Duke RUF-48 M User manual

This manual is Copyright © 2022 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
WARNING for CA residents: go to www.dukemfg.com/prop65 for prop 65 warning
Installation and
Operation Manual
48” REFRIGERATED COUNTER (RUF 48) DIGITAL
WITH 1/3 SIZE FOOD PAN INSERT
P/N 225409
REV B 05/25/2022
RUF 48 MOD

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Installation and Operation of: Product Name
IMPORTANT SAFETY INSTRUCTIONS
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.
TABLE OF CONTENTS
Inportant Safety Instructions......................................................................................................................... 2-3
Introduction ............................................................................................................................................................. 4
Specications........................................................................................................................................................... 5
Installation ................................................................................................................................................................ 6
Operation .................................................................................................................................................................. 7
Maintenance ............................................................................................................................................................ 8

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Installation and Operation of: Product Name
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.
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.

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Installation and Operation of: Product Name
CAUTION:OBSERVE THE FOLLOWING:
• Minimum clearances must be maintained from all walls and combustible materials.
• Keep the equipment area free and clear of combustible material.
• Adequate clearance for air openings.
• Unit exhausts air to the bottom and the rear.
• Do not set unit on a curb or seal to the wall.
• Do not block the slots in the front kickplate
• Operate equipment only on the type of electricity indicated on the specification plate.
• Top of unit weight load limit not to exceed 500 lbs.
• Do Not move unit with equipment loaded on top.
• Retain this manual for future reference.
This publication contains information regarding the
installation and operation of Duke Refrigerated
Counter units. The information contained within
applies to the models RUF 48. Please read this
manual completely before attempting to install and/
or operate this equipment.
Model number RUF 48 describes the 48” wide
counter length of the Refrigerated Counter.
(Fig. 1)
INTRODUCTION
SERIAL NUMBER
Always have the serial number of your unit available
when calling for parts or service. The serial
number can be found on the data plate inside the
refrigerated compartment.
RECEIVING &INSPECTING THE EQUIPMENT
Care should be taken during unloading so the
equipment is not damaged while being moved
into the building.
1. Visually inspect the exterior of the package
and skid or container. Any damage should be
noted and reported to the delivering carrier
immediately.
2. If damaged, open and inspect the contents with
the carrier.
3. In the event that the exterior is not damaged, yet
upon opening, there is concealed damage to the
equipment notify the carrier. Notification should
be made verbally as well as in written form.
4. Request an inspection by the shipping company
of the damaged equipment. This should be done
within 10 days from receipt of the equipment.
5. Check the lower portion of the unit to be sure
legs/casters are not bent.
6. Also view compressor compartment housing
and visually inspect the refrigeration package.
Be sure lines are secure and base is still intact.
7. Freight carriers can supply the necessary
damage forms upon request.
8. Retain all shipping material until an inspection
has been made or waived.
Figure. 1 RUF 48

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Installation and Operation of: Product Name
SPECIFICATIONS
Model Volts Frequency
(Hz) Amps Watts (Label) Refrigerant HEIGHT WIDTH LENGTH
RUF-48 M 120 60 4.2 N/A R-513A 40.00 In. 29.50 In. 48.18 In.
RUF-48 M 220 60 2.7 590 134A 40.00 In. 29.50 In. 48.18 In.
RUF-48 M 230 50 2.5 580 134A 40.00 In. 29.50 In. 48.18 In.
RUF-48 M 230 50 2.3 530 R290 40.00 In. 29.50 In. 48.18 In.

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Installation and Operation of: Product Name
INSTALLATION  Location
Units represented in this manual are intended for indoor use only. Be sure the location chosen has a floor or
counter strong enough to support the total weight of the units. Reinforce the floor or counter if necessary
to provide for maximum loading. For the most ecient operation, be sure to provide good air circulation
inside and out. These units should be located so that they can be moved for service. Major service to the
refrigeration system is done from the rear of the cabinet.
INSTALLATION – Inside Unit
Take care not to block air flow to the fans and allow space along the front, back and sides.
INSTALLATION – Outside Unit
Be sure that the unit has access to ample air; avoid hot corners and locations near stoves and ovens.
CAUTION:
This unit exhausts air to the bottom and the back. Do not seal the unit to the wall or set unit on a curb. The
ventilation slots in the kickplate must remain open.
INSTALLATION – Leveling
Be sure that the units are placed on a firm, flat surface/floor. Check for cracks in flooring or tile and avoid
these areas if possible. If necessary place support pads, properly rated for the weight of the unit, to “bridge”
uneven or cracked flooring. Level unit accordingly.
INSTALLATION – Stabilizing
Make sure the unit is installed on a at surface to insure that the unit is solid to the floor at all four contact
points. Insure that the unit does not“rock” when pressure is applied to the top corners.
INSTALLATION – Electrical Wiring
The RUF 48 is available as a 120VAC, 60 Hz or as 230VAC, 50 Hz dependent on model. All electrical
connections should be performed by a certified electrician and should comply with local electrical codes for
your municipality.
REFER TO THE AMPERAGE DATA LIST IN THE SPECIFICATIONS OR THE SERIAL TAG DATA AND YOUR
LOCAL CODE OR THE NATIONAL ELECTRICAL CODE TO BE SURE UNIT IS CONNECTED TO THE PROPER
POWER SOURCE. A PROTECTED CIRCUIT OF THE CORRECT VOLTAGE AND AMPERAGE MUST BE RUN
FOR CONNECTION OF THE SUPPLY CORD OR PERMANENT CONNECTION TO THE UNIT. THE POWER
MUST BE TURNED OFF AND DISCONNECTED WHENEVER PERFORM¬ING MAINTENANCE OR REPAIR
FUNCTIONS.

7
Installation and Operation of: Product Name
OPERATION
OPERATION – Location of Controls
The refrigeration control/temperature setting adjustment is located on the back splash. This is the only user
adjustable component on the unit. The refrigeration control / temperature display is covered by a protective
cover to prevent unauthorized changes. To access the control buttons, remove the cover fasteners with a
phillips screwdriver.
OPERATION – Operating Procedure
Press and hold the (i) button to display setpoint. Keep (i) button pressed and use the up/down arrows to
adjust setpoint. When the (i) button is released, the new setpoint is stored. To exit from the setup, press the
power button or wait 30 seconds. Display will display“dEF” while unit is in defrost mode. Check the cooling
specifications required for the products/goods to be stored.
Refrigeration control / Temperature display
Use a simple thermometer to set to a specific temperature. Allow time for temperature chang-es before
making a final temperature check.

8
Installation and Operation of: Product Name
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.
MAINTENANCE
MAINTENANCE – Stainless Steel Care & Cleaning
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 steels 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 stain¬less 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 be¬gun, clean
thoroughly and start to apply stain¬less steel cleaners in attempt to restore the passivity of steel.
CAUTION

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Installation and Operation of: Product Name
MAINTENANCE
MAINTENANCE – Cleaning the Condenser Coil
The condenser coil is located behind the unit. This unit has a replaceable lter, discard old lters. The con-
denser coil requires regular cleaning and is recommended every 60 days. However, in some instances you
may find that there is a large amount of debris, dust or grease that has accumulated prior to the 60 day time
frame. In these cases the condenser coil should be cleaned every 30 days.
Filter (Condensing Coil is
Located behind unit.)
MAINTENANCE – Cleaning the Condenser Coil – cont.
If the build up on the coil consists of only light dust and debris the condenser coil can be cleaned with a sim-
ple brush, heavier dust build up may require a vacuum or even compressed air to blow through the conden-
sor coil.
If heavy grease is present degreasing agents are available for refrigeration use and specifically for the con-
denser coils. The condenser coil may require a spray with the degreasing agent and then blown through
with compressed air.
Failure to maintain a clean condenser coil can initially cause high temperatures and exces¬sive run times.
Continuous operation with dirty or clogged condenser coils can result in compressor failures. Neglecting
the condenser coil cleaning procedures will void any warran¬ties associated with the compressor or cost to
replace the compressor.
NEVER USE A HIGH-PRESSURE WATER WASH FOR THIS CLEANING PROCEDURE AS WATER CAN
DAMAGE ELECTRICAL COMPONENTS LOCATED NEAR OR AT THE CONDENSER COIL.
CAUTION

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Installation and Operation of: Product Name
MAINTENANCE
MAINTENANCE – Door Gasket Care
Gaskets require regular cleaning to prevent mold and mildew build up and also to keep the elasticity of the
gasket. Gasket cleaning can be done with the use of warm soapy water. Avoid full strength cleaning prod-
ucts on gaskets as this can cause them to become brittle and prevent proper seals. Also, never use sharp
tools or knives to scrape or clean the gasket which could possibly tear the gasket and rip the bellows.
Gaskets can easily be replaced and do not require the use of tools or authorized service persons. The gaskets
are “Dart” style and can be pulled out of the grove in the door and new gaskets can be“pressed” back into
place.
MAINTENANCE – Drain
Each unit has a drain tube located in the rear the unit which removes condensation from the evaporator coil
and deposits it onto a drain pan where it can evaporate. If you notice excessive water accumulation on the
inside of the unit be sure that the drain tube is connected from the evaporator hous¬ing to the condensate
evaporator drain pan. If water is collecting underneath the unit you may want to check the condensate
evaporator drain tube to be sure it is still located above the drain pan. The leveling of the unit is also import-
ant as the units are designed to drain properly when on a level surface, if your floor is not level this can also
cause drain problems. Be sure the drain pan is kept free of dirt, dust and other debris as excessive amounts
will cause water to back up and overflow from the drain pan.
MAINTENANCE – Drain Pan Access
The drain pan and drain tube can be accessed from the rear of the unit. Pull the unit away from wall to ex-
pose the rear of the cabinet. The drain pan is located on the left/rear of the unit.

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Installation and Operation of: Product Name
MAINTENANCE
MAINTENANCE – Food Pan Insert & Air Duct
The food pan insert in the top has a removable liner that can be lifted from the top and washed separately.
Inside the unit, under the food pan insert, is a removable duct box and duct cover that can be removed by
unscrewing the thumbscrews that hold them in place. These should be periodically removed and cleaned.
With the cover removed, the inside of the air duct can be wiped clean if needed.
1/3 Food Pan w/ Lid
Removable Liner
Removable Duct Box
Removable Duct Cover
Unit shown without doors for clarity

Installation and Operation of: Product Name
Duke Manufacturing Co.
2305 N. Broadway
St. Louis, MO 63102
Phone: [phone]
Toll Free: 1-800-735-3853
Fax: [phone] www.dukemfg.com
NOTES