Duke RFHU-23R 2.5 Inch Deep Hot Holding Cabinet User Manual

: June 9, 2024
: Duke

Duke RFHU-23R 2.5 Inch Deep Hot Holding Cabinet

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MANUFACTURER’S INTRODUCTION
The ReadyFlex™ Holding Unit (RFHU) delivers unsurpassed culinary performance for a broad variety of food products in a flexible, easy to use, easy to learn, adaptable format thus addressing the needs of the restaurant operations and profitability.
The Duke ideal holding curve, the DNA of the RFHU, has been developed, improved, and refined since Duke introduced the first product holding unit in 1999. Utilizing the innovative top and bottom patented Duke technology HeatSinksTM, extended hold times with improved food quality and consistency are achieved.
With the ReadyFlex™ holding unit, you can offer new menu items without limitation on how to hold them; change your recipes and hold configurations. Independent top and bottom heat zones are programmable to dial in perfect recipes for any food….no compromises.
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 or program new recipes on the fly.

IMPORTANT SAFETY INSTRUCTIONS

Throughout this manual, you will find 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.
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
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 qualified 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.

The following warnings and cautions appear throughout this manual and should be carefully observed.

Turn the unit off, 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: 2AC7Z-ESP32WROVERB
Contains Transmitter Module IC: 21098-ESPWROVERB
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference, and
- 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 configurations 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 modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

INSTALLATION

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 file a damage claim with them. Save all packing materials when filing 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 RFHU must be installed in accordance with the following:

State and local codes.
National Electrical Code (ANSI/NFPA No. 70, latest edition) available from the National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
Vapor Removal from Cooking Equipment, (NFPA-96, latest edition) available from NFPA.
Sealed to the counter upon which the equipment is placed per NSF/ANSI 4 standard.

In Canada, the RFHU must be installed in accordance with the following:

Local codes.
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 airflow.

The following minimum clearances must be maintained between the warmer and any combustible or non-combustible substance:

Unit	Clearance
Right Side	2”
Left Side	2”
Rear	OPEN
Floor	0”

Proper airflow around unit will cool the electrical components. With restricted airflow, 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.

WARNING
ELECTRICAL SHOCK HAZARD UNIT MUST BE SAFETY GROUNDED, EARTHED. DO NOT MODIFY, DEFEAT ELECTRICAL CONNECTIONS OR ALTER PLUG.

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
THE UNIT MUST BE GROUNDED. Grounding reduces risk of electric shock by providing an escape wire for the electric current if an electrical short occurs. This unit is equipped with a cord having a grounding wire with a grounding plug. The plug must be plugged into a receptacle that is properly installed and grounded.
Consult a qualified electrician or service agent if grounding instructions are not completely understood, or if doubt exists as to whether the unit is properly grounded.
DO NOT USE AN EXTENSION CORD. If the product power cord is too short, have a qualified electrician install a three-slot receptacle (or the country specific receptacle for International Units). This unit should be plugged into a dedicated circuit with the electrical rating as provided on the product data plate.

STACKING UNITS

The RFHU is designed to allow limited stacking capabilities. This section outlines how to safely stack the holding unit.

Step 1 Remove the base pan from the unit that will be on top. The pan is held in place by four screws on the bottom of the unit.
Step 2 Place bottom unit into position then stack the next unit on top. The top of the lower holding unit rests inside of the base of the upper unit.

TIP HAZARD! DO NOT STACK RFHU-42 OR RFHU-34 UNITS. DO NOT EXCEED 2 HOLDING UNITS PER STACK. DO NOT PLACE HOLDING UNIT STACKS ON SURFACES THAT MAY EASILY TIP OVER.

RFHU OPERATING INSTRUCTIONS – SHELF CONTROL

OVERVIEW
When the unit is first powered the boot screen will appear for 2 to 3 seconds. This will display the Duke Logo along with the firmware version number.

After the control has booted the runtime screen will load.

Different information is found on the runtime screen of the control. Details below.

When the unit first boots the status will indicate “preheating”. When the setpoint temperature is reached this will change to a “ready” status. This indicates that the required preset temperature has now been reached by the unit. Both the preset temperature and the actual temperature are displayed on the runtime screen.

The control will contain 2 two different holding zones – each with two temperature sensors. When the navigation buttons are pressed – either left or right the temperature zone will change. There will be 4 in total. For example pressing▶ will move to the next zone as seen in the below.

The zone has changed from the “TOP” of “Shelf1” to the “BOTTOM” of “Shelf1”. When navigating to a different zone the actual temperature, preset temperature and status indicator will change to reflect the different temperatures (actual and preset) and status for the selected zone.

Instead of using navigation buttons the “grid ” option in the lower right-hand corner of the screen can be used to see all zones with their preset temperature. For example when the “grid icon” is pressed the following will appear.

When a zone is selected the screen will change to the selected zone without the need for the left and right navigation buttons.
The control has a number of configuration icons. Selecting the “COG” icon in the top right-hand corner will load the Settings menu.

SETTINGS

A number of settings are available on the control to allow customization of labels and preset values. These settings are:

PRESET EDITING

Selecting “Presets” will load the Preset editor.

The preset value for each zone can be modified by selecting the and buttons. The temperature will be able to be modified from a minimum of 140F to a maximum of 280F. Select to save the changes. The navigation buttons◀ and▶ can be used to navigate each of the four zones.

LABEL EDITING

Selecting the “Label Editor” within the Settings menu will allow the Label 1 and Label 2 for each Zone to be modified which. These labels are displayed on the runtime screen.
After selecting the “Label Editor” the following screen will appear.

Select the ‘edit’ ICON for Zone you wish to modify. For example, selecting “Zone 1” the following screen will be displayed.

Select a Label to modify. For example, select Label 1 to modify Shelf1 and the following screen will be displayed.

Each Zone label (Label 1 and Label 2) consists of six characters that can be upper case letters, lower case letters or numbers. Selecting will save the entry. Both labels can be modified. In the below example, Label 2 has been changed from Top to LEFT. When modified the runtime screen and grid display will both be updated with the new labels. For example:

LANGUAGE

This is reserved for future use and will allow users to change the language display on all screens.

The user can also be “locked” from editing the unit’s preset value if desired. This can be achieved by entering the “Settings menu” followed by the “Tools” menu.
The following menu options appear under the “Tools” menu.

The tools menu will also contain the “TEMP” option which allows the user to switch between Celsius and Fahrenheit display.
The default is Fahrenheit (F).
When modified all temperatures that appear on the runtime screen (actual and preset), grid display or the preset editor will be displayed is the selected temperature mode.
To lock or unlock the modification of the preset value, first enter the admin menu by selecting the
“Admin” and entering the “0654” pin code when prompted..

Follow this by selecting the “Access” option and then use the slider to either lock or unlock the preset editing –

The temperature calibration option is also accessible from the “Admin” menu to edit the offset value for each zone on the unit. When this menu option is selected the current grid display will be displayed with each of the individual temperature zones. Select a zone to edit the temperature calibration offset for the selected zone.

The temperature offset can be modified. The user will be allowed to edit the temperature calibration offset value from -20 F to 20F.

Use the and to increase or decrease the temperature calibration offset value.
When done select✅ to save the offset value else select❌ the button to exit without saving.

HELP
The Help option is reserved for future use.

REGISTER EQUIPMENT

The Register Equipment option is reserved for future use.

FAULTS

On occasion faults may be detected and displayed such as; SENSOR FAULT, LOW TEMP FAULT and HIGH TEMP FAULT. When a fault occurs, the specific fault will be displayed on the runtime screen. For exam-ple, in the below a “LOW TEMP FAULT” has occurred in the “Shelf 1 Top” temperature zone.
A fault indicatoralso exists on top of the “grid” icon in the lower right hand corner. See below.

The below runtime screen displays a sensor fault on “Shelf 1 Top”.

The below runtime screen displays a High Temperature fault on “Shelf 1 Top”.

When a fault occurs in a different temperature zone but not on the active zone that is currently displayed the icon will again be displayed on the grid icon in the lower right hand corner even if the current temperature zone does not have a fault.

When clicking on the grid icon the display of all temperature zones with their setpoint temperature will be displayed. Any zone that that contains a fault will have an error icon displayed.

CLEANING GUIDE

Electrical shock hazard. Do not wash with water jet or hose.
DO NOT USE CAUSTIC CLEANERS, ACIDS, AMMONIA PRODUCTS OR ABRASIVE CLEANERS OR ABRASIVE CLOTHS. THESE CAN DAMAGE THE STAINLESS STEEL AND PLASTIC SURFACES.
Bottom and sides of warmer wells are very hot and cool slowly.

DAILY CLEANING

Stainless Steel Surfaces
To prevent discoloration or rust on stainless steel several important steps need to be taken. Stainless steel contains 70-80% iron which will rust. It
also contains 12-30% chromium which forms an invisible passive ﬁlm over the steel surface which acts as a shield against corrosion. As long as the protective layer is intact, the metal will not corrode. If the ﬁlm is broken or contaminated, outside elements can begin to breakdown the steel and begin to form rust or discoloration.
Proper cleaning of stainless steel requires soft cloths or plastic scouring pads.

Never use steel pads, wire brushes or scrapers.
Cleaning solutions need to be alkaline based or non-chloride cleaners. Any cleaner containing chlorides will damage the protective ﬁlm of the stainless steel. Chlorides are also commonly found in hard water, salts and household and industrial cleaners. If cleaners containing chlorides are used, be sure to rinse repeatedly and dry thoroughly upon completion.
Routine cleaning of stainless steel can be done with soap and water. Extreme stains or grease should be cleaned with a non-abrasive cleaner and plastic scrub pad. It is always good to rub with the grain of the steel. There are also stainless steel cleaners available which can restore and preserve the ﬁnish of the steels protective layer.
Early signs of stainless steel breakdown can consist of small pits and cracks. If this has begun, clean thoroughly and start to apply stainless steel cleaners in an attempt to restore the passivity of steel.

NEVER USE AN ACID BASED CLEANING SOLUTION! MANY FOOD PRODUCTS HAVE AN ACIDIC CONTENT WHICH CAN DETERIORATE THE FINISH. BE SURE TO CLEAN ALL FOOD PRODUCTS FROM ANY STAINLESS STEEL SURFACE. COMMON ITEMS INCLUDE, TOMATOES, PEPPERS AND OTHER VEGETABLES.

THE POWER MUST BE TURNED OFF AND DISCONNECTED
AT ALL TIMES WHEN PERFORMING MAINTENANCE OR REPAIR FUNCTIONS.

NEVER USE A HIGH-PRESSURE WATER WASH FOR THIS CLEANING PROCEDURE AS WATER CAN DAMAGE ELECTRICAL COMPONENTS

ELECTRICAL SHOCK HAZARD. DO NOT WASH WITH WATER JET OR HOSE.

RECOMMENDED SUPPLIES

Cleaning Towels
Non-Scratch Scrub Pad
KAY™ Degreaser
KAY® SINK SANITIZER, KAYQUAT™ Sanitizer, or compatible sanitizer

PROCEDURE

Turn unit off, unplug, and allow to cool for 30 minutes.
Remove all holding pans. Wash, rinse, and sanitize at the 3 compartment sink.
Allow to air dry.
Spray a cleaning towel, or non-scratch scrub pad when necessary, with soapy solution or KAY™ Degreaser. Fully clean upper heat sink surfaces by hand, as well as lower heat sink surfaces
Take care when reaching in the cabinet. Sheet metal edges could be sharp.
If daily cleaning is performed routinely, deeper, more aggressive, cleaning methods can be avoided. Over longer periods of time, fried food product can accumulate and bake on to the upper heat sink surfaces of the compartments.
Use a sanitizer-soaked towel and wipe out all compartments on the holding unit. Wipe top compartments first, and then lower compartments.

IMPORTANT: Use clean, sanitizer-soaked towels (Important: towels must be wrung out so that they are damp and not dripping, dripping towels may harm the unit.)

DAILY INSPECTION CHECKLIST:
Make sure that:

Unit is free of any visible food soils.
Unit is free of grease or soils in holding compartment.
Exterior of unit is free of smudges or soil.
Holding pans are free of any food soil residue.
Pans are free of damage such as cracks.

TEMPERATURE CHECK PROCEDURE

A digital temperature meter that has been calibrated must be used to get an accurate temperature reading. Use a thermocouple surface temperature probe to measure temperatures.
No pans, or product containers, should be in wells during the pre-heat and temperature check. Pre-heat the warmer for 30 minutes before taking any temperature readings. Do not take readings unless the cavity has been empty for 30 minutes. This will allow the temperature to stabilize and will prevent false readings.
The warmer cavity should be cleaned and empty before the temperature is checked. Avoid any air drafts that might flow through the cavity.
Temperature readings should be taken when standing on the front side of the unit with on/off switch. Locate the surface temperature probe on the bottom of the first cavity. Position the probe half way back on the heat sink and centered left to right as shown.
All temperature controls exhibit a swing in temperature as the control cycles on and off while regulating to the set point. The correct calibration temperature is the average of several readings taken over a period of 20 minutes after the warmer has been pre-heated. The average temperature should be no greater than ± 10°F (± 6°C) from the set point.
The allowable range of well temperatures which can be programmed on the RFHU is 140°F-280°F (60°C-137.8°C).
If the calibration temperature is greater than+/- 10F (6C) from the set point, adjust the temperature calibration offset value under
the Tools menu. The offset value should be set as the difference between the calibration temperature and the set point.
Repeat for all heat sinks.

Duke-RFHU-23R-2.5-Inch-Deep-Hot-Holding-Cabinet-27

RFHU SPECIFICATIONS

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ELECTRICAL SPECIFICATION/CORD RATING (TOP AND BOTTOM HEAT)

Model

(body only)

---|---|---|---|---|---
Amps| NEMA| Amps| IEC| in.| cm| in.| cm| in.| cm
RFHU 23R| 8.7/9.9| L6-15P| 9.1/9.9| 60309| 14.1| 35.8| 18.3| 44.4| 20.0| 50.8
RFHU 25S| 14.4/16.6| L6-20P| 15.3/16.6| 60309| 14.1| 35.8| 40.0| 101.6| 19.6| 49.8