Duke EHU-4 Installation And Operation Manual
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Duke EHU-4 Installation And Operation Manual

Extended holding unit
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EXTENDED HOLDING UNIT
Model:
EHU-4
CAUTION:
WARNING for CA residents: go to www.dukemfg.com/prop65 for prop 65 warning
Please read this manual completely before attempting
to install, operate or service this equipment
This manual is Copyright © 2023 Duke Manufacturing Co. All rights reserved.
Reproduction without written permission is prohibited. Duke is a registered
trademark of the Duke Manufacturing Co.
Installation and
Operation Manual
PN 229357
REV B 12/5/2023

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Summary of Contents for Duke EHU-4

  • Page 1 WARNING for CA residents: go to www.dukemfg.com/prop65 for prop 65 warning This manual is Copyright © 2023 Duke Manufacturing Co. All rights reserved. Reproduction without written permission is prohibited. Duke is a registered PN 229357 trademark of the Duke Manufacturing Co.

  • Page 2: Table Of Contents

    Owner's Manual for EHU-4 Holding Unit TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS ..................SPECIFICATIONS ..........................MAIN FEATURES ..........................INSTALLATION ........................... OPERATING INSTRUCTIONS ......................ERROR FAULT MESSAGING ......................12 PROGRAMMING CONTROLS ......................17 CARE AND CLEANING ........................21 RH SENSOR PREVENTIVE MAINTENANCE ................22 DOOR ADJUSTMENTS AND GASKET MAINTENANCE .............
  • Page 3 Owner's Manual for EHU-4 Holding Unit IMPORTANT SAFETY INSTRUCTIONS ELECTRICAL WARNINGS THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL ELECTRICAL EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD STARTUP AND ADJUSTMENTS OF THE EQUIPMENT COVERED BY THIS MANUAL. READ THIS MANUAL THOROUGHLY BEFORE OPERATING, INSTALLING OR PERFORMING MAINTENANCE ON THE EQUIPMENT.
  • Page 4 Do not use corrosive chemicals, water jet equipment, or other pressurized liquid spraying equipment to clean this unit. • This equipment should be serviced by qualified personnel only. Contact the nearest Duke authorized service facility for adjustment or repair. •...
  • Page 5 Owner's Manual for EHU-4 Holding Unit IMPORTANT SAFETY INSTRUCTIONS involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision. • Turn off external mains supply disconnect and allow unit to cool down before servicing or performing maintenance.

  • Page 6: Specifications

    Owner's Manual for EHU-4 Holding Unit SPECIFICATIONS 2.69 2.64 35.70 31.33 24.50 38.50 34.34 Overall Overall Overall Crated Electrical Depth Height Width Weight in/cm in/cm in/cm lbs/kg Amps Voltage/ Watts 35.70/90.68 38.50/97.79 24.50/62.23 335/152 3200 3200 Patent Pending - Model EHU-4...

  • Page 7: Main Features

    Owner's Manual for EHU-4 Holding Unit MAIN FEATURES FRONT VIEW Main Switch Power Cord Touch Screen Control Panel USB Port BACK VIEW Active Vent Removable Racks for Pans Spillage Pan High Limit Protector...

  • Page 8: Installation

    Owner's Manual for EHU-4 Holding Unit INSTALLATION UNPACKING UNIT UNIT PLACEMENT Inspect the shipping carton and/or container, • Do not install unit next to source of heat, such carefully noting any exterior damage on the as deep fryer, etc. delivery receipt; also note any damage not •...
  • Page 9 Owner's Manual for EHU-4 Holding Unit INSTALLATION THE MAIN SWITCH ON THE APPLIANCE IS FOR STANDBY POWER ONLY. DO NOT USE AN EXTENSION CORD. If the product FOR ALL-POLE DISCONNECT REMOVE PLUG power cord is too short, have a qualified electrician FROM WALL OUTLET.

  • Page 10: Operating Instructions

    Owner's Manual for EHU-4 Holding Unit OPERATING INSTRUCTIONS Preheat Screen Menu Selector Settings Icon Recipe Names / Trays Preheat Icon Run Screen AUDIBLE ALARMS The EHU has various audible alarms. 1 chirp Keystroke acknowledgement 3 short chirps EHU up to temperature notification 3 beeps (Continuous every 2 min.
  • Page 11 ON position. The boot screen will appear first for 2 or 3 seconds. This will display the Duke Logo along with the firmware version number of the EHU. NOTE: The unit will not attempt to vent the cabinet until preheat is complete.

  • Page 12: Error Fault Messaging

    Owner's Manual for EHU-4 Holding Unit OPERATING INSTRUCTIONS 7. When a timer is started the color of the timer will change to green, use this product first. When a second timer of the same recipe is started, this timer will change to grey (alternate color mode = amber), use this next.
  • Page 13 Owner's Manual for EHU-4 Holding Unit ERROR FAULT MESSAGING DESCRIPTION Some Error Fault Message Categories will have one or more Error Fault Message Actions. These will be An example of a Low Temperature Fault is shown displayed in sequential order, of the most common below with the fault icon in the upper left hand cause and corrective action.
  • Page 14 Owner's Manual for EHU-4 Holding Unit ERROR FAULT MESSAGING HIGH HUMIDITY LOW TEMPERATURE First Warning First Warning • Possible cause, adding product or recipe • Check doors, if open, close doors. change • Wait for possible recover • Wait for possible recovery...
  • Page 15 Owner's Manual for EHU-4 Holding Unit ERROR FAULT MESSAGING Third Warning HIGH TEMPERATURE • Check the Over Temperature Safety Limit First Warning Switch. Push button to reset if tripped. • Possible cause, adding product or recipe • If condition persists, call Duke Service.
  • Page 16 Owner's Manual for EHU-4 Holding Unit ERROR FAULT MESSAGING CRITICAL SENSOR FAULTS RH PROBE FAULT - Humidity Sensor Fault • Remove Product and Call for Service CAN LOSS FAULT - CAN Connection Lost • Remove Product and Call for Service CAVITY RTD FAULT - Main Heater Sensor Fault •...

  • Page 17: Programming Controls

    Owner's Manual for EHU-4 Holding Unit PROGRAMMING CONTROLS • HELP - Displays a QR code for a link to the To access the SPECIAL FUNCTIONS, touch Installation and Operation Manual. settings button on the runtime screen. • CONTACT US – Displays regional contact information.
  • Page 18 Owner's Manual for EHU-4 Holding Unit PROGRAMMING CONTROLS • SYSTEM STATUS – Displays ‘real time’ unit • 4 TRAY MODE – Toggles on / off 4 Tray Mode. status 4 Tray Mode enabled will display a 4 tray unit configuration on the U/I. 4 Tray Mode disabled will display a 5 tray unit configuration.
  • Page 19 Owner's Manual for EHU-4 Holding Unit PROGRAMMING CONTROLS RECIPE (RECIPE EDIT) • RECIPES – Allows you to edit a recipe name and hold time. To edit the name, select the recipe 1. Touch the button and then enter pin code...
  • Page 20 Owner's Manual for EHU-4 Holding Unit PROGRAMMING CONTROLS • RECIPE EXPORT – Allows you to export the • RECIPE IMPORT - Allows you to import the recipe and tray configuration on the unit to a recipe and tray configuration on a USB stick USB stick.

  • Page 21: Care And Cleaning

    Owner's Manual for EHU-4 Holding Unit CARE AND CLEANING THE MAIN SWITCH ON THE APPLIANCE IS FOR STANDBY POWER ONLY. FOR ALL-POLE DISCONNECT REMOVE PLUG FROM WALL OUTLET. INTERIOR, RACKS AND ELEMENTS ARE VERY HOT AND COOL SLOWLY. ALLOW TO COOL BEFORE HANDLING.

  • Page 22: Rh Sensor Preventive Maintenance

    Owner's Manual for EHU-4 Holding Unit CARE AND CLEANING TAKE CARE NOT TO DAMAGE THE THE LOWER HEATER AND AIRFLOW SYSTEM ALUMINUM FAN BLADE WHEN CLEANING AREA WILL BE HOT WELL AFTER THE THE LOWER HEATER AND AIRFLOW SYSTEM INTERIOR SURFACES HAVE COOLED TO ROOM TEMPERATURE.

  • Page 23: Door Adjustments And Gasket Maintenance

    Owner's Manual for EHU-4 Holding Unit DOOR ADJUSTMENTS AND GASKET MAINTENANCE DOOR AND GASKET INSPECTION 2. With the door closed, remove the hinge covers with a screwdriver and loosen the 2 screws per 1. Inspect door gaskets for cuts, tears or any other hinge that hold the hinge body to the door.
  • Page 24 Owner's Manual for EHU-4 Holding Unit DOOR ADJUSTMENTS AND GASKET MAINTENANCE REVERSING UNIT DOOR SWING DIRECTION 3. Reassemble the door as follows: a. Reinstall the hinges and door latch handle 1. Open the door approximately 135 degrees. Lift with the screws matched with the associated the door off of the hinge.
  • Page 25 Owner's Manual for EHU-4 Holding Unit DOOR ADJUSTMENTS AND GASKET MAINTENANCE 5. The door hinges have cams so they are self 6. Holding the door in a position approximately closing. Being careful to not damage or 135 degrees open, carefully reassemble the score the plastic cams, using either a small door to the cabinet hinges.

  • Page 26: Troubleshooting

    Owner's Manual for EHU-4 Holding Unit TROUBLESHOOTING Problem Possible Cause Solution Unit is not ON Unit is not connected to power Connect power cord to the electrical power source Main Switch is not ON Turn switch ON Supply Circuit Breaker is tripped...
  • Page 27 Owner's Manual for EHU-4 Holding Unit TROUBLESHOOTING A Manually reset high temperature safety limit is provided on the lower right back of the unit to protect the main elements. The high limit will not trip under normal operating conditions. Should the high limit trip, push the RESET button.

  • Page 28: Wiring Diagram

    Owner's Manual for EHU-4 Holding Unit WIRING DIAGRAM COIL COIL Duke Manufacturing Co. Phone: 314-231-1130 Toll Free: 1-800-735-3853 2305 N. Broadway www.dukemfg.com Fax: 314-231-5074 St. Louis, MO 63102...

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