Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 User Manual

Hoshizaki “A Superior Degree of Reliability” www.hoshizaki.com Model Refrigerated Prep Table with Raised Rail Commercial Kitchen Equipment Hoshiz

10(3) Both CTh and RTh reach 3.6°F (2°C) below setpoint CabFM and PH continue. RailFM continues when rail cooling switch is in the "NORMAL"

11a) Cabinet Defrost: Power Switch "ON," Rail Cooling Switch "OFF"CLLV continues, CabFM, Comp, ConFM, and PH de-energize. DH energ

12C. Sequence of Operation Charts1. Cabinet CoolingLegend:CabFM-cabinet fan motorComp-compressorConFM-condenser fan motorCLLV-cabinet liquid line valv

132. Cabinet and Rail CoolingLegend:C-cabinet coolingCabFM-cabinet fan motorComp-compressorConFM-condenser fan motorCLLV-cabinet liquid line valveCTh-

142. Cabinet and Rail Cooling (continued)4. Cabinet DefrostDTh in control•6‑hourDTexpires,thenresets•100‑minutedefrostterminationtimerstart

15D. Control Board•AHoshizakiexclusivesolid‑statecontrolboardisemployedinallHoshizakiHPR46A(-D), HPR72A(-D), and HPR100A(-D) units.•Allm

16FrontDisplay/Change Rail Setpoint"UP"Button"DOWN"Button"SERVICEUSEONLY"Button"MANUALDEFROST"buttonLED

173. Featuresa) LED Display and Service Lock-OutThis control board uses twin LED displays to show system details and diagnostic information. For contr

184. Controls and AdjustmentsThe cabinet and rail temperatures are updated every 30 seconds. The control board is supplied with a service jumper on th

19Section Temperature Setpoint Range DefaultCabinet21 to 53°F(-6 to +12°C)37°F(3°C)Rail-13 to +53°F(-25 to +12°C)33°F(1°C)c) Temperature SetpointThe t

2IMPORTANTOnly qualied service technicians should install, service, and maintain the unit. No service or maintenance should be undertaken until the t

20f) Temperature Correction FactorIn cases where there is a discrepancy between the actual cabinet or rail temperature and the displayed temperature,

215. Service MenuTheservicemenu("F0"to"F9")maybeusedtochangesettings,acquirediagnosticinformation, and to view alarm

22ServiceMenuItem and DetailsSetting Range Factory DefaultCabinet Rail Cabinet RailF0 Defrost Interval •Thecabinetusesatimeinitiatedheated def

236. Alarm Signals In the event of operation outside of normal parameters, the control board identies the issue with an alarm signal. The alarm sign

24E. Thermistor CheckThermistors (semiconductors) are used for temperature control in the cabinet and rail areas, defrost termination, and for monitor

25III. Service Diagnosis WARNING1. This unit should be disassembled or repaired only by a qualied service technician to reduce the risk of injury, el

26Alarm SignalPriority Problem Reset, Corrections, and AdjustmentsE7 6High Condenser Temperature Alarm (clogged lter) Condenser temperature is outsi

271. High Temperature Alarm (E1)If the cabinet or rail temperature exceeds the setpoint temperature by 18°F (10°C) or moreformorethanxhours,&quo

282. Low Temperature Alarm (E2)If the cabinet or rail temperature drops below the setpoint temperature by 9°F (5°C) or moreformorethanyhours,&qu

293. Cabinet Defrost Alarm (E3)Once the defrost termination temperature is reached, the signal from the defrost thermistor should terminate the defros

3IMPORTANTThis manual should be read carefully before the unit is serviced or maintenance operations are performed. Only qualied service technicians

304. High Condenser Temperature Alarm (clogged lter) (E7)The unit is equipped with a condenser air lter to protect the condenser from dirt, grease,

315. Defrost Thermistor (cabinet) Malfunction Alarm (E8)Ifthecontrolboarddetectsanopendefrostthermistor,"E8"isdisplayed.Whenthe

326. Condenser Thermistor Malfunction Alarm (E9)Ifthecontrolboarddetectsanopencondenserthermistor,"E9"isdisplayed.Whenthecontr

33Problem Possible Cause Remedy[1] The unit will not start.a)Power Supply 1. Unplugged, off, blown fuse, or tripped or defective circuit breaker.1. Tu

34Problem Possible Cause Remedy[3] Compressor will not start or stops operating. (continued)f) Voltage 1. Too low. 1. Call electrician.2. Too high. 2.

35Problem Possible Cause Remedy[1] Cabinet temperature too high. (continued)g) Defrost 1. Defrost time insufficient to remove frost. Operation in hum

363. Rail CoolingProblem Possible Cause Remedy[1] Rail temperature too high.a) Warm Food 1. Warm food recently placed in rail area.1. Pre-cool food or

374. Cabinet Defrost Problem Possible Cause Remedy[1] Cabinet fan motors on.a) Cabinet Fan Relay 1. Bad contacts (closed). 1. Check for continuity an

385. OtherProblem Possible Cause Remedy[1] Condensate water overow.a) Cabinet Contents 1. Loading large volumes of warm, moist, uncovered product.1.

39IV. Removal and Replacement of Components WARNING1. This unit should be diagnosed and repaired only by qualied service personnel to reduce the risk

4III. Service Diagnosis ... 25A. Alarm Signals

402. Brazing WARNING1. R-404A itself is not ammable at atmospheric pressure and temperatures up to 176°F (80°C).2. R-404A itself is not explosive or

413)Allowthevacuumpumptopulldowntoa29.9"Hgvacuum.Evacuatingperioddependson pump capacity.4) Close both gauge manifold valves.5) T

42B. Removal and Replacement of Refrigeration System CartridgeCAUTIONThe refrigeration system cartridge should not be removed until the refrigerant ha

4313) Slide the refrigeration cartridge forward. Support the evaporator as it clears the evaporator case. See Fig. 2.CAUTION1. Be careful when handlin

442. Refrigeration System Pump-Down Procedure 1)Removethefrontpanel.Movethepowerswitchtothe"OFF"position,thenunplugtheunit.2

4516) Once the repair is made, replace the refrigeration cartridge back into its correct position. Support the cabinet evaporator as it enters the cab

46Fig. 2Refrigeration CartridgeCabinet Fan MotorsCabinet ThermistorDefrost ThermistorDefrost ThermostatDefrost HeaterRail ThermistorCabinet Evaporator

47C. Removal and Replacement of CompressorCAUTION1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace

4815) 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&

498) Braze the ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.9) Replace the removed evaporator parts in their correct po

55. Door/Drawer Gaskets ... 596. Shelves (if applicable) ...

50F. Removal and Replacement of Liquid Line ValveCAUTION1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not

51G. Removal and Replacement of CondenserCAUTION1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace

52H. Removal and Replacement of Thermistors and ThermostatCAUTION1. The thermistors are fragile; handle very carefully.2. Do not shorten or cut the th

533. Defrost Thermostat1)Removetherefrigerationsystemcartridge.Performsteps1through16in"IV.B.2.Pump‑DownProcedure."Oncether

54I. Removal and Replacement of Defrost HeaterCAUTIONBe careful when handling both the old and new defrost heaters. The heaters are sheathed in glass

55J. Removal and Replacement of Fan Motors1. Cabinet Fan MotorCAUTION Be careful when handling the evaporator shroud assembly. This assembly includes

562. Condenser Fan Motor1)Openthefrontpanel.Movethepowerswitchtothe"OFF"position,thenunplugtheunit.2) Remove the left side p

57K. Removal and Replacement of Door GasketRemove the old gasket by pulling it directly out of the vinyl gasket retainer. Thoroughly clean the gasket

58V. Cleaning and Maintenance InstructionsA. Cleaning WARNING1.Beforecleaningtheunit,movethepowerswitchtothe"OFF"positionandun

592. Rail and Rail CoverSpills and splashes should be wiped up promptly to avoid unpleasant odors. Wipe the interior of the rail and the rail cover re

6Important Safety InformationThroughout this manual, notices appear to bring your attention to situations which could result in death, serious injury,

60B. Maintenance1. Rail Condensate PanThe rail condensate pan collects condensate water from the rail. Empty the pan as often as necessary depending o

61C. Shutdown and Long StorageWARNING1. When preparing the unit for long storage, prevent the doors/drawers from closing to reduce the risk of childre

62VI. Technical Information A. Refrigeration Circuit1. HPR46A(-D), HPR72A(-D), HPR100A(-D)Note: The number of rail fans varies between models.FrontCab

63B. Wiring Diagrams1. HPR46A(-D)*High Pressure SwitchCut-out 490±10 PSIGCut-in 370±20 PSIGTransformer Output 10V at 115V*

642a. HPR72A(-D) Auxiliary Code U-5 and Earlier*High Pressure SwitchCut-out 490±10 PSIGCut-in 370±20 PSIGTransformer Output 10V at 115V*

652b. HPR72A(-D) Auxiliary Code U-6 and LaterTransformer Output 10V at 115V**High Pressure SwitchCut-out 490±10 PSIGCut-in 370±20 PSIG

663. HPR100A(-D)AWAITING DATA

7I. SpecicationsA. Nameplate RatingsModel AC Supply Voltage AmperesDesign Pressure (PSIG) Refrigerant HI LO 404AHPR46A(-D)115/60/17. 6450 25028.5 oz.

8II. General Information A. ConstructionThis Hoshizaki unit features a cartridge-type refrigeration system that can be removed (excluding the rail eva

9B. Sequence of OperationThe steps in the sequence are as outlined below. 1. Startup Whenthepowerswitchisinthe"ON"position,thecabi