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Hoshizaki IM-500SAB, Service Manual

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Hoshizaki IM-500SAB Service Manual Download Page 19

19

Low Ice Production - Possible Cause

Long Harvest Cycle

1. Evaporator

a) Scaled up.

2. Control Board

a) Thermistor connection loose (K3).
b) Defective.

3. Evaporator (Cube Control)

Thermistor
See "II.E. Evaporator Thermistor 
Check"

a) Loose, disconnected, or defective.

4. Hot Gas Valve

a) Erratic or closed.

5. Compressor

a) Inefficient or off.

6. Thermostatic Expansion Valve

a) Defective.

7. Refrigerant Charge

a) Low.

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. Thermostatic Expansion Valve

a) Bulb loose.
b) Defective.

6. Compressor

a) Inefficient or off.

7. Refrigerant Charge

a) Low. 

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.

Imperfect Ice Production - Possible Cause

1. Water Supply

a) Improper water pressure.
b) External water filters restricted.
c) Water leaks from water tank or water plate due to broken tank or 

plate or icemaker out of level.

2. Inlet Water Valve

a) Water leaks from valve body or water supply pipe joint.

3. Water Plate

a) Spray holes restricted.

4. Pump Motor

a) Defective.

Summary of Contents for IM-500SAB

Page 1: ...Models IM 500SAB Stackable Square Cuber Service Manual Number 73241 Issued 8 28 2019 hoshizakiamerica com ...

Page 2: ...improper installation is not covered under warranty Hoshizaki provides this manual primarily to assist qualified service technicians in the service of the appliance 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 Fa...

Page 3: ...Operation Flow Chart 8 B Service Diagnosis 9 C Control Board Check 14 D Bin Control Check 15 E Evaporator Thermistor Check 17 F Control Switch 17 G Diagnosis Table 18 H Freeze Up Check List 21 III Controls and Adjustments 22 A Control Board 22 B Control Board Buttons 24 C Control Board Settings 25 D Control Board Information Display 28 E Control Board Model Code Setting 30 F Error Codes 31 G Quick...

Page 4: ... to meet these code requirements could result in death electric shock serious injury fire or damage to the appliance Electrical connection must be hard wired and must meet national state and local electrical code requirements Failure to meet these code requirements could result in death electric shock serious injury fire or severe damage to the appliance The icemaker requires an independent power ...

Page 5: ...he instructions in this manual carefully to reduce the risk of costly water damage In areas where water damage is a concern install in a contained area with a floor drain Install the appliance in a location that stays above freezing Normal operating ambient temperature must be within 45 F to 100 F 7 C to 38 C Do not leave the appliance on during extended periods of non use extended absences or in ...

Page 6: ...ostatic Expansion Valve Water Plate Evaporator Inlet Water Valve Pump Motor Actuator Motor Drain Pan Control Box Drier Compressor Fan Motor Condenser High Pressure Switch Hot Gas Valve Control Board Thermistor I Construction and Water Refrigeration Circuit Diagram A Construction 1 Air Cooled Model SAB ...

Page 7: ...ram 1 Air Cooled Model SAB Thermostatic Expansion Valve Evaporator Evaporator Thermistor Water Tank Water Pump Condenser Drier Fan Motor Compressor Strainer Hot Gas Valve Inlet Water Valve Water Circuit Refrigerant Circuit Heat Exchanger ...

Page 8: ...nergized Water Tank Open ET ET 41 F 5 C CB Setting 1 PM energized Comp continues FM continues WV energized 4 5 Water Tank Closed AMPS If CBTh 81 F 27 C CB Setting 74 and CBTh 111 F 44 C CB Setting 70 HGV energizes 5 sec de energizes 25 sec energizes 5 sec CB Setting 71 72 ET 1 3 F 18 5 C CB Setting 2 Note CB Setting Power On Startup Initial Harvest and Initial Freeze Bin Control Startup Initial Ha...

Page 9: ...ave fallen into the dispenser unit ice storage bin Make sure all food zones in the appliance and dispenser unit ice storage bin are clean after service The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components Before proceeding check for correct installation proper voltage per nameplate and adequate water supply Check CB using the steps in II D C...

Page 10: ...k for 115VAC at HPS R to neutral W then HPS LBU to neutral W If 115VAC is present at HPS R and not at HPS LBU HPS is open See HPS Diagnosis below If 115VAC is present at HPS LBU check for 10 5VAC at CB CN1 1 red wire to CB CN1 2 red wire If 10 5VAC is not present check CT continuity If open replace CT If 10 5VAC is present and on is not on CB display replace CB b HPS Diagnosis Confirm condenser co...

Page 11: ...ontacts are closed If not replace CR If CR contacts are closed check Comp external protector Comp start and run capacitors Comp start relay and Comp motor winding b HGV Diagnosis If Comp is energized and evaporator is not warming check that HGV energizes and opens Check for 115VAC at CB CN3 3 P to neutral W If 115VAC is not present replace CB If 115VAC is present check for 115VAC at HGV coil and c...

Page 12: ...efrigerant charge is correct See VIII A Specification and Performance Data Note Refrigerant gauges should not be placed on the icemaker until all other components have been confirmed c Comp Diagnosis If Comp is not energized check for 115VAC at CB CN3 9 O If 115VAC is present check for 115VAC at CR coil If 115VAC is present check CR coil and contact continuity Replace as needed If CR is okay check...

Page 13: ...evaporator 4 Harvest Cycle Same as the initial harvest cycle Return to step 2 above Note Appliance continues to cycle until BC is satisfied or power is switched off The appliance always restarts at the startup cycle 2 Shutdown Diagnosis 1 When BC is engaged open for more than 10 seconds the icemaker shuts down after harvest cycle When BC is disengaged closed for more than 80 seconds icemaker resta...

Page 14: ... check for 115VAC at CS terminal 2 DBU to neutral W If 115VAC is not present check 5A fuse continuity If 115VAC is present check for 115VAC at CS terminal 1 R to neutral W If 115VAC is not present replace CT If 115VAC is present check for 115VAC at HPS LBU to neutral W If 115VAC is not present see II B 1 1 b HPS Diagnosis If 115VAC is present and secondary circuit does not have proper voltage repl...

Page 15: ...ddle is engaged BC switch is open If closed check that the actuator paddle is not restricted Clean if necessary See II D 2 Bin Control Cleaning If BC switch still reads closed replace BC 8 Reconnect BC wire harness connector to CB CN11 connector then move the control switch to the ICE position Turn on the power supply 9 Allow the icemaker to cycle on Press and hold the actuator paddle for at least...

Page 16: ...ing 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 7 Reassemble BC and replace it in its correct position Note If the magnet was removed for cleaning be sure to replace it in its correct position 8 Replace the BC cable into the cable ties in the evapo...

Page 17: ...ponent Service Information If within the normal range continue to the next step 7 Replace the thermistor in its correct position See IV B Component Service Information 8 Reconnect the thermistor connector to CB CN13 connector 9 Replace the control box cover in its correct position 10 Move the control switch to the ICE position 11 Replace the front panel in its correct position 12 Turn on the power...

Page 18: ...ol Check and Cleaning a Tripped with bin filled with ice b Actuator does not move freely c Defective 8 Water Supply a Water supply off or improper water pressure b External water filters restricted 9 Inlet Water Valve a Screen or orifice restricted b Coil winding open 10 Compressor a Compressor relay magnetic contactor contacts bad or coil winding open b Start capacitor or run capacitor defective ...

Page 19: ... Thermostatic Expansion Valve a Bulb loose b Defective 6 Compressor a Inefficient or off 7 Refrigerant Charge a Low 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 Imperfect Ice Production Possible...

Page 20: ...e a Low Large Hole Cubes Possible Cause Also see III G 1 Dimple Diameter 4 Icemaker Location a Insufficient clearance b Ambient temperature too high 5 Water Supply a Water leaks b Improper water pressure Cloudy Cubes Possible Cause 1 Water Quality a High hardness See III G 2 Ice Clarity 2 Slush Ice a Use Anti Slush Control Control Board Settings 50 and 51 ...

Page 21: ...tor springs in place 12 Are actuator cam A and Cam B in their correct positions 13 Is the bin control properly mounted and secured 14 Is the evaporator thermistor properly mounted tight and insulated 15 Is the TXV bulb properly mounted tight and insulated wrapped 16 Is there an error code on the control board display if so what error code ___________ Appliance Operation Startup YES NO 17 Does the ...

Page 22: ...s integrated circuits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the icemaker when handling or replacing the control board Do not touch the electronic devices on the control board or the back of the control board Do not change wiring and connections Do not short out power supply to test for voltage Always replace the whole control...

Page 23: ...Connector Data Input Output CN1 Connector Control Transformer 10 5VAC Input CN5 Connector Actuator Motor Output CN3 Connector 115VAC Output Pump Motor Hot Gas Valve Fan Motor Inlet Water Valve Compressor Relay F1 Fuse 5A 250VAC CN2 Connector 115VAC Input RESET Button SERVICE 1 Button SERVICE 2 Button CN9 Connector Display Output Control Board Part Number P01873 01 Version 1 3A or Later 1 Control B...

Page 24: ...2 Buttons Press the SERVICE 1 or SERVICE 2 button briefly to display the current freeze cycle termination temperature Control Board Setting 2 This setting controls dimple diameter For details about adjusting the dimple diameter see III G 1 Dimple Diameter NOTICE Do not decrease dimple size below 3 16 5 mm Press and hold the SERVICE 1 button for 3 seconds to enter information display and model code...

Page 25: ... 0 C To use this setting for dimple size adjust ment see III G 1 Dimple Diameter 5 to 40 C 0 5 C increments The in the lower right corner of the display indicates 5 C 18 5 3 Freeze Cycle Termination Time Integrated with freeze cycle termination temperature CB Setting 2 to control length of freeze cycle after evaporator cube control thermistor temperature drops to 32 F 0 C 5 to 90 min 1 min increme...

Page 26: ...ings 12 and 15 to the full drain times listed in this table and move the water tank drain pipe to the drain position For details see III G 2 Ice Clarity Partial 1 Full 0 1 15 Freeze Cycle Water Supply Time 2 Partial Drain CB Setting 14 0 to 90 sec 1 sec increments 22 Freeze Cycle Water Supply Time 2 Full Drain CB Setting 14 44 Other 21 Stackable Bin Control Allows for stacked units to be controlle...

Page 27: ...rity 0 to 90 sec 1 sec increments 0 Water Tank Ice Control 70 71 72 74 If control board thermistor temperature is above the water tank ice control lower temperature setting CB Setting 74 and equal to or less than the water tank ice control upper temperature setting CB Set ting 70 when freeze cycle termination temperature CB Setting 2 is met the hot gas valve energizes de energizes energizes for th...

Page 28: ...s 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 Item Description History Cleared by Pressing and Holding SERVICE 1 and SERVICE 2 Buttons Simultaneously for 5 Sec when Item Value is Displayed n1 Freeze Cycle Time During Freeze Cycle Time since freeze cycle started After Freeze Cycle Time of previous freez...

Page 29: ...unter updates every 10 freeze cycles Freeze cycles interrupted by bin control shutdown or the RESET button are not recorded No h4 Error Log Displays up to 5 errors with the most recent error first For error details see III F Error Codes For example E5 most recent E4 E3 E2 E1 least recent of up to 5 errors displays as fol lows E5 off E4 off E3 off E 2 off E1 off repeat Yes h5 Firmware Version Displ...

Page 30: ... 3 Disconnect all the connectors from the control board 4 Remove the old control board and install the new control board P01873 01 Version 1 3A or Later 5 Connect the connectors to the new control board 6 Replace the control box cover in its correct position 7 Turn on the power supply then move the control switch to the ICE position 8 00 appears in the display of the new control board 9 Press the ...

Page 31: ... actual error code see the error log 1 With the 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 until h4 is displayed 3 Press the RESET button to view the error log Displays up to 5 errors with the most recent error first 4 Press the RESET button to return to list To clear error log history press and...

Page 32: ...tton to reset EE E5 High Evaporator Temperature If evaporator temperature 140 F 60 C or higher for 5 sec unit stops Check for harvest problem stuck HGV or control board relay hot water entering unit or shorted thermistor Press the RESET button to reset EE E9 Condenser Thermistor Error If condenser thermistor is open or shorted for 2 sec unit stops Note IM 500SAB does not utilize a condenser thermi...

Page 33: ... is 18 5 C For reference raising freeze cycle termination temperature setting to 13 C will result in a dimple diameter of approximately 3 8 10 mm 4 Once the display returns to on 20 seconds the new setting is saved b To decrease dimple diameter 1 Remove front panel 2 Press the SERVICE 2 button to view the current freeze cycle termination temperature setting 3 Press the SERVICE 2 button to lower fr...

Page 34: ...ERVICE 2 buttons to change the setting to 60 7 Press the RESET button to save the setting and return to the menu 8 Using the same procedure as above change the full partial drain setting Control Board Setting 14 from 1 partial drain to 0 full drain 9 Using the same procedure as above change the additional icemaking water supply time setting Control Board Setting 15 to 44 10 Once the display return...

Page 35: ...tem 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 NOTICE Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere Do not leave the system open for longer than 15 min when replacing or servicing parts The Polyol Ester PO...

Page 36: ... the new drier with the arrow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 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 ...

Page 37: ...alves to prevent a possible leak B Component Service Information NOTICE When replacing a component listed below see the notes to help ensure proper operation Component Notes Compressor Install a new start capacitor run capacitor and start relay Thermostatic Expansion Valve Attach the thermostatic expansion valve bulb to the suction line in the same location as the previous bulb The bulb should be ...

Page 38: ...le Frequency Area Task Daily Scoop Clean the ice scoop using a neutral cleaner Rinse thoroughly after cleaning Bi Weekly Air Filters Inspect Wash with warm water and neutral cleaner if dirty Monthly External Water Filters Check for proper pressure and change if necessary Icemaker Exterior Wipe down with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build ...

Page 39: ...supply line shut off valve and open the icemaker water supply line drain valve 4 Allow the icemaker water supply line to drain by gravity 5 Attach compressed air or carbon dioxide supply to the icemaker water supply line drain valve 6 Move the control switch to the ICE position and turn on the power supply 7 Blow the icemaker water supply line out using compressed air or carbon dioxide 2 Drain the...

Page 40: ...posal 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 ...

Page 41: ...70 21 117 0 44 111 0 42 102 0 39 80 27 112 0 43 102 0 39 94 0 36 90 32 111 0 42 95 0 36 87 0 33 gal day m3 day 100 38 101 0 38 93 0 35 79 0 30 70 21 80 27 90 32 min 100 38 70 21 80 27 90 32 min 100 38 70 21 209 14 7 233 16 4 257 18 1 80 27 227 16 0 264 18 6 284 20 0 90 32 233 16 4 290 20 4 312 22 0 PSIG kg cm2 G 100 38 235 16 5 295 20 8 333 23 4 70 21 47 3 3 49 3 5 52 3 7 80 27 49 3 4 52 3 7 55 3 ...

Page 42: ...42 B Wiring Diagram 1 IM 500SAB ...

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