Hoshizaki KM-250BWF Bedienungsanleitung

1HOSHIZAKICRESCENT CUBERMODELSERVICE MANUALKM-250BAFKM-250BWFNO.:ISSUED:REVISED: July 24, 2000 73094 December 22, 2004

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

11The green LED’s 1-4 represent the corresponding relays and energize and sequence 5seconds from initial start-up as follows:Sequence Step LED’s on L

12(Control Products HOS-001A Board)to the K1 connector. If there is a white wire, place the switch in the C position. If thisswitch is placed in the w

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

142nd 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

15[d] Controls and AdjustmentsThe dip switch is factory-adjusted to the following positions:Switch Nos. 1 and 2:Used for adjustment of the defrost tim

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

173) 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

185) Freeze TimerCAUTIONAdjust to proper specification, or the unit may not operate correctly.Two new dip switches numbered 9 and 10 have been added t

19After the 1 minute ± 5 second water supply cycle and the 2 minute ± 10 second defrostcycle, the unit should start the freeze cycle. (ii) After the a

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

20III. Technical Information1. Water Circuit and Refrigerant Circuit[a] KM-250BAF

21[b] KM-250BWF

222. Wiring DiagramKM-250BAF, KM-250BWFNote: Pressure Switch - HIKM-250BAF KM-250BWFCut-out 467 PSIG 427 PSIGCut-in 284.5 ±21.

233. Timing Chart*1 The pump motor for KM-250B series does not have drain cycle.*2 The icemaker does not complete a defrost cycle in the first 2 or 3

24*1 The pump motor for KM-250B series does not have drain cycle.*2 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes. See “I

254. Performance Data[a] KM-250BAF

26[b] KM-250BWF

27 PROBLEM POSSIBLE CAUSE REMEDY[1] The icemaker a) Power Supply 1. “OFF” position. 1. Move to “ON” position will not start 2. Loose co

28 PROBLEM POSSIBLE CAUSE REMEDYl) Controller Board 1. Defective 1. See “II.2[e] Checking the Controller Board.”[2] Water a) Float Switc

29 PROBLEM POSSIBLE CAUSE REMEDY[5] No water a) Water Supply Line 1. Water pressure too low and 1. Check and get comes from water l

3CONTENTSI. Specifications ... 51. KM

30 PROBLEM POSSIBLE CAUSE REMEDY[1] Freeze cycle a) Float Switch 1. Leads short-circuit or 1. Check and replace. time is too defect

31 PROBLEM POSSIBLE CAUSE REMEDY[1] Small Cube a) Ice Cube Guide 1. Out of position. 1. Place in position. Circulated water fa

32V. Removal and Replacement of ComponentsIMPORTANTEnsure all components, fasteners and thumbscrews are securely in placeafter the equipment is servic

332. BrazingDANGER1. Refrigerant R-404A itself is not flammable, explosive or poisonous.However, when exposed to high temperatures (open flames), R-4

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

3515) Evacuate the system, and charge it with refrigerant. See the nameplate for therequired refrigerant charge.16) Connect the terminals, and replace

365. Removal and Replacement of Expansion ValveIMPORTANTSometimes moisture in the refrigerant circuit exceeds the drier capacityand freezes up at the

376. Removal and Replacement of Hot Gas ValveCAUTIONAlways use a copper tube of the same diameter and length when replacingthe hot gas lines; otherwis

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

398. Removal and Replacement of Water Regulating Valve - Water-CooledModel OnlyIMPORTANTAlways install a new drier every time the sealed refrigeration

411. Removal and Replacement of Fan Motor - Except Water-Cooled Model ... 4212. Removal and Replacement of Water Valve ...

409. Adjustment of Water Regulating Valve - Water-Cooled Model OnlyThe water regulating valve, also called “water regulator”, is factory-adjusted. Noa

41Fig. 2Foam Insulation Thermistor HolderThermistor Lead Cable Tie10. Removal and Replacement of ThermistorCAUTION1. Fragile, handle very carefully.2.

4211. Removal and Replacement of Fan Motor - Except Water-CooledModelNote: When replacing a fan motor with defective winding, it is recommended that

4313. Removal and Replacement of Pump MotorNote: When replacing a pump motor with defective winding, it is recommended that anew capacitor be installe

4414. Removal and Replacement of Float Switch1) Go through the steps 1) through 9) in “13. Removal and Replacement of PumpMotor.”2) Remove the connect

45VI. Cleaning and MaintenanceIMPORTANTEnsure all components, fasteners and thumbscrews are securely in placeafter any maintenance or cleaning is done

46[2] 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 cont

472. Cleaning and Sanitizing InstructionsIMPORTANTEnsure all components, fasteners and thumbscrews are securely in placeafter any maintenance or clean

484) Remove the plug at the bottom of the watertank to drain the tank. See Fig. 4. Afterdraining, replace the plug in its correctposition.5) Pull out

49[c] Sanitizing SolutionDilute 1 fl. oz. (30 ml or 2 tbs) of 5.25% sodium hypochlorite solution (chlorine bleach)with 2 gallons (7.6 l) of warm water

5I. Specifications1. KM-250BAF

5014) Move the control switch to the “ICE” position to fill the water tank with water.15) After 3 minutes, move the control switch to the “OFF” positi

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

62. KM-250BWF

7II. General Information1. Construction[a] KM-250BAF

8[b] KM-250BWF

92. Controller Board[a] Solid-State Control1) A HOSHIZAKI exclusive solid-state control is employed in KM-250BAF andKM-250BWF Crescent Cubers.2) A pri