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15

1. Diagnostic Procedures

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.

See the table for default cabinet temperature control dial settings.

Model

Default Cabinet Temperature
Control Dial Setting

Approximate Default Temperature

UR/WR - Undercounter/Worktop

5

Refrigerator: 34°F (1°C)

SR - Prep Table

5

Refrigerator 34°F (1°C)

UF/WF - Undercounter/Worktop

7

Freezer: -5°F (-21°C)

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.
Confirm that the appliance location meets factory requirements:

• This appliance is not intended for outdoor use. Normal operating ambient

temperature:
– All UR/WR and Solid Door UF/WF 45°F to 100°F (7°C to 38°C)
– SR 45°F to 86°F (7°C to 30°C)
– UF Glass Door 45°F to 80°F (7°C to 27°C).

• The appliance should not be located next to ovens, grills, or other high heat

producing equipment. Check CM using the steps in "II.C. Control Module Check."

Note: • When checking voltage (115VAC), always choose a neutral white (W) wire to

establish a good neutral connection.

• Control module has high and low voltage protection. If off on either protection,

no LED is visible and all components are off.
High Voltage: 140VAC
Low Voltage: 90VAC

• There is a 2 min. minimum compressor on time for all models and a

2-min. minimum compressor off time for UR/WR and SR and a 3-min. minimum
compressor off time for UF/WF.

• The control module incorporates LEDs

to identify sequence of operation.
Reference the table below to assist in
the diagnostic process.

CONTROL MODULE LED OPERATION

LEDs

LED OPERATION

R

Y

G

X

X

5-SEC. DELAY

X

X

SYSTEM ON

X

X

CTh SATISFIED; SYSTEM OFF

X

X

2-MIN. ON/OFF DELAY

X

DEFROST/DTh FAULT
SYSTEM OFF

X

CTh FAULT

LED OPERATION LEGEND

CYCLING CTh - CABINET THERMISTOR

FLASHING DTh - DEFROST THERMISTOR

ON

X

OFF

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Содержание Steelheart B Series

Страница 1: ...Models Undercounter Worktop Prep Table Refrigerated Kitchen Equipment Steelheart B Series Service Manual Number 73247 Issued 3 22 2021 Revised 6 16 2021 hoshizakiamerica com ...

Страница 2: ...improper installation is not covered under warranty Hoshizaki provides this manual primarily to assist qualified service technicians in the service of the appliance Should the reader have any questions or concerns which have not been satisfactorily addressed please call send an e mail message or write to the Hoshizaki Technical Support Department for assistance Phone 1 800 233 1940 770 487 2331 Fa...

Страница 3: ...1 1 UR WR Refrigerator 11 2 SR Refrigerator 12 3 UF WF Freezer 13 B Service Diagnosis 14 C Control Module Check 20 D Thermistor Check 23 E Diagnostic Table 24 III Controls and Adjustments 27 A Temperature Settings 27 B Defrost 28 C Safety Devices 29 D Perimeter and Mullion Heaters UF WF only 29 IV Refrigeration Circuit and Component Service Information 30 A Refrigeration Circuit Service Informatio...

Страница 4: ...ury WARNING Indicates a hazardous situation that if not avoided could result in death or serious injury NOTICE Indicates a situation that if not avoided could result in damage to the appliance or property IMPORTANT Indicates important information about the use and care of the appliance Risque De Feu Ou D Explosion Le Frigorigène Est Inflammable Suivre attentivement les instructions de manipulation...

Страница 5: ...ion or fire THE APPLIANCE MUST BE GROUNDED The appliance is equipped with a NEMA 5 15 three prong grounding plug to reduce the risk of potential shock hazards It must be plugged into a properly grounded independent 3 prong wall outlet If the outlet is a 2 prong outlet it is your personal responsibility to have a qualified electrician replace it with a properly grounded independent 3 prong wall out...

Страница 6: ... 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 doors drawers or rail cover SR models or when handling food pans Be careful when opening and closing the doors drawers or rail cover when children are in the area Open and close the doors drawers and rail cover SR mo...

Страница 7: ...revent damage to the floor Keep ventilation openings in the appliance enclosure or in the built in structure clear of obstruction Do not place anything on top of the appliance in an undercounter installation There must be at least 1 5 4 cm overhead clearance for proper ventilation The factory installed rear bumpers must be in place to ensure proper rear clearance Blockage of airflow could negative...

Страница 8: ...struction 1 Solid Door Models Compressor Condenser Fan Motor Condenser Rear Panel Thermometer Door Door Gasket Nameplate Evaporator Evaporator Fan Evaporator Fan Shroud Control Module with Cabinet Temperature Control Dial Model Shown UR27B Model Shown UR27B ...

Страница 9: ...n Motor Condenser Rear Panel Thermometer Door Door Gasket Nameplate Evaporator Evaporator Fan Evaporator Fan Shroud Control Module with Cabinet Temperature Control Dial Model Shown UR27B GLP01 Channel Model Shown UR27B GLP01 LED Driver LED Lights ...

Страница 10: ...on Circuit Diagram Evaporator Fans 1 2 or 3 depending on model Evaporator Compressor Drier Condenser Fan Condenser SR and UF WF Models Defrost Heater Capillary Tube Cabinet Thermistor Defrost Thermistor Condensate Pan ...

Страница 11: ...ized ConFM de energized EvapFM de energized UR WR Refrigerator Sequence Flow Chart 2 Cool Down Achieved 4 Defrost CTh above setpoint CTh cools to setpoint CTh above setpoint Defrost Termination 45 F 7 2 C achieved or 55 min maximum DT terminated CTh in control 1 hr DLT terminates Evap temp at or below 4 F 20 C or 5 hr DT terminates 5 min min DT starts 55 min max DT starts Comp de energized ConFM d...

Страница 12: ... LED On 10 sec Delay Legend Comp compressor ConFM condenser fan motor CTh cabinet thermistor DH defrost heater DT defrost timer DTh defrost thermistor EvapFM evaporator fan motor Note a 2 min minimum Comp on timer starts when Comp energizes b 2 min minimum Comp off timer starts when Comp de energizes c 5 hr cumulative compressor run time defrost timer d 5 min minimum defrost time e 45 min maximum ...

Страница 13: ...e a 2 min minimum Comp on timer starts when Comp energizes b 3 min minimum Comp off timer starts when Comp de energizes c 5 min minimum defrost time d 1 hr maximum defrost time e 3 min Comp ConFM delay timer starts when defrost termination temperature is met drip off time DOT f 1 hr defrost lock out time after defrost terminated DLT g 3 min EvapFM delay timer terminates or DTh reaches 10 F 12 C FD...

Страница 14: ...t le frigorigène Risque de feu ou d explosion si la tubulure contenant le frigorigène est perforée suivre les instructions de manutention avec soin Les pièces des composants doivent être remplacées par des pièces et accessoires équivalents L entretien doit être effectué par le personnel de service autorisé par le fabricant afin de minimiser les risques d inflammation attribuables à l installation ...

Страница 15: ... F to 100 F 7 C to 38 C SR 45 F to 86 F 7 C to 30 C UF Glass Door 45 F to 80 F 7 C to 27 C The appliance should not be located next to ovens grills or other high heat producing equipment Check CM using the steps in II C Control Module Check Note When checking voltage 115VAC always choose a neutral white W wire to establish a good neutral connection Control module has high and low voltage protectio...

Страница 16: ... Thermistor Check If CTh ohm reading is in proper range replace CM Comp If 115VAC is present check Comp external overload start or run cap if applicable PTC relay or start relay and Comp motor windings Replace as needed ConFM If 115VAC is present check fan blade for binding then check ConFM motor windings If Comp ConFM and EvapFM are energized and the cabinet does not cool down check for a restric...

Страница 17: ...er clockwise to position 2 yellow LED turns off and red LED turns on move back clockwise again to position 8 red LED remains on and green LED turns on Defrost initiates Note Once at the number position confirm the appropriate LEDs turn off and on If not move the CTCD back and forth until the LED turns on Once the LED is on move to the next position 1b Temperature Initiation 1 UR WR DTh is at or be...

Страница 18: ...s Note Once at the number position confirm the appropriate LEDs turn off and on If not move the CTCD back and forth until the LED turns on Once the LED is on move to the next position After several attempts and the LEDs do not turn on and off as listed above replace the CM If defrost does not initiate after all the LEDs properly turn on and off replace the CM Once initiated see component diagnosis...

Страница 19: ...D Thermistor Check Replace as needed If DTh confirmed replace CM Once defrost termination achieved EvapFM continues Comp and ConFM energize If not see 4 Startup Cool down above b SR DTh warms to 46 F 7 7 C DH de energizes Confirm continuity of DTh See II D Thermistor Check Replace as needed If DTh is good and DH continues after DTh achieves 46 F 7 7 C replace CM Comp ConFM and EvapFM energize If n...

Страница 20: ...lack BK wire and CM Neutral white W wire Confirm defrost and cabinet thermistors are connected Neutral W Power Supply BK Compressor V Evaporator Fan Motor BK SM Defrost Heater BK SM Control Dial PRB 2 Defrost Thermistor PRB 1 Cabinet Thermistor Red LED Yellow LED Green LED Fig 1 2 Cabinet Temperature Control Dial shown in OFF position Cabinet Thermometer located on shelf Cabinet Temperature Contro...

Страница 21: ...lid green yellow and red LEDs then yellow LED turns on for 10 sec Yellow LED turns off and a solid green LED turns on normal cooling cycle Unless 2 min Comp delay timer is on CTh Diagnosis If green and yellow LEDs flashing CTh fault code check CTh for continuity and good connection to CM See II D Thermistor Check 1 Check all wiring connections 2 Be sure the power supply is connected to the electri...

Страница 22: ...ck BK wire to neutral white W wire If 115VAC is not present replace CM 4 Defrost Termination 8 Check that all components restart after defrost termination a UR WR DTh warms to 45 F 7 2 C Confirm continuity of DTh See II D Thermistor Check Replace as needed If DTh confirmed replace CM b SR DTh warms to 46 F 7 7 C DH de energizes Confirm continuity of DTh See II D Thermistor Check Replace as needed ...

Страница 23: ...the thermistors and cabinet temperature control dial CTCD to control system operation No adjustment is required To check thermistor resistance follow the steps below 1 Unplug the appliance from the electrical outlet 2 Remove the evaporator shroud and rear louver 3 Disconnect the thermistor connector from the control module 4 Remove the thermistor in question then immerse the thermistor sensor port...

Страница 24: ...t be in place Otherwise the rail will not cool properly Make sure product is not blocking airflow and that the cabinet is not overloaded with warm or hot product Product should be allowed to cool before putting in the appliance On SR models only load ingredients that have been pre chilled to 37 F 3 C or less Check for correct installation and proper voltage per appliance nameplate This appliance i...

Страница 25: ...xternal Protector a Dirty condenser b Condenser fan motor not operating c Start or PTC relay defective d Start or Run capacitor if applicable defective e Defective f Low charge 9 Compressor a Defective 10 Condenser a Dirty 11 Evaporator a Dirty or frozen up 12 Refrigerant Refrigerant Lines a Low b Refrigerant lines or components restricted 2 Evaporator is Frozen Up Evaporator is Frozen Up Possible...

Страница 26: ...firm DTh status See II D Thermistor Check a Defective SR and UF WF Defrost Possible Cause 1 Control Module fails to initiate See II C Control Module Check a Defective Cumulative 5 hr defrost timer fails 2 Defrost Safety Thermostat a Defective Open Cut out 120 F 5 F 49 C 3 C Cut in 70 F 5 F 21 C 3 C 3 Defrost Heater a Defrost safety thermostat open b Defective 4 Defrost Thermistor Confirm DTh statu...

Страница 27: ...CD The warmest setting is 1 and the coldest setting is 9 See the table for default cabinet temperature control dial settings Model Default Cabinet Temperature Control Dial Setting Approximate Default Temperature UR WR Undercounter Worktop 5 Refrigerator 34 F 1 C SR Prep Table 5 Refrigerator 34 F 1 C UF WF Undercounter Worktop 7 Freezer 5 F 21 C Fig 1 Thermometer Cabinet Temperature Control Dial sh...

Страница 28: ...or temperature defrost thermistor achieves a UR WR 4 F 20 C or lower b SR No temperature initiation Time only c UF WF 31 F 35 C or lower Defrost initiates 1 hr defrost lockout between defrost on UR WR and UF WF Time Initiation 5 hr cumulative compressor run timer terminates defrost initiates a UR WR 5 min minimum and 55 min maximum Evaporator fan motor continues b SR 5 min minimum and 45 min maxim...

Страница 29: ... the compressor external protector operates independently to turn off the compressor The compressor external protector de energizes the compressor until the temperature amperage value returns to an acceptable level D Perimeter and Mullion Heaters UF WF only UF WF are equipped with perimeter and mullion heaters If condensation occurs check continuity of heaters ...

Страница 30: ...ppliance Risque De Feu Ou D Explosion Le Frigorigène Est Inflammable Suivre attentivement les instructions de manipulation conformément à la réglementation gouvernementale Ne pas utiliser d appareils mécaniques pour dégivrer le réfrigérateur Ne pas perforer la tubulure contenant le frigorigène Risque de feu ou d explosion si la tubulure contenant le frigorigène est perforée suivre les instructions...

Страница 31: ... not use mechanical devices to defrost Use non sparking tools Class B dry chemical fire extinguisher or equivalent must be available Do not pressurize system above 200 PSIG during leak check procedure or prior to evacuating refrigeration system This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire To re...

Страница 32: ...e 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 not allow the drier to exceed 250 F 121 C Refrigerant leaks must be repaired as soon as t...

Страница 33: ...area that you are working with a flammable refrigerant Do not use silver alloy or copper alloy containing arsenic Be sure the area is clear of refrigerant vapor before brazing 1 Braze repair replace damaged component or fitting 2 Purge with nitrogen gas for 2 min Then braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 5 PSIG NOTICE Always install a new drier every tim...

Страница 34: ...uid state place the service cylinder on the scales if the service cylinder is not equipped with a dip tube invert the service cylinder then place it on the scales Open the high side valve on the gauge manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 Close the high side valve on the gauge manifold If charging is complete skip to step 10 9 If necessary add an...

Страница 35: ...isk of electric shock be sure to reconnect the compressor s ground wire Cabinet Thermistor After working with or around the cabinet thermistor make sure the cabinet thermistor is in its correct position and secure Defrost Thermistor After working with or around the defrost thermistor on an SR or UF WF make sure the defrost thermistor wire is not touching the defrost heater and the defrost thermist...

Страница 36: ...the doors from closing to reduce the risk of children getting trapped NOTICE Clean the cabinet interior door gaskets and shelves 1 Before shutting down the appliance move the stored food into another refrigerator or freezer 2 Unplug the appliance from the electrical outlet WARNING To reduce the risk of electric shock do not touch the plug with damp hands ...

Страница 37: ...formément à la réglementation gouvernementale Ne pas perforer la tubulure contenant le frigorigène Risque de feu ou d explosion si la tubulure contenant le frigorigène est perforée suivre les instructions de manutention avec soin Éliminer conformément aux règlements fédéraux ou locaux WARNING When preparing the appliance for disposal remove the doors drawers to reduce the risk of children getting ...

Страница 38: ... Data Pending 360 190 Data Pending UF WF48B xx 115 60 1 Data Pending Data Pending UR WR60B xx SR60B xxxxx 115 60 1 Data Pending 360 190 Data Pending UF WF60B xx 115 60 1 Data Pending Data Pending UR WR72B xx SR72B xxxxx 115 60 1 Data Pending 360 190 Data Pending See the nameplate for electrical and refrigeration specifications The nameplate is located inside the cabinet We reserve the right to mak...

Страница 39: ...39 B Wiring Diagrams 1 UR WR27 UR WR36 UR WR48 except glass door and SR36 ...

Страница 40: ...40 2 UF WF27 SR27 and SR48 ...

Страница 41: ...41 3 UR WR48 glass door UR WR60 and UR WR72 ...

Страница 42: ...42 4 UF WF48 UF WF60 SR60 and SR72 ...

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