Hoshizaki Steelheart Series Service Manual
Refrigerated kitchen equipment
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Summary of Contents for Hoshizaki Steelheart Series
- Page 1 Service Manual Steelheart Series Refrigerated Kitchen Equipment Models Refrigerated Prep Table with Raised Rail B Series hoshizakiamerica.com Number: 73246 Issued: 2-14-2023...
- 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 • Protect the floor when moving the appliance to prevent damage to the floor. • Keep ventilation openings clear of obstruction. The factory-installed rear bumpers must be in place to ensure proper rear clearance. Blockage of airflow could negatively affect performance and damage the appliance.
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Page 8: Construction And Refrigeration Circuit Diagram
I. Construction and Refrigeration Circuit Diagram A. Construction 1. Refrigerated Prep Table with Raised Rail Rail Cover Rail Control Rail Light Sensor Dial Evaporator PTC Relay and Run Capacitor Compressor Front Panel Condenser Condenser Cabinet Control Condenser Rail Control Module Air Filter Left Side Panel Fan Motor... -
Page 9: Refrigeration Circuit Diagram
B. Refrigeration Circuit Diagram Evaporator Fan(s) (quantity depends on model) Evaporator Defrost Safety Thermostat Capillary Tube Defrost Heater Defrost Thermistor Cabinet Fan(s) (quantity depends on model) Heat Exchanger Compressor Condenser Fan Drier Condenser... -
Page 10: Sequence Of Operation And Service Diagnosis
II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow Chart 1. Rail Sequence... - Page 11 2. Cabinet Sequence Cabinet Sequence Flow Chart Cabinet Fan Motor(s) relay energized through rail control module 1. Startup/Cool Down 2. Cool Down Achieved 3. Cool Down Restart Cycle Steps CTh warms to 1.8°F (1°C) above setpoint and CTh cools to RCM not in defrost 1.8°F (1°C) CTh above setpoint...
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Page 12: 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 13 WARNING • The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Wear appropriate personal protective equipment (PPE) when servicing the appliance. • Risk of electric shock. Use extreme caution and exercise safe electrical practices. •...
- Page 14 Factory Default Temperature Settings: a) Rail Control Dial: 5 Day Mode - Rail Cover(s) Open (27°F (-2.8°C)) Night Mode - Rail Cover(s) Closed (35°F (1.7°C)) b) Cabinet Control Module: 35°F (1.7°C) c) Display Scale: °F Note: There is a minimum 2-min. Comp on time and 2-min. Comp off time. For further details, see "III.
- Page 15 d1) Service Diagnosis: Cabinet Control Module: 4A7178-01 PR46B: L-5 to M50052H, M50073K and Later; (-D2): ALL PR60B: L-5 to M50007H, M50025L and Later; (-D4): ALL PR67B(-D2)(-D4): ALL PR93B(-D2)(-D4)(-D6): ALL CCM, CTh, CabFMR, and CabFM Diagnosis: CCM and CTh Diagnosis: Cabinet temperature appears on display and when cabinet temperature is above setpoint, cooling icon ( ) is displayed.
- Page 16 CabFMR and CabFM Diagnosis: With CCM cooling icon displayed ( ) (represents CTh call for cooling) and CabFMR energized, CabFM(s) energize. If not, check for 115VAC at CCM 1(DO1) yellow (Y) wire and 3(N) neutral white (W) wire. If 115VAC is not present, replace CCM.
- Page 17 1b) Manual-Initiation: To initiate or terminate a manual defrost cycle: Turn the rail control dial clockwise to put the rail control dial 9 setting in the 12 o'clock position, pause for 3 to 5 sec., then turn the rail control dial counterclockwise to any position below setting 7 in the 12 o'clock position.
- Page 18 2) Termination Diagnosis: There is a 5 min. minimum defrost time and a 1 hr. maximum defrost time. Has 5-min. minimum defrost timer terminated? Confirm DTh status. See "II.C. Thermistor Check." (1) RCM, DTh, and DH Diagnosis: If 5-min. minimum defrost timer has terminated, has DTh warmed to 41°F (5°C)? If not, check DST and DH continuity.
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Page 19: Thermistor Check
C. Thermistor Check This appliance utilizes 3 thermistors: Rail thermistor, cabinet thermistor, and defrost thermistor. The rail thermistor is used for rail temperature control, the cabinet thermistor is used for cabinet temperature control and the defrost thermistor is used for defrost termination (41°F (5°C)). -
Page 20: Diagnostic Table
D. Diagnostic Table Check for correct appliance installation per the instruction manual and proper voltage per appliance nameplate. 1a. Appliance Not Cooling - Rail Area Appliance Not Cooling - Rail Area - Possible Cause Power Supply a) Unplugged, blown fuse, or tripped or defective circuit breaker. b) Loose connection. - Page 21 1b. Appliance Not Cooling - Cabinet Area Appliance Not Cooling - Cabinet Area - Possible Cause Power Supply a) Unplugged, blown fuse, or tripped or defective circuit breaker. b) Loose connection. c) Not within specifications. Power Cord and Plug a) Loose connection. b) Defective.
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Page 22: Controls And Adjustments
III. Controls and Adjustments This appliance utilizes a rail control module, rail control dial, rail light sensor, and a cabinet control module. See Fig. 2. Rail Light Sensor Cabinet Control Module Rail Control Dial Rail Control Module Fig. 2... -
Page 23: Control Modules
A. Control Modules When the power cord is plugged in there is a slight delay, then the current cabinet temperature is displayed on the cabinet control module. From the cabinet control module, the cabinet setpoint and temperature display scale can be changed. All models are pretested and factory set NOTICE •... - Page 24 2a. Cabinet Control Module Display Icons: 4A7178-01 PR46B: L-5 to M50052H, M50073K and Later; (-D2): ALL PR60B: L-5 to M50007H, M50025L and Later; (-D4): ALL PR67B(-D2)(-D4): ALL PR93B(-D2)(-D4)(-D6): ALL Cabinet Control Module Icons Icon Meaning Cooling Icon used for Cabinet Fan Motor operation Cabinet thermistor calling for cooling.
- Page 25 2b. Cabinet Control Module Display Icons: 4A7053-01 PR46B: M50053H-M50072H PR60B: M50008H-M50024H Cabinet Control Module Icons Icon Meaning Cooling Icon used for Cabinet Fan Motor operation Cabinet thermistor calling for cooling. Cabinet fan motor energized if compressor is energized. Alarm for Cabinet Appliance is in alarm.
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Page 26: Temperature
B. Temperature The default temperature scale is °F, but it can be changed to read °C. To change, see "III.B.3. Changing the Temperature Display Scale (°F or °C)." 1. Default Temperature Settings a) Rail Area Day Mode (Rail Cover Open) - Rail Control Dial Setpoint: 5 (27°F (-2.8°C)). b) Rail Area Night Mode (Rail Cover Closed) - Rail Control Dial Setpoint: 35°F (1.7°C) c) Cabinet Control Module Setpoint: 35°F (1.7°C). -
Page 27: 4A. Cabinet Temperature Control - Cabinet Control Module 4A7178-01
a) Rail Control Dial Adjustment. To adjust day mode temperature setpoint, rotate the control knob counterclockwise for a warmer setting and clockwise for a colder setting. See Fig. 8. 1 is the warmest setting and 9 is the coldest setting. For "OFF" position, rotate to 0 setting. - Page 28 b) Cabinet Temperature Display Scale ( F or ° ° There are 4 temperature display settings from which to choose. The factory temperature display default is F0 for °F whole number. For a whole number temperature display scale value, select F0 or C0. For a temperature display scale value to one decimal point, select F1 or C1.
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Page 29: 4B. Cabinet Temperature Control - Cabinet Control Module 4A7053-01
4b. Cabinet Temperature Control - Cabinet Control Module 4A7053-01 PR46B: M50053H-M50072H PR60B: M50008H-M50024H The cabinet temperature is controlled by the cabinet control module in conjunction with the cabinet thermistor and cabinet fan motor relay. The cabinet control module energizes the cabinet fan motors when needed, if cabinet fan motor relay is energized. The cabinet control module does not energize or de-energize the compressor. - Page 30 c) Cabinet Temperature Display Scale Value (35 F/C or 35.0°F/C): ° To change the temperature display scale value from a whole number to one decimal point, follow the steps below. 1) Press and hold both the up and down buttons for 5 seconds,"EHE" is displayed. 2) Press the up or down arrow button until "diS"...
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Page 31: Manual Defrost
C. Manual Defrost The cabinet control module does not have the function enabled for manual defrost. The rail control dial is used for this function. To manually initiate or terminate a defrost cycle: Turn the rail control dial clockwise to put the control dial 9 setting in the 12 o'clock position, pause for 3 to 5 sec., then turn the rail control dial counterclockwise to any position below setting 7 in the 12 o'clock position. -
Page 32: 1B. Cabinet Control Module: 4A7053-01
1b. Cabinet Control Module: 4A7053-01 PR46B: M50053H-M50072H PR60B: M50008H-M50024H Alarm Signals Alarm Code Problem Corrective Action/Reset Details Cabinet Thermistor Malfunction Alarm Check Cabinet Thermistor. "E01" flashes. Alarm icon flashes. Cabinet thermistor has failed. Cabinet Fan(s) cycle 5 min. on, 5 min. off. E01 - Cabinet thermistor out of place, open or shorted. -
Page 33: 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 34 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 35: 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 (190 PSIG). -
Page 36: Brazing
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 37 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 required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets the requirements of ARI Standard 700 (latest edition) be used.
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Page 38: 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 Compressor included in condensing unit: PR46B(-D2) and PR60B(-D4): 3B0964-01 PR67B(-D2)(-D4) and PR93B(-D2)(-D4)(-D6): 3B0992-01. Prior to replacing condensing unit, confirm that the PTC relay and external protector are good. -
Page 39: Maintenance
3. Power Supply Connection If the plug or power cord is damaged, contact your local Hoshizaki service representative or local Hoshizaki distributor immediately and ask for repairs. All other maintenance or service on this appliance should be performed in accordance... -
Page 40: Preparing The Appliance For Periods Of Non-Use
VI. Preparing the Appliance for Periods of Non-Use When shutting down the appliance for more than one week, follow the instructions below. WARNING When preparing the appliance for long storage, prevent the doors/drawers from closing to reduce the risk of children getting trapped. NOTICE When preparing the appliance for long storage, clean the appliance. -
Page 41: Disposal
VII. 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 42: Technical Information
VIII. Technical Information A. Electrical and Refrigerant Data Design Pressure Refrigerant (PSIG) (oz.) AC Supply Model Voltage Amperes HIGH LOW R-290 PR46B(-D2) 115/60/1 PR60B(-D4) 115/60/1 PR67B(-D2)(-D4) 115/60/1 PR93B(-D2)(-D4)(-D6) 115/60/1 See the nameplate for electrical and refrigeration specifications. The nameplate is located inside the cabinet. -
Page 43: Wiring Diagrams
B. Wiring Diagrams 1a. Cabinet Fan Motor Control Module: 4A7178-01 PR46B: L50001G-M50052H, M50073H and later; (-D2): ALL PR60B: L50001G-M50007F, M50008H and later; (-D4): ALL PR67B(-D2)(-D4): ALL PR93B(-D2)(-D4)(-D6): ALL... - Page 44 1b. Cabinet Fan Motor Control Module: 4A7053-01 PR46B: M50053H-M50072H PR60B: M50008H-M50024...