Hoshizaki 73168 Cabinet Defrost Power Switch ON, Rail Cooling Switch OFF, Rail Defrost

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a)Cabinet Defrost: Power Switch "ON," Rail Cooling Switch "OFF"

CLLV continues, CabFM, Comp, ConFM, and PH de-energize. DH energizes and warms DTh to 49°F (9.4°C) (or the 100-minute defrost termination timer expires or DTst warms to 120°F±5°F (49°C±3°C)). When DTh reaches 49°F (9.4°C), DH deenergizes, CLLV continues and a 5 minute Comp delay timer starts. When the 5-minute Comp delay timer expires, CabFM and PH energize for 10 seconds. Comp and ConFM then energize and a 5-minute CabFM and PH delay timer starts. After the 5-minute CabFM and PH delay timer expires, CabFM and PH energize.

b)Cabinet Defrost: Power Switch "ON," Rail Cooling Switch "NORMAL" or "LOW"

(1)Cabinet cool down achieved, rail still cooling

Comp, CondFM, RailFM, and RLLV continue. CabFM and PH deenergize, and CLLV remains de-energized. DH energizes and warms DTh to 49°F (9.4°C) (or the 100-minute defrost termination timer expires or the DTst warms to 120°F±5°F (49°C±3°C)). When DTh reaches 49°F (9.4°C), DH deenergizes, Comp, ConFM, RailFM, and RLLV continue. CabFM and PH energize for 10 seconds. CLLV then energizes and a 5-minute CabFM and PH delay timer starts. After the 5-minute CabFM and PH delay timer expires, CabFM and PH energize.

(2)Cabinet still cooling, rail cool down achieved

RailFM continues (RailFM continues when rail switch is in the "NORMAL" position and per F9 setting when in the "LOW" position), RLLV and DH energize,

CabFM, Comp, ConFM, and PH de-energize. CLLV de-energizes for 2 seconds, then energizes again. DH warms DTh to 49°F (9.4°C) (or the 100-minute defrost termination timer expires or the DTst warms to 120°F±5°F (49°C±3°C)). When DTh reaches 49°F (9.4°C), DH deenergizes, RailFM continues, RLLV deenergizes, CLLV energizes, and a 5-minute Comp delay timer starts. When the 5-minute Comp delay timer expires, CLLV and RailFM continue. CabFM and PH energize for 10 seconds. Comp and ConFM then energize and a 5-minute CabFM and PH delay timer starts. After the 5-minute CabFM and PH delay timer expires, CabFM and PH energize.

6. Rail Defrost

For rail defrost (manual defrost), remove product from the rail area and store in a properly refrigerated area, then move the rail cooling switch to the "OFF" position.

Legend: CabFM–cabinet fan motor; CB–control board; Comp–compressor; ConFM–condenser fan motor; CLLV–cabinet liquid line valve; CTh–cabinet thermistor; DH–defrost heater; DT–defrost timer; DTh–defrost thermistor; DTst–defrost thermostat; PH–perimeter heater; RailFM–rail fan motor; RLLV–rail liquid line valve; RTh–rail thermistor

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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 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 RearCompressor Short Cycle Protection LED Display and Service Lock-OutAlarm Signal Service MenuTemperature 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 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