Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 service manual Control Board Layout

Page 27

1. Control Board Layout

a) "E" Control Board: Auxiliary Code T-0, U-0

 

"E" Control Board

 

 

"OUTPUT TEST" Button

"ALARM RESET" Button

S4 Dip Switch

(used to test relays on control board)

 

Freeze Timer LED

 

 

 

 

WHITE K3 Connector

 

 

Harvest Control

 

 

(thermistor)

Harvest Timer LED

 

RED K4 Connector

 

 

 

 

Mechanical Bin Control

 

 

(not used on units with

 

 

themostatic bin control)

Alarm Buzzer

 

Microprocessor

 

 

 

 

(control board revision

Power LED

 

level indicated by last

(lights when

 

2 digits on label)

power is

 

BLACK K5 Connector

supplied to the

 

 

Float Switch

control board)

 

 

 

Relay LEDs (4)

 

Part Number

(indicate which

 

K1 Ten-Pin Connector

relays are energized

 

as listed below)

 

Pins #1 through #10

LED 2 (X2 Relay)

 

 

#1, 9 Magnetic Contactor

Hot Gas Valve (HGV)

 

#2 Hot Gas Valve (HGV)

Fan Motor (FM) (FM off

 

#3 Fan Motor (FM),

when LED on)

 

Liquid Line Valve (LLV)

Liquid Line Valve (LLV)

 

#4 Pump Motor (icemaking)

LED 3 (X3 Relay)

 

#5 Pump Motor (pump-out)

 

#6 Inlet Water Valve (WV)

Pump Motor (PM)

 

 

#7, 10 Component Power

(on at pump-out only)

 

 

Supply

LED 4 (X4 Relay)

 

 

#8 Open

Inlet Water Valve (WV)

 

 

LED 1 (X1 Relay)

 

Switch for "C" control board

Compressor (Comp),

 

and "ALPINE" control board

Fan Motor-Remote

 

(service control board only)

(FMR)

 

 

 

K2 Connector

 

 

Transformer

 

"E" Control Board

Part Number 2A1410-01 (factory); 2A1410-02 (service)

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Contents KM-901MAH KM-901MWH Hoshizaki AMERICA, INC Contents Page Page Unit Important Safety InformationSerious injury Indicates important information about the use and care1a. KM-901MAH air-cooled Auxiliary Code T-0, U-0 Specifications Icemaker1b. KM-901MAH air-cooled Auxiliary Code U-1 and Later Water Cooled Condenser 2a. KM-901MWH water-cooled Auxiliary Code T-0, U-02b. KM-901MWH water-cooled Auxiliary Code U-1 and Later 3a. KM-901MRH remote air-cooled Auxiliary Code T-0, U-0 3b. KM-901MRH remote air-cooled Auxiliary Code U-1 and Later 4a. KM-901MRH3 remote air-cooled Auxiliary Code T-0, U-0 4b. KM-901MRH remote air-cooled Auxiliary Code U-1 and Later Condenser Unit Model URC-9F SpecificationsKM-901MAH air-cooled II. General Information ConstructionKM-901MWH water-cooled KM-901MRH/3 remote air-cooled Sequence of Operation Sequence Cycles and ShutdownControl Board Auxiliary Code T-0, U-0 Control Board Auxiliary Code U-1 and Later ShutdownOFF Cycle at Shutdown Mechanical Bin Control Activation Bin Full Control Board Sequence Flow ChartSequence Flow Chart CycleFill Cycle Control Board Auxiliary Code U-1Later Minute Harvest Cycle Freeze Cycle Pump-Out CycleControl Board Control Board Control Board LayoutPart Number 2A3792-01 Maximum Water Supply Period 6 minutes Harvest Backup Timer and Freeze TimerHigh Temperature Safety Low Water SafetyEnergized Time LEDs are On Components Min Max Avg LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Every 3 sec Sequence StepControl Board Auxiliary Code U-1 and Later S4 Dip Switch S4 Dip Switch No Controls and AdjustmentsDefault Dip Switch Settings Harvest Timer S4 dip switch 1Pump-Out Timer S4 dip switch 3 Pump-Out Frequency Control S4 dip switch 5S4 Dip Switch Setting Time seconds Inlet Control Board S4 Dip Switch Setting Pump Motor Time seconds Bin Control Selector/Harvest Pump Timer S4 dip switchFactory Use S4 dip switch Control Board S4 Dip Switch Setting Bin ControlS4 Dip Switch Setting Time Minutes Freeze Timer S4 dip switch 9Float Switch Control S5 dip switch 1 G Control Board Refill Counter S5 dip switch 2 through 5 G Control BoardThermistor Float SwitchControl Switch Bin ControlWater Pump Switch Discharge Line Wiring Diagrams ModelCooled-AirWater-Cooled Model PressureHigh* SwitchKM-901MAH air-cooled and KM-901MWH water-cooled PressureSwitch KM-901MRH remote air-cooledHigh KM-901MRH3 remote air-cooled Cooled-AirModel High* Pressure Switch Cooled-WaterModelHigh Pressure Switch SwitchPressure Performance Data 1570 912835 1480KM-901MRH remote air-cooled KM-901MRH3 remote air-cooled Diagnostic Procedure IV. Service DiagnosisPage OFF Shutdown Thermostatic Bin Control Auxiliary Code T-0, U-0 Control Board CheckControl Correct LED Board Lighting Sequence Bin Control CheckMechanical Bin Control Check Mechanical Bin Control Cleaning Float Switch Check Float Switch Check and CleaningFloat Switch Cleaning Thermistor Check Diagnostic Charts Problem Possible Cause RemedyNo Ice Production Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Problem Possible Cause Remedy Low Ice Production Abnormal Ice Other Removal and Replacement of Components Service for Refrigerant LinesRefrigerant Recovery Evacuation and Recharge R-404A BrazingRemoval and Replacement of Compressor Removal and Replacement of Expansion Valve Page Removal and Replacement of Evaporator Removal and Replacement of Air-Cooled Condenser Removal and Replacement of Water-Cooled Condenser Removal and Replacement of Remote Air-Cooled Condenser Page Adjustment of Water Regulating Valve water-cooled model Removal and Replacement of Thermistor Removal and Replacement of Inlet Water Valve Removal and Replacement of Pump Motor Removal and Replacement of Control Board Cleaning and Sanitizing Instructions VI. Cleaning and MaintenanceCleaning Procedure Sanitizing Procedure Following Cleaning Procedure Preparing the Icemaker for Long Storage MaintenanceDrain the water tank
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