Hoshizaki HOSHIZAKI KMD-900MAH User Manual

™SERVICE MANUALKMD-700MAHKMD-700MWHKMD-700MRHKMD-900MAHKMD-900MWHKMD-900MRHMODULAR CRESCENT CUBERReliability is abeautiful thingTMITEM #: 73107REVISED

106. KMD-900MRHAC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)AMPERAGE 14 A ( 5 Min. Freeze AT 104°F / WT 80°F)MINIMUM CIRCUIT AMPACITY

117. Condensing UnitURC-12F

12 SpecificationsMODEL: URC-12FEXTERIORDIMENSIONS (W x D x H)REFRIGERANT CHARGEURC-12FWEIGHTCONNECTIONSREFRIGERANTELECTRICALCONDENSERHEAD PRESSURE CON

13II. General Information1. Construction[a] KMD-700MAHCONTROL BOXSPRAY TUBEFLOAT SWITCHWATER PUMPCOMPRESSORBIN CONTROLDRIERCONDENSERFAN MOTORCONDENSER

14[b] KMD-700MWHWATERREGULATORCONDENSERCONTROL BOXSPRAY TUBEFLOAT SWITCHWATER PUMPCOMPRESSORBIN CONTROLDRIERJUNCTION BOXHOT GAS VALVEWATER SUPPLY INLE

15[c] KMD-700MRHCONTROL BOXSPRAY TUBEFLOAT SWITCHWATER PUMPCOMPRESSORBIN CONTROLDRIERRECEIVER TANKJUNCTION BOXHOT GAS VALVEWATER SUPPLY INLETEXPANSION

16[d] KMD-900MAHCONTROL BOXSPRAY TUBEFLOAT SWITCHWATER PUMPCOMPRESSORBIN CONTROLDRIERCONDENSERFAN MOTORCONDENSERJUNCTION BOXHOT GAS VALVEWATER SUPPLY

17[e] KMD-900MWHWATERREGULATORCONDENSERCONTROL BOXSPRAY TUBEFLOAT SWITCHWATER PUMPCOMPRESSORBIN CONTROLDRIERJUNCTION BOXHOT GAS VALVEWATER SUPPLYINLET

18[f] KMD-900MRHCONTROL BOXSPRAY TUBEFLOAT SWITCHWATER PUMPCOMPRESSORBIN CONTROLDRIERRECEIVERTANKJUNCTION BOXHOT GAS VALVEWATER SUPPLYINLETEXPANSION V

192. Controller Board[a] Solid-State Control1) A HOSHIZAKI exclusive solid-state control is employed in KMD Modular CrescentCubers.2) A printed circui

2Only qualified service technicians should attempt to service or maintain thisicemaker. No service or maintenance should be undertaken until the techn

202) Defrost TimerThe defrost cycle starts when the float switch opens and completes the freeze cycle. Butthe defrost timer does not start counting un

21The green LEDs 1-4 represent the corresponding relays and energize and sequence5 seconds from initial startup as follows:{LED 1 – Comp; LED 2 - H

22(Control Products HOS-001A Board)The application switch located between relay X3 & X4 must be set to match the originalboard application. Place

23[c] Sequence1st Cycle1. Unit energized and control switch to “ICE” position. Water supply cycle starts.2. After 1 minute, defrost cycle starts

242nd Cycle and after with pump drainIMPORTANTFreeze cycle time is limited to 60 minutes evenif float switch does not open.1. Float switch opens and s

252nd Cycle and after with no pump drainIMPORTANTFreeze cycle time is limited to 60 minutes evenif float switch does not open.1. Float switch opens an

26Switch Nos. 9 and 10:Used for adjustment of freeze timer.The freeze timer determines maximumfreeze cycle time. Upon termination offreeze timer, mach

271) Defrost ControlA thermistor (semiconductor) is used for a defrost control sensor. The resistance variesdepending on the suction line temperatures

283) Drain TimerThe drain timer is factory-adjusted, and no adjustment is required.SETTING TIMEDip Switch Dip SwitchNo. 3 No. 4 T1 T2OFF OFF 10 second

296) Bin Control5) Freeze TimerCAUTIONAdjust to proper specification, or the unit may not operate correctly.Two new dip switches numbered 9 and 10 hav

3Please review this manual. It should be read carefully before the icemaker is serviced ormaintenance operations are performed. Only qualified service

30(iv) After step (iii), de-energize the unit and confirm that the defrost timer is in theminimum position. Disconnect the resistor from the controlle

313. Mechanical Bin Control[a] Proximity Switch1) This machine uses a lever-actuated proximity switch (hereafter called “mechanical bincontrol”) to c

32[c] Troubleshooting1) Machine will not start(i) Move dip switch no. 7 to the “OFF” position. If the machine starts up within a few seconds, t

33III. Technical Information1. Water Circuit and Refrigerant Circuit[a] KMD-700MAH and KMD-900MAH* Note: KMD-900M_H models have two expansion valves.

34[b] KMD-700MWH and KMD-900MWH* Note: KMD-900M_H models have two expansion valves.

35[c] KMD-700MRH and KMD-900MRH* Note: KMD-900M_H models have two expansion valves.

362. Wiring Diagrams[a1] KMD-700MAH and KMD-700MWH (auxiliary code R-0 and earlier)Note: Pressure SwitchMAHCut-out 412 ± PSIGCut-in 327 ± 21 PSIG2102

37[a2] KMD-700MAH and KMD-700MWH (auxiliary code R-1 and later)Note: Pressure SwitchMAHCut-out 412 ± PSIGCut-in 327 ± 21 PSIG210210MWHCut-out 384 ±

38[b1] KMD-700MRH (auxiliary code R-0 and earlier)Note: Pressure SwitchCut-out 412 ± PSIGCut-in 327 ± 21 PSIG210

39[b2] KMD-700MRH (auxiliary code R-1 and later)Note: Pressure SwitchCut-out 412 ± PSIGCut-in 327 ± 21 PSIG210

43. Timing Chart ... 444. Performance Data

40[c1] KMD-900MAH and KMD-900MWH (auxiliary code R-0 and earlier)Note: Pressure SwitchMAHCut-out 412 ± PSIGCut-in 327 ± 21 PSIG210210MWHCut-out 384 ±

41[c2] KMD-900MAH and KMD-900MWH (auxiliary code R-1 and later)Note: Pressure SwitchMAHCut-out 412 ± PSIGCut-in 327 ± 21 PSIG210210MWHCut-out 384 ±

42Note: Pressure SwitchCut-out 412 ± PSIGCut-in 327 ± 21 PSIG210[d1] KMD-900MRH (auxiliary code R-0 and earlier)

43[d2] KMD-900MRH (auxiliary code R-1 and later)Note: Pressure SwitchCut-out 412 ± PSIGCut-in 327 ± 21 PSIG210

443. Timing ChartNote:*1 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes. See“II. 2. [d] Controls and Adjustments.”*2 The b

45Note:*1 The pump motor waits for 2 seconds before starting a drain cycle. See “II. 2. [d]Controls and Adjustments.”*2 The icemaker does not complete

464. Performance Data[a] KMD-700MAHNote: Pressure data is recorded at 5 minutes into freeze cycle. The data not in boldshould be used for reference on

47[b] KMD-700MWH70/21701318 675 306 634 28880/27 681 309 640 290 597 27190/32 675 306611277569 258lbs./day kg./day100/38 665 302 601 273 530 24070/2

48[c] KMD-700MRH70/21730331 715 324 655 29780/27 719 326 696 316 614 27890/32 715 324679308605 275lbs./day kg./day100/38 690 313 662 300 538 24470/2

49[d] KMD-900MAH70/21875397 842 382 767 34880/27 850 386 799 362 706 32090/32 842 382763346676 307lbs./day kg./day100/38 817 370 743 337 596 27070/2

5I. Specifications1. KMD-700MAHWe reserve the right to make changes in specifications and design without prior notice.AC SUPPLY VOLTAGE 208-230/60/1 (

50[e] KMD-900MWH70/21886402 859 390 816 37080/27 865 392 823 373 777 35290/32 859 390793360747 339lbs./day kg./day100/38 848 385 782 355 705 32070/2

51[f] KMD-900MRH70/21906411 878 398 814 36980/27 885 401 842 382 763 34690/32 878 398812368737 335lbs./day kg./day100/38 857 389 795 360 669 30370/2

52IV. Service Diagnosis1. No Ice ProductionProblem Possible Cause Remedy[1] a) Power Supply 1. OFF position. 1. Move to ON position.2. Loose connectio

53Problem Possible Cause Remedy[1] Continued from previous page.l) Controller Board 1. Defective. 1. See "II.2[e] Checking the Controller Board.&

54Problem Possible Cause Remedy[3] Continued from previous page.h) Controller Board 1. Defective. 1. See "II.2[e] Checking the Controller Board.&

552. Evaporator is Frozen UpProblem Possible Cause Remedy[1] a) Float Switch 1. Leads short-circuit or defective switch.1. Check and replace.2. Float

564. Abnormal Ice5. Other3. Low Ice ProductionProblem Possible Cause Remedy[1] a)b)[2] Harvest cycle time is long.a)See chart 1.[3] and check high pre

57V. Removal and Replacement of ComponentsIMPORTANT1. The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly.Therefore it is imp

585) Disconnect the vacuum pump, and attach a refrigerant service cylinder to the high-sideline. Remember to loosen the connection, and purge the air

593. Removal and Replacement of CompressorIMPORTANTAlways install a new drier every time the sealed refrigeration system is opened.Do not replace the

62. KMD-700MWHWe reserve the right to make changes in specifications and design without prior notice.AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutr

6015) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooledmodels, see the nameplate for the required refrigerant charg

614. Removal and Replacement of DrierIMPORTANTAlways install a new drier every time the sealed refrigeration system isopened. Do not replace the drier

623) Recover the refrigerant and store it in an approved container.4) Remove the insulation and the expansion valve bulb on the suction line.5) Remove

63IMPORTANTAlways install a new drier every time the sealed refrigeration system isopened. Do not replace the drier until after all other repair or re

647. Removal and Replacement of EvaporatorIMPORTANTAlways install a new drier every time the sealed refrigeration system isopened. Do not replace the

658. Removal and Replacement of Water Regulating Valve (Water-CooledModel Only)IMPORTANTAlways install a new drier every time the sealed refrigeration

669. Adjustment of Water Regulating Valve (Water-Cooled Model Only)The water regulating valve (also called “water regulator”) is factory-adjusted. No

6710. Removal and Replacement of Condensing Pressure Regulator(C.P.R.) (Remote Air-Cooled Model Only)IMPORTANTAlways install a new drier every time th

6811. Removal and Replacement of ThermistorCAUTION1. Fragile, handle very carefully.2. Always use a recommended sealant (high thermal conductive type)

69 Min. 4-3/4"Liquid Bypass Flow10) Secure the insulation using the plastic cable ties.11) Connect the thermistor leads through the bush

7We reserve the right to make changes in specifications and design without prior notice.3. KMD-700MRHAC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutr

7013. Removal and Replacement of Water Valve1) Turn off the power supply.2) Close the water supply line shut-off valve.3) Remove the front panel.4) Re

718) Remove the closed end connectors from the pump motor leads.9) Remove the two screws and the pump motor bracket.10) Remove the pump housing, and c

7216. Removal and Replacement of Bin Control1) Turn off the power supply.2) Remove the front panel and top panel.3) Remove the two thumbscrews securin

73VI. Cleaning and Maintenance Instructions1. Preparing the Icemaker for Long StorageIMPORTANTWhen shutting off the icemaker for an extended time, dra

74[2] Remove the water from the potable water supply line:1) Remove the front panel. (Except water-cooled models)2) Move the control switch on the con

75Fig. 5Top ViewDrain PlugWater ShieldOverflow CapOverflow PipeCube Guide (A)Cube Guide (B)

762. Cleaning InstructionsWARNING1. HOSHIZAKI recommends cleaning this unit at least once a year. Morefrequent cleaning, however, may be required in s

77Note: To remove cubes on the evaporator, turn off the power supply and turn it backon after 3 minutes. The defrost cycle starts and the cubes will b

7819) Turn on the power supply to fill the water tank with water.20) Turn off the power supply after 3 minutes.21) Remove the front panel, and fully o

79[b] Sanitizing Procedure - Following Cleaning Procedure1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with water (Add approxi-mate

84. KMD-900MAH We reserve the right to make changes in specifications and design without prior notice.AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neut

803. MaintenanceIMPORTANTThis icemaker must be maintained individually, referring to the instructionmanual and labels provided with the icemaker.1) St

95. KMD-900MWHWe reserve the right to make changes in specifications and design without prior notice.AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutr