Hoshizaki 73168 service manual

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13)Slide the refrigeration cartridge forward. Support the evaporator as it clears the evaporator case. See Fig. 2.

CAUTION

1.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.To avoid refrigerant leaks, be sure to prevent the refrigeration piping from coming into contact with the frame when removing and replacing the refrigeration cartridge.

14)Once the repair is made, replace the refrigeration cartridge back into its correct position. Support the cabinet evaporator as it enters the cabinet evaporator case.

15)Reconnect the rail refrigerant tubes. Use a backup wrench and tighten the fittings 1/6 turn beyond fully seated. Be sure to use a backup wrench when tightening the fittings.

16)Secure the rail service valve bracket back in its correct position.

17)Secure the refrigeration cartridge with the attachment nuts, washers, and the hex head bolt.

18)Replace the wire cover and panels in their correct positions.

19)Open the rail high and low-side service valves. Back out the rail service valve stems all the way to their original position and tighten.

Note: Be sure the rail high and low-side service valve stems are backseated all the way out and tight.

20)Run in the receiver service valve stem a couple of turns for high-side system access. Note: Be sure the high-side gauge manifold hose is on the receiver service valve

before opening the receiver service valve.

21)Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

22)Evacuate the system. Then, charge the system with refrigerant; see the nameplate for the required refrigerant charge.

23)Back out the receiver service valve stem all the way and tighten, then close both gauge manifold valves.

Note: Be sure the receiver service valve stem is backseated all the way out and tight.

24)Cap the valves to prevent a possible leak.

25)Reconnect the power supply cord connector, rail thermistor connector, and perimeter heater/rail fan motor connector.

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

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Contents Superior Degree Reliability Number Issued Revised Hoshizaki AMERICA, INC Contents Page Page Unit Important Safety InformationSerious injury Indicates important information about the use and careDimensions Specifications Nameplate RatingsII. General Information Construction Power Switch ON, Rail Cooling Switch Normal or LOW Power Switch ON, Rail Cooling Switch OFFSequence of Operation 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 RearCompressor Short Cycle Protection LED Display and Service Lock-OutAlarm Signal Service MenuSwitch Settings Controls and AdjustmentsTemperature Display Energy Saving Mode Temperature SetpointCabinet Defrost Temperature Correction Factor Service Menu Access Service MenuService Menu Chart Control Board Check Procedure Alarm SignalsControl Board Replacement Perimeter Heater Thermistor CheckCompressor Protector 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 Possible Causes Defrost Thermistor cabinet Malfunction Alarm E85a. Secondary Defrost Thermistor Rail, not used Condenser Thermistor Malfunction Alarm E9 Control Board Alarms EA and ED Service ChartNo Operation Cabinet Cooling Problem Possible Cause Remedy Rail Cooling Cabinet Defrost Other Service for Refrigerant Lines IV. Removal and Replacement of ComponentsRefrigerant Recovery 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 Cabinet Thermistor Removal and Replacement of Thermistors and ThermostatDefrost 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 InstructionsDoor/Drawer Gaskets Rail and Rail CoverExterior Cabinet InteriorAir Filter MaintenancePower Supply Connection Rail Condensate PanShutdown 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