Hoshizaki

1 Hoshizaki A Superior Degreeof Reliability Crescent CuberHoshizaki America, : 73146 Issued: 1-2-2007 SERVICE MANUAL IMPORTANTOnly qualified service technicians should attempt to install, service or maintain this icemaker. No installation, 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 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 AMERICA, 8 Highway 74 SouthPeachtree City, GA 30 69 Attn: Hoshizaki Technical Support DepartmentPhone: -800- 33- 940 Technical Service (770) 487- 33 Fax: -800-843- 056 (770) 487-3360E-mail: Site: : To expedite assistance, all correspondence/communication MUST include the following information.

2 Model Number Serial Number Complete and detailed explanation of the problem 3 Please review this manual. It should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should service and maintain the icemaker. This manual should be made available to the technician prior to service or Specifications ..5A. Icemaker ..5 . KM- 55 BAH (air-cooled) ..5 . KM- 55 BWH (water-cooled) ..6II. General Information ..7A. Construction ..7 . KM- 55 BAH (air-cooled) ..7 . KM- 55 BWH (water-cooled) ..8B. Sequence of Operation ..9 . One Minute Fill Cycle ..9 . Initial Harvest Cycle ..93. Freeze Cycle.

3 94. Normal Harvest Cycle ..9C. Control Board .. Control Board Layout .. 3 . Features .. 4a) Maximum Water Supply Period 6 minutes .. 4b) Harvest Backup Timer and Freeze Timer .. 4c) High Temperature Safety .. 4d) Low Water Safety .. 4e) High Voltage and Low Voltage Cut-outs .. 4f) LED Lights and Audible Alarm Safeties .. 53. Controls and Adjustments .. 6a) Default Dip Switch Settings .. 6b) Harvest Control Thermistor .. 6c) Harvest Timer (S4 dip switch & ) .. 7d) S4 dip switch 3, 4, 5, 6, 7, & 8 .. 7e) Freeze Timer (S4 dip switch 9 & 0).. 7f) Float Switch Control and Refill Counter (S5 dip switch through 5) .. 7g) Bin Control .. 84. Bin Control Troubleshooting.

4 8a) Machine Will Not Start .. 8b) Machine Will Not Shut Off .. 85. Float Switch Troubleshooting .. 86. Control Board Check Procedure .. 97. Control Board Replacement .. 0 III. Technical Information .. A. Water Circuit and Refrigeration Circuit .. KM- 55 BAH (air-cooled) .. KM- 55 BWH (water-cooled) .. 4B. Wiring Diagram .. 3 . KM- 55 BAH (air-cooled) .. 3 . KM- 55 BWH (water-cooled) .. 4C. Performance Data .. 5 . KM- 55 BAH (air-cooled) .. 5 . KM- 55 BWH (water-cooled) .. 6IV. Service Diagnosis .. 7A. 0-Minute Diagnostic Procedure .. 7B. Diagnostic Charts .. 8 . No Ice Production .. 8 . Evaporator is Frozen Up ..3 3. Low Ice Production ..334. Abnormal Ice ..335. Other.

5 33V. Removal and Replacement of Components ..35A. Servicing the Refrigeration Circuit ..35 . Refrigerant Recovery ..35 . Evacuation and Recharge (R-404A) ..35B. Brazing ..36C. Removal and Replacement of Compressor ..36D. Removal and Replacement of Drier ..37E. Removal and Replacement of Expansion Valve ..38F. Removal and Replacement of Hot Gas Valve ..39G. Removal and Replacement of Evaporator ..40H. Removal and Replacement of Air-Cooled Condenser ..40I. Removal and Replacement of Water-Cooled Condenser ..4 J. Removal and Replacement of Water Regulating Valve - Water-Cooled Model Only ..4 K. Adjustment of Water Regulating Valve - Water-Cooled Model Only ..4 L. Removal and Replacement of Thermistor.

6 43M. Removal and Replacement of Fan Motor ..44N. Removal and Replacement of Freeze or Harvest Water Valve ..44O. Removal and Replacement of Wash Valve ..45P. Removal and Replacement of Pump Motor ..45Q. Removal and Replacement of Spray Tube ..46VI. Cleaning and Maintenance Instructions ..47A. Cleaning ..47 . Cleaning Procedure ..47 . Sanitizing Procedure - Following Cleaning Procedure ..49B. Maintenance ..49C. Preparing the Icemaker for Long Storage ..505AC SUPPLY VOLTAGE115/60/1 AMPERAGE9 A ( 5 Min. Freeze AT 104 F / WT 80 F)MINIMUM CIRCUIT AMPACITYN/AMAXIMUM FUSE SIZEN/AAPPROXIMATE ICE PRODUCTIONA mbientWATER TEMP. ( F)PER 24 ( F)507090 ( kg/day ) 70 * 235 (107) 227 (103) 207 (94) Reference without *marks 80 229 (104) 216 (98) 191 (87) 90 227 (103) * 207 (94) 184 (83)100211 (96) 202 (91) 163 (74)SHAPE OF ICEC rescent CubeICE PRODUCTION PER CYCLE4 lbs.

7 ( kg ) 204 STORAGE CAPACITY120 & WATER CONSUMPTION90/70 F70/50 F ELECTRIC W (kWH/100 lbs.)828 ( )744 ( ) WATER ( lbs.) 51 ( ) 82 ( )EXTERIOR DIMENSIONS (WxDxH)30" x 28" x 39" (762 x 711 x 990 mm)Includes 6" legEXTERIOR FINISHS tainless steel; Galvanized steel (rear)WEIGHTNet 203 lbs. ( 92 kg ), Shipping 220 lbs. ( 100 kg )CONNECTIONS - ELECTRICCord Connection - WATER SUPPLYI nlet 1/2" FPT - DRAINO utlet 3/4" FPTCUBE CONTROL SYSTEMN/A (Internal programming)HARVESTING CONTROL SYSTEMHot Gas and Water, Thermistor and TimerICE MAKING WATER CONTROLT imer Controlled. Overflow PipeCOOLING WATER CONTROLN/ABIN CONTROL SYSTEMM echanical Level Switch and TimerCOMPRESSORH ermetic, Model SC12 MLXCONDENSERAir cooled, Fin and Tube typeEVAPORATORV ertical type, Stainless Steel and CopperREFRIGERANT CONTROLT hermostatic Expansion ValveREFRIGERANT CHARGER-404A,1 lb.

8 1 oz. (475 g)DESIGN PRESSUREHigh 467 PSIG, Low 240 BOARD CIRCUIT PROTECTIONHigh Voltage Cut-out ( Internal )COMPRESSOR PROTECTIONAuto-reset Overload Protector ( Internal )REFRIGERANT CIRCUIT PROTECTIONAuto-reset High Pressure Control SwitchLOW WATER PROTECTIONF loat SwitchACCESSORIES -SUPPLIEDIce Scoop; 6" Leg, 4 pcs. -REQUIREDN/AOPERATING CONDITIONSVOLTAGE RANGE104 - 127 VAMBIENT TEMP. 45 - 100 FWATER SUPPLY TEMP. 45 - 90 FWATER SUPPLY PRESSURE 10 - 113 PSIGI. SpecificationsA. Icemaker1. KM-255 BAH (air-cooled)Note: We reserve the right to make changes in specifications and design without prior KM-255 BWH (water-cooled)Note: We reserve the right to make changes in specifications and design without prior Left Blank7II.

9 General InformationA. Construction1. KM-255 BAH (air-cooled)Hot Gas ValveStrainerFan MotorRear View of Compressor & CondenserControl BoxSpray TubeEvaporatorFuseCondenserElectrical BoxControl SwitchCompressorFreeze Water ValveHarvest Water ValveExpansion ValveDrierWash ValveRear View of IcemakerWater TankBin Control Switch(back side of tank)Float SwitchPump MotorBin Control DetectorWater Tank, Bin Control & Pump Motor82. KM-255 BWH (water-cooled)Control BoxSpray TubeEvaporatorFuseCondenserElectrical BoxControl SwitchCompressorFreeze Water ValveHarvest Water ValveExpansion ValveDrierWash ValveRear View of IcemakerWater TankBin Control Switch(back side of tank)Float SwitchPump MotorBin Control DetectorWater Tank, Bin Control & Pump MotorHot Gas ValveStrainerWater RegulatorRear View of Compressor & Condenser9B.

10 Sequence of OperationThe steps in the sequence are as outlined below. When power is supplied, the red LED on the control board comes on. A 5 second delay occurs at startup. Note that the order of the green LEDs from the outer edge of the board is , 4, 3, .1. One Minute Fill CycleLED 4 is on. FWV opens and the fill period begins. After minute, the board checks for a closed LF/S. If LF/S is closed, the harvest cycle begins. If not, FWV will remain energized through additional minute cycles until water enters the sump and LF/S closes. This serves as a low water safety to protect the water Initial Harvest Cycle LEDs , 4 and are on. FWV closes, HGV opens, water valve relay energizes and HWV opens, Comp energizes, and harvest begins.