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Hoshizaki HR24A service manual Control Board Layout, Display Module Layout

Models: HR24A

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1. Control Board Layout

1. Control Board Layout

Control Board

Ribbon Cable

Control Board

Display Module

Power Supply Input (115VAC)

Compressor (115VAC)

	Cabinet Thermistor
E1
CONTROL BOARD
	Door Switch (5VDC)
RIBBON CABLE	Evaporator Fan Motor
	Evaporator Fan Motor
	(12VDC)

E2

DISPLAY MODULE

Fig. 1

Display Module

2. Display Module Layout

Cabinet Temperature LEDs	"-" Down	"+" Up	"P" Set	Power
Display	Button	Button	Button	Button
Display
	°F

Alarm Icon

	Compressor Icon		°F LED
	Defrost Icon	Evaporator Fan Motor Icon

Fig. 2

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Image 14

Hoshizaki HR24A service manual Control Board Layout, Display Module Layout

Contents

“A Superior Degree of Reliability” Number IssuedUndercounter Refrigerator Model HR24A HoshizakiHoshizaki America, IncPeachtree City, GA Complete and detailed explanation of the problemHOSHIZAKI AMERICA, INC 618 Highway 74 South Attn Hoshizaki Technical Support DepartmentCONTENTS B. Maintenance VI. Cleaning and Maintenance InstructionsA. Cleaning 1. ExteriorImportant Safety Information WARNING, continued A. Electrical and Refrigerant Data I. SpecificationsB. Storage Capacity and Dimensions 1. Storage Capacity2. Dimensions Unit mm inII. General Information A. Construction 1. HR24A1. Startup B. Sequence of OperationaRefrigerator 2. Cool Down6. Defrost Termination 4. Cool Down Restart5. Defrost Initiation 7. Energy Saving Mode1. Startup HR24A Sequence Flow Chart2. Sequence Flow Chart 2. Cool DownC. Control Board and Display Module 1. Control Board Layout 2. Display Module Layoutb Manual Defrost D. Cabinet TemperatureaAdjusting the Temperature Setpoint 1. Default SettingsE. Display Module Icons F. Control Panel LockoutG. Alarm Safeties a High and Low Temperature Alarm Values AH or AL1Enter Service Menu H.Service Menua Service Menu Access 2Service Menu Listb Service Menu Chart Factory Setting Defrost Do Not AdjustService Menu UnitFactory Setting Temperature Alarm Do Not AdjustService Menu UnitEvaporator Fan Motor Do Not Adjust Factory Setting Serial Network Do Not AdjustService Menu UnitEvaporator Capillary Tube Evaporator Fan Motor III. Technical Data A. Refrigeration CircuitLeft Side Perimeter Liquid Line Condenser Drier CompressorB. Wiring Diagram 1. HR24AIV. Service Diagnosis A.Diagnostic Procedure2-min.Comp delay timer starts. Comp icon flashes until 2-min.Comp delay timer terminates. Diagnosis Check that CT LEDs and EvapFM icon turn on. Next, check that EvapFM energizes. If not, confirm that DS is engaged. Check across DS for 5VDC. If 5VDC is not present, check DS activation lever and DS continuity. Note DS contacts are open when DS is engaged. If 5VDC is present, check CB EvapFM connector for 12VDC. If 12VDC is not present, replace CB. If 12VDC is present, check EvapFM wiring connector for loose connection, EvapFM continuity, and fan blade for binding 12Energy Saving Mode 10Defrost B. Control Board CheckStartup and Cool Down C. Thermistor Check D. Diagnostic Chart 1.Appliance Not CoolingEvaporator is Frozen Up - Possible Cause 2. Evaporator is Frozen Up3. Defrost Fails to Start or Terminate 1.Refrigerant Recovery V. Replacement of ComponentsA.Service for Refrigerant Lines 2. Brazing 3.Evacuation and Recharge R-134aB.Important Notes for Component Replacement C. Door Reversal VI. Cleaning and Maintenance Instructions A. CleaningB. Maintenance When shutting down the appliance for more than one week, follow the instructions below VIII. Disposal