Hoshizaki 73168 service manual Removal and Replacement of Cabinet Evaporator

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15)Replace the panels in their correct positions.

16)Plug in the unit, then move the power switch to the "ON" position to start the unit's cooling process.

D. Removal and Replacement of Cabinet Evaporator

CAUTION

1.Always install a new drier every time the sealed refrigeration system is opened.

2.Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.

3.When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).

1)Remove the refrigeration system cartridge. Perform steps 1 through 14 in "IV.B.1. Recovery Procedure." Once the refrigeration cartridge is out, proceed to step 2.

WARNING

Be careful when handling the cabinet evaporator assembly. This assembly includes a defrost heater sheathed in a glass tube. This sheathing can be easily damaged and may also cause cuts if broken. The defrost heater will also be hot after a defrost. Use gloves when handling and avoid touching the glass directly. Also prevent the defrost heater from touching other parts.

2)Remove the defrost heater, defrost thermostat, defrost and cabinet thermistors from the evaporator. See Fig. 3.

3)Remove the evaporator shroud and evaporator bracket from the evaporator.

4)Remove the insulation tubing, and disconnect the evaporator inlet and outlet tubing.

5)Remove the screws holding the evaporator to the refrigeration system cartridge.

6)Remove the evaporator and drier.

7)Place the new evaporator and new drier in position. Provide a safe means for supporting the evaporator.

Defrost Thermistor

Evaporator Bracket

Defrost Thermostat

Evaporator

Fig. 3

Evaporator Shroud

Cabinet Fan Motors

Defrost Heater

Cabinet Thermistor Bracket Cabinet Thermistor

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Contents Superior Degree Reliability Number Issued Revised Hoshizaki AMERICA, INC Contents Page Page Important Safety Information Serious injuryIndicates important information about the use and care UnitSpecifications Nameplate Ratings DimensionsII. General Information Construction Power Switch ON, Rail Cooling Switch OFF Power Switch ON, Rail Cooling Switch Normal or LOWSequence of Operation Cool Down Restart Cabinet DefrostCabinet Defrost Power Switch ON, Rail Cooling Switch OFF Rail DefrostPower Switch ON, Rail Cooling Switch OFF Cabinet OperationPower Switch ON, Rail Cooling Switch Normal or LOW Position Rail CoolingCabinet and Rail Cooling Control Board Control Board LocationFront Rear Control Board LayoutLED Display and Service Lock-Out Alarm SignalService Menu Compressor Short Cycle ProtectionControls and Adjustments Switch SettingsTemperature Display Temperature Setpoint Energy Saving ModeCabinet Defrost Temperature Correction Factor Service Menu Service Menu AccessService Menu Chart Alarm Signals Control Board Check ProcedureControl Board Replacement Thermistor Check Perimeter HeaterCompressor Protector III. Service Diagnosis Alarm SignalsAlarm Priority Problem Reset, Corrections, and Adjustments High Temperature Alarm E1 Reset OptionsLow Temperature Alarm E2 Cabinet Defrost Alarm E3 High Condenser Temperature Alarm clogged filter E7 Defrost Thermistor cabinet Malfunction Alarm E8 Possible Causes5a. Secondary Defrost Thermistor Rail, not used Condenser Thermistor Malfunction Alarm E9 Service Chart Control Board Alarms EA and EDNo Operation Cabinet Cooling Problem Possible Cause Remedy Rail Cooling Cabinet Defrost Other IV. Removal and Replacement of Components Service for Refrigerant LinesRefrigerant Recovery Brazing Evacuation and Recharge R-404APage Removal and Replacement of Refrigeration System Cartridge Refrigerant Recovery ProcedurePage 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 Removal and Replacement of Thermistors and Thermostat Cabinet ThermistorDefrost Thermistor Defrost Thermostat Rail ThermistorRemoval and Replacement of Defrost Heater Condenser Thermistor clogged filterRemoval and Replacement of Fan Motors Cabinet Fan MotorCondenser Fan Motor Rail Fan MotorRemoval and Replacement of Door Gasket Door Re-Hinging and Drawer ConversionCleaning and Maintenance Instructions Work SurfaceRail and Rail Cover ExteriorCabinet Interior Door/Drawer GasketsMaintenance Power Supply ConnectionRail Condensate Pan Air FilterShutdown and Long Storage Refrigeration Circuit VI. Technical Information HPR100A-DWiring Diagrams HPR46A-D2a. HPR72A-D Auxiliary Code U-5 and Earlier 2b. HPR72A-D Auxiliary Code U-6 and Later Awaiting Data