Hoshizaki KM-901MWH User Manual

1Hoshizaki “A Superior Degree of Reliability” www.hoshizaki.com Models KM-901MAH KM-901MWH KM-901MRH/3 Modular Crescent Cuber Hoshizaki America, Inc

102b. KM-901MWH (water-cooled) Auxiliary Code U-1 and LaterAC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)AMPERAGE 8.7A ( 5 Min. Freeze

113a. KM-901MRH (remote air-cooled) Auxiliary Code T-0, U-0Note: We reserve the right to make changes in specications and design without prior notice

123b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and LaterAC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)AMPERAGE 11.6A ( 5 Min.

134a. KM-901MRH3 (remote air-cooled) Auxiliary Code T-0, U-0Note: We reserve the right to make changes in specications and design without prior notic

144b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and LaterAC SUPPLY VOLTAGE 208-230/60/3AMPERAGE 7.0A ( 5 Min. Freeze AT 104°F / WT 80°F)MINIMU

15B. Condenser Unit1. URC-9FUnit: mm [in.]

16 SpecicationsMODEL: URC-9FNote: We reserve the right to make changes in specications and design without prior notice.AC SUPPLY VOLTAGE 115/60/1 (C

17II. General InformationA. Construction1. KM-901MAH (air-cooled)Thermostatic Bin ControlAuxiliary Code T-0, U-0Water Supply InletCondenserDrierContro

182. KM-901MWH (water-cooled)Water Supply InletCondenserDrierControl BoxSpray TubesControl SwitchWater PumpFloat SwitchCompressorExpansion ValvesWater

193. KM-901MRH/3 (remote air-cooled)Receiver TankWater Supply InletJunction BoxesDrierControl BoxSpray TubesControl SwitchWater PumpFloat SwitchCompre

2IMPORTANTOnly qualied service technicians should install, service, and maintain the icemaker. No service or maintenance should be undertaken until t

20B. Sequence of Operation1. Sequence Cycles and Shutdowna) "E" Control Board: Auxiliary Code T-0, U-0 The steps in the sequence are as outl

21(5) Harvest CycleSame as the initial harvest cycle. See "II.B.1.a)(2) Initial Harvest Cycle."Note: Unit continues to cycle until TBC is sa

22(3) Freeze CycleLED 1 is on. Comp and FMR remain energized, PM, FM, and LLV energize. HGV and WV de-energize. For the rst 5 minutes, CB will not ac

23(6) ShutdownWhen MBC is activated (MBC open), the yellow "BC OPEN" LED comes on. The unit then shuts down as outlined in the table below.C

242. Sequence Flow Charta) "E" Control Board: Auxiliary Code T-0, U-04. Pump-Out Cycle•Factorysetforevery10th cycle (S4 dip switch 5 &a

25b) "G" Control Board: Auxiliary Code U-1 and Later•WVtime:6min.orthelengthofharvestminus0or50 sec. (S4 dip switch 7), whiche

26C. Control Board•AHoshizakiexclusivesolid-statecontrolboardisemployedinKM-901MAH,KM-901MWH, and KM-901MRH/3 Modular Crescent Cubers.•All

271. Control Board Layouta) "E" Control Board: Auxiliary Code T-0, U-0"E" Control BoardPart Number 2A1410-01 (factory); 2A1410-02

28"G" Control BoardPart Number 2A3792-01 "G" Control Board"ALARM RESET" Button"OUTPUT TEST" Button(used to tes

292. Featuresa) Maximum Water Supply Period - 6 minutes"E" control board: The inlet water valve is open during harvest for 6 minutes or the

3IMPORTANTThis manual should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualied service technici

30f) LED Lights and Audible Alarm Safeties(1) "E" Control Board: Auxiliary Code T-0, U-0At startup, a 5-second delay occurs while the contro

31(2) "G" Control Board: Auxiliary Code U-1 and LaterAt startup, a 5-second delay occurs while the control board conducts an internal timer

323. Controls and AdjustmentsCAUTIONDip switches are factory set. Failure to maintain factory settings may adversely affect performance and warranty c

33c) Pump-Out Timer (S4 dip switch 3 & 4)When a pump-out is called for, the pump motor de-energizes after the preceding freeze cycle. The pump mot

34e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7)Depending on the control board, S4 dip switch 7 is either a bin control selector or harv

35g) Freeze Timer (S4 dip switch 9 & 10)CAUTIONAdjust to proper specication, or the unit may not operate correctly.The freeze timer setting deter

36D. Bin Control1. Thermostatic Bin Control: Auxiliary Code T-0, U-0CAUTIONWhen the ambient temperature is below 45°F (7°C), the thermostatic bin cont

37III. Technical InformationA. Water Circuit and Refrigeration Circuit1. KM-901MAH (air-cooled)Water SupplyCleaning ValveFloat SwitchDrainCheck ValveE

382. KM-901MWH (water-cooled)Water SupplyCleaning ValveFloat SwitchDrainCheck ValveExpansion ValvesCompressorHot Gas ValveCheck ValvesHigh Pressure Sw

393. KM-901MRH/3 (remote air-cooled)Water SupplyCleaning ValveFloat SwitchDrainCheck ValveExpansion ValvesCompressorHot Gas ValveCheck ValvesHigh Pres

43. Controls and Adjustments ... 32a) Default Dip Switch Settings .

40B. Wiring Diagrams1. Thermostatic Bin Control: Auxiliary Code T-0, U-0a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled)*Transformer Output 10.5

41b) KM-901MRH (remote air-cooled)* High Pressure SwitchCut-out 412±21 PSIGCut-in 327±21 PSIG0*Transformer Output 10.5V at 115VThermostatic Bin Contr

42c) KM-901MRH3 (remote air-cooled)* High Pressure SwitchCut-out 412±21 PSIGCut-in 327±21 PSIG0*Transformer Output 10.5V at 115VThermostatic Bin Cont

432. Mechanical Bin Control: Auxiliary Code U-1 and Latera) KM-901MAH (air-cooled) and KM-901MWH (water-cooled)Mechanical Bin Control: Auxiliary Code

44b) KM-901MRH (remote air-cooled)* High Pressure SwitchCut-out 412±21 PSIGCut-in 327±21 PSIG0*Transformer Output 10.5V at 115VMechanical Bin Control

45c) KM-901MRH3 (remote air-cooled)Mechanical Bin Control: Auxiliary Code U-1 and Later*Transformer Output 10.5V at 115V* High Pressure SwitchCut-out

46C. Performance Data1. KM-901MAH (air-cooled)Note:1. Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used fo

47Note:1. Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for reference only.2. We reserve the right to

483. KM-901MRH (remote air-cooled)Note:1. Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for reference

49Note:1. Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold should be used for reference only.2. We reserve the right to

5V. Removal and Replacement of Components ... 68A. Service for Refrigerant Lines ...

50IV. Service Diagnosis WARNING1. This unit should be diagnosed and repaired only by qualied service personnel to reduce the risk of death, electric

513) 1-Minute Fill Cycle – LED 4 is on. WV energizes. After 1 minute, CB checks for a closed F/S. If F/S is closed, the harvest cycle begins. If close

525) Freeze Cycle – LED 1 is on. Comp and FMR remain energized, PM, LLV, and FM energize. WV and HGV de-energize. The unit is held in freeze by a 5-mi

537) Normal Harvest Cycle – same as the initial harvest cycle – See "IV.A.4) Initial Harvest Cycle." 8) Shutdowna) Thermostatic Bin Control:

543) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control switch is in the "ICE" position, then press th

552. Mechanical Bin Control Check and Cleaning: Auxiliary Code U-1 and Latera) Mechanical Bin Control CheckTo check the mechanical bin control switch,

56b) Mechanical Bin Control CleaningScale may build up on the mechanical bin control. Scale can cause the actuator paddle and magnet to stick. In this

57D. Float Switch Check and Cleaning1. Float Switch CheckTo check the oat switch, follow the steps below.1) Turn off the power supply.2) Remove the f

582. Float Switch CleaningDepending on local water conditions, scale may build up on the oat switch. Scale on the switch can cause the oat to stick.

59E. Thermistor CheckTo check thermistor resistance, follow the steps below.1) Turn off the power supply.2) Remove the front panel, then move the cont

6Important Safety InformationThroughout this manual, notices appear to bring your attention to situations which could result in death, serious injury,

60F. Diagnostic Charts1. No Ice ProductionProblem Possible Cause Remedy[1] The icemaker will not start.a) Power Supply 1. Off, blown fuse, or tripped

61Problem Possible Cause Remedy[1] The icemaker will not start. (continued)h) Transformer 1. Coil winding open or shorted.1. Replace.i) Wiring to Cont

62Problem Possible Cause Remedy[3] Compressor will not start or stops operating.a) Magnetic Contactor 1. Bad contacts. 1. Check for continuity and rep

63Problem Possible Cause Remedy[7] Fan motor will not start, or is not operating (except water-cooled model).a) Fan Motor 1. Motor winding open. 1. Re

64Problem Possible Cause Remedy[1]Freeze cycle time is too long. (continued)f) Thermistor 1. Disconnected, loose, or defective.1. Connect, secure, che

65Problem Possible Cause Remedy[2]All ice formed on evaporator does not fall into bin in harvest cycle. (continued)l) Refrigerant 1. Low charge. 1. Ch

66Problem Possible Cause Remedy[1] Freeze cycle time is long. (continued)n) Control Board 1. Float switch connection loose (K5).1. Check and reconnect

67Problem Possible Cause Remedy[2] Cloudy or irregular cubes.a) Evaporator 1. Frozen up. 1. See chart 2. 2. Scaled up. 2. Clean3. Damaged. 3. Replace

68V. Removal and Replacement of Components WARNING1. This unit should be diagnosed and repaired only by qualied service personnel to reduce the risk

692. Brazing WARNING1. R-404A itself is not ammable at atmospheric pressure and temperatures up to 176°F (80°C).2. R-404A itself is not explosive or

7I. SpecicationsA. Icemaker1a. KM-901MAH (air-cooled) Auxiliary Code T-0, U-0Note: We reserve the right to make changes in specications and design w

704) Close the low-side valve and high-side valve on the gauge manifold.5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a

718) Attach the rubber grommets of the prior compressor to the new compressor.9) Place the compressor in position and secure it using the bolts and wa

728) 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 detecto

7310) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant char

74F. Removal and Replacement of Air-Cooled CondenserCAUTION1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do n

75G. Removal and Replacement of Water-Cooled CondenserCAUTION1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do

76H. Removal and Replacement of Remote Air-Cooled CondenserCAUTION1. Always install a new drier every time the sealed refrigeration system is opened.

77I. Removal and Replacement of Water Regulating Valve (water-cooled model)CAUTION1. Always install a new drier every time the sealed refrigeration sy

78Fig. 4Adjustment ScrewCW – HigherCCW – LowerTop View18) Check for water leaks.19) Replace the panels in their correct positions.20) Turn on the powe

798) Braze all ttings with nitrogen gas owing at a pressure of 3 to 4 PSIG.9) Use an electronic leak detector or soap bubbles to check for leaks. Ad

81b. KM-901MAH (air-cooled) Auxiliary Code U-1 and LaterAC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)AMPERAGE 11.4 A ( 5 Min. Freeze

8010) Secure the insulation using plastic cable ties.11) Connect the white thermistor connector through the bushing of the control box to the control

8112) Replace the front panel in its correct position.13) Turn on the power supply.O. Removal and Replacement of Pump Motor1) Turn off the power suppl

82P. Removal and Replacement of Control BoardWhen replacing a control board follow the precautions below. CAUTION1. The control board is fragile; hand

83VI. Cleaning and Maintenance WARNINGCHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after any cleaning or ma

841. Cleaning Procedure1) Dilute 16 . oz. (473 ml) of Hoshizaki "Scale Away" with 3 gal. (11 l) of warm water. 2) Remove all ice from the e

8519) Turn off the power supply after 3 minutes.20) Remove the front panel and fully open the cleaning valve.21) Move the control switch to the "

86B. Maintenance This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. WARNING1. O

875) Attach a compressed air or carbon dioxide supply to the icemaker water supply line drain valve.6) Move the control switch to the "ICE"

92a. KM-901MWH (water-cooled) Auxiliary Code T-0, U-0Note: We reserve the right to make changes in specications and design without prior notice.AC SU