Hoshizaki BB59, Service Manual

Page 1: ...Service Manual R290 Back Bar Equipment Models BB59 S BB69 S BB80 S BB95 S BB59 G S BB69 G S BB80 G S BB95 G S ...

Page 2: ...__________________________ Serial Number _____________________________ Complete and detailed explanation of the problem WARNING Only qualified service technicians should install and service the appliance To obtain the name and phone number of your local Hoshizaki Certified Service Representative visit www hoshizaki com No installation or service should be undertaken until the technician has thorou...

Page 3: ...er Check 13 D Thermistor Check 14 E Diagnostic Tables 15 III Controller and Adjustments 17 A Controller with Integrated Display 17 1 Controller with Integrated Display 17 a Display Icons 17 b Controller location and Layout 18 c Controller Connections 19 B Temperature 20 1 Default Settings 20 2 Temperature Setpoint 20 3 Changing the Temperature Display Scale F or C 21 C Defrost 21 D Alarm Safeties ...

Page 4: ...ectrical outlet For servicing R290 Models is recommendable be in ventilated area with no source of ignition This appliance requires an independent power supply of proper capacity See name plate for electrical specifications Failure to use an independent power supply of proper capacity can result in a tripped breaker blown fuse damage to existing wiring or component failure This could lead to heat ...

Page 5: ...iance or door or allow children or animals to do so Do not climb into the appliance or allow children or animals to do so Death or serious injury could occur or the appliance could be damaged Be careful not to pinch fingers when opening and closing the door Be careful when opening and closing the door when children are in the area Open and close the doors with care Doors opened too quickly or forc...

Page 6: ...ift the appliance by the top panel or remove the top panel Do not leave the doors open WARNING continued Do not block air inlets or outlets otherwise cooling performance may be reduced Do not tightly pack the cabinet Allow some space between items to ensure good air flow Also allow space between items and interior surfaces Do not store unpackaged product in the appliance the appliance is for pre p...

Page 7: ...7 I General Information A Construction ...

Page 8: ...8 B Refrigeration Flow Chart ...

Page 9: ...9 II Sequence of Operation and Service Diagnosis A Sequence of Operation Flow Charts 1 Refrigerator ...

Page 10: ... next to ovens grills or other high heat producing equipment The appliance must not be located in a corrosive environment The appliance must be a minimum of 2 5 cm from side walls IMPORTANT The maximum allowable voltage variation is 10 percent of the nameplate rating 115VAC is used as a reference voltage when checking voltage to components Voltage may vary depending on power supply B Service Diagn...

Page 11: ...up Cool Down EvapFM energize There is a slight delay of 3 min then Comp and ConFM energize Cabinet temperature appears in the Display a EvapFM Diagnosis Confirm EvapFM energizes If not check for 115VAC at EvapFM terminal connection in Brown and White wire If 115VAC is not present check continuity between the Brown wire at power switch at the ON position and Brown wire at EvapFM terminal If there i...

Page 12: ...binet does not cool down check for a restriction in the refrigeration circuit check the suction pressure and correct refrigerant charge see VIII Technical information 8 Cool Down Achieved CTh cools to Setpoint of 32 F 0 C EvapFM continue on Comp and CondFM de energize Diagnosis Confirm Comp and CondFM de energize If not and Comp and CondFM were energized longer than 3 min check if the Comp icon in...

Page 13: ...ng connections and power switch continuity 4 Check that the cabinet temperature is displayed on remote display If not replace the controller 5 Check that Comp icon appears in the display and the Comp and CondFM there is energized If not check CTh status See II D Thermistor Check If CTh ohm reading is in proper range check for 115VAC at terminals 5 Black Smooth to neutral 7 White If 115VAC is not p...

Page 14: ...m the compressor operates on a fixed time basis of 20 min on and 15 min off To check thermistor resistance follow the steps below 1 Move the power switch to the OFF position then unplug the appliance 2 Remove the control box cover 3 Disconnect and remove the thermistor 4 Check the resistance between the wires at the thermistor Normal reading is within 10 kΩ at 77 F of ambient 6 Reconnect and repla...

Page 15: ...nd two section cords and plugs a Loose connection b Defective 3 Power Switch control box a OFF position b Defective 4 Wiring a Loose connection b Faulty 5 Controller See III D Alarm Safeties and II C Controller Check a In alarm or shown on display b Defective 6 Evaporator Fan Motor a Defective 7 Compressor Relay a Defective 8 Compressor Protector a Dirty condenser b Condenser fan motor not operati...

Page 16: ...fective 6 Refrigerant Charge Refrigerant Lines a Low b Component restriction cap tube drier 3 Defrost Controller Refrigerator Defrost Fails to Initiate Possible Cause 1 Compressor Relay a Defective 2 Controller a Defective b Energy loss or restored before the compliance of 6 hr Refrigerator Defrost Fails to Terminate Possible Cause 1 Compressor Relay a Defective 2 Controller a Defective ...

Page 17: ... terminals Do not short out power supply to test for voltage Not visible in the controller Not visible in the controller Not visible in the controller III Controller and adjustments A Controller with Integrated Display 1 Controller with Integrated Display All models are pretested and factory set a Display Icons ...

Page 18: ...18 b Controller Location and Layout Door to access condensing unit and control box Controller Controller Power Switch Turn On Off Appliance Lamp Switch Turn On Off The Lamp ...

Page 19: ...ck 8 9 Compressor Icon Cabinet Temperature Press to change the temperature setpoint In setpoint mode press to lower temperature otherwise press and hold to initiate manual defrost In setpoint mode press to raise temperature otherwise press and hold to turn compressor on or off without unplugging or using power switch ...

Page 20: ...ds to be changed follow the steps below Press the SET button for two seconds You should see flashing the number 32 this the default set point Release the button Press the UP or DOWN arrows arrows to increase or decrease the set temperature Then press the SET button to save the new set point Note The maximum value you can set in the controller is 36 F If you wish to decrease the setpoint press the ...

Page 21: ...n scroll until EZY is displayed Press the SET button 1 is displayed Press the UP arrow button to display the number 2 then press and hold the SET button for 5 sec Temperature is now displayed in the new display scale C Defrost Manual Defrost To select manual defrost hold the DOWN arrow button for 5 sec The snow flake icon will appear on the display When this icon is solid it indicates that the equ...

Page 22: ...y resets when temperature returns to normal LO Low Temperature Alarm Refrigerator Cabinet temperature has remained below 26 F 3 3 C for more than 2hrs Beeps continually To silence the alarm press and release the SET button The alarm icon stays on Automatically resets when temperature returns to normal E Safety Device 1 Compressor External or Internal Protector If combined temperature amperage valu...

Page 23: ...ctor 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 134a a mixture with pressurized air for leak testing NOTICE Do not leave the system open for longer than 15 min when replacing or servicing parts The Polyol Ester POE oils used in R 134a R 404A or R290 appliances ...

Page 24: ...xture with pressurized air for leak testing NOTICE Always install a new drier every time the sealed refrigeration system is opened 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 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do no...

Page 25: ...low the oil in the vacuum pump to flow backwards 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 4 Close the low side valve on the gauge manifold 5 Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder Remember to loosen the connection and purge the air from the hose See the nameplate for the requ...

Page 26: ...e a throttling valve or liquid dispensing device to add the remaining liquid charge through the low side access valve with the appliance running 11 Close gauge manifold valves and disconnect the hoses 12 Cap the access valve to prevent a possible leak B Important Notes for Component Replacement V Maintenance Components Notes Compressor Install a new start relay start capacitor and compressor prote...

Page 27: ...tch is in the OFF position before plugging in or unplugging the appliance to reduce the risk of electric shock WARNING 1 Condenser Check the condenser once a year and use a brush or vacuum cleaner to clean the condenser as required 2 Power Supply Connection If a plug power cord or receptacle three section models is damaged replace it Be sure to connect the ground wire VI Preparing the Appliance fo...

Page 28: ...ove the door to reduce the risk of children getting trapped Leave the shelves in place so that children may not easily climb inside WARNING VII Disposal The appliance contains refrigerant and must be disposed of in accordance with applicable national state and local codes and regulations Refrigerant must be recovered by properly certified service personnel ...

Page 29: ... for electrical and refrigerant data The nameplate is located inside the cabinet at the left side Pressure suction measure at 90 F ambient temperature models ending in S means stainless steel finish We reserve the right to make changes in specifications and design without prior notice ...

Page 30: ...30 B Wiring Diagram For models BB59 S BB59 G S BB69 S BB69 G S BB80 S BB80 G S BB95 S BB95 G S ...