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Hoshizaki 73168 service manual 2b. HPR72A-D Auxiliary Code U-6 and Later

Models: 73168

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2b. HPR72A(-D) Auxiliary Code U-6 and Later

Transformer Output

10V at 115V

*

*High Pressure Switch

Cut-out	490±10 PSIG

Cut-in	370±20 PSIG

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Hoshizaki 73168 service manual 2b. HPR72A-D Auxiliary Code U-6 and Later

Contents

Superior Degree Reliability Number Issued Revised Hoshizaki AMERICA, INC Contents Page Page Serious injury Important Safety InformationIndicates important information about the use and care UnitDimensions Specifications Nameplate RatingsII. General Information Construction Sequence of Operation Power Switch ON, Rail Cooling Switch OFFPower Switch ON, Rail Cooling Switch Normal or LOW Cabinet Defrost Cool Down RestartRail Defrost Cabinet Defrost Power Switch ON, Rail Cooling Switch OFFOperation Power Switch ON, Rail Cooling Switch OFF CabinetRail Cooling Power Switch ON, Rail Cooling Switch Normal or LOW PositionCabinet and Rail Cooling Control Board Location Control BoardControl Board Layout Front RearAlarm Signal LED Display and Service Lock-OutService Menu Compressor Short Cycle ProtectionTemperature Display Controls and AdjustmentsSwitch Settings Cabinet Defrost Temperature SetpointEnergy Saving Mode Temperature Correction Factor Service Menu Access Service MenuService Menu Chart Control Board Replacement Alarm SignalsControl Board Check Procedure Compressor Protector Thermistor CheckPerimeter Heater Alarm Signals III. Service DiagnosisAlarm Priority Problem Reset, Corrections, and Adjustments Reset Options High Temperature Alarm E1Low Temperature Alarm E2 Cabinet Defrost Alarm E3 High Condenser Temperature Alarm clogged filter E7 5a. Secondary Defrost Thermistor Rail, not used Defrost Thermistor cabinet Malfunction Alarm E8Possible Causes Condenser Thermistor Malfunction Alarm E9 No Operation Service ChartControl Board Alarms EA and ED Cabinet Cooling Problem Possible Cause Remedy Rail Cooling Cabinet Defrost Other Refrigerant Recovery IV. Removal and Replacement of ComponentsService for Refrigerant Lines Evacuation and Recharge R-404A BrazingPage Refrigerant Recovery Procedure Removal and Replacement of Refrigeration System CartridgePage Refrigeration System Pump‑Down Procedure Page Defrost Thermistor Rail Thermistor Removal and Replacement of Compressor Removal and Replacement of Cabinet Evaporator Removal and Replacement of Expansion Valve Removal and Replacement of Liquid Line Valve Removal and Replacement of Condenser Defrost Thermistor Removal and Replacement of Thermistors and ThermostatCabinet Thermistor Rail Thermistor Defrost ThermostatCondenser Thermistor clogged filter Removal and Replacement of Defrost HeaterCabinet Fan Motor Removal and Replacement of Fan MotorsRail Fan Motor Condenser Fan MotorDoor Re-Hinging and Drawer Conversion Removal and Replacement of Door GasketWork Surface Cleaning and Maintenance InstructionsExterior Rail and Rail CoverCabinet Interior Door/Drawer GasketsPower Supply Connection MaintenanceRail Condensate Pan Air FilterShutdown and Long Storage HPR100A-D Refrigeration Circuit VI. Technical InformationHPR46A-D Wiring Diagrams2a. HPR72A-D Auxiliary Code U-5 and Earlier 2b. HPR72A-D Auxiliary Code U-6 and Later Awaiting Data