Related Manuals for Hoshizaki Steelheart UR/WR27B Series
Summary of Contents for Hoshizaki Steelheart UR/WR27B Series
- Page 1 Service Manual Refrigerated Kitchen Equipment Steelheart B Series Models Undercounter Worktop Prep Table Number: 73247 Issued: 3-22-2021 hoshizakiamerica.com Revision: 7-6-2022...
- Page 2 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 Fax: 1-800-843-1056;...
- Page 3 IMPORTANT This manual should be read carefully before the appliance is serviced. Read the warnings and guidelines contained in this booklet carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this booklet for any further reference that may be necessary. CONTENTS Important Safety Information ....................
- Page 4 Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property. Indicates a hazardous situation that, if not avoided, will result in DANGER death or serious injury.
- Page 5 • THE APPLIANCE MUST BE WARNING GROUNDED. The appliance is equipped The appliance should be destined only to with a NEMA 5-15 three-prong grounding the use for which it has been expressly plug to reduce the risk of potential conceived. Any other use should be shock hazards.
- Page 6 • Do not block air inlets or outlets, otherwise WARNING, continued cooling performance may be reduced. • Children should be properly supervised • Do not tightly pack the cabinet. Allow some around the appliance. space between items to ensure good air •...
- Page 7 NOTICE WARNING, continued • Protect the floor when moving the Additional Warnings for SR Models appliance to prevent damage to the floor. • The entire rail must always be covered • Keep ventilation openings, in the by rail dividers and pans (1/6 size, up appliance enclosure or in the built-in to 6" (15 cm) deep).
- Page 8 I. Construction and Refrigeration Circuit Diagram A. Construction Solid Door Models • Evaporator • Evaporator Fan • Evaporator Fan Shroud Thermometer Nameplate Door Control Module with Cabinet Temperature Control Dial Door Gasket Model Shown: UR27B Condenser Compressor Condenser Fan Motor Rear Panel Model Shown: UR27B...
- Page 9 Glass Door Models • Evaporator • Evaporator Fan • Evaporator Fan Shroud Thermometer Nameplate LED Lights Door Door Gasket Control Module with Cabinet Temperature Control Dial Model Shown: UR27B-GLP01 LED Driver Channel Condenser Compressor Condenser Fan Motor Rear Panel Model Shown: UR27B-GLP01...
- Page 10 B. Refrigeration Circuit Diagram Condenser Condenser Fan Drier Capillary Tube Compressor Condensate Pan Evaporator Fans Cabinet Thermistor (1, 2, or 3 depending on model) Evaporator Defrost Thermistor SR and UF/WF Models: Defrost Heater...
- Page 11 II. Sequence of Operation and Service Diagnosis The steps in the sequence are as outlined below. A. Sequence of Operation Flow Chart 1. UR/WR: Refrigerator...
- Page 12 2. SR: Refrigerator...
- Page 13 3. UF/WF: Freezer...
- Page 14 B. Service Diagnosis Risque De Feu Ou D'Explosion DANGER Le Frigorigène Est Inflammable Risk of Fire or Explosion • Suivre attentivement les instructions Flammable Refrigerant Used de manipulation conformément à la • Follow handling instructions carefully réglementation gouvernementale. in compliance with U.S. government •...
- Page 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 Approximate Default Temperature...
- Page 16 1) Unplug the appliance from the electrical outlet. 2) Remove the CM mounting bracket and place the CM in a place where the LEDs are visible. 3) Plug the appliance back into the electrical outlet. If appliance was in defrost when power supply was disconnected, defrost is terminated and normal cooling cycle begins.
- Page 17 5) Cool Down Achieved–CTh reaches setpoint temperature. All Models: Comp and ConFM de-energize. UR/WR and UF/WF: EvapFM de-energize. SR: EvapFM continues. Diagnosis: If temperature setpoint achieved and Comp, ConFM, and EvapFM does not de-energize (except SR), check CTh continuity. See "II.D. Thermistor Check." If CTh is defective, replace.
- Page 18 2a) Manually-Terminated: Set the CTCD to the off position, then back to original setting or unplugging and plugging back in to the electrical outlet. Defrost terminated. 2b) Temperature or Time Terminated: (1) UR/WR: 45°F (7.2°C) achieved or 55-min. backup DT terminates. If CTh calling for cooling, Comp and ConFM energize.
- Page 19 (3) EvapFM Diagnosis UR/WR: EvapFM continues. If not, check for 115VAC at CM AUX 1 black-smooth (BK-SM) wire to a neutral white (W). If 115VAC is not present, replace CM. SR and UF/WF: Confirm EvapFM de-energizes. If not, check for 115VAC at CM AUX 1 black-smooth (BK-SM) to a neutral white (W).
- Page 20 C. Control Module Check 1. Control Module Before replacing a CM that does not show a visible defect and that you suspect is bad, conduct the following check procedure. This procedure will help you verify your diagnosis. Always choose a neutral white (W) wire to establish a good power supply and neutral connection to CM.
- Page 21 1a. Control Module LED Operation: The control module has 3 LEDs that illuminate based on the status of the thermistors. Red (R), Yellow (Y), and Green (G). a) Warm Cabinet Thermistor - Power on: All 3 LEDs turn on for 2 sec. then turn off. Next, yellow (Y) LED turns on for 10 sec.
- Page 22 3. Defrost Initiation 5) Manual Defrost Check: Unplug the appliance from the electrical outlet, then move the CTCD to the off position. Plug appliance back into the electrical outlet. The CM green, yellow, and red LED turn on. Rotate the CTCD clockwise to position 4 (green and red LED turn off, yellow LED remains on), move Counter-clockwise to position 2 (yellow LED turns off and red LED turns on), move back clockwise to position 8 (red LED remains on and green LED turns on).
- Page 23 D. Thermistor Check The cabinet thermistor works in conjunction with cabinet temperature control dial (CTCD) to control cabinet temperature. The defrost thermistor is used for defrost initiation and termination on all models and evaporator fan motor restart on UF/WF. • UR/WR: Defrost termination is 45°F (7.2°C). •...
- Page 24 E. Diagnostic Table Before consulting the diagnostic tables, check the following: • Check the cabinet temperature control dial setting. See the table for default cabinet temperature control dial settings. Model Default Cabinet Temperature Approximate Default Control Dial Setting Temperature UR/WR - Undercounter and Worktop Refrigerator: 34°F (1°C) SR - Prep Table Refrigerator: 34°F (1°C)
- Page 25 1. Appliance Not Cooling Appliance Not Cooling - Possible Cause Power Supply Unplugged, blown fuse, or tripped or defective circuit breaker. Loose connection. Not within specifications. Power Supply Cord and Plug Loose connection. Defective. Wiring Loose connection or disconnected. Defective. Cabinet Thermistor Loose, disconnected, or defective.
- Page 26 3. Defrost UR/WR Defrost - Possible Cause 1. Control Module (fails to initiate) a) Defective-Cumulative 5-hr. defrost timer fails. See "II.C. Control Module Check" b) Defective-1-hr. defrost lock-out timer fails. 2. Control Module (fails to terminate) a) Defrost thermistor connection loose. See "II.C.
- Page 27 III. Controls and Adjustments A. Temperature Settings 1. Temperature Reading A thermometer with both °F and °C scales is mounted in the cabinet. See Fig. 1. 2. Cabinet Temperature The appliance features a cabinet temperature control dial (CTCD). The warmest setting is 1 and the coldest setting is 9.
- Page 28 B. Defrost There are 2 types of defrost: Off Cycle Defrost (with evaporator fan motor) and Heated Defrost (without evaporator fan motor). Manual Initiation (All Models): Unplug the appliance from the electrical outlet,then move the cabinet temperature control dial to the off position. Plug the appliance back into the electrical outlet.
- Page 29 C. Safety Devices 1. Compressor External Protector (All Models) If combined temperature/amperage value is above the limit specified by the compressor manufacturer, 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.
- Page 30 IV. Refrigeration Circuit and Component Service Information DANGER Risk of Fire or Explosion Flammable Refrigerant Used • Follow handling instructions carefully in compliance with U.S. government regulations. • Do not use mechanical devices to defrost. • Do not puncture refrigerant tubing. Risk of fire or explosion due to puncture of refrigerant tubing;...
- Page 31 WARNING • Wear appropriate personal protective equipment (PPE) when servicing the appliance. • Technician must utilize a combustible gas leak detector at all times. • Notify everyone in the immediate area that you are working with flammable refrigerant. • Do not work on appliance in a confined space. Confirm area is well ventilated. •...
- Page 32 A. Refrigeration Circuit Service Information WARNING • Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA-certified service personnel. • Use an electronic leak detector 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).
- Page 33 2. Brazing DANGER Risk of Fire or Explosion Flammable Refrigerant Used • Servicing shall be done by factory authorized service personnel to minimize the risk of possible ignition due to incorrect parts or improper service. Risque De Feu Ou D'Explosion Le Frigorigène Est Inflammable •...
- Page 34 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. For the required refrigerant charge, see the nameplate. Hoshizaki recommends only virgin or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.
- Page 35 B. Component Service Information NOTICE When replacing a component listed below, see the notes to help ensure proper operation. Component Notes Compressor Install a new start relay and compressor external protector. WARNING! To reduce the risk of electric shock, be sure to reconnect the compressor's ground wire. Cabinet After working with or around the cabinet thermistor, make sure the cabinet thermistor is in Thermistor...
- Page 36 V. Preparing the Appliance for Periods of Non-Use When shutting down the appliance for periods of non-use, follow the instructions below. WARNING Prevent 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.
- Page 37 VI. Disposal DANGER Risk of Fire or Explosion Flammable Refrigerant Used • Follow handling instructions carefully in compliance with U.S. government regulations. • Do not puncture refrigerant tubing. Risk of fire or explosion due to puncture of refrigerant tubing; follow handling instructions carefully. •...
- Page 38 VII. Technical Information A. Electrical and Refrigerant Data Design Pressure (PSIG) Refrigerant (oz.) AC Supply Model (includes drawer models) Voltage Amperes HIGH LOW R290 UR/WR27B(-xxx), UR27B-GLP01, SR27B-(xxxxx) 115/60/1 UF/WF27B(-xx), UF27B-GLP01 UR/WR36B(-xx) and SR36B(-xxx) 115/60/1 UR/WR48B(-xx), UR48B-GLP01, SR48B-(xxxxx) 115/60/1 UF/WF48B(-xx) and UF/WF60B(-xx) 115/60/1 UR/WR60B(-xx) 115/60/1...
- Page 39 B. Wiring Diagrams 1. UR/WR27, UR/WR36, UR/WR48 (except glass door), and SR36...
- Page 40 2. UF/WF27, SR27, and SR48...
- Page 41 3. UR/WR48 (glass door), UR/WR60, and UR/WR72...
- Page 42 4. UF/WF48, UF/WF60, SR60, and SR72...