Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 Control Board Sequence Flow Chart, Cycle, Bin Full

Page 24

"E" Control Board Sequence Flow Chart

KM-901MAH, KM-901MWH, KM-901MRH/3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cycle Steps

 

 

 

 

1. 1-Minute Fill

2. Harvest Cycle

 

 

 

 

 

3. Freeze Cycle

 

 

 

4. Pump-Out Cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Factory set for every

 

 

 

 

Cycle

 

 

 

• WV time: 6 min. or the length of harvest,

 

• Minimum freeze time: 5 min.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10th cycle (S4 dip

 

 

 

 

 

 

 

 

 

 

 

 

 

 

whichever is shorter.

 

 

 

 

 

 

• Maximum freeze time: freeze timer setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Maximum harvest time: 20 min.

 

(S4 dip switch 9 & 10

 

 

 

switch 5 & 6)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Pump motor stops

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for 2 sec., then

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermistor in control

 

 

1 to 3-min. timer in control

 

 

 

 

5-min. timer

 

 

 

 

 

F/S in control

 

reverses for 10/20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

sec. (S4 dip switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Initial startup

 

 

 

 

 

 

 

 

 

 

 

 

(S4 dip switch 1 & 2)

 

 

in control

 

 

 

 

3 & 4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

begins here

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F/S Check

 

 

 

F/S closed

 

 

 

 

 

F/S Check

 

F/S closed

 

 

 

 

 

 

F/S open or freeze

after 5 sec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

delay

 

WV energized

 

 

WV continues

Thermistor temperature

 

Comp continues

 

timer expires

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Comp continues

 

 

 

 

 

 

 

 

 

 

 

 

Comp energized

reaches 48°F (9°C)

 

FMR continues

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FMR continues

 

 

 

 

 

 

 

 

 

F/S open

 

 

HGV energized

(3.9 kΩ or less) Harvest

 

PM energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HGV energized

 

 

 

 

 

 

 

 

 

 

 

 

FMR energized

timer starts

 

FM energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PM de-energizes for 2 sec.,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LLV energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

then reverses for 10/20 sec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HGV de-energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F/S open

 

 

 

 

FM de-energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WV de-energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LLV de-energized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If F/S is open, compressor stops and cycle returns to 1-Minute Fill Cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a) "E" Control Board: Auxiliary

2. Sequence Flow Chart

Code T-0, U-

 

24

Shutdown

 

 

 

1. Bin Full

 

 

 

 

 

 

Unit shuts down

 

 

 

and Restart

 

within 10 sec.

 

 

 

 

 

 

 

 

 

 

 

 

after ice contacts

 

 

 

 

 

 

thermostatic bulb.

TBC Operation

 

 

 

 

 

 

 

 

 

 

2. Icemaker Off

 

3. Ice Level Lowered

 

All components

 

Ice level lowered. No ice

de-energized.

 

touching thermostatic

 

 

bulb. Icemaker starts at

 

 

"1. 1-Minute Fill Cycle."

 

 

To 1 above

 

 

0

Ice contacts

TBC open

TBC closed

thermostatic bulb

All components

 

 

de-energized

 

Legend:

Comp–compressor FM–fan motor FMR–fan motor-remote F/S–float switch HGV–hot gas valve LLV–liquid line valve

TBC–thermostatic bin control PM–pump motor WV–inlet water valve

Components Energized when the Control Switch is in the "WASH" Position

The "WASH" position on the control switch is used when cleaning and sanitizing the unit. When in the "WASH" position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer flow over the outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer flow over both the outside and the inside of the evaporator plate assembly.

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the unit will not restart when the control switch is placed in the "ICE" position.

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Contents KM-901MAH KM-901MWH Hoshizaki AMERICA, INC Contents Page Page Important Safety Information Serious injuryIndicates important information about the use and care UnitSpecifications Icemaker 1a. KM-901MAH air-cooled Auxiliary Code T-0, U-01b. KM-901MAH air-cooled Auxiliary Code U-1 and Later 2a. KM-901MWH water-cooled Auxiliary Code T-0, U-0 Water Cooled Condenser2b. 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 Specifications Model URC-9FII. General Information Construction KM-901MAH air-cooledKM-901MWH water-cooled KM-901MRH/3 remote air-cooled Sequence of Operation Sequence Cycles and ShutdownControl Board Auxiliary Code T-0, U-0 Shutdown Control Board Auxiliary Code U-1 and LaterOFF Cycle at Shutdown Mechanical Bin Control Activation Control Board Sequence Flow Chart Sequence Flow ChartCycle Bin FullControl Board Auxiliary Code U-1 LaterMinute Harvest Cycle Freeze Cycle Pump-Out Cycle Fill CycleControl Board Control Board Layout Control BoardPart Number 2A3792-01 Harvest Backup Timer and Freeze Timer High Temperature SafetyLow Water Safety Maximum Water Supply Period 6 minutesLED Lights and Audible Alarm Safeties No. of Beeps Type of Alarm Every 3 secSequence Step Energized Time LEDs are On Components Min Max AvgControl Board Auxiliary Code U-1 and Later Controls and Adjustments Default Dip Switch SettingsHarvest Timer S4 dip switch 1 S4 Dip Switch S4 Dip Switch NoPump-Out Timer S4 dip switch 3 Pump-Out Frequency Control S4 dip switch 5S4 Dip Switch Setting Time seconds Inlet Bin Control Selector/Harvest Pump Timer S4 dip switch Factory Use S4 dip switchControl Board S4 Dip Switch Setting Bin Control Control Board S4 Dip Switch Setting Pump Motor Time secondsFreeze Timer S4 dip switch 9 Float Switch Control S5 dip switch 1 G Control BoardRefill Counter S5 dip switch 2 through 5 G Control Board S4 Dip Switch Setting Time MinutesFloat Switch Control SwitchBin Control ThermistorWater 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 Switch Cooled-WaterModel Cooled-AirModel High* PressureHigh Pressure Switch SwitchPressure Performance Data 912 8351480 1570KM-901MRH remote air-cooled KM-901MRH3 remote air-cooled IV. Service Diagnosis Diagnostic ProcedurePage OFF Control Board Check Shutdown Thermostatic Bin Control Auxiliary Code T-0, U-0Bin Control Check Control Correct LED Board Lighting SequenceMechanical Bin Control Check Mechanical Bin Control Cleaning Float Switch Check and Cleaning Float Switch CheckFloat 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 Brazing Evacuation and Recharge R-404ARemoval 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 VI. Cleaning and Maintenance Cleaning and Sanitizing InstructionsCleaning Procedure Sanitizing Procedure Following Cleaning Procedure Maintenance Preparing the Icemaker for Long StorageDrain the water tank
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