Hoshizaki Ice Maker Control Board: Thermistor Testing and Troubleshooting for Models KM-1301SRH and KM-1301SWH
Page 19

1. Control Board Layout

"G" Control Board

• Bin Control Switch

• "ALARM RESET" Button

• S4 Dip Switch

• "OUTPUT TEST" Button

(used to test relays on control board)

Closed LED (green)

 

 

 

(on continuously

 

 

• WHITE K3 Connector

in thermostatic bin

 

 

 

 

Harvest Control

control application)

 

 

 

 

(thermistor)

 

 

 

• Bin Control Switch

 

 

• RED K4 Connector

Open LED (yellow)

 

 

 

 

K4 Jumper (4A4883G01)

(mechanical bin control

 

 

 

 

for Thermostatic Bin

application only)

 

 

 

 

Control Application

 

 

 

• Part Number

 

 

(KM-1301SAH-E) or

 

 

Mechanical Bin Control

 

 

 

• Alarm Buzzer

 

 

(KM-1301SWH-E,

 

 

KM‑1301SRH-E)

 

 

 

• Power LED (red)

 

 

• S5 Dip Switch

(lights when power

 

 

• BLACK K5 Connector

is supplied to the

 

 

control board)

 

 

Float Switch

• Relay LEDs

 

 

• Label

 

 

(control board revision

(4) (indicate

 

 

level indicated on label

which relays are

 

 

on side of relay)

energized as listed

 

 

 

below)

 

 

• K1 Ten-Pin Connector

• LED 2 (X2 Relay)

 

 

Pins #1 through #10

 

 

#1, 9 Magnetic Contactor

Hot Gas Valve (HGV)

 

 

#2 Hot Gas Valve (HGV)

Fan Motor (FM)

 

 

#3 Liquid Line Valve (LLV),

(FM off when LED on)

 

 

Fan Motor (FM)

• LED 3 (X3 Relay)

 

 

#4 Pump Motor (icemaking)

 

 

#5 Pump Motor (pump-out,

Pump Motor (PM)

 

 

 

 

harvest (if applicable))

(on at pump-out,

 

 

 

 

#6 Inlet Water Valve (WV)

harvest (if applicable))

 

 

 

 

#7, 10 Component Power

 

 

 

• LED 4 (X4 Relay)

 

 

Supply

 

 

#8 Open

Inlet Water Valve (WV)

 

 

 

• LED 1 (X1 Relay)

 

 

 

Compressor (Comp),

 

 

 

Fan Motor-Remote

 

 

 

(FMR)

 

 

 

•K2 Connector

Transformer

"G" Control Board

Part Number 2A3792-01

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Contents Superior Degree Reliability Hoshizaki AMERICA, INC Contents Page Unit Important Safety InformationSerious injury Indicates important information about the use and careKM-1301SAH-E air-cooled Specifications IcemakerKM-1301SWH-E water-cooled KM-1301SRH-E remote air-cooled URC-14FE Condenser UnitSpecifications II. General Information Construction KM-1301SWH-E water-cooled Separators Initial Harvest Cycle Sequence of OperationSequence Cycles and Shutdown Minute Fill CycleHarvest Cycle S4 Dip Switch Setting Pump-Out 1st Pump-Out FrequencyFreeze Cycle Pump-Out CycleCycle at Shutdown Mechanical Bin Control Activation Mechanical Bin Control KM-1301SWH-E, KM-1301SRH-EMechanical BC Bin Full Shutdown and Restart Sequence Flow ChartCycle Steps Minute Fill Harvest Cycle Pump-Out CycleControl Board Control Board Control Board LayoutTime LEDs are On LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Every 3 sec Sequence StepDefault Dip Switch Settings Controls and AdjustmentsHarvest Timer S4 dip switch 1 Pump-Out Frequency Control S4 dip switch 5 Pump-Out Timer S4 dip switch 3Time seconds Inlet S4 Dip Switch Setting Pump Motor Time seconds Harvest Pump Timer S4 dip switchFactory Use S4 dip switch Freeze Timer S4 dip switch 9Float Switch Control S5 dip switch Control SwitchRefill Counter S5 dip switch 2 through Tank Water Tank Headmaster Service Drier Valve Thermistor U-0 Auxiliary Code Wiring DiagramsAuxiliary Code T-0, U-0 KM-1301SAH-E air-cooledAuxiliary Code U-1 and Later PressureSwitch KM-1301SRH-E remote air-cooled Performance Data 1335 13301240 17802070 12701142 1950Diagnostic Procedure IV. Service DiagnosisPage S4 Dip Switch Setting Pump-Out 1st Pump-Out Frequency Mechanical Bin Control KM-1301SWH-E, KM-1301SRH-E Shutdown Thermostatic Bin Control KM-1301SAH-EControl Board Check Thermostatic Bin Control Check KM-1301SAH-E Bin Control CheckMechanical Bin Control Check Stacked Unit Connection Detail Single Unit Connection DetailMechanical Bin Control Cleaning Float Switch Check Float Switch Check and CleaningFloat Switch Cleaning Thermistor Check Adjustment of Water Regulating Valve water-cooled modelNo Ice Production Diagnostic ChartsNo Ice Production Possible Cause No Ice Production Possible Cause Freeze Up Possible Cause Harvest Cycle Freeze UpFreeze Up Possible Cause Freeze Cycle Low Ice Production Possible Cause Long Harvest Cycle Low Ice ProductionLong Freeze Cycle Service for Refrigerant Lines Replacement of ComponentsRefrigerant Recovery Evacuation and Recharge R-404A BrazingPage Component Important Notes for Component ReplacementCleaning Procedure VI. Cleaning and MaintenanceIce Chute Float Switch Assembly Drain Plug Sanitizing Procedure Following Cleaning Procedure Remove the water from the icemaker water supply line MaintenanceDrain the water tank
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