Hoshizaki KM-1301SWH-E Sequence of Operation, Sequence Cycles and Shutdown, Minute Fill Cycle

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B. Sequence of Operation

IMPORTANT

KM-1301SAH-E utilizes a thermostatic bin control. For KM-1301SAH-E operation, the K4 jumper (4A4883G01) must be in place on the control board RED K4 connector or the unit will not operate.

1. Sequence Cycles and Shutdown

The steps in the sequence are as outlined below. When power is supplied, CB red "POWER OK" LED and green "BC CLOSED" LED come on. If red "POWER OK" LED is off on KM-1301SAH-E, clear ice away from the thermostatic bin control bulb in the storage bin area. If yellow "BC OPEN" LED is on, the unit will not start. In this case check that CB has the K4 jumper in place on CB RED K4 connector (KM-1301SAH-E) or clear ice away from the mechanical bin control actuator paddle in the storage bin area (KM‑1301SWH-E, KM-1301SRH-E). There is a 5-second delay before startup. Note that the order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.

a)1-Minute Fill Cycle

LED 4 is on. WV and X2 relay (auxiliary code T-0, U-0), X11 relay (auxiliary code

U-1 and later) energize and the 1-minute fill cycle begins. After 1 minute, CB checks for a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV remains energized through additional 1-minute fill cycles until water fills the tank and closes F/S. This serves as a low water safety to protect PM.

b)Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV and X2 relay (auxiliary code T-0, U-0), X11 relay (auxiliary code U-1 and later) remain energized, HGV, X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary code U-1 and later), Comp, and FMR energize. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches

48°F (9°C), CB reads a 3.9 kΩ signal from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90,

120, and 180 seconds. For details, see "II.C.2.b) Harvest Timer (S4 dip switch 1 & 2)."

WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter.

CAUTION! Do not adjust S4 dip switch 7 out of the factory default position on this model. Adjustment outside of the factory default position may result in damage to the icemaker. For details, see "II.C.2.e) Harvest Pump Timer (S4 dip switch 7)." LED 4 goes off when WV and X2 relay (auxiliary code T-0, U-0), X11 relay (auxiliary code

U-1 and later) de-energize. LED 3 comes on and PM energizes and runs for the last 0 or 50 seconds of harvest depending on S4 dip switch 7 setting. This circulates water over the evaporator for the last 0 or 50 seconds of harvest. PM is energized through the #5 pin (DBu wire) on the CB K1 ten-pin connector and the X1 relay (auxiliary code T‑0, U-0),

X10 relay (auxiliary code U‑1 and later). When the harvest timer terminates, the harvest cycle is complete. CB checks the position of F/S and proceeds to the freeze cycle if it is closed or calls for a 1‑minute fill cycle if it is open. The minimum total time allowed by CB for a complete harvest cycle is 2 minutes.

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Contents Superior Degree Reliability Hoshizaki AMERICA, INC Contents Page Indicates important information about the use and care Important Safety InformationSerious injury UnitSpecifications Icemaker KM-1301SAH-E air-cooledKM-1301SWH-E water-cooled KM-1301SRH-E remote air-cooled Condenser Unit URC-14FESpecifications II. General Information Construction KM-1301SWH-E water-cooled Separators Minute Fill Cycle Sequence of OperationSequence Cycles and Shutdown Initial Harvest CyclePump-Out Cycle S4 Dip Switch Setting Pump-Out 1st Pump-Out FrequencyFreeze Cycle Harvest CycleMechanical Bin Control KM-1301SWH-E, KM-1301SRH-E Cycle at Shutdown Mechanical Bin Control ActivationPump-Out Cycle Sequence Flow ChartCycle Steps Minute Fill Harvest Cycle Mechanical BC Bin Full Shutdown and RestartControl Board Control Board Layout Control BoardSequence Step LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Every 3 sec Time LEDs are OnHarvest Timer S4 dip switch 1 Controls and AdjustmentsDefault Dip Switch Settings Time seconds Inlet Pump-Out Timer S4 dip switch 3Pump-Out Frequency Control S4 dip switch 5 Freeze Timer S4 dip switch 9 Harvest Pump Timer S4 dip switchFactory Use S4 dip switch S4 Dip Switch Setting Pump Motor Time secondsRefill Counter S5 dip switch 2 through Control SwitchFloat Switch Control S5 dip switch Tank Water Tank Headmaster Service Drier Valve Thermistor KM-1301SAH-E air-cooled Wiring DiagramsAuxiliary Code T-0, U-0 U-0 Auxiliary CodeAuxiliary Code U-1 and Later PressureSwitch KM-1301SRH-E remote air-cooled Performance Data 1780 13301240 13351950 12701142 2070IV. Service Diagnosis Diagnostic ProcedurePage S4 Dip Switch Setting Pump-Out 1st Pump-Out Frequency Shutdown Thermostatic Bin Control KM-1301SAH-E Mechanical Bin Control KM-1301SWH-E, KM-1301SRH-EControl Board Check Mechanical Bin Control Check Bin Control CheckThermostatic Bin Control Check KM-1301SAH-E Single Unit Connection Detail Stacked Unit Connection DetailMechanical Bin Control Cleaning Float Switch Check and Cleaning Float Switch CheckFloat Switch Cleaning Adjustment of Water Regulating Valve water-cooled model Thermistor CheckNo Ice Production Possible Cause Diagnostic ChartsNo Ice Production No Ice Production Possible Cause Freeze Up Freeze Up Possible Cause Harvest CycleFreeze Up Possible Cause Freeze Cycle Long Freeze Cycle Low Ice ProductionLow Ice Production Possible Cause Long Harvest Cycle Refrigerant Recovery Replacement of ComponentsService for Refrigerant Lines Brazing Evacuation and Recharge R-404APage Important Notes for Component Replacement ComponentVI. Cleaning and Maintenance Cleaning ProcedureIce Chute Float Switch Assembly Drain Plug Sanitizing Procedure Following Cleaning Procedure Maintenance Remove the water from the icemaker water supply lineDrain the water tank
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