Duke READYFLEX RFDU 23 User manual

P/N 229399
REV D 01/19/2022
MODELS
RFDU 23
U.S. and Foreign Patents Pending
This manual is Copyright © 2021 Duke Manufacturing Co. All rights reserved.
Reproduction without written permission is prohibited. Duke is a registered
trademark of the Duke Manufacturing Co.
CAUTION: Please read this manual completely before attempting
to install, operate or service this equipment
Installation and
Operation Manual
WARNING for CA residents: go to www.dukemfg.com/prop65 for prop 65 warning

RFDU Operator’s Manual
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TABLE OF CONTENTS
TO BE UPDATED
Manufacturer’s Introduction........................................................................................................................................3
Important Safety Instructions.................................................................................................................................. 4-5
Installation.......................................................................................................................................................................6
RFDU Operating Instructions.......................................................................................................................................8
Overview ............................................................................................................................................................................................. 8
Preheating .......................................................................................................................................................................................... 9
Faults..................................................................................................................................................................................................... 9
RFDU Daypart Menu ....................................................................................................................................................................... 9
Settings ..........................................................................................................................................................................10
Menu..................................................................................................................................................................................................10
Temp Mode.......................................................................................................................................................................................10
PHU Congurator...........................................................................................................................................................................10
RFDU Recipe Editor........................................................................................................................................................................11
Language ..........................................................................................................................................................................................11
Help.....................................................................................................................................................................................................11
About..................................................................................................................................................................................................12
Tools Menu........................................................................................................................................................................................12
Network .............................................................................................................................................................................................12
PHU Volume .....................................................................................................................................................................................15
Temperature Display .....................................................................................................................................................................15
Managers Menu..............................................................................................................................................................................15
Access.................................................................................................................................................................................................16
Temp Oset ......................................................................................................................................................................................16
IRDC Period.......................................................................................................................................................................................17
Sous Chel Technology Programming........................................................................................................................18
USB Programming........................................................................................................................................................19
Cleaning Guide .............................................................................................................................................................21
Temperature Check Procedure ..................................................................................................................................23
RFDU Specication.......................................................................................................................................................24
Wire Diagrams ..............................................................................................................................................................25

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RFDU Operator’s Manual
MANUFACTURER’S INTRODUCTION
The ReadyFlex™ Display Unit (RFDU) delivers unsurpassed culinary performance for a broad variety
of food products in a exible, easy to use, easy to learn, adaptable format thus addressing the
needs of the restaurant operations and protability.
The Duke ideal holding curve, the DNA of the RFDU, has been developed, improved, and rened
since Duke introduced the rst product holding unit in 1999. Utilizing the innovative top and
bottom heat, extended hold times with improved food quality and consistency are achieved.
With the ReadyFlex™ Display Unit, you can oer new menu items without limitation on how to
hold them; change your recipes and hold congurations by daypart; from breakfast to lunch to
dinner. Independent top and bottom heat zones are programmable to dial in perfect recipes for
any food….no compromises.
The ReadyFlex™ Display Unit can hold 6 full-size sheet pans.
The easy to use, easy to learn touchscreen user interface is visual, smart, intuitive and colorful. In-
store control and programming is easy and fast - change to stored library recipes or program new
ones on the y. Daypart switching is simple and pre-programmed.
ReadyFlex™ Technology is ready to connect when (and if) you are. RFDU has built-in Wi-Fi,
Ethernet, USB and Mesh networking and connectivity to Bluetooth enable devices. RFDU is ready
to interact with 3rd party cloud and on-premise solutions.

RFDU Operator’s Manual
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Throughout this manual, you will nd the following safety words and symbols that signify
important safety risks with regards to operating or maintaining the equipment.
Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION
Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
CAUTION
Indicates Important Information
Indicates electrical shock hazard which, if not avoided, could
result in death or serious injury and/or equipment damage.
Indicates hot surface which, if not avoided, could result in
minor or moderate injury.
In addition to the warnings and cautions in this manual, use the following guidelines for
safe operation of the unit.
• Read all instructions before using equipment.
• For your safety, the equipment is furnished with a properly grounded cord connector. Do
not attempt to remove or disconnect the grounded connector.
• Install or locate the equipment only for its intended use as described in this manual.
• Do not use corrosive chemicals on this equipment.
• Do not operate this equipment if it has a damaged cord or plug, if it is not working
properly, or if it has been damaged or dropped.
• This equipment should be serviced by qualied personnel only. Contact the nearest
Duke authorized service facility for adjustment or repair.
• Do not block or cover any openings on the unit.
• Do not immerse cord or plug in water.
• Keep cord away from heated surfaces.
• Do not allow cord to hang over edge of table or counter.
IMPORTANT SAFETY INSTRUCTIONS

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RFDU Operator’s Manual
IMPORTANT SAFETY INSTRUCTIONS
The following warnings and cautions appear throughout this manual and should be
carefully observed.
• Turn the unit o, disconnect the power source and allow unit to cool down before
performing any service or maintenance on the unit.
• The procedures in this manual may include the use of chemical products. You must read
the Material Safety Data Sheets before using any of these products.
• The unit should be grounded according to local electrical codes to prevent the
possibility of electrical shock. It requires a grounded receptacle with dedicated electrical
lines, protected by fuses or circuit breaker of the proper rating, in accordance with all
applicable regulations.
• Disposal of the unit must be in accordance with local environmental codes and/or any
other applicable codes.
• This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance
by a person responsible for their safety.
• Contains Transmitter Module FCC ID: 2AQ2Q-MUR1LVUFL
• Contains Transmitter Module IC: 27013-MUR1LVUFL
• This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may
cause undesired operation.
• This equipment complies with radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with a minimum
separation distance of 20cm between the radiator (enclosed antenna) and your body.
• This device is granted for use in Mobile only congurations in which the antennas used
for this transmitter must be installed to provide a separation distance of at least 20cm
from all person and not be co-located with any other transmitters except in accordance
with FCC and Industry Canada multi-transmitter product procedures.
• Changes or modications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.

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UNPACKING UNIT
Inspect the shipping carton and/or container, carefully noting any exterior damage on the delivery receipt;
also note any damage not evident on the outside of the shipping container (concealed damage). Contact
the carrier immediately and le a damage claim with them. Save all packing materials when ling a claim.
Freight damage claims are the responsibility of the purchaser and are not covered by the warranty.
• Follow the instructions on the Carton Box for unpacking the unit.
• Inspect unit for damage.
• Report any dents or breakage to source of purchase immediately.
• Do not attempt to use unit if damaged.
• Remove all materials from unit interior.
• If unit has been stored in extremely cold area, wait a few hours before connecting power.
INSTALLATION CODES AND STANDARDS
In the United States, the RFDU must be installed in accordance with the following:
1. State and local codes.
2. National Electrical Code (ANSI/NFPA No. 70, latest edition) available from the National Fire Protection
Association, Batterymarch Park, Quincy, MA 02269.
3. Vapor Removal from Cooking Equipment, (NFPA-96, latest edition) available from NFPA.
4. Sealed to the counter upon which the equipment is placed per NSF/ANSI 4 standard.
In Canada, the RFDU must be installed in accordance with the following:
1. Local codes.
2. Canadian Electrical Code (CSA C22.2 No. 3, latest edition) available from the Canadian Standards
Association, 5060 Spectrum Way, Mississauga, Ontario, Canada L4W 5N6.
UNIT PLACEMENT
• Do not install unit next to, below or above source of heat such as oven or deep fat fryer.
• Install unit on level counter top surface.
• Outlet should be located so that plug is accessible when the unit is in place.
• Do not install unit in the direct path of
air-conditioned airow.
INSTALLATION

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RFDU Operator’s Manual
The following minimum clearances must be maintained between the warmer and any combustible or non-
combustible substance:
Proper airow around unit will cool the electrical components. With restricted airow, the unit may not
operate properly and the life of the electrical components may be reduced. A 2”clearance is recommended
at the control side for longer control life expectancy.
ELECTRICAL SHOCK HAZARD UNIT MUST BE SAFETY GROUNDED, EARTHED.
DO NOT MODIFY, DEFEAT ELECTRICAL CONNECTIONS.
ELECTRICAL CONNECTIONS
BEFORE CONNECTING THE UNIT TO THE POWER SOURCE, VERIFY THAT THE
VOLTAGE AND PHASE OF THE POWER SOURCE ARE IDENTICAL TO THE VOLTAGE AND
PHASE INFORMATION ON THE DATA LABEL.
EARTHING INSTRUCTIONS
Connection of the unit to the mains supply MUST be performed by an authorized person in accordance
with codes, standards, and laws governing the installation site using properly rated all poles mains
protection, all poles mains disconnects, safety ground earthing, and shall be a minimum of 48” (1.2 meter)
long to allow the equipment to be moved for cleaning.
USA and non-EU Countries must use exible conduit within variances that may be required by local electric
codes or regulations. European Union (CE) installations must use HO7RN-F, 5G 2,5mm exible cordage.
The Mains Supply safety / earth ground wire must be longer than mains conductors at the unit’s
interconnections to prevent stress under pull. Contact Duke for service of IVS (Integrated Ventilation
System) HO5RN supply interconnection.
EXTERNAL EQUIPOTENTIAL
Terminal provides a connection for bonding to equipment enclosure.
Unit Clearance
Right Side 2”
Left Side 2”
Rear OPEN
Floor 0”
INSTALLATION

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RFDU OPERATING INSTRUCTIONS
When the ReadyFlex™ Display Unit is turned on the
boot screen will appear rst for 2 or 3 seconds. This
will display the Duke Logo along with the rmware
version number of the RFDU.
RUNTIME SCREEN
After the RFDU has loaded the runtime screen will
load. Dierent types of information are found on
the runtime screen. Details below.
When the unit rst boots each well will contain a
preheating icon. This indicates the well is heating
to temperature. When the recipe temperature is
reached the preheat icon will clear and the well will
be ready for use.
OVERVIEW
Recipe Name
Current Recipe
Top IR Duty Cycle
Bottom Heat
Setpoint
Menu Selector Setting Icon

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RFDU Operator’s Manual
PREHEATING
RFDU OPERATING INSTRUCTIONS  Continued
When the RFDU rst boots each well will contain a
preheating icon. This indicates the well is heating
to temperature. When the recipe temperature is
reached the preheat icon will clear and the well will
be ready for use.
FAULTS
On occasion faults may occur on the RFDU. If a fault
occurs an indicator will appear on the well.
1. Bottom Heater High Temperature Fault
2. Bottom Heater Low Temperature Fault
3. CAN Error Fault
Each fault will display an indicator that is unique for
the top of fault that has appeared.
To choose another menu, select the Menu
Selector. This will display the Menu screen.
Select another Menu number and then back to
the runtime screen.
1– Breakfast 2– Lunch 3– Dinner
RFDU DAYPART MENU
BOTTOM HEATER HIGHBOTTOM HEATER LOW
CAN ERROR

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SETTINGS
Several Settings are available on the RFDU. To enter the Settings menu click on the cog icon ( ) which is
found in the lower right hand corner of the runtime screen.
“Temp Mode” will display an option where the
temperature mode can be changed from the
default of Fahrenheit to Celsius.
NOTE: Any temperature throughout the control will
display in the selected temperature mode.
RFDU OPERATING INSTRUCTIONS  Continued
The “Menu”option is allows you to select the
number Menus (or dayparts) you want to be
available (1 to 3).
Menu
Temp Mode
PHUCongurator
When the user loads the “RFDU Cong” menu
option within Settings the following screen will
appear.
In the same way as the runtime screen the unit’s
conguration (for example 2X1) will be detected
and displayed.
The PHU cong option allows the recipe mapping
of each well to be modied for each menu.
When an individual well is pressed a list of available
recipes will appear available for selection within the
zone, for example: