Hoshizaki 73168 service manual Removal and Replacement of Condenser

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G. Removal and Replacement of Condenser

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)Move the power switch to the "OFF" position, then unplug the unit.

2)Remove the panels.

3)Remove the refrigeration system cartridge. Perform steps 1 through 14 in "IV.B.1. Recovery Procedure." Once the refrigeration system cartridge is out, proceed to step 4.

4)Remove the condenser thermistor (clogged filter).

5)Disconnect the condenser inlet and outlet piping.

6)Remove the condenser assembly.

7)Remove the air guide, evaporator case cover bracket, and condenser shroud (A) from the old condenser and attach it to the new condenser. See Fig. 4.

8)Place the new condenser assembly in position.

9)Remove the drier, then place the new drier in position.

10)Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.

11)Replace the condenser thermistor (clogged filter) in its correct position.

12)Once the repair is complete, return to step 15 in "IV.B.1. Recovery Procedure" for refrigeration system cartridge replacement.

Evaporator Case

Cover Bracket

Condenser

Condenser Shroud (A)

Air Guide

Condenser Thermistor (clogged filter)

Fig. 4

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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 OFF Power Switch ON, Rail Cooling Switch Normal or LOWSequence 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 MenuControls and Adjustments Switch SettingsTemperature Display Temperature Setpoint Energy Saving ModeCabinet Defrost Temperature Correction Factor Service Menu Access Service MenuService Menu Chart Alarm Signals Control Board Check ProcedureControl Board Replacement Thermistor Check Perimeter HeaterCompressor 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 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 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 Removal and Replacement of Thermistors and Thermostat Cabinet ThermistorDefrost 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