Hoshizaki KM-260BWH Service Manual Download

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Control Board

Auxiliary Code

V0 or Earlier

V1 or Later

Part Number

P00013-02

P01771-02

Type

HKM2006V003

Summary of Contents for KM-260BWH

Page 1: ...SERVICE MANUAL HOSHIZAKI SELF CONTAINED CRESCENT CUBER MODEL KM 201BAH KM 260BAH KM 201BWH KM 260BWH NO F015 774 ISSUED MAR 18 2009 REVISED JUN 17 2011 ...

Page 2: ...ice of the product 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 HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Department Phone 1 800 233 1940 Technical Support 770 487 2331 Fax 1 800 843 1056 ...

Page 3: ...1BWH 3 d KM 260BWH 4 II GENERAL INFORMATION 5 1 CONSTRUCTION 5 a KM 201BAH KM 260BAH 5 b KM 201BWH 6 c KM 260BWH 7 d ICEMAKING COMPARTMENT 8 2 SEQUENCE OF OPERATION 9 a ONE MINUTE FILL CYCLE 9 b INITIAL HARVEST CYCLE 9 c FREEZE CYCLE 9 d PUMP OUT CYCLE 9 e NORMAL HARVEST CYCLE 10 f SHUTDOWN 10 3 CONTROL BOARD 12 a CONTROL BOARD LAYOUT 13 b FEATURES 14 c CONTROLS AND ADJUSTMENTS 16 d CONTROL BOARD ...

Page 4: ...L AND REPLACEMENT 45 1 SERVICE FOR REFRIGERANT LINES 45 a SERVICE INFORMATION 45 b REFRIGERANT RECOVERY 46 c EVACUATION AND RECHARGE R 404A 46 2 BRAZING 47 3 COMPRESSOR 48 4 DRIER 49 5 HOT GAS VALVE 50 6 EXPANSION VALVE 52 7 AIR COOLED CONDENSER 53 8 WATER COOLED CONDENSER 54 9 FAN MOTOR AIR COOLED MODEL 55 10 WATER REGULATING VALVE WATER COOLED MODEL 56 11 ADJUSTMENT OF WATER REGULATING VALVE WAT...

Page 5: ...PRAY TUBE WATER SUPPLY PIPE SPRAY GUIDE 70 23 DOOR 71 VI CLEANING AND MAINTENANCE INSTRUCTIONS 72 1 CLEANING 72 a CLEANING PROCEDURE 72 b SANITIZING PROCEDURE 73 2 MAINTENANCE 74 a EXTERIOR PANELS 74 b STORAGE BIN AND SCOOP 74 c AIR FILTER AIR COOLED MODEL 75 d CONDENSER AIR COOLED MODEL 75 3 PREPARING THE ICEMAKER FOR LONG STORAGE 75 iii ...

Page 6: ... WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled Overflow Pipe COOLING WATER CONTROL N A BIN CONTROL SYSTEM Mechanical Level Switch with Delay COMPRESSOR Hermetic Model NF7CLX CONDENSER Air Cooled Fin and tube type EVAPORATOR Vertical type Stainless Steel and ...

Page 7: ... Inlet 1 2 FPT DRAIN Outlet 3 4 FPT CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled Overflow Pipe COOLING WATER CONTROL N A BIN CONTROL SYSTEM Mechanical Level Switch with Delay COMPRESSOR Hermetic Model SC10CL CONDENSER Air Cooled Fin and tube type EVAPORATOR Vertical type Stainless Steel and Copper REFRIG...

Page 8: ...1 2 FPT DRAIN Outlet 3 4 FPT CONDENSER WATER Inlet 1 2 FPT Outlet 1 2 FPT CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled Overflow Pipe COOLING WATER CONTROL N A BIN CONTROL SYSTEM Mechanical Level Switch with Delay COMPRESSOR Hermetic Model NF7CLX CONDENSER Water Cooled Tube type EVAPORATOR Vertical type S...

Page 9: ...Inlet 1 2 FPT DRAIN Outlet 3 4 FPT CONDENSER WATER Inlet 1 2 FPT Outlet 1 2 FPT CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled Overflow Pipe COOLING WATER CONTROL N A BIN CONTROL SYSTEM Mechanical Level Switch with Delay COMPRESSOR Hermetic Model SC10CL CONDENSER Water Cooled Tube type EVAPORATOR Vertical ...

Page 10: ... Leg Side Panel R Power Supply Cord Top Cover Hot Gas Valve Thermistor Drain Valve Evaporator Condenser Fan Motor Cleaning Valve Separator Compressor Water Tank Water Valve Expansion Float Switch Valve Overflow Pipe Drier Pump Motor Control Switch Service Switch Control Box Front View Rear View Bin Control Switch With Tank Removed ...

Page 11: ...Cord Leg Top Cover Drain Valve Hot Gas Valve Cleaning Valve Thermistor Water Regulator Evaporator Condenser Separator Compressor Water Tank Water Valve Expansion Valve Float Switch Overflow Pipe Drier Control Switch Service Switch Control Box Front View Rear View Bin Control Switch With Tank Removed ...

Page 12: ...Cord Leg Top Cover Drain Valve Hot Gas Valve Thermistor Cleaning Valve Water Regulator Evaporator Condenser Separator Water Tank Compressor Expansion Valve Water Valve Overflow Pipe Drier Control Switch Float Switch Service Switch Control Box Front View Rear View Bin Control Switch With Tank Removed ...

Page 13: ...8 d ICEMAKING COMPARTMENT Spray Tube Evaporator Water Supply Pipe Separator Cube Guide Water Tank Overflow Pipe Drain Valve Cleaning Valve Separator Water Valve Pump Motor Float Switch ...

Page 14: ... seconds adjustable by S1 dip switch 7 8 whichever is shorter LED 8 goes off when WV closes PM energizes and runs for the last 0 10 30 or 50 seconds of harvest depending on S1 dip switch 7 8 setting LED 7 comes on when PM energizes At the end of harvest the control board checks the position of F S and proceeds to the freeze cycle if it is closed or calls for a 1 minute fill if it is open c FREEZE ...

Page 15: ...ivated BC open the POWER OK LED flashes There is a delay before the shutdown sequence begins The delay varies depending on the cycle the icemaker is in at the time of activation For details see the table below Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins Fill Cycle 15 seconds Harvest Cycle 15 seconds after the next freeze cycle starts Freeze Cycle 15 seconds if BC is activ...

Page 16: ...the information below for details of each function DRAIN Power is supplied to the pump and drain valve This drains the water tank CIRCULATE Power is supplied to the pump only This operation can be used to circulate cleaner for extended periods of time over the outside surface of the evaporator WASH Power is supplied to the pump and cleaning valve This operation is used to circulate cleaner and san...

Page 17: ...uits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the unit before handling or replacing the board 3 Do not touch the electronic devices on the board or the back of the board to prevent damage to the board 4 Do not change wiring and connections 5 Always replace the whole board assembly if it goes bad 6 Do not short out the power supp...

Page 18: ... PNQ BO PUPS 3FNPUF 3 r 9 3FMBZ SBJO 7BMWF 7 r 9 3FMBZ OMFU 8BUFS 7BMWF 87 87 PO VOJUT XJUI JOMFU XBUFS WBMWFT r POOFDUPS 5SBOTGPSNFS r POOFDUPS BHOFUJD POUBDUPS r 9 3FMBZ 1VNQ PUPS 1 r 9 3FMBZ PU BT 7BMWF 7 BO PUPS JRVJE JOF 7BMWF 7 BOE 7 PGG XIFO PO r 9 3FMBZ OMFU 8BUFS 7BMWF 87 PO VOJUT XJUI JOMFU XBUFS WBMWFT r POOFDUPS 1JOT BO PUPS JRVJE JOF 7BMWF 7 PU BT 7BMWF 1VNQ PUPS OMFU 8BUFS 7BMWF 0QFO...

Page 19: ...down the circuit and the icemaker automatically stops The control board will signal this problem using 1 beep every 3 seconds The alarm reset button on the control board must be pressed with power on to reset the safety d Low Water Safety The control board checks the position of the float switch at the end of the initial one minute water fill cycle and at the end of each harvest cycle If the float...

Page 20: ...ON Sequence Step LED Energized Components Time LEDs are On Min Max Avg 1 Minute Fill Cycle 8 WV 60 seconds Harvest Cycle 5 6 8 WV HGV Comp 2 minutes 20 minutes 3 to 5 minutes Last 0 10 30 or 50 seconds adjustable by dip switch of harvest WV de energizes and PM energizes LEDs 5 6 and 7 are on Freeze Cycle 5 7 Comp PM FMS 5 minutes freeze timer setting 25 to 30 minutes Pump Out Cycle 5 6 4 7 Comp HG...

Page 21: ...r V 0 or earlier KM 201BAH OFF OFF OFF OFF ON ON OFF ON OFF ON KM 260BAH OFF OFF OFF OFF ON ON ON OFF OFF ON KM 201BWH OFF OFF OFF OFF ON ON OFF ON ON OFF KM 260BWH ON OFF OFF OFF ON ON ON OFF OFF ON P01771 02 3 2 V 1 or later KM 201BAH OFF OFF OFF OFF ON ON OFF ON OFF ON KM 260BAH OFF OFF OFF OFF ON ON ON OFF OFF ON KM 201BWH OFF OFF OFF OFF ON ON OFF ON ON OFF KM 260BWH OFF OFF OFF OFF ON ON ON ...

Page 22: ...OFF OFF 60 ON OFF 90 OFF ON 120 ON ON 180 c Pump Out Timer S1 dip switch 3 4 Once every ten freeze cycles the drain valve opens to drain the water tank for the time determined by the pump out timer These switches also determine the time to delay completion of a defrost cycle i e the minimum defrost time Do not change this setting or the unit will not operate properly or produce high quality ice Di...

Page 23: ...arvest pump timer allows the water valve to close and the pump motor to circulate water in the tank during the final part of harvest The water valve is open during harvest for a maximum of 6 minutes or the length of harvest minus 0 10 30 or 50 seconds determined by the harvest pump timer setting whichever is shorter When the water valve closes the pump motor energizes and runs for the time determi...

Page 24: ...arlier Do not adjust These must be left in the factory default position or the unit will not operate properly The anti slush control Ver 1 0 Ver 2 0 helps prevent slushing during the freeze cycle on small icemakers It is deactivated on the KM 201BAH and KM 260BAH When activated Ver 1 0 the thermistor located on the suction line checks for a 34 F 1 C temperature as the evaporator cools When 34 F 1 ...

Page 25: ...te properly The KM 201BAH BWH and KM 260BAH BWH do not refill l Harvest Completion Detection Control S2 dip switch 4 Program Ver 3 2 Do not adjust This must be left in the factory default position or the unit will not operate properly It is deactivated on the KM 201BAH BWH and KM 260BAH BWH When activated this control determines whether ice remains on the evaporator at the end of a harvest cycle a...

Page 26: ... cycle time and a harvest cycle starts S2 Dip Switch Setting Overfreeze Detection Control No 5 OFF Deactivated ON Activated n Anti Slush Control S2 dip switch 6 Program Ver 3 2 Do not adjust This must be left in the factory default position or the unit will not operate properly When activated Ver 1 1 the thermistor located on the suction line checks for a 41 F 5 C temperature as the evaporator coo...

Page 27: ...n beginning with the 1 minute fill cycle e CONTROL BOARD REPLACEMENT The dip switches should be adjusted to the factory default settings as outlined in this manual 4 THERMISTOR A thermistor semiconductor is used as a harvest control sensor and anti slush sensor The resistance varies depending on the suction line temperatures The thermistor detects the temperature of the evaporator outlet to start ...

Page 28: ...ng the freeze cycle ice pushes in the lever after the five minute timer expires the control board will allow the machine to complete the freeze cycle and the following harvest cycle before shutting down the machine When the bin control is activated the POWER OK LED flashes There is a delay before the shutdown sequence begins The delay varies depending on the cycle the icemaker is in at the time of...

Page 29: ...eration They are located on the right side of the control box which becomes accessible when the front louver is removed The upper is the control switch and the lower is the service switch a CONTROL SWITCH This switch is used to place the machine into one of three modes OFF center position ICE upper position and SERVICE lower position b SERVICE SWITCH When the control switch is in the SERVICE posit...

Page 30: ...r the outside surface of the evaporator c WASH This machine utilizes a solenoid operated wash bypass valve When the service switch is active and placed in the WASH position power is supplied to the pump and cleaning valve This operation is used to circulate cleaner and sanitizer over both the inside and outside of the evaporator Fig 3 Control Switch Service Switch SERVICE ICE OFF DRAIN WASH CIRCUL...

Page 31: ...Fan Condenser Expansion Valve Compressor Access Valve Strainer Hot Gas Valve High Pressure Switch Refrigerant Circuit Water Circuit Discharge Line Insulation Tube Pump Motor Water Tank Drain Drain Valve Cleaning Valve III TECHNICAL INFORMATION 1 WATER CIRCUIT AND REFRIGERANT CIRCUIT a KM 201BAH KM 260BAH ...

Page 32: ...ermistor Suction Line Water Supply Water Valve Spray Tube Water Condenser Expansion Valve Compressor Access Valve Strainer Hot Gas Valve High Pressure Switch Refrigerant Circuit Water Circuit Discharge Line Insulation Tube Pump Motor Water Tank Drain Drain Valve Water Supply Water Regulator ...

Page 33: ...28 2 WIRING DIAGRAM ...

Page 34: ... GAS VALVE WATER VALVE ON OFF FAN MOTOR ON OFF OFF CLEANING VALVE ON OFF FLOAT SWITCH ON OFF BIN CONTROL SWITCH ON OFF RELAY X4 WV ON ON OFF ON OFF ON OFF OFF ON OFF ON OFF CONTROL BOARD RELAY X6 DV RELAY X1 COMP RELAY X2 HV FM ON RELAY X3 PM OFF Program Ver 2 5 or earlier Auxiliary Code V 0 or earlier ON OFF PUMP MOTOR Program Ver 3 2 or later Auxiliary Code V 1 or later ON POWER SWITCH ON FREEZE...

Page 35: ...E CYCLE HARVEST CYCLE BIN FULL HOT GAS VALVE FAN MOTOR ON OFF ON Program Ver 2 5 or earlier Auxiliary Code V 0 or earlier ON OFF WATER VALVE ON OFF CLEANING VALVE ON OFF DRAIN VALVE FLOAT SWITCH ON RELAY X4 WV ON ON OFF ON OFF ON OFF OFF ON OFF ON OFF CONTROL BOARD RELAY X6 DV RELAY X1 COMP RELAY X2 HV FM ON RELAY X3 PM OFF OFF BIN CONTROL SWITCH ON OFF OFF PUMP MOTOR Program Ver 3 2 or later Auxi...

Page 36: ... ON OFF FLOAT SWITCH ON OFF BIN CONTROL SWITCH ON OFF RELAY X4 WV ON ON OFF ON OFF ON OFF OFF ON OFF ON OFF CONTROL BOARD RELAY X6 DV RELAY X1 COMP RELAY X2 HV FM ON RELAY X3 PM OFF FAN MOTOR ON OFF ON Program Ver 2 5 or earlier Auxiliary Code V 0 or earlier ON OFF PUMP MOTOR Program Ver 3 2 or later Auxiliary Code V 1 or later POWER SWITCH ON HARVEST CYCLE FREEZE CYCLE HARVEST CYCLE INITIAL OFF P...

Page 37: ...OFF CONTROL BOARD RELAY X6 DV RELAY X1 COMP RELAY X2 HV FM FAN MOTOR ON OFF ON Program Ver 2 5 or earlier Auxiliary Code V 0 or earlier ON OFF PUMP MOTOR Program Ver 3 2 or later Auxiliary Code V 1 or later OFF FREEZE CYCLE HARVEST CYCLE Thermistor senses 9 C after more than 8 min 50 sec in harvest cycle Ver 3 1 or later ON HARVEST CYCLE FREEZE CYCLE HARVEST CYCLE INITIAL OFF ON OFF 9 C 5 C POWER ...

Page 38: ...54 3 8 80 27 52 3 7 54 3 8 56 3 9 90 32 52 3 7 56 3 9 58 4 0 PSIG kg cm2 G 100 38 53 3 7 56 4 0 59 4 1 Note Pressure data is recorded at 5 minutes into freezing cycle The data not in bold should be used for reference only We reserve the right to make changes in specifications and design without prior notice 26 27 30 2 0 3 2 2 5 2 8 2 4 2 0 2 9 25 APPROXIMATE ICE PRODUCTION PER 24 HR APPROXIMATE EL...

Page 39: ...5 70 21 51 3 6 52 3 7 54 3 8 80 27 52 3 7 54 3 8 56 3 9 90 32 52 3 7 56 3 9 58 4 0 PSIG kg cm2 G 100 38 53 3 7 56 4 0 59 4 1 Note Pressure data is recorded at 5 minutes into freezing cycle We reserve the right to make changes in specifications and design without prior notice 27 27 30 2 0 3 2 2 5 2 8 2 4 2 0 2 9 25 APPROXIMATE ICE PRODUCTION PER 24 HR APPROXIMATE ELECTRIC CONSUMPTION APPROXIMATE WA...

Page 40: ...te Pressure data is recorded at 5 minutes into freezing cycle The data not in bold should be used for reference only We reserve the right to make changes in specifications and design without prior notice WATER FLOW FOR CONDENSOR 䇭䇭 27 gal h AT 100ºF 38㷄 WT 90ºF 32㷄 PRESSURE DROP OF COOLING WATER LINE 㫃㪼㫊㫊㩷㫋㪿㪸㫅㩷㪈㪇㩷㪧㪪㪠㪞 23 23 25 2 0 2 5 2 2 2 4 2 2 2 0 2 4 22 APPROXIMATE ICE PRODUCTION PER 24 HR APP...

Page 41: ...G 100 38 49 3 4 49 3 5 58 4 1 Note Pressure data is recorded at 5 minutes into freezing cycle We reserve the right to make changes in specifications and design without prior notice 22 22 23 2 1 2 6 2 3 2 5 2 3 2 1 2 5 21 APPROXIMATE ICE PRODUCTION PER 24 HR APPROXIMATE ELECTRIC CONSUMPTION APPROXIMATE WATER CONSUMPTION PER 24 HR FREEZING CYCLE TIME WATER TEMP ºF ºC AMBIENT TEMP ºF ºC 50 10 70 21 9...

Page 42: ...n during initial start up and at the end of each harvest Diagnosis If the water valve does not open check for no supply voltage at water valve terminals bad coil or plugged screen or external filter no water flow If unit fails to start harvest check for open float switch or bad 1 minute timer in board 4 Initial Harvest Cycle The inlet water valve remains energized contactor coil energizes to start...

Page 43: ...model and conditions Cycle times and pressures should follow performance data provided in this manual 6 Pump Out Cycle The compressor remains energized the hot gas valve energizes the fan motor de energizes The drain valve and pump motor energize allowing water to drain from the tank for 10 seconds This removes contaminants from the water tank Diagnosis If the drain valve does not open check the c...

Page 44: ...ce g Wiring to Control Board 1 Loose connections or open 1 Check for continuity and replace h Thermistor 1 Leads shorted or open and high temperature safety operates If open unit will start but have long harvest cycle 1 See II 4 THERMISTOR i Hot Gas Solenoid Valve 1 Continues to open in freeze cycle and high temperature safety operates 1 Check for power off in freeze cycle and replace 1 Water supp...

Page 45: ... b High Pressure Control 6 Refrigerant line or components plugged 6 Clean and replace drier 1 Bad contacts 1 Check for continuity and replace 2 Voltage too low 2 Increase voltage c Overload Protector 3 Refrigerant overcharged or undercharged 3 Recharge 1 Bad contacts 1 Check and replace d Starter 2 Coil winding opened 2 Replace e Start Capacitor 1 Defective 1 Replace 1 Bad contacts 1 Check for con...

Page 46: ...nnection or open and replace 4 Defective capacitor 4 Replace d Pump Motor 5 Defective or bound impeller 5 Replace and clean 5 No water comes from Spray Tubes Water Pump will not start or freeze cycle time is too short e Control Board 1 Defective 1 See II 3 d CONTROL BOARD CHECK PROCEDURE 1 Motor winding opened 1 Replace 2 Bearing worn out 2 Replace 3 Wiring to fan motor 3 Check for loose connectio...

Page 47: ... Thermistor 1 Out of position or loose attachment 1 See V 17 THERMISTOR 1 Harvest timer is set too short 1 Adjust longer referring to II 4 THERMISTOR 2 All ice formed on Evaporator does not fall into bin in harvest cycle f Control Board 2 Defective 2 See II 3 d CONTROL BOARD CHECK PROCEDURE 1 Clogged 1 Clean a Spray Tubes 2 Out of position 2 Place in position b Water System 1 Dirty 1 Clean c Refri...

Page 48: ...ter valve 5 ABNORMAL ICE PROBLEM POSSIBLE CAUSE REMEDY a Cube Guide Water Tank 1 Out of position Circulated water falls into bin 1 Check that cube guide is properly installed on water tank and tank is fixed securely with snaps 1 Small cubes b See chart 2 5 and check water supply line inlet water valve water system pump motor and control board a See chart 3 1 and 3 and check float switch inlet wate...

Page 49: ...cemaker will not stop when bin is filled with ice b Control Board 1 Defective 1 See II 3 d CONTROL BOARD CHECK PROCEDURE a Pump Motor 1 Bearings worn out 1 Replace 1 Bearings worn out 1 Replace 2 Fan blade deformed 2 Replace fan blade b Fan Motor 3 Fan blade does not move freely 3 Replace 1 Bearings worn out or cylinder valve broken 1 Replace c Compressor 2 Mounting pad out of position or loose ho...

Page 50: ... requiring the refrigeration circuit to be opened must be performed by properly trained and EPA certified service personnel 2 Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere 3 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 t...

Page 51: ... be used for evacuation and refrigerant charge should be exclusively for POE oils 2 Turn on the vacuum pump Open the gauge manifold valves Never allow the oil in the vacuum pump to flow backwards 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 4 Close the low side valve and high side valve on the gauge manifold 5 Disconnect the gauge manifold hos...

Page 52: ...for leaks Add a trace of refrigerant to the system 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 1 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do no...

Page 53: ... or disconnect the power source 2 Remove the top panel and rear 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 terminal cover on the compressor and disconnect solderless terminals 5 Disconnect the discharge and suction pipes using brazing equipment 6 Remove the hold down bolts washers and rubber grommets...

Page 54: ... after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 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 1 Unplug the icemaker or disconnect the power source 2 Remove the top panel and rear panel 3 Recover the refrigerant an...

Page 55: ...not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 4 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 1 Unplug the icemaker or disconnect the power source 2 Remove the top panel rear panel and s...

Page 56: ...r see 4 DRIER 9 Check for leaks using nitrogen gas 10 bar and soap bubbles 10 Evacuate the system and charge it with refrigerant see 1 c EVACUATION AND RECHARGE 11 Attach the solenoid coil to the valve body and secure it with the screw 12 Connect the lead wires 13 Refit the panels in their correct positions 14 Plug in the icemaker or connect the power source Fig 4 Hot Gas Valve ...

Page 57: ... cloths or similar 5 Remove the insulation hose from the expansion valve sensor bulb and remove the bulb 6 Remove the drier using brazing equipment 7 Braze in the new expansion valve Protect the body of the valve from excessive heat and use nitrogen at a pressure of 0 2 0 3 bar when brazing 8 Install the new drier see 4 DRIER 9 Check for leaks using nitrogen gas 10 bar and soap bubbles 10 Evacuate...

Page 58: ...new drier with the arrow on the drier in the direction of the refrigerant flow 3 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 1 Unplug the icemaker or disconnect the power source 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Disconnect the condenser inlet and outlet pip...

Page 59: ...8 WATER COOLED CONDENSER CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the ...

Page 60: ... system 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 13 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 14 Close the drain valve s Open the condenser water supply line shut off valve If connected to a closed loop water supply ...

Page 61: ...opened 2 Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 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 1 Unplug the icemaker or disconnect the power source 2 Remove the panels 3 Close...

Page 62: ...he bracket 11 Install the new valve 12 Remove the drier then place the new drier in position 13 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 14 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 nitrogen gas 140 PSIG DO NOT use R...

Page 63: ...essure gauge to the high side line of the system 2 Five minutes after a freeze cycle starts confirm that the thermometer reads 104 F to 115 F 40 C to 46 C If it does not rotate the adjustment screw by using a flat blade screwdriver until the temperature is in the proper range See Fig 7 Next check that the reference pressure is in the range indicated in the Head Pressure table See III 4 PERFORMANCE...

Page 64: ...e band connecting the pump motor discharge outlet and pull off the rubber hose Fig 8 6 Remove the screws securing the pump motor and lift it off Hose Band Rubber Hose 7 Install the new motor in the reverse order of the removal procedure 8 Refit the water tank in its correct position 9 Plug in the icemaker or connect the power source and check for leaks 10 Refit the panels in their correct position...

Page 65: ...ter coming out 7 Turn the inlet nut in the arrow direction to remove it from the water valve Do not lose the gasket inside 8 Remove the two mounting screws 9 Install the new valve in the reverse order of the removal procedure 10 Tighten the inlet nut to a torque of 7 85 N m 5 to prevent water leaks 11 Open the water supply tap 12 Plug in the icemaker or connect the power source 13 Check for leaks ...

Page 66: ... hose clamps at the inlet and outlet sides 6 Remove the rubber hoses at the inlet and outlet sides 7 Remove the two mounting screws 8 Install the new valve in the reverse order of the removal procedure 9 Open the water supply tap 10 Plug in the icemaker or connect the power source 11 Check for leaks 12 Refit the panels in their correct positions Fig 11 Drain Valve Mounting Screw Mounting Screw Cle...

Page 67: ...l and side panel R 3 Disconnect the connector of the float switch lead 4 Remove the two mounting screws 5 Install the new float switch in the reverse order of the removal procedure 6 Refit the panels in their correct positions 7 Plug in the icemaker or connect the power source Fig 12 Float Switch Lift off ...

Page 68: ...he connector of the bin control switch lead black covered with a silicone hose and remove the lead wire from the grommet 4 Loosen the thumbscrew on the right side 5 Remove the thumbscrew on the left side Shift the bin control switch to the left to remove 6 Refit the removed parts in the reverse order of the removal procedure 7 Plug in the icemaker or connect the power source Fig 14 Remove Loosen S...

Page 69: ...s Do not use any sealant other than the above 8 Attach the new thermistor in position on the suction pipe and press down the thermistor holder over the thermistor Be careful not to damage the thermistor lead Cover the parts with the insulation and secure them with the ties Keep the thermistor inside the thermistor holder After the thermistor holder is fitted do not pull the thermistor lead to move...

Page 70: ...oved parts in the reverse order of the removal procedure Note After replacing the components inside the control box connect and tie the wires properly in their correct position Especially make sure that the harness does not press the push buttons on the control board Fig 16 Screw Control Box Power Relay Transformer Control Board Power Switch Fuse Fuse Holder Pull toward you ...

Page 71: ...g the fuse holder 2 Install the new fuse holder in the reverse order of the removal procedure d CONTROL BOARD 1 Disconnect all the connectors 2 Pull the tab to release the control board 3 Lift off the control board 4 To refit the control board fit its four corner holes on the positioning lugs inside the control box and secure the control board with the tab 5 Check the dip switch for proper setting...

Page 72: ...er of the removal procedure 19 WATER TANK 1 Drain out the water tank by leaving the control switch in the SERVICE position and the service switch in the DRAIN position for several tens of seconds 2 Unplug the icemaker or disconnect the power source Remove all ice from the storage bin 3 Disconnect the overflow pipe 4 Remove the two thumbscrews Pull the water tank slightly toward you and push it dow...

Page 73: ...cal Flange Notch Stopper 21 SEPARATOR IMPORTANT 1 The front separator and rear separator are attached to the evaporator bracket with different lengths of pins The front separator pins 12 7 mm are longer than the rear separator pins 9 8 mm Do not misplace the front and rear separators 2 Do not attach the separators upside down or inside out Make sure that the side printed with THIS SIDE UP faces up...

Page 74: ...of the evaporator bracket toward the center See Fig 19 Note Be careful not to break the pins 6 The rear separator is hooked on the groove in the evaporator bracket Remove the rear separator by lifting it up and down See Fig 19 7 Refit the separators in the reverse order of the removal procedure Check that the separators are fit correctly and can swing like a pendulum 8 Plug in the icemaker or conn...

Page 75: ...pray pipe and spray guide from the evaporator plate See Fig 20 6 Refit the removed parts in the reverse order of the removal procedure Check for water leaks IMPORTANT Fit the spray guide securely and tightly on the evaporator fin Otherwise cloudy or irregular ice cubes or performance reduction may be caused 7 Plug in the icemaker or connect the power source Fig 20 Silicone Hose Spray Tube Spray Gu...

Page 76: ...Open the door 2 Unscrew and remove the hinges on both sides and remove the door 3 Refit the removed parts in the reverse order of the removal procedure Check that the door opens and closes smoothly Fig 21 Door Hinge ...

Page 77: ...d maximum effectiveness use cleaning and sanitizing solutions immediately after dilution a CLEANING PROCEDURE 1 Dilute 5 fl oz 148 ml of recommended cleaner Hoshizaki Scale Away or LIME A WAY Economics Laboratory Inc with 1 gal 3 8 lit of water 2 Remove the louver Open the door and remove all ice from the evaporator and the storage bin Note To remove cubes on the evaporator move the control switch...

Page 78: ...move them from the water tank They are snapped in place See Fig 18 16 Same as step 1 17 Wash the bin control switch water tank float switch cube guide and overflow pipe by using a nylon scouring pad brushes and the cleaning solution In addition to the removed parts also wash the bin liner and bracket L R with the solution 18 Discard the cleaning solution and rinse the parts thoroughly with water b...

Page 79: ...hree times to rinse thoroughly 12 Flush the storage bin with water 13 Move the control switch to the ICE position and start the automatic icemaking process 14 Close the door Replace the louver in its correct position 2 MAINTENANCE a EXTERIOR PANELS To prevent corrosion wipe the exterior occasionally with a clean and soft cloth Use a damp cloth containing a neutral cleaner to wipe off all oil or di...

Page 80: ...water lines and remove the ice from the storage bin The storage bin should be cleaned and dried Drain the icemaker using air or carbon dioxide to prevent damage to the water supply lines at sub freezing temperatures Shut off the icemaker until the proper ambient temperature is resumed When the icemaker is not used for two or three days it is sufficient to only move the control switch to the OFF po...

Page 81: ...ol switch to the OFF position 3 Open the door Remove all ice from the storage bin and clean the storage bin 4 Close the door 5 Replace the louver in its correct position 6 Turn off the power supply at the breaker box Fig 22 Inlet Hose Washer Stop Valve ...

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Hoshizaki KM-260BWH, Service Manual

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Summary of Contents for KM-260BWH

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