Hoshizaki KM-501MWH Manuel d'utilisateur

1Hoshizaki“A Superior Degreeof Reliability”www.hoshizaki.comModelsKM-501MAHKM-501MWHKM-501MRHModular Crescent CuberHoshizaki America, Inc.SERVICE MANU

10II. General InformationA. Construction1. KM-501MAH (air-cooled) Spray Tubes Water Supply Inlet

112. KM-501MWH (water-cooled) Spray Tubes Water Supply Inlet Con

123. KM-501MRH (remote air-cooled) Spray Tubes Water Supply Inlet

13B. Sequence of OperationThe steps in the sequence are as outlined below. When power is supplied, a 5 second delay occurs at startup. Note that the o

14KM-501MAH, KM-501MWH, KM-501MRH Sequence Flow Chart and Component Operation1. One Minute Fill Cycle2. Harvest Cycle 3. Freeze Cycle4. Pump-Out Cycle

15C. Control Board• A HOSHIZAKI exclusive solid-state control is employed in KM-501MAH, KM-501MWH and KM-501MRH Modular Crescent Cubers.• All models a

16Control BoardPart Number 2A1410-01 (factory); 2A1410-02 (service)Type HOS-001A (Control Products - 10 Pin)Control Products "E" Control Boa

172. Featuresa) Maximum Water Supply Period – 6 minutesInlet water valve opening, in the harvest cycle, is limited by the harvest timer. The water val

18f) LED Lights and Audible Alarm SafetiesThe red LED indicates proper control voltage and will remain on unless a control voltage problem occurs. At

193. Controls and Adjustmentsa) Default Dip Switch SettingsThe dip switch is factory-adjusted to the following positions:Dip Switch No. 1 2 3 4 5 6 7

2IMPORTANTOnly qualified service technicians should attempt to service or maintain this icemaker. No such service or maintenance should be undertaken u

20c) Harvest Timer (dip switch 1 & 2)The harvest timer starts counting when the thermistor reads 48°F (9°C) at the evaporator outlet.No adjustment

21e) Pump-Out Frequency Control (dip switch 5 & 6)The pump motor drains the water tank at the frequency set by the pump-out frequency control.The

224. Control Board Check ProcedureBefore replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the

23III. Technical InformationA. Water Circuit and Refrigeration Circuit1. KM-501MAH (air-cooled)

242. KM-501MWH (water-cooled)

253. KM-501MRH (remote air-cooled)

26B. Wiring Diagrams1. KM-501MAH (air-cooled) and KM-501MWH (water-cooled)* Pressure SwitchAir-Cooled Model Water-Cooled ModelCut-out 412±21 PSIG 384

272. KM-501MRH (remote air-cooled)** Pressure SwitchCut-out 412±21 PSIGCut-in 327±21 PSIG0

28C. Timing Chart*1 The icemaker does not complete a harvest cycle in the first 2 or 3 minutes. See "II.C.3. Controls and Adjustments."

29*1 The pump motor waits for 2 seconds before starting a pump-out drain cycle. See "II.C.3. Controls and Adjustments."*2 The icemaker does

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

3070/21 498 226 474 215 433 19780/27 480 218 442 201 397 18090/32 474 215 416 189 372 169lbs./day kg./day100/38 463 210 406 184 332 15070/2180/2790/

312. KM-501MWH (water-cooled)Note:1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used for reference onl

323. KM-501MRH (remote air-cooled)Note:1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used for referenc

33IV. Service DiagnosisA. 10-Minute KM Diagnostic Procedure The 10 minute check out procedure is basically a sequence check which can be used at unit

34freeze with the float switch removed, replace the board. Note: Normal freeze cycle will last 20 to 40 minutes depending on model and conditions. Cycl

35Problem Possible Cause Remedy3. Ambient or condenser water temperature too warm.3. Reduce temperature.4. Refrigerant overcharged.4. Recharge.5. Fan

36Problem Possible Cause Remedym)Interlock Switch Open (Cleaning Valve)1. Misaligned. 1. Realign.2. Bad contacts. 2. Check for continuity and replace.

37Problem Possible Cause Remedy2.Clogged. 2. Clean.3. Pump out check valve leaking by.3. Check assembly and clean.d)Pump Motor 1. Motor winding opened

382. Evaporator is Frozen UpProblem Possible Cause Remedy[1]Freeze cycle time is too long.a)Float Switch 1. Leads short-circuit or defective switch.1.

39Problem Possible Cause Remedyg)Water Supply Line 1. Too small; requires 3/8" OD line dedicated per machine.1. Increase water line size.h)Water

4III. Technical Information ... 23A. Water Circuit

40Problem Possible Cause Remedy2. Mounting pad out of position.2. Reinstall.d) Refrigerant Lines 1. Rub or touch other lines or surfaces.1. Replace.[3

41V. Removal and Replacement of ComponentsIMPORTANTEnsure all components, fasteners and thumbscrews are securely in place after the equipment is servi

428) If necessary, add any remaining charge to the system through the low-side. Use a throttling valve or liquid dispensing device to add the remainin

434) Remove the terminal cover on the compressor, and disconnect the compressor wiring.5) Remove the discharge and suction pipes using brazing equipme

44E. Removal and Replacement of Expansion ValveIMPORTANTSometimes moisture in the refrigeration circuit exceeds the drier capacity and freezes up at t

451) Turn off the power supply.2) Remove the panels.3) Recover the refrigerant and store it in an approved container.4) Remove the screw and the solen

4610) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant char

472) 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

4810) Replace the panels in their correct positions.11) Turn on the power supply.K. Removal and Replacement of ThermistorIMPORTANT1. Fragile, handle v

49L. Removal and Replacement of Fan MotorNote: When replacing a fan motor with defective winding, it is recommended that a new capacitor be installed.

5AC SUPPLY VOLTAGE 115/60/1AMPERAGE 13 A ( 5 Min. Freeze AT 104°F / WT 80°F)MINIMUM CIRCUIT AMPACITY 20 AMAXIMUM FUSE SIZE 20 AAPPROXIMATE ICE PRODUC

507) Remove the closed end connectors from the pump motor leads.8) Remove the screw attaching the pump motor assembly to the base, then remove the pum

51VI. Cleaning and Maintenance InstructionsIMPORTANTEnsure all components, fasteners and thumbscrews are securely in place after any maintenance or cl

521. Cleaning Procedure1) Dilute approximately 16 fl. oz. of the recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Econom

5320) Remove the front panel, and fully open the cleaning valve.21) Move the control switch to the "WASH" position.22) Replace the front pan

542. Storage Bin and Scoop• Wash your hands before removing ice. Use the plastic scoop provided (Accessory).• The storage bin is for ice use only. Do

552. Remove the water from the potable water supply line:1) Remove the front panel (except water-cooled model).2) Move the control switch on the contr

62. KM-501MWH (water-cooled)Note: We reserve the right to make changes in specifications and design without prior notice.AC SUPPLY VOLTAGE 115/60/1AMPE

73. KM-501MRH (remote air-cooled)Note: We reserve the right to make changes in specifications and design without prior notice.AC SUPPLY VOLTAGE 115/60/

8B. Condensing Unit1. URC-6F24"(610 mm.)23-1/32"(585 mm.)19-11/16"(500 mm.)18-1/8"(460 mm.)20-15/32"(520 mm.)21-15/16"(5

9 SPECIFICATIONSMODEL: URC-6FGalvanized Steel21-15/16" x 15-11/16" x 17-7/8"(557 x 398 x 453.8 mm.)R404A 1 lb. 2 oz. (505 g)Net 61 lbs