Manuals / Hoshizaki / Kitchen Appliance / Ice Maker

Hoshizaki KM-1301SAH/3, KM-1301SRH/3, KM-1301SWH/3 service manual C. Control Board

Models: KM-1301SWH/3 KM-1301SRH/3 KM-1301SAH/3

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C. Control Board

C. Control Board

•A Hoshizaki exclusive solid-state control board is employed in KM-1301SAH/3, KM‑1301SWH/3, and KM-1301SRH/3, Stackable Crescent Cubers.

•All models are pretested and factory set.

CAUTION

1.The control board is fragile; handle very carefully.

2.The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit before handling or replacing the control board.

3.Do not touch the electronic devices on the control board or the back of the control board.

4.Do not change wiring and connections. Do not misconnect K3, K4, and K5, because the same connector is used for the thermistor, K4 jumper, and float switch. The control board RED K4 connector must have the K4 jumper in place for proper operation.

5.Always replace the whole control board assembly if it goes bad.

6.Do not short out power supply to test for voltage.

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Hoshizaki KM-1301SAH/3, KM-1301SRH/3, KM-1301SWH/3 service manual C. Control Board

Contents

KM-1301SWH/3 KM-1301SRH/3 SERVICE MANUAL Stackable Crescent Cuber Models KM-1301SAH/3HoshizakiHoshizaki America, Inc HOSHIZAKI AMERICA, INC 618 Highway 74 South •Complete and detailed explanation of the problemPeachtree City, GA Attn: Hoshizaki Technical Support DepartmentCONTENTS f Factory Use S4 dip switch e Harvest Pump Timer S4 dip switchg Freeze Timer S4 dip switch 9 & h Float Switch Control S5 dip switchA. Service for Refrigerant Lines V. Removal and Replacement of Components1. Refrigerant Recovery B. Removal and Replacement of CompressorImportant Safety Information 1. KM-1301SAH air-cooled I. Specifications A. Icemaker2. KM-1301SAH3 air-cooled 3. KM-1301SWH water-cooled 4. KM-1301SWH3 water-cooled 5. KM-1301SRHremote air-cooled 6. KM-1301SRH3remote air-cooled B. Condenser Unit 1. URC-14FUnit: inches mm MODEL URC-14F SPECIFICATIONS1. KM-1301SAH, KM-1301SAH3 air-cooled II. General Information A.Construction2. KM-1301SWH, KM-1301SWH3 water-cooled 3. KM-1301SRH, KM-1301SRH3remote air-cooled 1. Sequence Cycles and Shutdown B. Sequence of Operationa1-MinuteFill Cycle bInitial Harvest CycledPump-OutCycle eHarvest CyclefShutdown Timer G Control Board Sequence Flow ChartKM-1301SAH/3, KM-1301SWH/3,and KM-1301SRH/3 Harvest PumpC. Control Board 1. Control Board Layout G Control BoardControl Board Part Number 2A3792-01cHigh Temperature Safety bHarvest Backup Timer and Freeze TimerdLow Water Safety aMaximum Water Supply Period - 6 minutesf LED Lights and Audible Alarm Safeties 3. Controls and Adjustments aDefault Dip Switch SettingsbHarvest Timer S4 dip switch dPump-OutFrequency Control S4 dip switch 5 & c Pump-OutTimer S4 dip switch 3 &e Harvest Pump Timer S4 dip switch f Factory Use S4 dip switchg Freeze Timer S4 dip switch 9 & i Refill Counter S5 dip switch 2 through h Float Switch Control S5 dip switchG. Control Switch E. Float SwitchD. Bin Control F. ThermistorIII. Technical Information A. Water Circuit and Refrigeration CircuitTank Water Tank KM-1301SWH, KM-1301SWH3 water-cooledWater Tank Spray Tubes1.Auxiliary Code T-0, U-0 B. Wiring Diagramsa KM-1301SAH air-cooled Transformer Output 10.5V atAuxiliary Code T-0, U-0bKM 1301SWH water-cooledTransformer Output 10.5V at Cut-out Auxiliary Code T-0, U-0cKM412±21 PSIGKM-1301SAH3 air-cooledand KM water1301SWH3 cooledKM-1301SRH3remote air-cooled Auxiliary Code T-0, U-0Transformer Output 10.5V atAuxiliary Code U-1and LaterTransformer Output 10.5V atU-1and Later Auxiliary Codeb KM-1301SWH water-cooled 10.5V atc KM-1301SRHremote air-cooled Auxiliary Code U-1and Later10.5V at Transformer OutputWater-CooledModel Air-CooledModelCut-out 412±21 PSIGe KM 1301SRH3 remote air-cooledTransformer Output 10.5V atC. Performance Data APPROXIMATE ICE APPROXIMATE ICE APPROXIMATE ICE APPROXIMATE ICE APPROXIMATE ICE A.Diagnostic Procedure IV. Service Diagnosis31-MinuteFill Cycle – LED 4 is on. WV and X2 relay auxiliary code T-0,U‑0 5Freeze Cycle – LED 1 is on. Comp and FMR remain energized, PM energizes or remains energized depending on harvest pump timer S4 dip switch 7 setting. FM and LLV energize. HGV, and X1 relay auxiliary code T‑0, U-0,X10 relay auxiliary code U‑1 and later de‑energize. The unit is held in freeze by a 5-minuteshort cycle protection timer CB will not accept a signal from F/S. After the 5-minuteshort cycle protection timer expires, CB turns freeze termination over to F/S. During the first 5 minutes of freeze, confirm that the evaporator temperature drops. After 8Shutdown B. Control Board Check D.Float Switch Check and Cleaning 1. Float Switch CheckC. Bin Control Check Fig. 2.Float Switch CleaningE.Thermistor Check 1. No Ice Production F. Diagnostic Charts1 The icemaker will not 3 Compressor will 2. Evaporator is Frozen Up 1Freeze cycle time is 3. Low Ice Production 4. Abnormal Ice 5. Other V. Removal and Replacement of Components A.Service for Refrigerant Lines1.Refrigerant Recovery 3.Evacuation and Recharge R-404A 2. BrazingB.Removal and Replacement of Compressor C.Removal and Replacement of Expansion Valve 11Place the expansion valve cover in position E. Removal and Replacement of Evaporator F. Removal and Replacement of Air-CooledCondenser 1Turn off the power supply 2Remove the panels 1Turn off the power supply water‑cooled model Regulator - C.P.R. remote air-cooledmodel Fig. L.Removal and Replacement of Thermistorremote air‑cooled models N.Removal and Replacement of Inlet Water ValveFig. O. Removal and Replacement of Pump MotorP. Removal and Replacement of Control Board A. Cleaning and Sanitizing Instructions VI. Cleaning and Maintenance1.Cleaning Procedure 18Replace the front panel in its correct position C. Preparing the Icemaker for Long Storage B. Maintenance Instructions1. Stainless Steel Exterior 2.Storage Bin and Scoop3.Drain the water tank Fig.