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Summary of Contents for Hoshizaki SR48B-18M
- Page 1 Service Manual Steelheart Series Refrigerated Kitchen Equipment Models Undercounter Worktop Prep Table Number: 73217 Issued: 11-2-2018 hoshizakiamerica.com Revision: 6-14-2021...
- 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;...
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Page 3: Table Of Contents
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
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 Prep Table appliance to prevent damage to the floor. Models • Keep ventilation openings, in the • The entire rail must always be covered appliance enclosure or in the built-in by rail dividers and pans (1/6 size, up structure, clear of obstruction.
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Page 8: Construction And Refrigeration Circuit Diagram
I. Construction and Refrigeration Circuit Diagram A. Construction Solid Door Models • Evaporator • Evaporator Fan • Evaporator Fan Shroud Nameplate Thermometer Door Cabinet Temperature Control Dial Door Gasket Model Shown: UF60A Control Condenser Module Condenser Fan Motor Rear Panel Compressor Model Shown: UF60A... - Page 9 Glass Door Models • Evaporator • Evaporator Fan • Evaporator Fan Shroud Nameplate Thermometer Door LED Lights Cabinet Temperature Control Dial Door Gasket Model Shown: UR48A-GLP01 LED Driver Channel Control Condenser Module Compressor Condenser Fan Motor Rear Panel Model Shown: UR48A-GLP01...
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Page 10: Refrigeration Circuit Diagram
B. Refrigeration Circuit Diagram Condenser Condenser Fan Drier High-Pressure Switch Capillary Tube Compressor Evaporator Fans Cabinet Thermistor (1, 2, or 3 depending on model) Evaporator Prep Table and Freezer Models: Defrost Safety Thermostat Prep Table and Freezer Models: Defrost Thermistor Prep Table and Freezer Models: Defrost Heater... -
Page 11: Sequence Of Operation And Service Diagnosis
II. Sequence of Operation and Service Diagnosis The steps in the sequence are as outlined below. A. Sequence of Operation Flow Chart 1. Undercounter and Work Top: Refrigerator... -
Page 12: Prep Table: Refrigerator
2. Prep Table: Refrigerator... -
Page 13: Undercounter And Work Top: Freezer
3. Undercounter and Work Top: Freezer... -
Page 14: Service Diagnosis
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: Refrigerator/Freezer/Prep Table
1. Refrigerator/Freezer/Prep Table 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 b) CTCD Diagnosis: Confirm CTCD is set between 4 and 5. Check Ohm reading of CTCD. See "II.E) Cabinet Temperature Control Dial (CTCD)." c) CM Diagnosis: Confirm green LED is flashing. If not, check for 115VAC between CM 2 (L) black (BK) wire and CM 3 (N) neutral white (W) wire. If 115VAC is not present, check power cord connections and breaker/fuse.
- Page 17 5) Cool Down Achieved–Temperature cools to setpoint. Comp and ConFM de-energize. UC/WT Refrigerators and Freezers: EvapFM de-energizes. Prep Table: EvapFM continues. Diagnosis: If temperature setpoint achieved and Comp, ConFM, and EvapFM (except PT models) does not de-energize, check CTh and CTCD continuity. See "II.D.
- Page 18 2b) Temperature or Time-Terminated: CTh (Refrigerator) or DTh (PT and Freezers) achieves termination temperature or backup DT terminates. (1) Refrigerator: 43 F (6.1 C) achieved or 20-min. backup DT terminates. If CTh ° ° calling for cooling, Comp and CondFM energize. EvapFM continues. (2) Prep Tables: 46 F (7.7 C) achieved or 45-min.
- Page 19 3) Defrost Diagnosis: Initiation: Confirm Comp is energized, then manually initiate defrost. Rotate CTCD all the way to the right. Wait 1 to 5 sec. then rotate back to original setting. Defrost initiated. a) UC/WT Refrigerator: Check that Comp and ConFM de-energize. EvapFM continues.
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Page 20: Control Module Check
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 (W) to establish a good power supply and neutral connection to CM: 115VAC at CM 2 (L) (BK) 2. - Page 21 4. Defrost Termination 8) Check that all components restart after defrost termination. a) UC/WT Refrigerator: CTh warms to 43°F (6.1°C). Confirm continuity of CTh. See "II.D. Thermistor Check." Replace as needed. If CTh confirmed, replace CM. b) Prep Table: DTh warms to 46°F (7.7°C). DH de-energizes. Confirm continuity of DTh. See "II.D.
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Page 22: Thermistor Check
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, defrost cycle termination, and evaporator fan motor control. • Prep Table: Defrost initiation is below 50°F (10°C). Defrost termination is 46°F (6.6°C). -
Page 23: Cabinet Temperature Control Dial (Ctcd)
E. Cabinet Temperature Control Dial (CTCD) The cabinet temperature control dial (CTCD) works in conjunction with the cabinet thermistor to control cabinet temperature. The warmest setting is 1 and the coldest setting is 7. The default CTCD setting is between 4 and 5. CTCD resistance varies depending on temperature. - Page 24 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 open. Faulty. Cabinet Thermistor Loose, disconnected, or defective.
- Page 25 2. Evaporator is Frozen Up Evaporator is Frozen Up - Possible Cause Evaporator Dirty. Evaporator Fan Motor Defective. Fan blade binding. Refrigerant Charge Low. Defrost Heater (if applicable) Defective. Control Module Defective. Defrost Safety Thermostat Open Defective. (if applicable) 3. Defrost Refrigerator Defrost Fails to Initiate - Possible Cause 1.
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Page 26: Controls And Adjustments
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 7. - Page 27 2. Prep Table and Freezer Time/Temperature-Initiated Defrost Cycle: Defrost cycle occurs once every 6 hrs. for prep tables or 8 hrs. for freezers when defrost initiation temperature achieved (50 F (10 C) for ° ° Prep Tables or 41 F (5 C) for the Freezers).
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Page 28: Safety Devices
2. High-Pressure Switch If pressure on the high-side of the appliance exceeds Hoshizaki specifications, the high-pressure switch activates and interrupts the compressor circuit, de-energizing the compressor until the pressure returns to an acceptable level. -
Page 29: Refrigeration Circuit And Component Service Information
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 30 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. •...
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Page 31: Refrigeration Circuit Service Information
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 32 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 33 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.
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Page 34: Component Service Information
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. Defrost After working with or around the defrost thermistor on a freezer, make sure the defrost Thermistor... -
Page 35: Preparing The Appliance For Periods Of Non-Use
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 36: Disposal
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 37: Technical Information
VII. Technical Information A. Electrical and Refrigerant Data Design Pressure (PSIG) Refrigerant (oz.) AC Supply Model (includes drawer models) Voltage Amperes HIGH LOW R290 U/WR27A(-xxx) 115/60/1 UR27A-GLP01 U/WF27A(-xx) UF27A-LP 115/60/1 UF27A-GLP01 SR27A-(xxxxx) 115/60/1 U/WR36A(-xx) 115/60/1 SR36A(-xxx) 115/60/1 U/WR48A(-01) 115/60/1 U/WR48A-D2(-D4) UR48A-GLP01 115/60/1 U/WF48A(-xx) -
Page 38: Wiring Diagrams
B. Wiring Diagrams 1. Undercounter and Worktop: Refrigerator... -
Page 39: Prep Table
2. Prep Table... -
Page 40: Undercounter And Work Top: Freezer
3. Undercounter and Work Top: Freezer...
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