacle caught between evaporator and water plate. Cubes Drop Separately - Possible Cause 1. Refrigerant Charge a) Low - Long harvest cycle. 2. Cam Arm a) Worn out.
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. 3) Remove the control box cover. Clear any ice away from BC. 4) Check BC wire harness connections. 5) Disconnect BC wire harness connector from CB CN3 connector.
2. Bin Control Cleaning Scale may build up on BC. Scale can cause the actuator paddle and magnet to stick. In this case, BC should be cleaned. WARNING CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the icemaker is serviced. Make sure that none have fallen into the dispense unit/ice storage bin. 1) Remove the front panel and then move the control switch to the "OFF" position. Unplug the appliance. 2) Remove the top panel, top insulation, and top sheet.
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. 6) Disconnect the thermistor connector from CB CN13 connector and check the resistance between thermistor leads. Normal range is 4.7 to 6.2 kΩ.
III. Controls and Adjustments A. Control Switch 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 • Fragile, handle very carefully. • The control board contains integrated circuits, which are susceptible to failure due to static discharge.
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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. Control Board Settings." 2. SERVICE 1 and SERVICE 2 Buttons • Press the "SERVICE 1" or "SERVICE 2" button to select the desired setting number.
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". 2) Use the "SERVICE 1" and "SERVICE 2" buttons to choose a control board setting. 3) Press the "RESET" button to view the setting’s value. Current value flashes in display.
Control Board (CB) Setting Menu Category Basic No. Item Range 1 Harvest Cycle Termination Temperature Temperature to complete harvest cycle (detected by evaporator (cube control) thermistor). 2 to 20°C (1°C increments) 2 Freeze Cycle Termination Temperature Target integrated value inside control board is determined by CB Settings 2 and 3. Temperature in freeze cycle is integrated, and freeze cycle continues until target integrated value is reached, which determines dimple diameter setting 2 (medium).
Control Board (CB) Setting Menu Category No. Item 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. Adjustable between 1 and 99 sec. When set to "99", harvesting water keeps running until evaporator (cube control) thermistor senses harvesting completion temp.
Control Board (CB) Setting Menu Category No. Item Range Other, continued 22 Refrigeration Circuit Cycling when Bin Full Selection of control to prevent ice in storage bin from melting in bin control cycle (by operating refrigeration unit). SETTING CHANGE IS INEFFECTIVE. On=1; Off=0 Fan Motor 30 Type 0=water-cooled Selection of fan motor type. When set to “0”, unit operates 1=small / medium as water-cooled model.
Control Board (CB) Setting Menu Category No. Item Range Pump Motor, continued 42 Low Speed Rotation Condition Condition to decrease target pump motor rotation speed in freeze cycle. 10 to 100% (00=100) (1% increments) 30 43 Low Speed Rotation Rate 50 to 100% Percentage against target rotation speed (CB Setting 41). (1% increments) 100 Anti-Slush Control 50 Pump De-Energized Time 0 to 90 sec.
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. Press the "RESET" button to return to list. 5. Display returns to normal if no buttons are touched for 20 seconds. Control Board Information Display No.
Control Board Information Display No. Item Display (example) h4 If 4 errors from latest to oldest are E4, E8, E3, and E1 Error log 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.
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 Operation Reset E1 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.
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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. Make sure the control switch is in the "OFF" position before plugging in or unplugging the appliance.
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. • Do not use silver alloy or copper alloy containing arsenic. 1) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
from the hose. 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; if the service cylinder is not equipped with a dip tube, invert the service cylinder, then place it on the scales. Open the high-side valve on the gauge manifold.
[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" (10 mm), and pull it off towards you. (The front panel (lower) is hooked on the bracket screws.
A 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 ／ メイショウ (20) アイスキューバAY 山崎 1 2020.02.21 品番63追加 石富 山崎 1) Remove the panel (lower) and rear panel, move the control switch野津 to theTITLE(30)“OFF” UNIT position, and then unplug the appliance. 石富 mm 図番 DRAWN DATE SCALE DRAWING No. SYMBOL P DATE REVISION DESIGNED APPROVED 2020.01.
[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. 4) Unscrew the condenser, and pull out the condenser. 5) The shroud, fan motor and drier come off together with the condenser. 6) Remove the screws fixing the shroud to the condenser from the machine compartment side.
6 3 2 1 30' 30' 0 1H6250A01 アイスキューバAY 付穴のピッ チとその累 積公差は 0 1 2 Hot Gas Valve Coil Hot Gas Valve Body Drier Shroud Fixing Screw 3 Hook Shroud Condenser Condenser Fixing Screw 4 Air Guide Control Box 5 Control Switch ／ メイショウ (20) アイスキューバAY 山崎 TITLE 野津 (30) UNIT 1) Remove the front panel (lower) and rear panel, move the control switch to the “OFF” C-C 石富 mm 図番 DRAWN DATE SCALE position, andDATEthen unplugREVISIONthe appliance. 1:5 SYMBOL P DESIGNED APPROVED 2020.01.09 石富 1:10 DRAWING No.
2 0 0 2.0 3.0 5.0 10' 5' 5' 20' 10' 10' 1 30' 30' Upper Evaporator Water Supply Pipe Cam Shaft Assy Inlet Water Valve A 普通寸法公差（±）単位mm 角度差（±） 寸法区分 1 4以下 4をこえ 16〃 16〃 63〃 63〃 250〃 250〃 1000〃 1000をこえる 2 M N J 0.05 0.1 0.2 0.3 0.5 0.7 K 0.1 0.2 0.3 0.5 0.7 1.2 L M O 0.2 0.3 0.5 0.7 1.2 2.0 0.3 0.5 0.7 1.2 2.0 3.0 0.5 0.7 1.2 2.0 3.0 5.0 JK LM N 1 1 20' 10' 5' 5' C D No. 0.5 0.7 1.2 2.0 3.0 5.0 1 1 20' 10' 5' 5' 3 2 1 20' 10' 10' 6 3 2 1 30' 30' E PARTS CODE NAME & SPEC.
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” position, and press the “RESET” button. Then, the water tank assembly starts to close. M 0.3 0.5 0.7 1.2 2.0 3.0 N JK LM N 0.5 0.7 1.2 2.0 3.0 5.
Bolt Evaporator Bracket 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 theB-B condenser shroud. 4) Unscrew and pull out the condenser. (The shroud, fan motor and drier come off together with the condenser.
A 普通寸法公差（±）単位mm 角度差（±） 寸法区分 1 4以下 4をこえ 16〃 16〃 63〃 63〃 250〃 250〃 1000〃 1000をこえる J 0.05 0.1 0.2 0.3 0.5 0.7 K 0.1 0.2 0.3 0.5 0.7 1.2 L M O 0.2 0.3 0.5 0.7 1.2 2.0 0.3 0.5 0.7 1.2 2.0 3.0 N JK O LM N 0.5 0.7 1.2 2.0 3.0 5.0 1 1 20' 10' 5' 5' 3 2 1 20' 10' 10' 6 3 2 1 30' 30' B 指示なき取 付穴のピッ チとその累 積公差は C D No. E PARTS CODE NAME & SPEC.
[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. 3) Remove the bearing plate and spring from the water tank assembly.
Bearing Plate Water Plate Switch Switch Bracket Spring Cam (B) Cam Switch Cam Shaft Assy Flange Nut Water Tank Assy Bracket Screw Spring Spacer Cam (A) Actuator Motor Assy Evaporator Screw Plastic Washer Screw Evaporator Base Discharge Hose Pump Motor Lower Evaporator Water Tank Suction Hose 41
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. 2) The cam keeps rotating until the cam switch closes (at the angle of 85° where the cam side touches the water plate), then stops.
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. Water Plate Switch Cam Switch Switch Bracket Bolt Lever Cam Contact when cam opens 85° Bolt [j] Ice Guide 1) Remove the bolts fixing the ice guide assembly to the actuator motor and the rear of the bin. 2) Remove the screws fixing the ice guide shaft.
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. * Spherical ice balls separated from the upper evaporator roll on the ice guide and are led to the bin.
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. Make sure the control switch is in the "OFF" position before plugging in or unplugging the appliance.
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" position for extended periods of time when the water tank is empty. During extended periods of non-use, extended absences, or in sub-freezing temperatures, follow the instructions below.
Icemaker / Ice Storage Bin Drain Outlet 3/4" NPT Icemaker Water Supply Inlet 1/2" NPT Shut-off Valve Vent Tube Minimum 1/4" Nominal ID Copper Water Tubing or Equivalent 1/4" fall per foot Minimum 3/4" Nominal ID Hard Pipe or Equivalent To approved floor drain Drain Valve 2-inch (5-cm) air gap Floor Drain Fig. 3 47 Be sure there is sufficient extra water supply line and drain line for the appliance to be pulled out for service. Separate piping to approved drain.
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. With this in mind, dispose of the product properly.
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 N/A MAXIMUM FUSE SIZE N/A APPROXIMATE ICE PRODUCTION Ambient Water Temp. (°F) PER 24 HR. Temp. (°F) 50 70 90 lbs.
B. Performance Data Pressure data is recorded at 5 min. into freezing cycle. APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day (kg/day) APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day (m3/day) FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG (MPa) SUCTION PRESSURE PSIG (MPa) TOTAL HEAT OF REJECTION Ambient Temp. (°F) 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 Water Temp.
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